diff --git a/.github/ISSUE_TEMPLATE/language-service.md b/.github/ISSUE_TEMPLATE/language-service.md
index 737b9daaa4..15438555fe 100644
--- a/.github/ISSUE_TEMPLATE/language-service.md
+++ b/.github/ISSUE_TEMPLATE/language-service.md
@@ -34,6 +34,6 @@ about: 'Issues pertaining to IntelliSense, autocomplete, code editing, etc. '
 
 **Additional context**
 <!--
-*Call Stacks: For bugs like crashes, deadlocks, infinite loops, etc. that we are not able to repro and for which the call stack may be useful, please attach a debugger and/or create a dmp and provide the call stacks. Starting with 0.17.3, Windows binaries have symbols available in VS Code by setting your "symbolSearchPath" to "http://msdl.microsoft.com/download/symbols".*
-Add any other context about the problem here including log messages in your Output window ("C_Cpp.loggingLevel": "Debug" in settings.json).
+* Call Stacks: For bugs like crashes, deadlocks, infinite loops, etc. that we are not able to repro and for which the call stack may be useful, please attach a debugger and/or create a dmp and provide the call stacks. Windows binaries have symbols available in VS Code by setting your "symbolSearchPath" to "https://msdl.microsoft.com/download/symbols".
+* Add any other context about the problem here including log messages in your Output window ("C_Cpp.loggingLevel": "Debug" in settings.json).
 -->
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index 0fa3788981..0000000000
--- a/.travis.yml
+++ /dev/null
@@ -1,43 +0,0 @@
-language: node_js
-
-node_js:
-- "8"
-
-before_install:
-  # Do not modify. Required for GUI based tests: See https://docs.travis-ci.com/user/gui-and-headless-browsers/#Using-xvfb-to-Run-Tests-That-Require-a-GUI
-  - if [ $TRAVIS_OS_NAME == "linux" ]; then
-      export CXX="g++-4.9" CC="gcc-4.9" DISPLAY=:99.0;
-      sh -e /etc/init.d/xvfb start;
-      sleep 3;
-    fi
-
-addons:
-  apt:
-    sources:
-      - ubuntu-toolchain-r-test
-      - sourceline: 'deb https://packages.microsoft.com/repos/microsoft-ubuntu-trusty-prod trusty main'
-        key_url: 'https://packages.microsoft.com/keys/microsoft.asc'
-    packages:
-      - gdb
-      - g++-4.9
-
-
-script:
-  # Download debugAdapters from an existing extension version. See TravisCI settings to set CPPTOOL_VERSION
-  - mkdir -p ~/.vscode/extensions/ms-vscode.cpptools-$CPPTOOL_VERSION
-  - wget https://github.com/Microsoft/vscode-cpptools/releases/download/$CPPTOOL_VERSION/cpptools.vsix -O ~/cpptools.vsix
-  - unzip ~/cpptools.vsix "extension/debugAdapters/*" -d ~/.
-  - mv ~/extension/debugAdapters ~/.vscode/extensions/ms-vscode.cpptools-$CPPTOOL_VERSION/debugAdapters
-  # Build and then run tests
-  - cd Extension
-  - npm install
-  - npm run compile
-  - npm run tslint
-  # pr-check needs to run before test. test modifies package.json.
-  - npm run pr-check
-  - npm run unitTests
-  # TODO: Merge tests into one group due to Gulp 4.0
-  - npm run integrationTests
-  # Dump integrationTest.log output
-  - find ~ -name "integrationTests.log" -type f -exec cat {} \;
-  
\ No newline at end of file
diff --git a/Extension/CHANGELOG.md b/Extension/CHANGELOG.md
index c479629532..41065333f2 100644
--- a/Extension/CHANGELOG.md
+++ b/Extension/CHANGELOG.md
@@ -1,6 +1,42 @@
 # C/C++ for Visual Studio Code Change Log
 
-## Version 0.21.0 January 23, 2019
+## Version 0.22.0: March 19, 2019
+### Major Changes
+* Add warning squiggles for invalid properties and paths in `c_cpp_properties.json`. [#2799](https://github.com/Microsoft/vscode-cpptools/issues/2799), [PR #3283](https://github.com/Microsoft/vscode-cpptools/pull/3283)
+* Add C/C++ compiler build tasks for compiling the active source file, with support for `F5` debugging and the `Build and Debug Active File` context menu command. [PR #3118](https://github.com/Microsoft/vscode-cpptools/pull/3118), [PR #3244](https://github.com/Microsoft/vscode-cpptools/pull/3244)
+* Add AutoPCH support to reduce IntelliSense parsing time, with `C_Cpp.intelliSenseCachePath` and `C_Cpp.intelliSenseCacheSize` settings. It isn't enabled for Mac yet. [PR #3184](https://github.com/Microsoft/vscode-cpptools/pull/3184)
+
+### Minor Changes
+* Fix IntelliSense not working on Windows when the username has a space in it and file `C:\Users\<firstname>` exists. [#1377](https://github.com/Microsoft/vscode-cpptools/issues/1377), [#2114](https://github.com/Microsoft/vscode-cpptools/issues/2114), [#2176](https://github.com/Microsoft/vscode-cpptools/issues/2176), [#3052](https://github.com/Microsoft/vscode-cpptools/issues/3052), [#3139](https://github.com/Microsoft/vscode-cpptools/issues/3139)
+* Enable `${command:cpptools.activeConfigName}` in tasks. [#1524](https://github.com/Microsoft/vscode-cpptools/issues/1524)
+* Fix bugs with squiggles and IntelliSense updating after edits. [#1779](https://github.com/Microsoft/vscode-cpptools/issues/1779), [#3124](https://github.com/Microsoft/vscode-cpptools/issues/3124), [#3260](https://github.com/Microsoft/vscode-cpptools/issues/3260)
+* Fix formatting (and other non-IntelliSense operations) being blocked by IntelliSense processing. [#1928](https://github.com/Microsoft/vscode-cpptools/issues/1928)
+* Fix completion when the start of an identifier matches a keyword. [#1986](https://github.com/Microsoft/vscode-cpptools/issues/1986)
+* Fix auto-removal of compiler-provided paths in `includePath`. [#2177](https://github.com/Microsoft/vscode-cpptools/issues/2177)
+* Fix crash on Windows when 8.3 filenames are used. [#2453](https://github.com/Microsoft/vscode-cpptools/issues/2453), [#3104](https://github.com/Microsoft/vscode-cpptools/issues/3104)
+* Add support for `Scope::Member` scoped symbol searches. [#2484](https://github.com/Microsoft/vscode-cpptools/issues/2484)
+* Fix signature help active parameter selection when parameter names are missing or subsets of each other. [#2952](https://github.com/Microsoft/vscode-cpptools/issues/2952)
+* Fix `--enable-pretty-printing` with `gdb` when complex objects are used as keys in maps. [#3024](https://github.com/Microsoft/vscode-cpptools/issues/3024)
+* Fix IntelliSense-based `Go to Definition` for `noexcept` methods. [#3060](https://github.com/Microsoft/vscode-cpptools/issues/3060)
+* Render macro hover expansions as C/C++. [#3075](https://github.com/Microsoft/vscode-cpptools/issues/3075)
+* Enable completion after `struct` when manually invoked. [#3080](https://github.com/Microsoft/vscode-cpptools/issues/3080)
+* Add `C_Cpp.suggestSnippets` setting to disable language server snippets. [#3083](https://github.com/Microsoft/vscode-cpptools/issues/3083)
+* Show a prompt for changing `C_Cpp.updateChannel` to `Insiders`. [#3089](https://github.com/Microsoft/vscode-cpptools/issues/3089)
+  * lh123 (@lh123) [PR #3221](https://github.com/Microsoft/vscode-cpptools/pull/3221)
+* Fix `compilerPath` not getting priority over the `compile_commands.json` compiler. [#3102](https://github.com/Microsoft/vscode-cpptools/issues/3102)
+* Fix Linux `compile_commands.json` compiler querying with relative paths. [#3112](https://github.com/Microsoft/vscode-cpptools/issues/3112)
+* Allow `*` in `includePath` to apply to `browse.path` when `browse.path` is not specified. [#3121](https://github.com/Microsoft/vscode-cpptools/issues/3121)
+  * Tucker Kern (@mill1000) [PR #3122](https://github.com/Microsoft/vscode-cpptools/pull/3122)
+* Disable `(` and `<` completion commit characters. [#3127](https://github.com/Microsoft/vscode-cpptools/issues/3127)
+* Add Chinese translations for command titles. [PR #3128](https://github.com/Microsoft/vscode-cpptools/pull/3128)
+* Fix remote process picker bug. [#2585](https://github.com/Microsoft/vscode-cpptools/issues/2585), [#3150](https://github.com/Microsoft/vscode-cpptools/issues/3150)
+* Fix command not found and empty `c_cpp_properties.json` if activation is too slow. [#3160](https://github.com/Microsoft/vscode-cpptools/issues/3160), [#3176](https://github.com/Microsoft/vscode-cpptools/issues/3176)
+* Fix `cppvsdbg` debugger showing `"An unspecified error has occurred."` for structured binding variables. [#3197](https://github.com/Microsoft/vscode-cpptools/issues/3197)
+* Fix bugs with the Insider reload prompt appearing when it shouldn't. [#3206](https://github.com/Microsoft/vscode-cpptools/issues/3206)
+* Fix variable expansion (e.g. `${env.HOME}`) not working when `${default}` is used in `c_cpp_properties.json`. [#3309](https://github.com/Microsoft/vscode-cpptools/issues/3309)
+* Fix other unreported IntelliSense engine bugs.
+
+## Version 0.21.0: January 23, 2019
 ### New Features
 * Add documentation comments for hover, completion, and signature help. [#399](https://github.com/Microsoft/vscode-cpptools/issues/399)
 * Add completion committing for methods after `(`. [#1184](https://github.com/Microsoft/vscode-cpptools/issues/1184)
diff --git a/Extension/README.md b/Extension/README.md
index b8be24a4f1..c3ec6c28f1 100644
--- a/Extension/README.md
+++ b/Extension/README.md
@@ -23,5 +23,12 @@ This preview release of the extension adds language support for C/C++ to Visual
 
 You can find more detailed information about C/C++ support for Visual Studio Code at our [GitHub page](https://github.com/Microsoft/vscode-cpptools/tree/master/Documentation) and our [VS Code documentation page](https://code.visualstudio.com/docs/languages/cpp).
 
+## Installation
+The extension has OS-specific binary dependencies, so installation via the Marketplace requires an Internet connection so that these additional dependencies can be downloaded. If you are working on a computer that does not have access to the Internet or is behind a strict firewall, you may need to use our OS-specific packages and install them by invoking VS Code's `"Install from VSIX..."` command. These "offline' packages are available at: https://github.com/Microsoft/vscode-cpptools/releases.
+* `cpptools-linux.vsix` - for 64-bit Linux
+* `cpptools-linux32.vsix` - for 32-bit Linux
+* `cpptools-osx.vsix` - for macOS
+* `cpptools-win32.vsix` - for 64-bit & 32-bit Windows
+
 ## Contact Us
-If you run into any issues or have suggestions for us, please file [issues and suggestions on GitHub](https://github.com/Microsoft/vscode-cpptools/issues). If you haven’t already provided us feedback, please take this [quick survey](https://www.research.net/r/VBVV6C6) to help shape this extension for your needs.
+If you run into any issues or have suggestions for us, please file [issues and suggestions on GitHub](https://github.com/Microsoft/vscode-cpptools/issues). If you haven’t already provided us feedback, please take this [quick survey](https://www.research.net/r/VBVV6C6) and let us know what you think!
diff --git a/Extension/ReleaseNotes.html b/Extension/ReleaseNotes.html
index 8eaca692d6..e6156f2c04 100644
--- a/Extension/ReleaseNotes.html
+++ b/Extension/ReleaseNotes.html
@@ -205,8 +205,23 @@ <h1>Microsoft C/C++ Extension for VS Code</h1>
                         <tr>
                             <td>
                                 <div>
-                                    <h2 class="caption">January 2019 Update</h2>
-                                    <div>Thank you for installing the C/C++ extension. In the January update, we added documentation comments for hover, completion, and signature help.<br/>
+                                    <h2 class="caption">March 2019 Update</h2>
+                                    <div>Thank you for installing the C/C++ extension! We're excited to announce the following features in the March update:<br/>
+                                        <h3 style="font-weight: 600">IntelliSense caching</h3>
+                                        On Windows and Linux, the extension will now cache header information to improve IntelliSense speed for your code files. Support for macOS will be available in a future release.<br/>
+                                        <br/>
+                                        <em style="font-weight: 600">Please Note:</em> The extension writes the cache to disk in order to achieve this performance improvement. By default the cache files will be stored in your workspace
+                                        folder's ".vscode" folder, but you can change this location by using the <code>"C_Cpp.intelliSenseCachePath"</code> setting. You can also control how much disk space can be
+                                        used for the cache with the <code>"C_Cpp.intelliSenseCacheSize"</code> setting. The default is 5120 MB as the caches for individual translation units can be large,
+                                        depending on the size and number of included headers.<br/>
+                                        <h3 style="font-weight: 600">Build and debug the active source file</h3>
+                                        We added a command to help you generate build and debug tasks for single code files. Since this feature writes out tasks.json and launch.json files, it currently requires
+                                        that a workspace folder be opened in VS Code first. After that, you can press F5 or select the command from the context menu to configure the tasks or kick off a build and debug
+                                        session.<br/>
+                                        <h3 style="font-weight: 600">Configuration squiggles</h3>
+                                        We added additional validation to the <code>c_cpp_properties.json</code> file to assist in diagnosing potential configuration mistakes. They will show up as problems in the
+                                        problems window.<br/>
+                                        <br/>
                                         <br/>
                                         Additional features and bug fixes are detailed in the <a href="https://github.com/Microsoft/vscode-cpptools/releases">full release notes</a>.</div>
                                 </div>
@@ -231,10 +246,9 @@ <h3 class="caption">Getting Started</h3>
                             <td>
                                 <div>
                                     <h3 class="caption">Blog Posts</h3>
-                                    <div><a href="https://blogs.msdn.microsoft.com/vcblog/2018/12/05/visual-studio-code-cpp-extension-october-2018-update-and-a-simplified-insiders-program/">October 2018 Update</a></div>
-                                    <div><a href="https://blogs.msdn.microsoft.com/vcblog/2018/08/23/visual-studio-code-c-c-extension-august-2018-update/">August 2018 Update</a></div>
-                                    <div><a href="https://blogs.msdn.microsoft.com/vcblog/2018/07/25/visual-studio-code-cc-extension-july-2018-update-and-intellisense-auto-configuration-for-cmake/">July 2018 Update</a></div>
-                                    <div><a href="https://blogs.msdn.microsoft.com/vcblog/2016/03/31/cc-extension-for-visual-studio-code/">C/C++ Extension anouncement</a></div>
+                                    <div><a href="https://devblogs.microsoft.com/cppblog/vs-code-cpp-extension-january-2019-update/">January 2019 Update</a></div>
+                                    <div><a href="https://devblogs.microsoft.com/cppblog/visual-studio-code-cpp-extension-october-2018-update-and-a-simplified-insiders-program/">October 2018 Update</a></div>
+                                    <div><a href="https://devblogs.microsoft.com/cppblog/visual-studio-code-c-c-extension-august-2018-update/">August 2018 Update</a></div>
                                 </div>
                             </td>
                         </tr>
diff --git a/Extension/c_cpp_properties.schema.json b/Extension/c_cpp_properties.schema.json
index 2e7a7ad00f..d10e750cdf 100644
--- a/Extension/c_cpp_properties.schema.json
+++ b/Extension/c_cpp_properties.schema.json
@@ -112,9 +112,11 @@
                                     "type": "string"
                                 }
                             }
-                        }
+                        },
+                        "additionalProperties": false
                     }
-                }
+                },
+                "additionalProperties": false
             }
         },
         "env": {
@@ -156,5 +158,6 @@
     "required": [
         "configurations",
         "version"
-    ]
+    ],
+    "additionalProperties": false
 }
diff --git a/Extension/jobs/build.windows.yml b/Extension/jobs/build.windows.yml
new file mode 100644
index 0000000000..662c72a11c
--- /dev/null
+++ b/Extension/jobs/build.windows.yml
@@ -0,0 +1,58 @@
+parameters:
+  name: ''
+  pool: ''
+
+jobs:
+- job: Windows
+  pool:
+    vmImage: 'vs2017-win2016'
+
+  steps:
+  - task: NodeTool@0
+    displayName: 'Use Node 8.x'
+    inputs:
+      versionSpec: 8.x
+
+  - script: npm install
+    displayName: "Install Dependencies"
+    workingDirectory: '$(Build.SourcesDirectory)\Extension'
+      
+  - script: npm run compile
+    displayName: "Compile Sources"
+    workingDirectory: '$(Build.SourcesDirectory)\Extension'
+
+  - script: npm run pr-check
+    displayName: 'Validate Extension/package.json'
+    workingDirectory: '$(Build.SourcesDirectory)\Extension'
+
+  - script: npm run tslint
+    displayName: 'Run Linter'
+    workingDirectory: '$(Build.SourcesDirectory)\Extension'
+
+  - script: 'npm run unitTests'
+    displayName: 'Run unit tests'
+    workingDirectory: '$(Build.SourcesDirectory)\Extension'
+    continueOnError: true
+
+  - script: 'copy "$(Build.SourcesDirectory)\Extension\out\test\integrationTests\MockDebugger\debugAdapterDescriptorFactory.js" "$(Build.SourcesDirectory)\Extension\out\src\Debugger\debugAdapterDescriptorFactory.js" /Y'
+    displayName: Replace Debug Adapter Descriptor Factory
+
+  - script: 'node node_modules/vscode/bin/test'
+    displayName: 'Run debug integration tests'
+    workingDirectory: '$(Build.SourcesDirectory)\Extension'
+    continueOnError: true
+    env:
+      CODE_TESTS_PATH: '$(Build.SourcesDirectory)\Extension\out\test\integrationTests\debug'
+      CODE_EXTENSIONS_PATH: '$(Build.SourcesDirectory)\Extension'
+      CODE_TESTS_WORKSPACE: '$(Build.SourcesDirectory)\Extension\test\integrationTests\testAssets\SimpleCppProject'
+      CODE_DISABLE_EXTENSIONS: 1
+
+  - script: 'node node_modules/vscode/bin/test'
+    displayName: 'Run languageServer integration tests'
+    workingDirectory: '$(Build.SourcesDirectory)\Extension'
+    continueOnError: true
+    env:
+      CODE_TESTS_PATH: '$(Build.SourcesDirectory)\Extension\out\test\integrationTests\languageServer'
+      CODE_EXTENSIONS_PATH: '$(Build.SourcesDirectory)\Extension'
+      CODE_TESTS_WORKSPACE: '$(Build.SourcesDirectory)\Extension\test\integrationTests\testAssets\SimpleCppProject'
+      CODE_DISABLE_EXTENSIONS: 1
\ No newline at end of file
diff --git a/Extension/jobs/build.yml b/Extension/jobs/build.yml
new file mode 100644
index 0000000000..905777acbe
--- /dev/null
+++ b/Extension/jobs/build.yml
@@ -0,0 +1,67 @@
+parameters:
+  name: ''
+  pool: ''
+
+jobs:
+- job: ${{ parameters.name }}
+  pool: ${{ parameters.pool }}
+
+  steps:
+  - task: NodeTool@0
+    displayName: 'Use Node 8.x'
+    inputs:
+      versionSpec: 8.x
+
+  - script: npm install
+    displayName: "Install Dependencies"
+    workingDirectory: '$(Build.SourcesDirectory)/Extension'
+      
+  - script: npm run compile
+    displayName: "Compile Sources"
+    workingDirectory: '$(Build.SourcesDirectory)/Extension'
+
+  - script: npm run pr-check
+    displayName: 'Validate Extension/package.json'
+    workingDirectory: '$(Build.SourcesDirectory)/Extension'
+
+  - script: npm run tslint
+    displayName: 'Run Linter'
+    workingDirectory: '$(Build.SourcesDirectory)/Extension'
+
+  - script: 'npm run unitTests'
+    displayName: 'Run unit tests'
+    workingDirectory: '$(Build.SourcesDirectory)/Extension'
+    continueOnError: true
+
+  - script: |
+      set -e
+      /usr/bin/Xvfb :10 -ac >> /tmp/Xvfb.out 2>&1 &
+      disown -ar
+    displayName: 'Start xvfb'
+
+  - script: |
+      cp $(Build.SourcesDirectory)/Extension/out/test/integrationTests/MockDebugger/debugAdapterDescriptorFactory.js $(Build.SourcesDirectory)/Extension/out/src/Debugger/debugAdapterDescriptorFactory.js
+    displayName: Replace Debug Adapter Descriptor Factory
+
+  - script: 'node node_modules/vscode/bin/test'
+    displayName: 'Run debug integration tests'
+    workingDirectory: '$(Build.SourcesDirectory)/Extension'
+    continueOnError: true
+    env:
+      MOCK_DEBUG: 1
+      DISPLAY: :10
+      CODE_TESTS_PATH: '$(Build.SourcesDirectory)/Extension/out/test/integrationTests/debug'
+      CODE_EXTENSIONS_PATH: '$(Build.SourcesDirectory)/Extension'
+      CODE_TESTS_WORKSPACE: '$(Build.SourcesDirectory)/Extension/test/integrationTests/testAssets/SimpleCppProject'
+      CODE_DISABLE_EXTENSIONS: 1
+
+  - script: 'node node_modules/vscode/bin/test'
+    displayName: 'Run languageServer integration tests'
+    workingDirectory: '$(Build.SourcesDirectory)/Extension'
+    continueOnError: true
+    env:
+      DISPLAY: :10
+      CODE_TESTS_PATH: '$(Build.SourcesDirectory)/Extension/out/test/integrationTests/languageServer'
+      CODE_EXTENSIONS_PATH: '$(Build.SourcesDirectory)/Extension'
+      CODE_TESTS_WORKSPACE: '$(Build.SourcesDirectory)/Extension/test/integrationTests/testAssets/SimpleCppProject'
+      CODE_DISABLE_EXTENSIONS: 1
\ No newline at end of file
diff --git a/Extension/package-lock.json b/Extension/package-lock.json
index ba61a2dcbf..ef8d950965 100644
--- a/Extension/package-lock.json
+++ b/Extension/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "cpptools",
-  "version": "0.21.0",
+  "version": "0.22.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -10,18 +10,15 @@
       "integrity": "sha512-tHq6qdbT9U1IRSGf14CL0pUlULksvY9OZ+5eEgl1N7t+OA3tGvNpxJCzuKQlsNgCVwbAs670L1vcVQi8j9HjnA=="
     },
     "@types/mocha": {
-      "version": "2.2.45",
-      "resolved": "https://registry.npmjs.org/@types/mocha/-/mocha-2.2.45.tgz",
-      "integrity": "sha512-tE1SYtNG3I3atRVPELSGN2FJJJtPg3O/G0tycYSyzeDqdAbdLPRH089LhpWYA5M/iHeWHkVZq/b0OVKngcK0Eg==",
-      "dev": true,
-      "requires": {
-        "@types/node": "*"
-      }
+      "version": "5.2.6",
+      "resolved": "https://registry.npmjs.org/@types/mocha/-/mocha-5.2.6.tgz",
+      "integrity": "sha512-1axi39YdtBI7z957vdqXI4Ac25e7YihYQtJa+Clnxg1zTJEaIRbndt71O3sP4GAMgiAm0pY26/b9BrY4MR/PMw==",
+      "dev": true
     },
     "@types/node": {
-      "version": "8.5.4",
-      "resolved": "https://registry.npmjs.org/@types/node/-/node-8.5.4.tgz",
-      "integrity": "sha512-iSJdm5S6Vhk+Ep38gwxie/5T7+MSip6bu30LsE5VylRKTMxXrvVJGqdxJLs8hsviLqjlCx9o3uRXDkJ+/K0DsQ==",
+      "version": "8.10.43",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-8.10.43.tgz",
+      "integrity": "sha512-5m5W13HR2k3cu88mpzlnPBBv5+GyMHtj4F0P83RG4mqoC0AYVYHVMHfF3SgwKNtqEZiZQASMxU92QsLEekKcnw==",
       "dev": true
     },
     "agent-base": {
@@ -33,15 +30,15 @@
       }
     },
     "ajv": {
-      "version": "5.5.2",
-      "resolved": "https://registry.npmjs.org/ajv/-/ajv-5.5.2.tgz",
-      "integrity": "sha1-c7Xuyj+rZT49P5Qis0GtQiBdyWU=",
+      "version": "6.9.2",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.9.2.tgz",
+      "integrity": "sha512-4UFy0/LgDo7Oa/+wOAlj44tp9K78u38E5/359eSrqEp1Z5PdVfimCcs7SluXMP755RUQu6d2b4AvF0R1C9RZjg==",
       "dev": true,
       "requires": {
-        "co": "^4.6.0",
-        "fast-deep-equal": "^1.0.0",
+        "fast-deep-equal": "^2.0.1",
         "fast-json-stable-stringify": "^2.0.0",
-        "json-schema-traverse": "^0.3.0"
+        "json-schema-traverse": "^0.4.1",
+        "uri-js": "^4.2.2"
       }
     },
     "ansi-colors": {
@@ -106,303 +103,6 @@
       "requires": {
         "micromatch": "^3.1.4",
         "normalize-path": "^2.1.1"
-      },
-      "dependencies": {
-        "arr-diff": {
-          "version": "4.0.0",
-          "resolved": "https://registry.npmjs.org/arr-diff/-/arr-diff-4.0.0.tgz",
-          "integrity": "sha1-1kYQdP6/7HHn4VI1dhoyml3HxSA=",
-          "dev": true
-        },
-        "array-unique": {
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@@ -6858,9 +5259,9 @@
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@@ -6872,12 +5273,6 @@
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@@ -6916,51 +5311,54 @@
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-      "integrity": "sha1-vm/zJwy1Xf19MGNkDegfJddTIjk=",
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/vinyl-fs/-/vinyl-fs-3.0.3.tgz",
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-        "glob-stream": "^5.3.2",
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+        "glob-stream": "^6.1.0",
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-        "merge-stream": "^1.0.0",
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-        "readable-stream": "^2.0.4",
-        "strip-bom": "^2.0.0",
-        "strip-bom-stream": "^1.0.0",
+        "lead": "^1.0.0",
+        "object.assign": "^4.0.4",
+        "pumpify": "^1.3.5",
+        "readable-stream": "^2.3.3",
+        "remove-bom-buffer": "^3.0.0",
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-        "vali-date": "^1.0.0",
-        "vinyl": "^1.0.0"
+        "to-through": "^2.0.0",
+        "value-or-function": "^3.0.0",
+        "vinyl": "^2.0.0",
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-          "resolved": "https://registry.npmjs.org/clone/-/clone-1.0.4.tgz",
-          "integrity": "sha1-2jCcwmPfFZlMaIypAheco8fNfH4=",
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-          "integrity": "sha1-KbvZIHinOfC8zitO5B6DeVNSKSQ=",
+        "clone-stats": {
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+          "integrity": "sha1-s3gt/4u1R04Yuba/D9/ngvh3doA=",
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-          "integrity": "sha1-XIgDbPVl5d8FVYv8kR+GVt8hiIQ=",
+          "version": "2.2.0",
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-            "clone": "^1.0.0",
-            "clone-stats": "^0.0.1",
-            "replace-ext": "0.0.1"
+            "clone": "^2.1.1",
+            "clone-buffer": "^1.0.0",
+            "clone-stats": "^1.0.0",
+            "cloneable-readable": "^1.0.0",
+            "remove-trailing-separator": "^1.0.1",
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@@ -7019,34 +5417,60 @@
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-      "dev": true,
-      "requires": {
-        "tslint": "~5.8.0"
-      }
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+      "dev": true
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-      "resolved": "https://registry.npmjs.org/vscode/-/vscode-1.1.18.tgz",
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+      "version": "1.1.30",
+      "resolved": "https://registry.npmjs.org/vscode/-/vscode-1.1.30.tgz",
+      "integrity": "sha512-YDj5w0TGOcS8XLIdekT4q6LlLV6hv1ZvuT2aGT3KJll4gMz6dUPDgo2VVAf0i0E8igbbZthwvmaUGRwW9yPIaw==",
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         "gulp-gunzip": "1.0.0",
-        "gulp-remote-src-vscode": "^0.5.0",
-        "gulp-symdest": "^1.1.0",
+        "gulp-remote-src-vscode": "^0.5.1",
         "gulp-untar": "^0.0.7",
-        "gulp-vinyl-zip": "^2.1.0",
+        "gulp-vinyl-zip": "^2.1.2",
         "mocha": "^4.0.1",
-        "request": "^2.83.0",
+        "request": "^2.88.0",
         "semver": "^5.4.1",
         "source-map-support": "^0.5.0",
-        "url-parse": "^1.1.9",
+        "url-parse": "^1.4.3",
+        "vinyl-fs": "^3.0.3",
         "vinyl-source-stream": "^1.1.0"
+      },
+      "dependencies": {
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+          "version": "3.1.0",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-3.1.0.tgz",
+          "integrity": "sha512-OX8XqP7/1a9cqkxYw2yXss15f26NKWBpDXQd0/uK/KPqdQhxbPa994hnzjcE2VqQpDslf55723cKPUOGSmMY3g==",
+          "dev": true,
+          "requires": {
+            "ms": "2.0.0"
+          }
+        },
+        "mocha": {
+          "version": "4.1.0",
+          "resolved": "https://registry.npmjs.org/mocha/-/mocha-4.1.0.tgz",
+          "integrity": "sha512-0RVnjg1HJsXY2YFDoTNzcc1NKhYuXKRrBAG2gDygmJJA136Cs2QlRliZG1mA0ap7cuaT30mw16luAeln+4RiNA==",
+          "dev": true,
+          "requires": {
+            "browser-stdout": "1.3.0",
+            "commander": "2.11.0",
+            "debug": "3.1.0",
+            "diff": "3.3.1",
+            "escape-string-regexp": "1.0.5",
+            "glob": "7.1.2",
+            "growl": "1.10.3",
+            "he": "1.1.1",
+            "mkdirp": "0.5.1",
+            "supports-color": "4.4.0"
+          }
+        }
       }
     },
     "vscode-cpptools": {
@@ -7055,24 +5479,25 @@
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-      "version": "1.24.0",
-      "resolved": "https://registry.npmjs.org/vscode-debugadapter/-/vscode-debugadapter-1.24.0.tgz",
-      "integrity": "sha1-KAY7AcyorB5fehPRGOMgem6If/0=",
+      "version": "1.33.0",
+      "resolved": "https://registry.npmjs.org/vscode-debugadapter/-/vscode-debugadapter-1.33.0.tgz",
+      "integrity": "sha512-GsSD6PyVokjyW+7LU3FRXbu8SINv9muQtMQEDvwB6SIGQfrQzld8kECpQRr71j3mgXW+sTY+44/XMzueeaU6/Q==",
       "requires": {
-        "vscode-debugprotocol": "^1.24.0"
+        "mkdirp": "^0.5.1",
+        "vscode-debugprotocol": "1.33.0"
       }
     },
     "vscode-debugprotocol": {
-      "version": "1.24.0",
-      "resolved": "https://registry.npmjs.org/vscode-debugprotocol/-/vscode-debugprotocol-1.24.0.tgz",
-      "integrity": "sha1-28EOjX2VsQJyehmvPw/O9+JSsI4="
+      "version": "1.33.0",
+      "resolved": "https://registry.npmjs.org/vscode-debugprotocol/-/vscode-debugprotocol-1.33.0.tgz",
+      "integrity": "sha512-d+l4lrEz6OP2kmGpweqe37x9H7icAMV8S4m8azTWGAIlNJxBP4rlSTnZa7NMLcbgqWkWG9lTGY7fJ+rSPaW7yg=="
     },
     "vscode-extension-telemetry": {
-      "version": "0.1.0",
-      "resolved": "https://registry.npmjs.org/vscode-extension-telemetry/-/vscode-extension-telemetry-0.1.0.tgz",
-      "integrity": "sha512-WVCnP+uLxlqB6UD98yQNV47mR5Rf79LFxpuZhSPhEf0Sb4tPZed3a63n003/dchhOwyCTCBuNN4n8XKJkLEI1Q==",
+      "version": "0.1.1",
+      "resolved": "https://registry.npmjs.org/vscode-extension-telemetry/-/vscode-extension-telemetry-0.1.1.tgz",
+      "integrity": "sha512-TkKKG/B/J94DP5qf6xWB4YaqlhWDg6zbbqVx7Bz//stLQNnfE9XS1xm3f6fl24c5+bnEK0/wHgMgZYKIKxPeUA==",
       "requires": {
-        "applicationinsights": "1.0.6"
+        "applicationinsights": "1.0.8"
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     "vscode-jsonrpc": {
@@ -7199,9 +5624,9 @@
       }
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     "yazl": {
-      "version": "2.4.3",
-      "resolved": "https://registry.npmjs.org/yazl/-/yazl-2.4.3.tgz",
-      "integrity": "sha1-7CblzIfVYBud+EMtvdPNLlFzoHE=",
+      "version": "2.5.1",
+      "resolved": "https://registry.npmjs.org/yazl/-/yazl-2.5.1.tgz",
+      "integrity": "sha512-phENi2PLiHnHb6QBVot+dJnaAZ0xosj7p3fWl+znIjBDlnMI2PsZCJZ306BPTFOaHf5qdDEI8x5qFrSOBN5vrw==",
       "dev": true,
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diff --git a/Extension/package.json b/Extension/package.json
index bd82f44471..2c2a0fdfa1 100644
--- a/Extension/package.json
+++ b/Extension/package.json
@@ -2,7 +2,7 @@
   "name": "cpptools",
   "displayName": "C/C++",
   "description": "C/C++ IntelliSense, debugging, and code browsing.",
-  "version": "0.21.0",
+  "version": "0.22.0",
   "publisher": "ms-vscode",
   "preview": true,
   "icon": "LanguageCCPP_color_128x.png",
@@ -12,7 +12,7 @@
   },
   "license": "SEE LICENSE IN LICENSE.txt",
   "engines": {
-    "vscode": "^1.26.0"
+    "vscode": "^1.30.0"
   },
   "bugs": {
     "url": "https://github.com/Microsoft/vscode-cpptools/issues",
@@ -289,6 +289,19 @@
           "description": "Determines whether pop up notifications will be shown when a configuration provider extension is unable to provide a configuration for a source file.",
           "scope": "resource"
         },
+        "C_Cpp.intelliSenseCachePath": {
+          "type": "string",
+          "default": "${workspaceFolder}/.vscode",
+          "description": "Defines the folder path for cached precompiled headers used by IntelliSense. The default path \"${workspaceFolder}/.vscode\" will be used if a specified path is invalid.",
+          "scope": "resource"
+        },
+        "C_Cpp.intelliSenseCacheSize": {
+          "type": "number",
+          "default": 5120,
+          "description": "Maximum size of the per-workspace hard drive space in megabytes for cached precompiled headers; the actual usage may fluctuate around this value. The default size is 5120 MB. Precompiled header caching is disabled when the size is 0.",
+          "scope": "resource",
+          "minimum": 0
+        },
         "C_Cpp.default.includePath": {
           "type": [
             "array",
@@ -466,6 +479,12 @@
           "default": "Default",
           "description": "Set to \"Insiders\" to automatically download and install the latest Insiders builds of the extension, which include upcoming features and bug fixes.",
           "scope": "resource"
+        },
+        "C_Cpp.suggestSnippets": {
+          "type": "boolean",
+          "default": true,
+          "description": "If true, snippets are provided by the language server.",
+          "scope": "resource"
         }
       }
     },
@@ -549,6 +568,11 @@
         "command": "C_Cpp.TakeSurvey",
         "title": "%c_cpp.command.takeSurvey.title%",
         "category": "C/C++"
+      },
+      {
+        "command": "C_Cpp.BuildAndDebugActiveFile",
+        "title": "%c_cpp.command.buildAndDebugActiveFile.title%",
+        "category": "C/C++"
       }
     ],
     "keybindings": [
@@ -603,7 +627,6 @@
             "cpp"
           ]
         },
-        "adapterExecutableCommand": "extension.cppdbgAdapterExecutableCommand",
         "aiKey": "AIF-d9b70cd4-b9f9-4d70-929b-a071c400b217",
         "variables": {
           "pickProcess": "extension.pickNativeProcess",
@@ -954,12 +977,12 @@
                 "anyOf": [
                   {
                     "type": "string",
-                    "description": "Optional process id to attach the debugger to. Use \"${command:pickProcesss}\" to get a list of local running processes to attach to. Note that some platforms require administrator privileges in order to attach to a process.",
+                    "description": "Optional process id to attach the debugger to. Use \"${command:pickProcess}\" to get a list of local running processes to attach to. Note that some platforms require administrator privileges in order to attach to a process.",
                     "default": "${command:pickProcess}"
                   },
                   {
                     "type": "integer",
-                    "description": "Optional process id to attach the debugger to. Use \"${command:pickProcesss}\" to get a list of local running processes to attach to. Note that some platforms require administrator privileges in order to attach to a process.",
+                    "description": "Optional process id to attach the debugger to. Use \"${command:pickProcess}\" to get a list of local running processes to attach to. Note that some platforms require administrator privileges in order to attach to a process.",
                     "default": 0
                   }
                 ]
@@ -1100,7 +1123,6 @@
             "cpp"
           ]
         },
-        "adapterExecutableCommand": "extension.cppvsdbgAdapterExecutableCommand",
         "aiKey": "AIF-d9b70cd4-b9f9-4d70-929b-a071c400b217",
         "variables": {
           "pickProcess": "extension.pickNativeProcess"
@@ -1236,12 +1258,12 @@
                 "anyOf": [
                   {
                     "type": "string",
-                    "description": "Optional process id to attach the debugger to. Use \"${command:pickProcesss}\" to get a list of local running processes to attach to. Note that some platforms require administrator privileges in order to attach to a process.",
+                    "description": "Optional process id to attach the debugger to. Use \"${command:pickProcess}\" to get a list of local running processes to attach to. Note that some platforms require administrator privileges in order to attach to a process.",
                     "default": "${command:pickProcess}"
                   },
                   {
                     "type": "integer",
-                    "description": "Optional process id to attach the debugger to. Use \"${command:pickProcesss}\" to get a list of local running processes to attach to. Note that some platforms require administrator privileges in order to attach to a process.",
+                    "description": "Optional process id to attach the debugger to. Use \"${command:pickProcess}\" to get a list of local running processes to attach to. Note that some platforms require administrator privileges in order to attach to a process.",
                     "default": 0
                   }
                 ]
@@ -1321,42 +1343,52 @@
         {
           "when": "editorLangId == c",
           "command": "C_Cpp.SwitchHeaderSource",
-          "group": "other@1"
+          "group": "other1_navigation@1"
         },
         {
           "when": "editorLangId == cpp",
           "command": "C_Cpp.SwitchHeaderSource",
-          "group": "other@1"
+          "group": "other1_navigation@1"
         },
         {
           "when": "editorLangId == c",
           "command": "C_Cpp.Navigate",
-          "group": "other@2"
+          "group": "other1_navigation@2"
         },
         {
           "when": "editorLangId == cpp",
           "command": "C_Cpp.Navigate",
-          "group": "other@2"
+          "group": "other1_navigation@2"
         },
         {
           "when": "editorLangId == c",
           "command": "workbench.action.gotoSymbol",
-          "group": "other@3"
+          "group": "other1_navigation@3"
         },
         {
           "when": "editorLangId == cpp",
           "command": "workbench.action.gotoSymbol",
-          "group": "other@3"
+          "group": "other1_navigation@3"
         },
         {
           "when": "editorLangId == c",
           "command": "workbench.action.showAllSymbols",
-          "group": "other@4"
+          "group": "other1_navigation@4"
         },
         {
           "when": "editorLangId == cpp",
           "command": "workbench.action.showAllSymbols",
-          "group": "other@4"
+          "group": "other1_navigation@4"
+        },
+        {
+          "when": "editorLangId == cpp",
+          "command": "C_Cpp.BuildAndDebugActiveFile",
+          "group": "other2_debug@1"
+        },
+        {
+          "when": "editorLangId == c",
+          "command": "C_Cpp.BuildAndDebugActiveFile",
+          "group": "other2_debug@1"
         }
       ]
     },
@@ -1383,21 +1415,23 @@
     "watch": "tsc -watch -p ./"
   },
   "devDependencies": {
-    "@types/mocha": "^2.2.43",
-    "@types/node": "^8.0.46",
+    "@types/mocha": "^5.2.6",
+    "@types/node": "^8.10.43",
     "async-child-process": "^1.1.1",
+    "await-notify": "^1.0.1",
     "child-process": "^1.0.2",
+    "extend": "3.0.2",
     "gulp": "^4.0.0",
     "gulp-env": "0.4.0",
     "gulp-mocha": "5.0.0",
     "gulp-tslint": "8.1.2",
-    "mocha": "^4.0.1",
+    "mocha": "^5.2.0",
     "tslint": "5.8.0",
     "tslint-microsoft-contrib": "5.0.1",
     "tslint-no-unused-expression-chai": "0.0.3",
-    "typescript": "^2.5.3",
-    "vrsource-tslint-rules": "^5.8.2",
-    "vscode": "^1.1.18"
+    "typescript": "^2.9.2",
+    "vrsource-tslint-rules": "^5.8.3",
+    "vscode": "^1.1.30"
   },
   "dependencies": {
     "@types/minimatch": "^3.0.3",
@@ -1408,16 +1442,16 @@
     "mkdirp": "~0.5.1",
     "tmp": "~0.0.33",
     "vscode-cpptools": "2.1.1",
-    "vscode-debugadapter": "~1.24.0",
-    "vscode-debugprotocol": "~1.24.0",
-    "vscode-extension-telemetry": "~0.1.0",
+    "vscode-debugadapter": "~1.33.0",
+    "vscode-debugprotocol": "~1.33.0",
+    "vscode-extension-telemetry": "^0.1.1",
     "vscode-languageclient": "5.1.1",
     "yauzl": "~2.10.0"
   },
   "runtimeDependencies": [
     {
       "description": "C/C++ language components (Linux / x86_64)",
-      "url": "https://go.microsoft.com/fwlink/?linkid=2037608",
+      "url": "https://go.microsoft.com/fwlink/?linkid=2065016",
       "platforms": [
         "linux"
       ],
@@ -1431,7 +1465,7 @@
     },
     {
       "description": "C/C++ language components (Linux / x86)",
-      "url": "https://go.microsoft.com/fwlink/?linkid=2037526",
+      "url": "https://go.microsoft.com/fwlink/?linkid=2065017",
       "platforms": [
         "linux"
       ],
@@ -1447,7 +1481,7 @@
     },
     {
       "description": "C/C++ language components (OS X)",
-      "url": "https://go.microsoft.com/fwlink/?linkid=2037527",
+      "url": "https://go.microsoft.com/fwlink/?linkid=2064955",
       "platforms": [
         "darwin"
       ],
@@ -1458,7 +1492,7 @@
     },
     {
       "description": "C/C++ language components (Windows)",
-      "url": "https://go.microsoft.com/fwlink/?linkid=2037609",
+      "url": "https://go.microsoft.com/fwlink/?linkid=2065027",
       "platforms": [
         "win32"
       ],
@@ -1572,11 +1606,11 @@
     },
     {
       "description": "Visual Studio Windows Debugger",
-      "url": "https://go.microsoft.com/fwlink/?linkid=872985",
+      "url": "https://go.microsoft.com/fwlink/?linkid=2082216",
       "platforms": [
         "win32"
       ],
       "binaries": []
     }
   ]
-}
+}
\ No newline at end of file
diff --git a/Extension/package.nls.it.json b/Extension/package.nls.it.json
index e6735b8399..78b9f62b7f 100644
--- a/Extension/package.nls.it.json
+++ b/Extension/package.nls.it.json
@@ -14,5 +14,6 @@
     "c_cpp.command.pauseParsing.title": "Metti in pausa l'analisi del codice",
     "c_cpp.command.resumeParsing.title": "Riprendi l'analisi del codice",
     "c_cpp.command.showParsingCommands.title": "Mostra comandi per l'analisi del codice",
-    "c_cpp.command.takeSurvey.title": "Partecipa al Sondaggio"
+    "c_cpp.command.takeSurvey.title": "Partecipa al Sondaggio",
+    "c_cpp.command.buildAndDebugActiveFile.title": "Compila ed Esegui il debug del file attivo"
 }
\ No newline at end of file
diff --git a/Extension/package.nls.json b/Extension/package.nls.json
index 07190b6125..fdd276cd63 100644
--- a/Extension/package.nls.json
+++ b/Extension/package.nls.json
@@ -2,8 +2,8 @@
     "c_cpp.command.configurationSelect.title": "Select a configuration...",
     "c_cpp.command.configurationProviderSelect.title": "Change configuration provider...",
     "c_cpp.command.configurationEdit.title": "Edit configurations...",
-    "c_cpp.command.goToDeclaration.title": "Go to declaration",
-    "c_cpp.command.peekDeclaration.title": "Peek declaration",
+    "c_cpp.command.goToDeclaration.title": "Go to Declaration",
+    "c_cpp.command.peekDeclaration.title": "Peek Declaration",
     "c_cpp.command.switchHeaderSource.title": "Switch Header/Source",
     "c_cpp.command.navigate.title": "Navigate...",
     "c_cpp.command.toggleErrorSquiggles.title": "Toggle error squiggles",
@@ -14,5 +14,6 @@
     "c_cpp.command.pauseParsing.title": "Pause parsing",
     "c_cpp.command.resumeParsing.title": "Resume parsing",
     "c_cpp.command.showParsingCommands.title": "Show parsing commands",
-    "c_cpp.command.takeSurvey.title": "Take survey"
+    "c_cpp.command.takeSurvey.title": "Take survey",
+    "c_cpp.command.buildAndDebugActiveFile.title": "Build and Debug Active File"
 }
\ No newline at end of file
diff --git a/Extension/package.nls.zh-cn.json b/Extension/package.nls.zh-cn.json
new file mode 100644
index 0000000000..3d40e60849
--- /dev/null
+++ b/Extension/package.nls.zh-cn.json
@@ -0,0 +1,19 @@
+{
+    "c_cpp.command.configurationSelect.title": "选择配置...",
+    "c_cpp.command.configurationProviderSelect.title": "更换配置提供程序...",
+    "c_cpp.command.configurationEdit.title": "编辑配置...",
+    "c_cpp.command.goToDeclaration.title": "跳转到声明",
+    "c_cpp.command.peekDeclaration.title": "查看声明",
+    "c_cpp.command.switchHeaderSource.title": "切换头文件/源文件",
+    "c_cpp.command.navigate.title": "导航...",
+    "c_cpp.command.toggleErrorSquiggles.title": "切换错误下划线",
+    "c_cpp.command.toggleIncludeFallback.title": "切换IntelliSense引擎头文件包含错误回退",
+    "c_cpp.command.toggleDimInactiveRegions.title": "切换非活跃区域着色",
+    "c_cpp.command.showReleaseNotes.title": "查看版本说明",
+    "c_cpp.command.resetDatabase.title": "重置IntelliSense数据",
+    "c_cpp.command.pauseParsing.title": "暂停解析",
+    "c_cpp.command.resumeParsing.title": "继续解析",
+    "c_cpp.command.showParsingCommands.title": "查看解析命令",
+    "c_cpp.command.takeSurvey.title": "调查问卷",
+    "c_cpp.command.buildAndDebugActiveFile.title": "生成和调试当前文件"
+}
\ No newline at end of file
diff --git a/Extension/src/Debugger/attachToProcess.ts b/Extension/src/Debugger/attachToProcess.ts
index 156e90806c..cff49a7a2c 100644
--- a/Extension/src/Debugger/attachToProcess.ts
+++ b/Extension/src/Debugger/attachToProcess.ts
@@ -105,9 +105,10 @@ export class RemoteAttachPicker {
 
     private getRemoteOSAndProcesses(pipeCmd: string): Promise<AttachItem[]> {
         // Commands to get OS and processes
-        const command: string = `sh -c 'uname && if [ $(uname) = "Linux" ] ; then ${PsProcessParser.psLinuxCommand} ; elif [ $(uname) = "Darwin" ] ; ` +
-            `then ${PsProcessParser.psDarwinCommand}; fi'`;
+        const command: string = `sh -c "uname && if [ $(uname) = \\\"Linux\\\" ] ; then ${PsProcessParser.psLinuxCommand} ; elif [ $(uname) = \\\"Darwin\\\" ] ; ` +
+            `then ${PsProcessParser.psDarwinCommand}; fi"`;
 
+        // Must use single quotes around ${command}. Linux systems evaluate $() within double-quotes.
         return execChildProcess(`${pipeCmd} '${command}'`, null, this._channel).then(output => {
             // OS will be on first line
             // Processess will follow if listed
diff --git a/Extension/src/Debugger/configurationProvider.ts b/Extension/src/Debugger/configurationProvider.ts
index ac64edbfd7..55fb345a41 100644
--- a/Extension/src/Debugger/configurationProvider.ts
+++ b/Extension/src/Debugger/configurationProvider.ts
@@ -7,11 +7,81 @@ import * as debugUtils from './utils';
 import * as os from 'os';
 import * as path from 'path';
 import * as vscode from 'vscode';
+import { getBuildTasks, BuildTaskDefinition } from '../LanguageServer/extension';
+import * as util from '../common';
+import * as fs from 'fs';
+import * as Telemetry from '../telemetry';
+import { buildAndDebugActiveFileStr } from './extension';
 
 import { IConfiguration, IConfigurationSnippet, DebuggerType, MIConfigurations, WindowsConfigurations, WSLConfigurations, PipeTransportConfigurations } from './configurations';
 import { parse } from 'jsonc-parser';
+import { PlatformInformation } from '../platform';
 
-abstract class CppConfigurationProvider implements vscode.DebugConfigurationProvider {
+function isDebugLaunchStr(str: string): boolean {
+    return str === "(gdb) Launch" || str === "(lldb) Launch" || str === "(Windows) Launch";
+}
+
+/*
+ * Retrieves configurations from a provider and displays them in a quickpick menu to be selected.
+ * Ensures that the selected configuration's preLaunchTask (if existent) is populated in the user's task.json.
+ * Automatically starts debugging for "Build and Debug" configurations.
+ */
+export class QuickPickConfigurationProvider implements vscode.DebugConfigurationProvider {
+    private underlyingProvider: vscode.DebugConfigurationProvider;
+
+    public constructor(provider: CppConfigurationProvider) {
+        this.underlyingProvider = provider;
+    }
+
+    async provideDebugConfigurations(folder: vscode.WorkspaceFolder | undefined, token?: vscode.CancellationToken): Promise<vscode.DebugConfiguration[]> {
+        const configs: vscode.DebugConfiguration[] = await this.underlyingProvider.provideDebugConfigurations(folder, token);
+        const defaultConfig: vscode.DebugConfiguration = configs.find(config => { return isDebugLaunchStr(config.name); });
+        console.assert(defaultConfig);
+        const editor: vscode.TextEditor = vscode.window.activeTextEditor;
+        if (!editor || !util.fileIsCOrCppSource(editor.document.fileName) || configs.length <= 1) {
+            return [defaultConfig];
+        }
+        interface MenuItem extends vscode.QuickPickItem {
+            configuration: vscode.DebugConfiguration;
+        }
+
+        const items: MenuItem[] = configs.map<MenuItem>(config => {
+            let menuItem: MenuItem = {label: config.name, configuration: config};
+            // Rename the menu item for the default configuration as its name is non-descriptive.
+            if (isDebugLaunchStr(menuItem.label)) {
+                menuItem.label = "Default Configuration";
+            }
+            return menuItem;
+        });
+
+        const selection: MenuItem = await vscode.window.showQuickPick(items, {placeHolder: "Select a configuration"});
+        if (!selection) {
+            throw new Error(); // User canceled it.
+        }
+        if (selection.label.startsWith("cl.exe")) {
+            if (!process.env.DevEnvDir || process.env.DevEnvDir.length === 0) {
+                vscode.window.showErrorMessage('cl.exe build and debug is only usable when VS Code is run from the Developer Command Prompt for VS.');
+                throw new Error();
+            }
+        }
+        if (selection.label.indexOf(buildAndDebugActiveFileStr()) !== -1 && selection.configuration.preLaunchTask) {
+            try {
+                await util.ensureBuildTaskExists(selection.configuration.preLaunchTask);
+                await vscode.debug.startDebugging(folder, selection.configuration);
+                Telemetry.logDebuggerEvent("buildAndDebug", { "success": "true" });
+            } catch (e) {
+                Telemetry.logDebuggerEvent("buildAndDebug", { "success": "false" });
+            }
+        }
+        return [selection.configuration];
+    }
+
+    resolveDebugConfiguration(folder: vscode.WorkspaceFolder | undefined, config: vscode.DebugConfiguration, token?: vscode.CancellationToken): vscode.ProviderResult<vscode.DebugConfiguration> {
+        return this.underlyingProvider.resolveDebugConfiguration(folder, config, token);
+    }
+}
+
+class CppConfigurationProvider implements vscode.DebugConfigurationProvider {
     private type: DebuggerType;
     private provider: IConfigurationAssetProvider;
 
@@ -23,8 +93,85 @@ abstract class CppConfigurationProvider implements vscode.DebugConfigurationProv
     /**
 	 * Returns a list of initial debug configurations based on contextual information, e.g. package.json or folder.
 	 */
-    provideDebugConfigurations(folder: vscode.WorkspaceFolder | undefined, token?: vscode.CancellationToken): vscode.ProviderResult<vscode.DebugConfiguration[]> {
-        return this.provider.getInitialConfigurations(this.type);
+    async provideDebugConfigurations(folder: vscode.WorkspaceFolder | undefined, token?: vscode.CancellationToken): Promise<vscode.DebugConfiguration[]> {
+        let buildTasks: vscode.Task[] = await getBuildTasks(); 
+        if (buildTasks.length === 0) {
+            return Promise.resolve(this.provider.getInitialConfigurations(this.type));
+        }
+        const defaultConfig: vscode.DebugConfiguration = this.provider.getInitialConfigurations(this.type).find(config => {
+            return isDebugLaunchStr(config.name);
+        });
+        console.assert(defaultConfig, "Could not find default debug configuration.");
+
+        const platformInfo: PlatformInformation = await PlatformInformation.GetPlatformInformation();
+        const platform: string = platformInfo.platform;
+
+        // Filter out build tasks that don't match the currently selectede debug configuration type.
+        buildTasks = buildTasks.filter((task: vscode.Task) => {
+            if (defaultConfig.name === "(Windows) Launch") {
+                if (task.name.startsWith("cl.exe")) {
+                    return true;
+                }
+            } else {
+                if (!task.name.startsWith("cl.exe")) {
+                    return true;
+                }
+            }
+            return false;
+        });
+
+        // Generate new configurations for each build task.
+        // Generating a task is async, therefore we must *await* *all* map(task => config) Promises to resolve.
+        let configs: vscode.DebugConfiguration[] = await Promise.all(buildTasks.map<Promise<vscode.DebugConfiguration>>(async task => {
+            const definition: BuildTaskDefinition = task.definition as BuildTaskDefinition;
+            const compilerName: string = path.basename(definition.compilerPath);
+
+            let newConfig: vscode.DebugConfiguration = Object.assign({}, defaultConfig); // Copy enumerables and properties
+
+            newConfig.name = compilerName + buildAndDebugActiveFileStr();
+            newConfig.preLaunchTask = task.name;
+            newConfig.externalConsole = false;
+            const exeName: string = path.join("${fileDirname}", "${fileBasenameNoExtension}");
+            newConfig.program = platform === "win32" ? exeName + ".exe" : exeName;
+
+            return new Promise<vscode.DebugConfiguration>(resolve => {
+                if (platform === "darwin") {
+                    return resolve(newConfig);
+                } else {
+                    let debuggerName: string;
+                    if (compilerName.startsWith("clang")) {
+                        newConfig.MIMode = "lldb";
+                        const suffixIndex: number = compilerName.indexOf("-");
+                        const suffix: string = suffixIndex === -1 ? "" : compilerName.substr(suffixIndex);
+                        debuggerName = "lldb-mi" + suffix;
+                    } else if (compilerName === "cl.exe") {
+                        newConfig.miDebuggerPath = undefined;
+                        newConfig.type = "cppvsdbg";
+                        return resolve(newConfig);
+                    } else {
+                        debuggerName = "gdb";
+                    }
+        
+                    if (platform === "win32") {
+                        debuggerName += ".exe";
+                    }
+        
+                    const compilerDirname: string = path.dirname(definition.compilerPath);
+                    const debuggerPath: string = path.join(compilerDirname, debuggerName);
+                    fs.stat(debuggerPath, (err, stats: fs.Stats) => {
+                        if (!err && stats && stats.isFile) {
+                            newConfig.miDebuggerPath = debuggerPath;
+                        } else {
+                            // TODO should probably resolve a missing debugger in a more graceful fashion for win32.
+                            newConfig.miDebuggerPath = path.join("/usr", "bin", debuggerName);
+                        }
+                        return resolve(newConfig);
+                    });
+                }
+            });
+        }));
+        configs.push(defaultConfig);
+        return configs;
     }
 
     /**
diff --git a/Extension/src/Debugger/debugAdapterDescriptorFactory.ts b/Extension/src/Debugger/debugAdapterDescriptorFactory.ts
new file mode 100644
index 0000000000..5734265f82
--- /dev/null
+++ b/Extension/src/Debugger/debugAdapterDescriptorFactory.ts
@@ -0,0 +1,74 @@
+/* --------------------------------------------------------------------------------------------
+ * Copyright (c) Microsoft Corporation. All Rights Reserved.
+ * See 'LICENSE' in the project root for license information.
+ * ------------------------------------------------------------------------------------------ */
+
+import * as vscode from "vscode";
+import * as util from '../common';
+import * as path from 'path';
+import * as os from 'os';
+
+// Registers DebugAdapterDescriptorFactory for `cppdbg` and `cppvsdbg`. If it is not ready, it will prompt a wait for the download dialog.
+// NOTE: This file is not automatically tested.
+
+abstract class AbstractDebugAdapterDescriptorFactory implements vscode.DebugAdapterDescriptorFactory {
+    protected readonly context: vscode.ExtensionContext;
+
+    // This is important for the Mock Debugger since it can not use src/common
+    constructor(context: vscode.ExtensionContext) {
+        this.context = context;
+    }
+
+    abstract createDebugAdapterDescriptor(session: vscode.DebugSession, executable: vscode.DebugAdapterExecutable | undefined): vscode.ProviderResult<vscode.DebugAdapterDescriptor>;
+}
+
+export class CppdbgDebugAdapterDescriptorFactory extends AbstractDebugAdapterDescriptorFactory {
+    public static DEBUG_TYPE : string = "cppdbg";
+
+    constructor(context: vscode.ExtensionContext) {
+        super(context);
+    }
+
+    createDebugAdapterDescriptor(session: vscode.DebugSession, executable: vscode.DebugAdapterExecutable | undefined): vscode.ProviderResult<vscode.DebugAdapterDescriptor> {
+        return util.isExtensionReady().then(ready => {
+            if (ready) {
+                let command: string = path.join(this.context.extensionPath, './debugAdapters/OpenDebugAD7');
+
+                // Windows has the exe in debugAdapters/bin.
+                if (os.platform() === 'win32') {
+                    command = path.join(this.context.extensionPath, "./debugAdapters/bin/OpenDebugAD7.exe");
+                }
+
+                return new vscode.DebugAdapterExecutable(command, []);
+            } else {
+                throw new Error(util.extensionNotReadyString);
+            }
+        });
+    }
+}
+
+export class CppvsdbgDebugAdapterDescriptorFactory extends AbstractDebugAdapterDescriptorFactory {
+    public static DEBUG_TYPE : string = "cppvsdbg";
+
+    constructor(context: vscode.ExtensionContext) {
+        super(context);
+    }
+
+    createDebugAdapterDescriptor(session: vscode.DebugSession, executable: vscode.DebugAdapterExecutable | undefined): vscode.ProviderResult<vscode.DebugAdapterDescriptor> {
+        if (os.platform() !== 'win32') {
+            vscode.window.showErrorMessage("Debugger type 'cppvsdbg' is not avaliable for non-Windows machines.");
+            return null;
+        } else {
+            return util.isExtensionReady().then(ready => {
+                if (ready) {
+                    return new vscode.DebugAdapterExecutable(
+                        path.join(this.context.extensionPath, './debugAdapters/vsdbg/bin/vsdbg.exe'),
+                        ['--interpreter=vscode']
+                    );
+                } else {
+                    throw new Error(util.extensionNotReadyString);
+                }
+            });
+        }
+    }
+}
\ No newline at end of file
diff --git a/Extension/src/Debugger/extension.ts b/Extension/src/Debugger/extension.ts
index 9438b6a3a1..5208b1c65f 100644
--- a/Extension/src/Debugger/extension.ts
+++ b/Extension/src/Debugger/extension.ts
@@ -7,14 +7,19 @@ import * as vscode from 'vscode';
 import * as os from 'os';
 import { AttachPicker, RemoteAttachPicker, AttachItemsProvider } from './attachToProcess';
 import { NativeAttachItemsProviderFactory } from './nativeAttach';
-import { ConfigurationAssetProviderFactory, CppVsDbgConfigurationProvider, CppDbgConfigurationProvider, ConfigurationSnippetProvider, IConfigurationAssetProvider } from './configurationProvider';
+import { QuickPickConfigurationProvider, ConfigurationAssetProviderFactory, CppVsDbgConfigurationProvider, CppDbgConfigurationProvider, ConfigurationSnippetProvider, IConfigurationAssetProvider } from './configurationProvider';
+import { CppdbgDebugAdapterDescriptorFactory, CppvsdbgDebugAdapterDescriptorFactory } from './debugAdapterDescriptorFactory';
 import * as util from '../common';
-import * as path from 'path';
+import * as Telemetry from '../telemetry';
 
 // The extension deactivate method is asynchronous, so we handle the disposables ourselves instead of using extensonContext.subscriptions.
 let disposables: vscode.Disposable[] = [];
 
-export function initialize(): void {
+export function buildAndDebugActiveFileStr(): string {
+    return " build and debug active file";
+}
+
+export function initialize(context: vscode.ExtensionContext): void {
     // Activate Process Picker Commands
     let attachItemsProvider: AttachItemsProvider = NativeAttachItemsProviderFactory.Get();
     let attacher: AttachPicker = new AttachPicker(attachItemsProvider);
@@ -26,10 +31,91 @@ export function initialize(): void {
     let configurationProvider: IConfigurationAssetProvider = ConfigurationAssetProviderFactory.getConfigurationProvider();
     // On non-windows platforms, the cppvsdbg debugger will not be registered for initial configurations.
     // This will cause it to not show up on the dropdown list.
+    let vsdbgProvider: CppVsDbgConfigurationProvider = null;
     if (os.platform() === 'win32') {
-        disposables.push(vscode.debug.registerDebugConfigurationProvider('cppvsdbg', new CppVsDbgConfigurationProvider(configurationProvider)));
+        vsdbgProvider = new CppVsDbgConfigurationProvider(configurationProvider);
+        disposables.push(vscode.debug.registerDebugConfigurationProvider('cppvsdbg', new QuickPickConfigurationProvider(vsdbgProvider)));
     }
-    disposables.push(vscode.debug.registerDebugConfigurationProvider('cppdbg', new CppDbgConfigurationProvider(configurationProvider)));
+    const provider: CppDbgConfigurationProvider = new CppDbgConfigurationProvider(configurationProvider);
+    disposables.push(vscode.debug.registerDebugConfigurationProvider('cppdbg', new QuickPickConfigurationProvider(provider)));
+
+    disposables.push(vscode.commands.registerTextEditorCommand("C_Cpp.BuildAndDebugActiveFile", async (textEditor: vscode.TextEditor, edit: vscode.TextEditorEdit, ...args: any[]) => {
+        const folder: vscode.WorkspaceFolder = vscode.workspace.getWorkspaceFolder(textEditor.document.uri);
+        if (!folder) {
+            // Not enabled because we do not react to single-file mode correctly yet.
+            // We get an ENOENT when the user's c_cpp_properties.json is attempted to be parsed.
+            // The DefaultClient will also have its configuration accessed, but since it doesn't exist it errors out.
+            vscode.window.showErrorMessage('This command is not yet available for single-file mode.');
+            return Promise.resolve();
+        }
+
+        if (!util.fileIsCOrCppSource(textEditor.document.uri.fsPath)) {
+            vscode.window.showErrorMessage('Cannot build and debug because the active file is not a C or C++ source file.');
+            return Promise.resolve();
+        }
+        
+        let configs: vscode.DebugConfiguration[] = (await provider.provideDebugConfigurations(folder)).filter(config => {
+            return config.name.indexOf(buildAndDebugActiveFileStr()) !== -1;
+        });
+
+        if (vsdbgProvider) {
+            let vsdbgConfigs: vscode.DebugConfiguration[] = (await vsdbgProvider.provideDebugConfigurations(folder)).filter(config => {
+                return config.name.indexOf(buildAndDebugActiveFileStr()) !== -1;
+            });
+            if (vsdbgConfigs) {
+                configs.push(...vsdbgConfigs);
+            }
+        }
+
+        interface MenuItem extends vscode.QuickPickItem {
+            configuration: vscode.DebugConfiguration;
+        }
+
+        const items: MenuItem[] = configs.map<MenuItem>(config => {
+            return {label: config.name, configuration: config};
+        });
+
+        vscode.window.showQuickPick(items, {placeHolder: (items.length === 0 ? "No compiler found" : "Select a compiler" )}).then(async selection => {
+            if (!selection) {
+                return; // User canceled it.
+            }
+            if (selection.label.startsWith("cl.exe")) {
+                if (!process.env.DevEnvDir || process.env.DevEnvDir.length === 0) {
+                    vscode.window.showErrorMessage('cl.exe build and debug is only usable when VS Code is run from the Developer Command Prompt for VS.');
+                    return;
+                }
+            }
+            if (selection.configuration.preLaunchTask) {
+                if (folder) {
+                    try {
+                        await util.ensureBuildTaskExists(selection.configuration.preLaunchTask);
+                        Telemetry.logDebuggerEvent("buildAndDebug", { "success": "false" });
+                    } catch (e) {
+                        return Promise.resolve();
+                    }
+                } else {
+                    return Promise.resolve();
+                    // TODO uncomment this when single file mode works correctly.
+                    // const buildTasks: vscode.Task[] = await getBuildTasks();
+                    // const task: vscode.Task = buildTasks.find(task => task.name === selection.configuration.preLaunchTask);
+                    // await vscode.tasks.executeTask(task);
+                    // delete selection.configuration.preLaunchTask;
+                }
+            }
+
+            // Attempt to use the user's (possibly) modified configuration before using the generated one.
+            try {
+                await vscode.debug.startDebugging(folder, selection.configuration.name);
+                Telemetry.logDebuggerEvent("buildAndDebug", { "success": "true" });
+            } catch (e) {
+                try {
+                    vscode.debug.startDebugging(folder, selection.configuration);
+                } catch (e) {
+                    Telemetry.logDebuggerEvent("buildAndDebug", { "success": "false" });
+                }
+            }
+        });
+    }));
 
     configurationProvider.getConfigurationSnippets();
 
@@ -38,57 +124,17 @@ export function initialize(): void {
         language: 'jsonc',
         pattern: '**/launch.json'
     }];
+
     // ConfigurationSnippetProvider needs to be initiallized after configurationProvider calls getConfigurationSnippets.
     disposables.push(vscode.languages.registerCompletionItemProvider(launchJsonDocumentSelector, new ConfigurationSnippetProvider(configurationProvider)));
 
-    // Activate Adapter Commands 
-    registerAdapterExecutableCommands();
+    // Register Debug Adapters
+    disposables.push(vscode.debug.registerDebugAdapterDescriptorFactory(CppvsdbgDebugAdapterDescriptorFactory.DEBUG_TYPE, new CppvsdbgDebugAdapterDescriptorFactory(context)));
+    disposables.push(vscode.debug.registerDebugAdapterDescriptorFactory(CppdbgDebugAdapterDescriptorFactory.DEBUG_TYPE, new CppdbgDebugAdapterDescriptorFactory(context)));
 
     vscode.Disposable.from(...disposables);
 }
 
 export function dispose(): void {
     disposables.forEach(d => d.dispose());
-}
-
-// Registers adapterExecutableCommands for cppdbg and cppvsdbg. If it is not ready, it will prompt waiting for the download.
-// 
-// Note: util.extensionContext.extensionPath is needed for the commands because VsCode does not support relative paths for adapterExecutableComand
-function registerAdapterExecutableCommands(): void {
-    disposables.push(vscode.commands.registerCommand('extension.cppdbgAdapterExecutableCommand', () => {
-        return util.isExtensionReady().then(ready => {
-            if (ready) {
-                let command: string = path.join(util.extensionContext.extensionPath, './debugAdapters/OpenDebugAD7');
-
-                // Windows has the exe in debugAdapters/bin.
-                if (os.platform() === 'win32') {
-                    command = path.join(util.extensionContext.extensionPath, "./debugAdapters/bin/OpenDebugAD7.exe");
-                }
-
-                return {
-                    command: command
-                };
-            } else {
-                throw new Error(util.extensionNotReadyString);
-            }
-        });
-    }));
-
-    disposables.push(vscode.commands.registerCommand('extension.cppvsdbgAdapterExecutableCommand', () => {
-        if (os.platform() !== 'win32') {
-            vscode.window.showErrorMessage("Debugger type 'cppvsdbg' is not avaliable for non-Windows machines.");
-            return null;
-        } else {
-            return util.isExtensionReady().then(ready => {
-                if (ready) {
-                    return {
-                        command: path.join(util.extensionContext.extensionPath, './debugAdapters/vsdbg/bin/vsdbg.exe'),
-                        args: ['--interpreter=vscode']
-                    };
-                } else {
-                    throw new Error(util.extensionNotReadyString);
-                }
-            });
-        }
-    }));
-}
+}
\ No newline at end of file
diff --git a/Extension/src/LanguageServer/client.ts b/Extension/src/LanguageServer/client.ts
index a4ba37098a..ef6f759710 100644
--- a/Extension/src/LanguageServer/client.ts
+++ b/Extension/src/LanguageServer/client.ts
@@ -23,13 +23,14 @@ import { createProtocolFilter } from './protocolFilter';
 import { DataBinding } from './dataBinding';
 import minimatch = require("minimatch");
 import * as logger from '../logger';
-import { updateLanguageConfigurations } from './extension';
+import { updateLanguageConfigurations, registerCommands } from './extension';
 import { CancellationTokenSource } from 'vscode';
 import { SettingsTracker, getTracker } from './settingsTracker';
 import { getTestHook, TestHook } from '../testHook';
 import { getCustomConfigProviders, CustomConfigurationProviderCollection, CustomConfigurationProvider1 } from '../LanguageServer/customProviders';
 import { ABTestSettings, getABTestSettings } from '../abTesting';
 import * as fs from 'fs';
+import * as os from 'os';
 
 let ui: UI;
 const configProviderTimeout: number = 2000;
@@ -202,6 +203,8 @@ export interface Client {
     updateCustomBrowseConfiguration(requestingProvider?: CustomConfigurationProvider1): Thenable<void>;
     provideCustomConfiguration(document: vscode.TextDocument): Promise<void>;
     getCurrentConfigName(): Thenable<string>;
+    getCompilerPath(): Thenable<string>;
+    getKnownCompilers(): Thenable<configs.KnownCompiler[]>;
     takeOwnership(document: vscode.TextDocument): void;
     queueTask<T>(task: () => Thenable<T>): Thenable<T>;
     requestWhenReady(request: () => Thenable<any>): Thenable<any>;
@@ -319,6 +322,10 @@ class DefaultClient implements Client {
                     // The event handlers must be set before this happens.
                     languageClient.sendRequest(QueryCompilerDefaultsRequest, {}).then((compilerDefaults: configs.CompilerDefaults) => {
                         this.configuration.CompilerDefaults = compilerDefaults;
+                        
+                        // Only register the real commands after the extension has finished initializing,
+                        // e.g. prevents empty c_cpp_properties.json from generation.
+                        registerCommands();
                     });
 
                     this.languageClient = languageClient;
@@ -373,6 +380,18 @@ class DefaultClient implements Client {
         }
 
         let abTestSettings: ABTestSettings = getABTestSettings();
+        
+        let intelliSenseCacheDisabled: boolean = false;
+        if (os.platform() === "darwin") {
+            intelliSenseCacheDisabled = true;
+            // TODO: Re-enable this after the performance is improved on Mac.
+            //const releaseParts: string[] = os.release().split(".");
+            //if (releaseParts.length >= 1) {
+            //    // AutoPCH doesn't work for older Mac OS's.
+            //    intelliSenseCacheDisabled = parseInt(releaseParts[0]) < 17;
+            //}
+        }
+
         let clientOptions: LanguageClientOptions = {
             documentSelector: [
                 { scheme: 'file', language: 'cpp' },
@@ -396,9 +415,13 @@ class DefaultClient implements Client {
                 tab_size: other.editorTabSize,
                 intelliSenseEngine: settings.intelliSenseEngine,
                 intelliSenseEngineFallback: settings.intelliSenseEngineFallback,
+                intelliSenseCacheDisabled: intelliSenseCacheDisabled,
+                intelliSenseCachePath : settings.intelliSenseCachePath,
+                intelliSenseCacheSize : settings.intelliSenseCacheSize,
                 autocomplete: settings.autoComplete,
                 errorSquiggles: settings.errorSquiggles,
                 dimInactiveRegions: settings.dimInactiveRegions,
+                suggestSnippets: settings.suggestSnippets,
                 loggingLevel: settings.loggingLevel,
                 workspaceParsingPriority: settings.workspaceParsingPriority,
                 workspaceSymbols: settings.workspaceSymbols,
@@ -661,6 +684,14 @@ class DefaultClient implements Client {
         return this.queueTask(() => Promise.resolve(this.configuration.CurrentConfiguration.name));
     }
 
+    public getCompilerPath(): Thenable<string> {
+        return this.queueTask(() => Promise.resolve(this.configuration.CompilerPath));
+    }
+
+    public getKnownCompilers(): Thenable<configs.KnownCompiler[]> {
+        return this.queueTask(() => Promise.resolve(this.configuration.KnownCompiler));
+    }
+
     /**
      * Take ownership of a document that was previously serviced by another client.
      * This process involves sending a textDocument/didOpen message to the server so
@@ -1349,6 +1380,8 @@ class NullClient implements Client {
     updateCustomBrowseConfiguration(requestingProvider?: CustomConfigurationProvider1): Thenable<void> { return Promise.resolve(); }
     provideCustomConfiguration(document: vscode.TextDocument): Promise<void> { return Promise.resolve(); }
     getCurrentConfigName(): Thenable<string> { return Promise.resolve(""); }
+    getCompilerPath(): Thenable<string> { return Promise.resolve(""); }
+    getKnownCompilers(): Thenable<configs.KnownCompiler[]> { return Promise.resolve([]); }
     takeOwnership(document: vscode.TextDocument): void {}
     queueTask<T>(task: () => Thenable<T>): Thenable<T> { return task(); }
     requestWhenReady(request: () => Thenable<any>): Thenable<any> { return; }
diff --git a/Extension/src/LanguageServer/clientCollection.ts b/Extension/src/LanguageServer/clientCollection.ts
index e14ad626de..fed01ec11a 100644
--- a/Extension/src/LanguageServer/clientCollection.ts
+++ b/Extension/src/LanguageServer/clientCollection.ts
@@ -175,7 +175,8 @@ export class ClientCollection {
     }
 
     private onDidOpenTextDocument(document: vscode.TextDocument): void {
-        if (document.languageId === "c" || document.languageId === "cpp") {
+        if (document.languageId === "c" || document.languageId === "cpp"
+            || document.languageId === "json" && document.uri.fsPath.endsWith("c_cpp_properties.json")) {
             // Make sure a client exists for this document's workspace.
             this.getClientFor(document.uri);
         }
diff --git a/Extension/src/LanguageServer/configurations.ts b/Extension/src/LanguageServer/configurations.ts
index 69ffbc4bb1..9ef947e65c 100644
--- a/Extension/src/LanguageServer/configurations.ts
+++ b/Extension/src/LanguageServer/configurations.ts
@@ -13,6 +13,7 @@ import { PersistentFolderState } from './persistentState';
 import { CppSettings } from './settings';
 import { ABTestSettings, getABTestSettings } from '../abTesting';
 import { getCustomConfigProviders } from './customProviders';
+import * as os from 'os';
 const configVersion: number = 4;
 
 type Environment = { [key: string]: string | string[] };
@@ -46,6 +47,7 @@ export interface ConfigurationJson {
 export interface Configuration {
     name: string;
     compilerPath?: string;
+    knownCompilers?: KnownCompiler[];
     cStandard?: string;
     cppStandard?: string;
     includePath?: string[];
@@ -65,19 +67,26 @@ export interface Browse {
     databaseFilename?: string;
 }
 
+export interface KnownCompiler {
+    path: string;
+    isC: boolean;
+}
+
 export interface CompilerDefaults {
     compilerPath: string;
+    knownCompilers: KnownCompiler[];
     cStandard: string;
     cppStandard: string;
     includes: string[];
     frameworks: string[];
     windowsSdkVersion: string;
     intelliSenseMode: string;
+    rootfs: string;
 }
 
 export class CppProperties {
     private rootUri: vscode.Uri;
-    private propertiesFile: vscode.Uri = null;
+    private propertiesFile: vscode.Uri = undefined;
     private readonly configFolder: string;
     private configurationJson: ConfigurationJson = null;
     private currentConfigurationIndex: PersistentFolderState<number>;
@@ -85,6 +94,7 @@ export class CppProperties {
     private configFileWatcherFallbackTime: Date = new Date(); // Used when file watching fails.
     private compileCommandFileWatchers: fs.FSWatcher[] = [];
     private defaultCompilerPath: string = null;
+    private knownCompilers: KnownCompiler[] = null;
     private defaultCStandard: string = null;
     private defaultCppStandard: string = null;
     private defaultIncludes: string[] = null;
@@ -98,6 +108,9 @@ export class CppProperties {
     private configurationsChanged = new vscode.EventEmitter<Configuration[]>();
     private selectionChanged = new vscode.EventEmitter<number>();
     private compileCommandsChanged = new vscode.EventEmitter<string>();
+    private diagnosticCollection: vscode.DiagnosticCollection;
+    private prevSquiggleMetrics: Map<string, { [key: string]: number }> = new Map<string, { [key: string]: number }>();
+    private rootfs: string = null;
 
     // Any time the default settings are parsed and assigned to `this.configurationJson`,
     // we want to track when the default includes have been added to it.
@@ -109,32 +122,7 @@ export class CppProperties {
         let rootPath: string = rootUri ? rootUri.fsPath : "";
         this.currentConfigurationIndex = new PersistentFolderState<number>("CppProperties.currentConfigurationIndex", -1, rootPath);
         this.configFolder = path.join(rootPath, ".vscode");
-
-        let configFilePath: string = path.join(this.configFolder, "c_cpp_properties.json");
-        if (fs.existsSync(configFilePath)) {
-            this.propertiesFile = vscode.Uri.file(configFilePath);
-            this.parsePropertiesFile();
-        }
-        if (!this.configurationJson) {
-            this.resetToDefaultSettings(this.CurrentConfigurationIndex === -1);
-        }
-
-        this.configFileWatcher = vscode.workspace.createFileSystemWatcher(path.join(this.configFolder, this.configurationGlobPattern));
-        this.disposables.push(this.configFileWatcher);
-        this.configFileWatcher.onDidCreate((uri) => {
-            this.propertiesFile = uri;
-            this.handleConfigurationChange();
-        });
-
-        this.configFileWatcher.onDidDelete(() => {
-            this.propertiesFile = null;
-            this.resetToDefaultSettings(true);
-            this.handleConfigurationChange();
-        });
-
-        this.configFileWatcher.onDidChange(() => {
-            this.handleConfigurationChange();
-        });
+        this.diagnosticCollection = vscode.languages.createDiagnosticCollection(rootPath);
 
         this.buildVcpkgIncludePath();
 
@@ -144,9 +132,11 @@ export class CppProperties {
     public get ConfigurationsChanged(): vscode.Event<Configuration[]> { return this.configurationsChanged.event; }
     public get SelectionChanged(): vscode.Event<number> { return this.selectionChanged.event; }
     public get CompileCommandsChanged(): vscode.Event<string> { return this.compileCommandsChanged.event; }
-    public get Configurations(): Configuration[] { return this.configurationJson.configurations; }
+    public get Configurations(): Configuration[] { return this.configurationJson ? this.configurationJson.configurations : null; }
     public get CurrentConfigurationIndex(): number { return this.currentConfigurationIndex.Value; }
-    public get CurrentConfiguration(): Configuration { return this.Configurations[this.CurrentConfigurationIndex]; }
+    public get CurrentConfiguration(): Configuration { return this.Configurations ? this.Configurations[this.CurrentConfigurationIndex] : null; }
+    public get CompilerPath(): string { return this.CurrentConfiguration ? this.CurrentConfiguration.compilerPath : null; }
+    public get KnownCompiler(): KnownCompiler[] { return this.knownCompilers; }
 
     public get CurrentConfigurationProvider(): string|null {
         if (this.CurrentConfiguration.configurationProvider) {
@@ -163,15 +153,41 @@ export class CppProperties {
 
     public set CompilerDefaults(compilerDefaults: CompilerDefaults) {
         this.defaultCompilerPath = compilerDefaults.compilerPath;
+        this.knownCompilers = compilerDefaults.knownCompilers;
         this.defaultCStandard = compilerDefaults.cStandard;
         this.defaultCppStandard = compilerDefaults.cppStandard;
         this.defaultIncludes = compilerDefaults.includes;
         this.defaultFrameworks = compilerDefaults.frameworks;
         this.defaultWindowsSdkVersion = compilerDefaults.windowsSdkVersion;
         this.defaultIntelliSenseMode = compilerDefaults.intelliSenseMode;
+        this.rootfs = compilerDefaults.rootfs;
 
         // defaultPaths is only used when there isn't a c_cpp_properties.json, but we don't send the configuration changed event
         // to the language server until the default include paths and frameworks have been sent.
+        let configFilePath: string = path.join(this.configFolder, "c_cpp_properties.json");
+        if (fs.existsSync(configFilePath)) {
+            this.propertiesFile = vscode.Uri.file(configFilePath);
+        } else {
+            this.propertiesFile = null;
+        }
+        
+        this.configFileWatcher = vscode.workspace.createFileSystemWatcher(path.join(this.configFolder, this.configurationGlobPattern));
+        this.disposables.push(this.configFileWatcher);
+        this.configFileWatcher.onDidCreate((uri) => {
+            this.propertiesFile = uri;
+            this.handleConfigurationChange();
+        });
+
+        this.configFileWatcher.onDidDelete(() => {
+            this.propertiesFile = null;
+            this.resetToDefaultSettings(true);
+            this.handleConfigurationChange();
+        });
+
+        this.configFileWatcher.onDidChange(() => {
+            this.handleConfigurationChange();
+        });
+
         this.handleConfigurationChange();
     }
 
@@ -185,6 +201,7 @@ export class CppProperties {
 
     private onSelectionChanged(): void {
         this.selectionChanged.fire(this.CurrentConfigurationIndex);
+        this.handleSquiggles();
     }
 
     private onCompileCommandsChanged(path: string): void {
@@ -242,9 +259,15 @@ export class CppProperties {
             if (isUnset(settings.defaultWindowsSdkVersion) && this.defaultWindowsSdkVersion && process.platform === 'win32') {
                 configuration.windowsSdkVersion = this.defaultWindowsSdkVersion;
             }
-            if (isUnset(settings.defaultCompilerPath) && this.defaultCompilerPath) {
+            if (isUnset(settings.defaultCompilerPath) && this.defaultCompilerPath &&
+                isUnset(settings.defaultCompileCommands) && !configuration.compileCommands) {
+                // compile_commands.json already specifies a compiler. compilerPath overrides the compile_commands.json compiler so
+                // don't set a default when compileCommands is in use.
                 configuration.compilerPath = this.defaultCompilerPath;
             }
+            if (this.knownCompilers) {
+                configuration.knownCompilers = this.knownCompilers;
+            }
             if (isUnset(settings.defaultCStandard) && this.defaultCStandard) {
                 configuration.cStandard = this.defaultCStandard;
             }
@@ -412,9 +435,9 @@ export class CppProperties {
     private resolveAndSplit(paths: string[] | undefined, defaultValue: string[], env: Environment): string[] {
         let result: string[] = [];
         if (paths) {
+            paths = this.resolveDefaults(paths, defaultValue);
             paths.forEach(entry => {
                 let entries: string[] = util.resolveVariables(entry, env).split(";").filter(e => e);
-                entries = this.resolveDefaults(entries, defaultValue);
                 result = result.concat(entries);
             });
         }
@@ -450,6 +473,9 @@ export class CppProperties {
     }
 
     private updateServerOnFolderSettingsChange(): void {
+        if (!this.configurationJson) {
+            return;
+        }
         let settings: CppSettings = new CppSettings(this.rootUri);
         let env: Environment = this.ExtendedEnvironment;
         for (let i: number = 0; i < this.configurationJson.configurations.length; i++) {
@@ -478,7 +504,7 @@ export class CppProperties {
                     // If the user doesn't set browse.path, copy the includePath over. Make sure ${workspaceFolder} is in there though...
                     configuration.browse.path = configuration.includePath.slice(0);
                     if (-1 === configuration.includePath.findIndex((value: string, index: number) => {
-                        return !!value.match(/^\$\{(workspaceRoot|workspaceFolder)\}(\\|\\\*\*|\/|\/\*\*)?$/g);
+                        return !!value.match(/^\$\{(workspaceRoot|workspaceFolder)\}(\\\*{0,2}|\/\*{0,2})?$/g);
                     })) {
                         configuration.browse.path.push("${workspaceFolder}");
                     }
@@ -545,7 +571,10 @@ export class CppProperties {
                             });
                             settings.update("default.configurationProvider", undefined); // delete the setting
                         }
+                        let savedKnownCompilers: KnownCompiler[] = this.configurationJson.configurations[0].knownCompilers;
+                        delete this.configurationJson.configurations[0].knownCompilers;
                         edit.insert(document.uri, new vscode.Position(0, 0), JSON.stringify(this.configurationJson, null, 4));
+                        this.configurationJson.configurations[0].knownCompilers = savedKnownCompilers;
                         vscode.workspace.applyEdit(edit).then((status) => {
                             // Fix for issue 163
                             // https://github.com/Microsoft/vscppsamples/issues/163
@@ -566,12 +595,15 @@ export class CppProperties {
     }
 
     private handleConfigurationChange(): void {
+        if (this.propertiesFile === undefined) {
+            return; // Occurs when propertiesFile hasn't been checked yet.
+        }
         this.configFileWatcherFallbackTime = new Date();
         if (this.propertiesFile) {
             this.parsePropertiesFile();
             // parsePropertiesFile can fail, but it won't overwrite an existing configurationJson in the event of failure.
             // this.configurationJson should only be undefined here if we have never successfully parsed the propertiesFile.
-            if (this.configurationJson !== undefined) {
+            if (this.configurationJson) {
                 if (this.CurrentConfigurationIndex < 0 ||
                     this.CurrentConfigurationIndex >= this.configurationJson.configurations.length) {
                     // If the index is out of bounds (during initialization or due to removal of configs), fix it.
@@ -580,7 +612,7 @@ export class CppProperties {
             }
         }
 
-        if (this.configurationJson === undefined) {
+        if (!this.configurationJson) {
             this.resetToDefaultSettings(true);  // I don't think there's a case where this will be hit anymore.
         }
 
@@ -595,6 +627,11 @@ export class CppProperties {
                 return; // Repros randomly when the file is initially created. The parse will get called again after the file is written.
             }
 
+            // Replace all \<escape character> with \\<character>.
+            // Otherwise, the JSON.parse result will have the \<escape character> missing.
+            readResults = readResults.replace(/\\/g, '\\\\');
+            readResults = readResults.replace(/\\\\"/g, '\\"'); // Need to revert the change to \".
+
             // Try to use the same configuration as before the change.
             let newJson: ConfigurationJson = JSON.parse(readResults);
             if (!newJson || !newJson.configurations || newJson.configurations.length === 0) {
@@ -658,15 +695,213 @@ export class CppProperties {
                     fs.writeFileSync(this.propertiesFile.fsPath, JSON.stringify(this.configurationJson, null, 4));
                 } catch (err) {
                     // Ignore write errors, the file may be under source control. Updated settings will only be modified in memory.
-                    vscode.window.showWarningMessage('Attempt to update "' + this.propertiesFile.fsPath + '" failed (do you have write access?)');
+                    vscode.window.showWarningMessage(`Attempt to update "${this.propertiesFile.fsPath}" failed (do you have write access?)`);
                 }
             }
+
+            this.handleSquiggles();
         } catch (err) {
-            vscode.window.showErrorMessage('Failed to parse "' + this.propertiesFile.fsPath + '": ' + err.message);
+            vscode.window.showErrorMessage(`Failed to parse "${this.propertiesFile.fsPath}": ${err.message}`);
             throw err;
         }
     }
 
+    private handleSquiggles(): void {
+        if (!this.propertiesFile) {
+            return;
+        }
+        vscode.workspace.openTextDocument(this.propertiesFile).then((document: vscode.TextDocument) => {
+            let diagnostics: vscode.Diagnostic[] = new Array<vscode.Diagnostic>();
+
+            // Get the text of the current configuration.
+            let curText: string = document.getText();
+            let curTextStartOffset: number = 0;
+            const configStart: number = curText.search(new RegExp(`{\\s*"name"\\s*:\\s*"${this.CurrentConfiguration.name}"`));
+            if (configStart === -1) {
+                telemetry.logLanguageServerEvent("ConfigSquiggles", { "error": "config name not first" });
+                return;
+            }
+            curTextStartOffset = configStart + 1;
+            curText = curText.substr(curTextStartOffset); // Remove earlier configs.
+            const nameEnd: number = curText.indexOf(":");
+            curTextStartOffset += nameEnd + 1;
+            curText = curText.substr(nameEnd + 1);
+            const nextNameStart: number = curText.search(new RegExp('"name"\\s*:\\s*"'));
+            if (nextNameStart !== -1) {
+                curText = curText.substr(0, nextNameStart + 6); // Remove later configs.
+                const nextNameStart2: number = curText.search(new RegExp('\\s*}\\s*,\\s*{\\s*"name"'));
+                if (nextNameStart2 === -1) {
+                    telemetry.logLanguageServerEvent("ConfigSquiggles", { "error": "next config name not first" });
+                    return;
+                }
+                curText = curText.substr(0, nextNameStart2);
+            }
+
+            // TODO: Add other squiggles.
+
+            // Check for path-related squiggles.
+            let paths: Set<string> = new Set<string>();
+            for (let pathArray of [ (this.CurrentConfiguration.browse ? this.CurrentConfiguration.browse.path : undefined),
+                    this.CurrentConfiguration.includePath, this.CurrentConfiguration.macFrameworkPath, this.CurrentConfiguration.forcedInclude ] ) {
+                if (pathArray) {
+                    for (let curPath of pathArray) {
+                        paths.add(`"${curPath}"`);
+                    }
+                }
+            }
+            if (this.CurrentConfiguration.compileCommands) {
+                paths.add(`"${this.CurrentConfiguration.compileCommands}"`);
+            }
+
+            if (this.CurrentConfiguration.compilerPath) {
+                // Unlike other cases, compilerPath may not start or end with " due to trimming of whitespace and the possibility of compiler args.
+                paths.add(`${this.CurrentConfiguration.compilerPath}`);
+            }
+
+            // Get the start/end for properties that are file-only.
+            const forcedIncludeStart: number = curText.search(/\s*\"forcedInclude\"\s*:\s*\[/);
+            const forcedeIncludeEnd: number = forcedIncludeStart === -1 ? -1 : curText.indexOf("]", forcedIncludeStart);
+            const compileCommandsStart: number = curText.search(/\s*\"compileCommands\"\s*:\s*\"/);
+            const compileCommandsEnd: number = compileCommandsStart === -1 ? -1 : curText.indexOf('"', curText.indexOf('"', curText.indexOf(":", compileCommandsStart)) + 1);
+            const compilerPathStart: number = curText.search(/\s*\"compilerPath\"\s*:\s*\"/);
+            const compilerPathEnd: number = compilerPathStart === -1 ? -1 : curText.indexOf('"', curText.indexOf('"', curText.indexOf(":", compilerPathStart)) + 1) + 1;
+
+            if (this.prevSquiggleMetrics[this.CurrentConfiguration.name] === undefined) {
+                this.prevSquiggleMetrics[this.CurrentConfiguration.name] = { PathNonExistent: 0, PathNotAFile: 0, PathNotADirectory: 0 };
+            }
+            let newSquiggleMetrics: { [key: string]: number } = { PathNonExistent: 0, PathNotAFile: 0, PathNotADirectory: 0 };
+            const isWindows: boolean = os.platform() === 'win32';
+
+            for (let curPath of paths) {
+                const isCompilerPath: boolean = curPath === this.CurrentConfiguration.compilerPath;
+                let resolvedPath: string = isCompilerPath ? curPath : curPath.substr(1, curPath.length - 2); // Remove the surrounding quotes.
+                // Resolve special path cases.
+                if (resolvedPath === "${default}") {
+                    // TODO: Add squiggles for when the C_Cpp.default.* paths are invalid.
+                    continue;
+                }
+                resolvedPath = util.resolveVariables(resolvedPath, this.ExtendedEnvironment);
+                if (resolvedPath.includes("${workspaceFolder}")) {
+                    resolvedPath = resolvedPath.replace("${workspaceFolder}", this.rootUri.fsPath);
+                }
+                if (resolvedPath.includes("${workspaceRoot}")) {
+                    resolvedPath = resolvedPath.replace("${workspaceRoot}", this.rootUri.fsPath);
+                }
+                if (resolvedPath.includes("${vcpkgRoot}")) {
+                    resolvedPath = resolvedPath.replace("${vcpkgRoot}", util.getVcpkgRoot());
+                }
+                if (resolvedPath.includes("*")) {
+                    resolvedPath = resolvedPath.replace(/\*/g, "");
+                }
+
+                // TODO: Invalid paths created from environment variables are not detected.
+
+                // Handle WSL paths.
+                const isWSL: boolean = isWindows && resolvedPath.startsWith("/");
+                if (isWSL) {
+                    const mntStr: string = "/mnt/";
+                    if (resolvedPath.length > "/mnt/c/".length && resolvedPath.substr(0, mntStr.length) === mntStr) {
+                        resolvedPath = resolvedPath.substr(mntStr.length);
+                        resolvedPath = resolvedPath.substr(0, 1) + ":" + resolvedPath.substr(1);
+                    } else if (this.rootfs && this.rootfs.length > 0) {
+                        resolvedPath = this.rootfs + resolvedPath.substr(1);
+                        // TODO: Handle WSL symlinks.
+                    }
+                }
+
+                if (isCompilerPath) {
+                    let compilerPathAndArgs: util.CompilerPathAndArgs = util.extractCompilerPathAndArgs(resolvedPath);
+                    if (isWindows && compilerPathAndArgs.compilerPath.endsWith("cl.exe")) {
+                        continue; // Don't squiggle invalid cl.exe paths because it could be for an older preview build.
+                    }
+                    resolvedPath = compilerPathAndArgs.compilerPath;
+                    curPath = curPath.replace(/\"/g, `\\"`);
+                }
+
+                let pathExists: boolean = true;
+                let existsWithExeAdded: (path: string) => boolean = (path: string) => {
+                    return isCompilerPath && isWindows && !isWSL && fs.existsSync(path + ".exe");
+                };
+                if (!fs.existsSync(resolvedPath)) {
+                    if (existsWithExeAdded(resolvedPath)) {
+                        resolvedPath += ".exe";
+                    } else {
+                        // Check again for a relative path.
+                        const relativePath: string = this.rootUri.fsPath + path.sep + resolvedPath;
+                        if (!fs.existsSync(relativePath)) {
+                            if (existsWithExeAdded(resolvedPath)) {
+                                resolvedPath += ".exe";
+                            } else {
+                                pathExists = false;
+                            }
+                        } else {
+                            resolvedPath = relativePath;
+                        }
+                    }
+                }
+
+                // Normalize path separators.
+                if (path.sep === "/") {
+                    resolvedPath = resolvedPath.replace(/\\/g, path.sep);
+                } else {
+                    resolvedPath = resolvedPath.replace(/\//g, path.sep);
+                }
+
+                // Iterate through the text and apply squiggles.
+                for (let curOffset: number = curText.indexOf(curPath); curOffset !== -1; curOffset = curText.indexOf(curPath, curOffset + curPath.length)) {
+                    let message: string;
+                    if (!pathExists) {
+                        message = `Cannot find "${resolvedPath}".`;
+                        newSquiggleMetrics.PathNonExistent++;
+                    } else {
+                        // Check for file versus path mismatches.
+                        if ((curOffset >= forcedIncludeStart && curOffset <= forcedeIncludeEnd) ||
+                            (curOffset >= compileCommandsStart && curOffset <= compileCommandsEnd) ||
+                            (curOffset >= compilerPathStart && curOffset <= compilerPathEnd)) {
+                            if (util.checkFileExistsSync(resolvedPath)) {
+                                continue;
+                            }
+                            message = `Path is not a file: "${resolvedPath}".`;
+                            newSquiggleMetrics.PathNotAFile++;
+                        } else {
+                            if (util.checkDirectoryExistsSync(resolvedPath)) {
+                                continue;
+                            }
+                            message = `Path is not a directory: "${resolvedPath}".`;
+                            newSquiggleMetrics.PathNotADirectory++;
+                        }
+                    }
+                    let diagnostic: vscode.Diagnostic = new vscode.Diagnostic(
+                        new vscode.Range(document.positionAt(curTextStartOffset + curOffset),
+                            document.positionAt(curTextStartOffset + curOffset + curPath.length + (!isCompilerPath ? -1 : 0))),
+                        message, vscode.DiagnosticSeverity.Warning);
+                    diagnostics.push(diagnostic);
+                }
+            }
+            if (diagnostics.length !== 0) {
+                this.diagnosticCollection.set(document.uri, diagnostics);
+            } else {
+                this.diagnosticCollection.clear();
+            }
+
+            // Send telemetry on squiggle changes.
+            let changedSquiggleMetrics: { [key: string]: number } = {};
+            if (newSquiggleMetrics.PathNonExistent !== this.prevSquiggleMetrics[this.CurrentConfiguration.name].PathNonExistent) {
+                changedSquiggleMetrics.PathNonExistent = newSquiggleMetrics.PathNonExistent;
+            }
+            if (newSquiggleMetrics.PathNotAFile !== this.prevSquiggleMetrics[this.CurrentConfiguration.name].PathNotAFile) {
+                changedSquiggleMetrics.PathNotAFile = newSquiggleMetrics.PathNotAFile;
+            }
+            if (newSquiggleMetrics.PathNotADirectory !== this.prevSquiggleMetrics[this.CurrentConfiguration.name].PathNotADirectory) {
+                changedSquiggleMetrics.PathNotADirectory = newSquiggleMetrics.PathNotADirectory;
+            }
+            if (Object.keys(changedSquiggleMetrics).length > 0) {
+                telemetry.logLanguageServerEvent("ConfigSquiggles", null, changedSquiggleMetrics);
+            }
+            this.prevSquiggleMetrics[this.CurrentConfiguration.name] = newSquiggleMetrics;
+        });
+    }
+
     private updateToVersion2(): void {
         this.configurationJson.version = 2;
         // no-op. We don't automatically populate the browse.path anymore.
@@ -718,13 +953,13 @@ export class CppProperties {
         let propertiesFile: string = path.join(this.configFolder, "c_cpp_properties.json");
         fs.stat(propertiesFile, (err, stats) => {
             if (err) {
-                if (this.propertiesFile !== null) {
+                if (this.propertiesFile) {
                     this.propertiesFile = null; // File deleted.
                     this.resetToDefaultSettings(true);
                     this.handleConfigurationChange();
                 }
             } else if (stats.mtime > this.configFileWatcherFallbackTime) {
-                if (this.propertiesFile === null) {
+                if (!this.propertiesFile) {
                     this.propertiesFile = vscode.Uri.file(propertiesFile); // File created.
                 }
                 this.handleConfigurationChange();
@@ -738,5 +973,7 @@ export class CppProperties {
 
         this.compileCommandFileWatchers.forEach((watcher: fs.FSWatcher) => watcher.close());
         this.compileCommandFileWatchers = []; //reset it
+
+        this.diagnosticCollection.dispose();
     }
 }
diff --git a/Extension/src/LanguageServer/extension.ts b/Extension/src/LanguageServer/extension.ts
index ae9df20d3c..0a875c0516 100644
--- a/Extension/src/LanguageServer/extension.ts
+++ b/Extension/src/LanguageServer/extension.ts
@@ -14,15 +14,17 @@ import { UI, getUI } from './ui';
 import { Client } from './client';
 import { ClientCollection } from './clientCollection';
 import { CppSettings } from './settings';
-import { PersistentWorkspaceState } from './persistentState';
+import { PersistentWorkspaceState, PersistentState } from './persistentState';
 import { getLanguageConfig } from './languageConfig';
 import { getCustomConfigProviders } from './customProviders';
 import { PlatformInformation } from '../platform';
 import { Range } from 'vscode-languageclient';
 import { ChildProcess, spawn, execSync } from 'child_process';
 import * as tmp from 'tmp';
-import { getTargetBuildInfo } from '../githubAPI';
+import { getTargetBuildInfo, BuildInfo } from '../githubAPI';
+import * as configs from './configurations';
 import { PackageVersion } from '../packageVersion';
+import { getTemporaryCommandRegistrarInstance } from '../commands';
 
 let prevCrashFile: string;
 let clients: ClientCollection;
@@ -36,12 +38,18 @@ let realActivationOccurred: boolean = false;
 let tempCommands: vscode.Disposable[] = [];
 let activatedPreviously: PersistentWorkspaceState<boolean>;
 const insiderUpdateTimerInterval: number = 1000 * 60 * 60;
+let buildInfoCache: BuildInfo | null = null;
+const taskSourceStr: string = "C/C++";
+const cppInstallVsixStr: string = 'C/C++: Install vsix -- ';
+let taskProvider: vscode.Disposable;
 
 /**
  * activate: set up the extension for language services
  */
 export function activate(activationEventOccurred: boolean): void {
-    console.log("activating extension");
+    if (realActivationOccurred) {
+        return; // Occurs if multiple delayed commands occur before the real commands are registered.
+    }
 
     // Activate immediately if an activation event occurred in the previous workspace session.
     // If onActivationEvent doesn't occur, it won't auto-activate next time.
@@ -51,8 +59,9 @@ export function activate(activationEventOccurred: boolean): void {
         realActivation();
     }
 
-    registerCommands();
-    tempCommands.push(vscode.workspace.onDidOpenTextDocument(d => onDidOpenTextDocument(d)));
+    if (tempCommands.length === 0) { // Only needs to be added once.
+        tempCommands.push(vscode.workspace.onDidOpenTextDocument(d => onDidOpenTextDocument(d)));
+    }
 
     // Check if an activation event has already occurred.
     if (activationEventOccurred) {
@@ -60,6 +69,21 @@ export function activate(activationEventOccurred: boolean): void {
         return;
     }
 
+    taskProvider = vscode.tasks.registerTaskProvider(taskSourceStr, {
+        provideTasks: () => {
+            return getBuildTasks();
+        },
+        resolveTask(task: vscode.Task): vscode.Task {
+            // Currently cannot implement because VS Code does not call this. Can implement custom output file directory when enabled.
+            return undefined;
+        }
+    });
+    vscode.tasks.onDidStartTask(event => {
+        if (event.execution.task.source === taskSourceStr) {
+            telemetry.logLanguageServerEvent('buildTaskStarted');
+        }
+    });
+
     // handle "workspaceContains:/.vscode/c_cpp_properties.json" activation event.
     if (vscode.workspace.workspaceFolders && vscode.workspace.workspaceFolders.length > 0) {
         for (let i: number = 0; i < vscode.workspace.workspaceFolders.length; ++i) {
@@ -83,6 +107,146 @@ export function activate(activationEventOccurred: boolean): void {
     }
 }
 
+export interface BuildTaskDefinition extends vscode.TaskDefinition {
+    compilerPath: string;
+}
+
+/**
+ * Generate tasks to build the current file based on the user's detected compilers, the user's compilerPath setting, and the current file's extension.
+ */
+export async function getBuildTasks(): Promise<vscode.Task[]> {
+    const editor: vscode.TextEditor = vscode.window.activeTextEditor;
+    if (!editor) {
+        return [];
+    }
+
+    const fileExt: string = path.extname(editor.document.fileName);
+    if (!fileExt) {
+        return;
+    }
+
+    // Don't offer tasks for header files.
+    const fileExtLower: string = fileExt.toLowerCase();
+    const isHeader: boolean = !fileExt || [".hpp", ".hh", ".hxx", ".h", ".inl", ""].some(ext => fileExtLower === ext);
+    if (isHeader) {
+        return [];
+    }
+
+    // Don't offer tasks if the active file's extension is not a recognized C/C++ extension.
+    let fileIsCpp: boolean;
+    let fileIsC: boolean;
+    if (fileExt === ".C") { // ".C" file extensions are both C and C++.
+        fileIsCpp = true;
+        fileIsC = true;
+    } else {
+        fileIsCpp = [".cpp", ".cc", ".cxx", ".mm", ".ino"].some(ext => fileExtLower === ext);
+        fileIsC = fileExtLower === ".c";
+    }
+    if (!(fileIsCpp || fileIsC)) {
+        return [];
+    }
+
+    // Get a list of compilers found from the C++ side, then filter them based on the file type to get a reduced list appropriate
+    // for the active file, remove duplicate compiler names, then finally add the user's compilerPath setting.
+    let compilerPaths: string[];
+    const isWindows: boolean = os.platform() === 'win32';
+    const activeClient: Client = getActiveClient();
+    let userCompilerPath: string = await activeClient.getCompilerPath();
+    if (userCompilerPath) {
+        userCompilerPath = userCompilerPath.trim();
+        if (isWindows && userCompilerPath.startsWith("/")) { // TODO: Add WSL compiler support.
+            userCompilerPath = null;
+        } else {
+            userCompilerPath = userCompilerPath.replace(/\\\\/g, "\\");
+        }
+    }
+
+    let knownCompilers: configs.KnownCompiler[] = await activeClient.getKnownCompilers();
+    if (knownCompilers) {
+        knownCompilers = knownCompilers.filter(info => {
+            return ((fileIsCpp && !info.isC) || (fileIsC && info.isC)) &&
+                (!isWindows || !info.path.startsWith("/")); // TODO: Add WSL compiler support.
+        });
+        compilerPaths = knownCompilers.map<string>(info => { return info.path; });
+
+        let map: Map<string, string> = new Map<string, string>();
+        const insertOrAssignEntry: (compilerPath: string) => void = (compilerPath: string): void => {
+            const basename: string = path.basename(compilerPath);
+            //map.has(basename) ? map.basename] = compilerPath : 
+            map.set(basename, compilerPath);
+        };
+        compilerPaths.forEach(insertOrAssignEntry);
+
+        // Ensure that the user's compilerPath setting is used by inserting/assigning last.
+        if (userCompilerPath) {
+            insertOrAssignEntry(userCompilerPath);
+        }
+
+        compilerPaths = [...map.values()];
+    } else if (userCompilerPath) {
+        compilerPaths = [userCompilerPath];
+    }
+
+    if (!compilerPaths) {
+        // Don't prompt a message yet until we can make a data-based decision.
+        telemetry.logLanguageServerEvent('noCompilerFound');
+        // Display a message prompting the user to install compilers if none were found.
+        // const dontShowAgain: string = "Don't Show Again";
+        // const learnMore: string = "Learn More";
+        // const message: string = "No C/C++ compiler found on the system. Please install a C/C++ compiler to use the C/C++: build active file tasks.";
+
+        // let showNoCompilerFoundMessage: PersistentState<boolean> = new PersistentState<boolean>("CPP.showNoCompilerFoundMessage", true);
+        // if (showNoCompilerFoundMessage) {
+        //     vscode.window.showInformationMessage(message, learnMore, dontShowAgain).then(selection => {
+        //         switch (selection) {
+        //             case learnMore:
+        //                 const uri: vscode.Uri = vscode.Uri.parse(`https://go.microsoft.com/fwlink/?linkid=864631`);
+        //                 vscode.commands.executeCommand('vscode.open', uri);
+        //                 break;
+        //             case dontShowAgain:
+        //                 showNoCompilerFoundMessage.Value = false;
+        //                 break;
+        //             default:
+        //                 break;
+        //         }
+        //     });
+        // }
+        return [];
+    }
+
+    // Generate tasks.
+    return compilerPaths.map<vscode.Task>(compilerPath => {
+        // Handle compiler args in compilerPath.
+        let compilerPathAndArgs: util.CompilerPathAndArgs = util.extractCompilerPathAndArgs(compilerPath);
+        compilerPath = compilerPathAndArgs.compilerPath;
+        const filePath: string = path.join('${fileDirname}', '${fileBasenameNoExtension}');
+        const compilerPathBase: string = path.basename(compilerPath);
+        const taskName: string = compilerPathBase + " build active file";
+        const isCl: boolean = taskName.startsWith("cl.exe");
+        let args: string[] = isCl ? [ '/Zi', '/EHsc', '/Fe:', filePath + '.exe', '${file}'  ] : ['-g', '${file}', '-o', filePath + (isWindows ? '.exe' : '')];
+        if (compilerPathAndArgs.additionalArgs) {
+            args = args.concat(compilerPathAndArgs.additionalArgs);
+        }
+        const cwd: string = isCl ? "" : path.dirname(compilerPath);
+        const kind: BuildTaskDefinition = {
+            type: 'shell',
+            label: taskName,
+            command: isCl ? compilerPathBase : compilerPath,
+            args: args,
+            options: isCl ? undefined : {"cwd": cwd},
+            compilerPath: isCl ? compilerPathBase : compilerPath
+        };
+
+        const command: vscode.ShellExecution = new vscode.ShellExecution(compilerPath, [...args], { cwd: cwd });
+        const target: vscode.WorkspaceFolder = vscode.workspace.getWorkspaceFolder(clients.ActiveClient.RootUri);
+        let task: vscode.Task = new vscode.Task(kind, target, taskName, taskSourceStr, command, '$gcc');
+        task.definition = kind; // The constructor for vscode.Task will eat the definition. Reset it by reassigning.
+        task.group = vscode.TaskGroup.Build;
+
+        return task;
+    });
+}
+
 function onDidOpenTextDocument(document: vscode.TextDocument): void {
     if (document.languageId === "c" || document.languageId === "cpp") {
         onActivationEvent();
@@ -108,6 +272,18 @@ function onActivationEvent(): void {
 function realActivation(): void {
     if (new CppSettings().intelliSenseEngine === "Disabled") {
         throw new Error("Do not activate the extension when IntelliSense is disabled.");
+    } else {
+        console.log("activating extension");
+        let checkForConflictingExtensions: PersistentState<boolean> = new PersistentState<boolean>("CPP." + util.packageJson.version + ".checkForConflictingExtensions", true);
+        if (checkForConflictingExtensions.Value) {
+            checkForConflictingExtensions.Value = false;
+            let clangCommandAdapterActive: boolean = vscode.extensions.all.some((extension: vscode.Extension<any>, index: number, array: vscode.Extension<any>[]): boolean => {
+                return extension.isActive && extension.id === "mitaki28.vscode-clang";
+            });
+            if (clangCommandAdapterActive) {
+                telemetry.logLanguageServerEvent("conflictingExtension");
+            }
+        }
     }
 
     realActivationOccurred = true;
@@ -136,9 +312,12 @@ function realActivation(): void {
     updateLanguageConfigurations();
 
     reportMacCrashes();
-
+    
     const settings: CppSettings = new CppSettings(clients.ActiveClient.RootUri);
-    if (settings.updateChannel === 'Insiders') {
+    
+    if (settings.updateChannel === 'Default') {
+        suggestInsidersChannel();
+    } else if (settings.updateChannel === 'Insiders') {
         insiderUpdateTimer = setInterval(checkAndApplyUpdate, insiderUpdateTimerInterval, settings.updateChannel);
         checkAndApplyUpdate(settings.updateChannel);
     }
@@ -169,7 +348,7 @@ function onDidChangeSettings(): void {
         } else if (newUpdateChannel === 'Insiders') {
             insiderUpdateTimer = setInterval(checkAndApplyUpdate, insiderUpdateTimerInterval);
         }
-
+        
         checkAndApplyUpdate(newUpdateChannel);
     }
 }
@@ -233,7 +412,7 @@ function onInterval(): void {
  * Install a VSIX package. This helper function will exist until VSCode offers a command to do so.
  * @param updateChannel The user's updateChannel setting.
  */
-async function installVsix(vsixLocation: string, updateChannel: string): Promise<void> {
+function installVsix(vsixLocation: string, updateChannel: string): Promise<void> {
     // Get the path to the VSCode command -- replace logic later when VSCode allows calling of
     // workbench.extensions.action.installVSIX from TypeScript w/o instead popping up a file dialog
     return PlatformInformation.GetPlatformInformation().then((platformInfo) => {
@@ -275,6 +454,21 @@ async function installVsix(vsixLocation: string, updateChannel: string): Promise
                 let process: ChildProcess;
                 try {
                     process = spawn(vsCodeScriptPath, ['--install-extension', vsixLocation, '--force']);
+                    
+                    // Timeout the process if no response is sent back. Ensures this Promise resolves/rejects
+                    const timer: NodeJS.Timer = setTimeout(() => {
+                        process.kill();
+                        reject(new Error('Failed to receive response from VS Code script process for installation within 30s.'));
+                    }, 30000);
+                    
+                    process.on('exit', (code: number) => {
+                        clearInterval(timer);
+                        if (code !== 0) {
+                            reject(new Error(`VS Code script exited with error code ${code}`));
+                        } else {
+                            resolve();
+                        }
+                    });
                     if (process.pid === undefined) {
                         throw new Error();
                     }
@@ -282,7 +476,6 @@ async function installVsix(vsixLocation: string, updateChannel: string): Promise
                     reject(new Error('Failed to launch VS Code script process for installation'));
                     return;
                 }
-                resolve();
             });
         }
 
@@ -320,78 +513,99 @@ async function installVsix(vsixLocation: string, updateChannel: string): Promise
     });
 }
 
-/**
- * Query package.json and the GitHub API to determine whether the user should update, if so then install the update.
- * The update can be an upgrade or downgrade depending on the the updateChannel setting.
- * @param updateChannel The user's updateChannel setting.
- */
-async function checkAndApplyUpdate(updateChannel: string): Promise<void> {
-    // Wrap in new Promise to allow tmp.file callback to successfully resolve/reject
-    // as tmp.file does not do anything with the callback functions return value
-    const p: Promise<void> = new Promise<void>((resolve, reject) => {
-        getTargetBuildInfo(updateChannel).then(buildInfo => {
-            if (!buildInfo) {
-                resolve();
+async function suggestInsidersChannel(): Promise<void> {
+    let suggestInsiders: PersistentState<boolean> = new PersistentState<boolean>("CPP.suggestInsiders", true);
+
+    if (!suggestInsiders.Value) {
+        return;
+    }
+    let buildInfo: BuildInfo;
+    try {
+        buildInfo = await getTargetBuildInfo("Insiders");
+    } catch (error) {
+        console.log(`${cppInstallVsixStr}${error.message}`);
+        if (error.message.indexOf('/') !== -1 || error.message.indexOf('\\') !== -1) {
+            error.message = "Potential PII hidden";
+        }
+        telemetry.logLanguageServerEvent('suggestInsiders', { 'error': error.message, 'success': 'false' });
+    }
+    if (!buildInfo) {
+        return; // No need to update.
+    }
+    const message: string = `Insiders version ${buildInfo.name} is available. Would you like to switch to the Insiders channel and install this update?`;
+    const yes: string = "Yes";
+    const askLater: string = "Ask Me Later";
+    const dontShowAgain: string = "Don't Show Again";
+    let selection: string = await vscode.window.showInformationMessage(message, yes, askLater, dontShowAgain);
+    switch (selection) {
+        case yes:
+            // Cache buildInfo.
+            buildInfoCache = buildInfo;
+            // It will call onDidChangeSettings.
+            vscode.workspace.getConfiguration("C_Cpp").update("updateChannel", "Insiders", vscode.ConfigurationTarget.Global);
+            break;
+        case dontShowAgain:
+            suggestInsiders.Value = false;
+            break;
+        case askLater:
+            break;
+        default:
+            break;
+    }
+}
+
+function applyUpdate(buildInfo: BuildInfo, updateChannel: string): Promise<void> {
+    return new Promise<void>((resolve, reject) => {
+        tmp.file({postfix: '.vsix'}, async (err, vsixPath, fd, cleanupCallback) => {
+            if (err) {
+                reject(new Error('Failed to create vsix file'));
                 return;
             }
-
-            // Create a temporary file, download the VSIX to it, then install the VSIX
-            tmp.file({postfix: '.vsix'}, async (err, vsixPath, fd, cleanupCallback) => {
-                if (err) {
-                    reject(new Error('Failed to create vsix file'));
-                    return;
-                }
-
-                // Place in try/catch as the .catch call catches a rejection in downloadFileToDestination
-                // then the .catch call will return a resolved promise
-                // Thusly, the .catch call must also throw, as a return would simply return an unused promise
-                // instead of returning early from this function scope
-                let config: vscode.WorkspaceConfiguration = vscode.workspace.getConfiguration();
-                let originalProxySupport: string = config.inspect<string>('http.proxySupport').globalValue;
-                while (true) { // Might need to try again with a different http.proxySupport setting.
-                    try {
-                        await util.downloadFileToDestination(buildInfo.downloadUrl, vsixPath);
-                    } catch {
-                        // Try again with the proxySupport to "off".
-                        if (originalProxySupport !== config.inspect<string>('http.proxySupport').globalValue) {
-                            config.update('http.proxySupport', originalProxySupport, true); // Reset the http.proxySupport.
-                            reject(new Error('Failed to download VSIX package with proxySupport off')); // Changing the proxySupport didn't help.
-                            return;
-                        }
-                        if (config.get('http.proxySupport') !== "off" && originalProxySupport !== "off") {
-                            config.update('http.proxySupport', "off", true);
-                            continue;
-                        }
-                        reject(new Error('Failed to download VSIX package'));
-                        return;
-                    }
+    
+            // Place in try/catch as the .catch call catches a rejection in downloadFileToDestination
+            // then the .catch call will return a resolved promise
+            // Thusly, the .catch call must also throw, as a return would simply return an unused promise
+            // instead of returning early from this function scope
+            let config: vscode.WorkspaceConfiguration = vscode.workspace.getConfiguration();
+            let originalProxySupport: string = config.inspect<string>('http.proxySupport').globalValue;
+            while (true) { // Might need to try again with a different http.proxySupport setting.
+                try {
+                    await util.downloadFileToDestination(buildInfo.downloadUrl, vsixPath);
+                } catch {
+                    // Try again with the proxySupport to "off".
                     if (originalProxySupport !== config.inspect<string>('http.proxySupport').globalValue) {
                         config.update('http.proxySupport', originalProxySupport, true); // Reset the http.proxySupport.
-                        telemetry.logLanguageServerEvent('installVsix', { 'error': "Success with proxySupport off", 'success': 'true' });
+                        reject(new Error('Failed to download VSIX package with proxySupport off')); // Changing the proxySupport didn't help.
+                        return;
                     }
-                    break;
-                }
-                try {
-                    await installVsix(vsixPath, updateChannel);
-                } catch (error) {
-                    reject(error);
+                    if (config.get('http.proxySupport') !== "off" && originalProxySupport !== "off") {
+                        config.update('http.proxySupport', "off", true);
+                        continue;
+                    }
+                    reject(new Error('Failed to download VSIX package'));
                     return;
                 }
-                clearInterval(insiderUpdateTimer);
-                const message: string =
-                    `The C/C++ Extension has been updated to version ${buildInfo.name}. Please reload the window for the changes to take effect.`;
-                util.promptReloadWindow(message);
-                telemetry.logLanguageServerEvent('installVsix', { 'success': 'true' });
-
-                resolve();
-            });
-        }, (error: Error) => {
-            // Handle getTargetBuildInfo rejection
-            reject(error);
+                if (originalProxySupport !== config.inspect<string>('http.proxySupport').globalValue) {
+                    config.update('http.proxySupport', originalProxySupport, true); // Reset the http.proxySupport.
+                    telemetry.logLanguageServerEvent('installVsix', { 'error': "Success with proxySupport off", 'success': 'true' });
+                }
+                break;
+            }
+            try {
+                await installVsix(vsixPath, updateChannel);
+            } catch (error) {
+                reject(error);
+                return;
+            }
+            clearInterval(insiderUpdateTimer);
+            const message: string =
+                `The C/C++ Extension has been updated to version ${buildInfo.name}. Please reload the window for the changes to take effect.`;
+            util.promptReloadWindow(message);
+            telemetry.logLanguageServerEvent('installVsix', { 'success': 'true' });
+            resolve();
         });
-    });
-    await p.catch((error: Error) => {
-        // Handle .then following getTargetBuildInfo rejection
+    }).catch(error => {
+        console.error(`${cppInstallVsixStr}${error.message}`);
         if (error.message.indexOf('/') !== -1 || error.message.indexOf('\\') !== -1) {
             error.message = "Potential PII hidden";
         }
@@ -399,11 +613,41 @@ async function checkAndApplyUpdate(updateChannel: string): Promise<void> {
     });
 }
 
+/**
+ * Query package.json and the GitHub API to determine whether the user should update, if so then install the update.
+ * The update can be an upgrade or downgrade depending on the the updateChannel setting.
+ * @param updateChannel The user's updateChannel setting.
+ */
+async function checkAndApplyUpdate(updateChannel: string): Promise<void> {
+    // If we have buildInfo cache, we should use it.
+    let buildInfo: BuildInfo | null = buildInfoCache;
+    // clear buildInfo cache.
+    buildInfoCache = null;
+    
+    if (!buildInfo) {
+        try {
+            buildInfo = await getTargetBuildInfo(updateChannel);
+        } catch (error) {
+            telemetry.logLanguageServerEvent('installVsix', { 'error': error.message, 'success': 'false' });
+        }
+    }
+    if (!buildInfo) {
+        return; // No need to update.
+    }
+    await applyUpdate(buildInfo, updateChannel);
+}
+
 /*********************************************
  * registered commands
  *********************************************/
+let commandsRegistered: boolean = false;
 
-function registerCommands(): void {
+export function registerCommands(): void {
+    if (commandsRegistered) {
+        return;
+    }
+    commandsRegistered = true;
+    getTemporaryCommandRegistrarInstance().clearTempCommands();
     disposables.push(vscode.commands.registerCommand('C_Cpp.Navigate', onNavigate));
     disposables.push(vscode.commands.registerCommand('C_Cpp.GoToDeclaration', onGoToDeclaration));
     disposables.push(vscode.commands.registerCommand('C_Cpp.PeekDeclaration', onPeekDeclaration));
@@ -421,6 +665,8 @@ function registerCommands(): void {
     disposables.push(vscode.commands.registerCommand('C_Cpp.ResumeParsing', onResumeParsing));
     disposables.push(vscode.commands.registerCommand('C_Cpp.ShowParsingCommands', onShowParsingCommands));
     disposables.push(vscode.commands.registerCommand('C_Cpp.TakeSurvey', onTakeSurvey));
+    disposables.push(vscode.commands.registerCommand('cpptools.activeConfigName', onGetActiveConfigName));
+    getTemporaryCommandRegistrarInstance().executeDelayedCommands();
 }
 
 function onNavigate(): void {
@@ -601,6 +847,10 @@ function onTakeSurvey(): void {
     vscode.commands.executeCommand('vscode.open', uri);
 }
 
+function onGetActiveConfigName(): Thenable<string> {
+    return clients.ActiveClient.getCurrentConfigName();
+}
+
 function reportMacCrashes(): void {
     if (process.platform === "darwin") {
         prevCrashFile = "";
@@ -675,6 +925,7 @@ function handleCrashFileRead(err: NodeJS.ErrnoException, data: string): void {
     
     // Get rid of the memory addresses (which breaks being able get a hit count for each crash call stack).
     data = data.replace(/0x................ /g, "");
+    data = data.replace(/0x1........ \+ 0/g, "");
 
     // Get rid of the process names on each line and just add it to the start.
     const process1: string = "Microsoft.VSCode.CPP.IntelliSense.Msvc.darwin\t";
@@ -716,6 +967,9 @@ export function deactivate(): Thenable<void> {
     disposables.forEach(d => d.dispose());
     languageConfigurations.forEach(d => d.dispose());
     ui.dispose();
+    if (taskProvider) {
+        taskProvider.dispose();
+    }
     return clients.dispose();
 }
 
@@ -735,4 +989,4 @@ export function getActiveClient(): Client {
         realActivation();
     }
     return clients.ActiveClient;
-}
\ No newline at end of file
+}
diff --git a/Extension/src/LanguageServer/settings.ts b/Extension/src/LanguageServer/settings.ts
index 50becfb8f9..a42edc9c7a 100644
--- a/Extension/src/LanguageServer/settings.ts
+++ b/Extension/src/LanguageServer/settings.ts
@@ -36,8 +36,11 @@ export class CppSettings extends Settings {
     public get clangFormatSortIncludes(): string { return super.Section.get<string>("clang_format_sortIncludes"); }
     public get clangFormatOnSave(): string { return super.Section.get<string>("clang_format_formatOnSave"); }
     public get formatting(): string { return super.Section.get<string>("formatting"); }
+    public get suggestSnippets(): boolean { return super.Section.get<boolean>("suggestSnippets"); }
     public get intelliSenseEngine(): string { return super.Section.get<string>("intelliSenseEngine"); }
     public get intelliSenseEngineFallback(): string { return super.Section.get<string>("intelliSenseEngineFallback"); }
+    public get intelliSenseCachePath(): string { return super.Section.get<string>("intelliSenseCachePath"); }
+    public get intelliSenseCacheSize(): number { return super.Section.get<number>("intelliSenseCacheSize"); }
     public get errorSquiggles(): string { return super.Section.get<string>("errorSquiggles"); }
     public get dimInactiveRegions(): boolean { return super.Section.get<boolean>("dimInactiveRegions"); }
     public get inactiveRegionOpacity(): number { return super.Section.get<number>("inactiveRegionOpacity"); }
diff --git a/Extension/src/LanguageServer/settingsTracker.ts b/Extension/src/LanguageServer/settingsTracker.ts
index 1850efbe64..ec60495113 100644
--- a/Extension/src/LanguageServer/settingsTracker.ts
+++ b/Extension/src/LanguageServer/settingsTracker.ts
@@ -160,7 +160,7 @@ export class SettingsTracker {
                     break;
                 }
                 default: {
-                    if (key === "clang_format_path" || key.startsWith("default.")) {
+                    if (key === "clang_format_path" || key === "intelliSenseCachePath" || key.startsWith("default.")) {
                         value = this.areEqual(val, settings.inspect(key).defaultValue) ? "<default>" : "..."; // Track whether it's being used, but nothing specific about it.
                     } else {
                         value = String(this.previousCppSettings[key]);
diff --git a/Extension/src/commands.ts b/Extension/src/commands.ts
index de94515aa9..e40f55ea88 100644
--- a/Extension/src/commands.ts
+++ b/Extension/src/commands.ts
@@ -11,7 +11,8 @@ class TemporaryCommandRegistrar {
     // Used to save/re-execute commands used before the extension has activated (e.g. delayed by dependency downloading).
     private delayedCommandsToExecute: Set<string>;
     private tempCommands: vscode.Disposable[]; // Need to save this to unregister/dispose the temporary commands.
-    private isLanguageServerDisabled: boolean;
+    private isLanguageServerDisabled: boolean = false;
+    private isActivationReady: boolean = false;
 
     private commandsToRegister: string[] = [
         "C_Cpp.ConfigurationEdit",
@@ -49,6 +50,9 @@ class TemporaryCommandRegistrar {
                 return;
             }
             this.delayedCommandsToExecute.add(command);
+            if (this.isActivationReady) {
+                LanguageServer.activate(true);
+            }
         }));
     }
 
@@ -58,13 +62,18 @@ class TemporaryCommandRegistrar {
 
     public activateLanguageServer(): void {
         // Main activation code.
+        LanguageServer.activate(this.delayedCommandsToExecute.size > 0);
+        this.isActivationReady = true;
+    }
+    
+    public clearTempCommands(): void {
         this.tempCommands.forEach((command) => {
             command.dispose();
         });
         this.tempCommands = [];
+    }
 
-        LanguageServer.activate(this.delayedCommandsToExecute.size > 0);
-        
+    public executeDelayedCommands(): void {
         this.delayedCommandsToExecute.forEach((command) => {
             vscode.commands.executeCommand(command);
         });
diff --git a/Extension/src/common.ts b/Extension/src/common.ts
index b0729d01a3..620a5883f5 100644
--- a/Extension/src/common.ts
+++ b/Extension/src/common.ts
@@ -16,6 +16,7 @@ import { getOutputChannelLogger, showOutputChannel } from './logger';
 import * as assert from 'assert';
 import * as https from 'https';
 import { ClientRequest, OutgoingHttpHeaders } from 'http';
+import { getBuildTasks } from './LanguageServer/extension';
 
 export let extensionContext: vscode.ExtensionContext;
 export function setExtensionContext(context: vscode.ExtensionContext): void {
@@ -36,6 +37,67 @@ export function getRawPackageJson(): any {
     return rawPackageJson;
 }
 
+export function getRawTasksJson(): Promise<any> {
+    const path: string = getTasksJsonPath();
+    if (!path) {
+        return undefined;
+    }
+    return new Promise<any>((resolve, reject) => {
+        fs.exists(path, exists => {
+            if (!exists) {
+                return resolve({});
+            }
+            const fileContents: Buffer = fs.readFileSync(path);
+            let rawTasks: any = {};
+            try {
+                rawTasks = JSON.parse(fileContents.toString()); 
+            } catch (error) {
+            }
+            resolve(rawTasks);
+        });
+    });
+}
+
+export async function ensureBuildTaskExists(taskName: string): Promise<void> {
+    let rawTasksJson: any = await getRawTasksJson();
+
+    // Ensure that the task exists in the user's task.json. Task will not be found otherwise.
+    if (!rawTasksJson.tasks) {
+        rawTasksJson.tasks = new Array();
+    }
+    // Find or create the task which should be created based on the selected "debug configuration".
+    let selectedTask: vscode.Task = rawTasksJson.tasks.find(task => {
+        return task.label && task.label === task;
+    });
+    if (selectedTask) {
+        return;
+    }
+
+    const buildTasks: vscode.Task[] = await getBuildTasks();
+    selectedTask = buildTasks.find(task => task.name === taskName);
+    console.assert(selectedTask);
+
+    let definition: vscode.TaskDefinition = selectedTask.definition as vscode.TaskDefinition;
+    if (definition && definition.compilerPath) {
+         // TODO: add desired properties to empty object, don't delete.
+        delete definition.compilerPath;
+    }
+    
+    rawTasksJson.version = "2.0.0";
+
+    if (!rawTasksJson.tasks.find(task => { return task.label === selectedTask.definition.label; })) {
+        rawTasksJson.tasks.push(selectedTask.definition);
+    }
+    
+    // TODO: It's dangerous to overwrite this file. We could be wiping out comments.
+    await writeFileText(getTasksJsonPath(), JSON.stringify(rawTasksJson, null, 2));
+}
+
+export function fileIsCOrCppSource(file: string): boolean {
+    const fileExtLower: string = path.extname(file).toLowerCase();
+    return [".C", ".c", ".cpp", ".cc", ".cxx", ".mm", ".ino", ".inl"].some(ext => fileExtLower === ext);
+}
+
 // This function is used to stringify the rawPackageJson.
 // Do not use with util.packageJson or else the expanded
 // package.json will be written back.
@@ -51,6 +113,15 @@ export function getPackageJsonPath(): string {
     return getExtensionFilePath("package.json");
 }
 
+export function getTasksJsonPath(): string {
+    const editor: vscode.TextEditor = vscode.window.activeTextEditor;
+    const folder: vscode.WorkspaceFolder = vscode.workspace.getWorkspaceFolder(editor.document.uri);
+    if (!folder) {
+        return undefined;
+    }
+    return path.join(folder.uri.fsPath, ".vscode", "tasks.json");
+}
+
 export function getVcpkgPathDescriptorFile(): string {
     if (process.platform === 'win32') {
         return path.join(process.env.LOCALAPPDATA, "vcpkg/vcpkg.path.txt");
@@ -386,6 +457,23 @@ export function checkDirectoryExists(dirPath: string): Promise<boolean> {
     });
 }
 
+export function checkFileExistsSync(filePath: string): boolean {
+    try {
+        return fs.statSync(filePath).isFile();
+    } catch (e) {
+    }
+    return false;
+}
+
+/** Test whether a directory exists */
+export function checkDirectoryExistsSync(dirPath: string): boolean {
+    try {
+        return fs.statSync(dirPath).isDirectory();
+    } catch (e) {
+    }
+    return false;
+}
+
 /** Read the files in a directory */
 export function readDir(dirPath: string): Promise<string[]> {
     return new Promise((resolve) => {
@@ -669,4 +757,48 @@ export function downloadFileToStr(urlStr: string, headers?: OutgoingHttpHeaders)
         request.on('error', (error) => { reject(error); });
         request.end();
     });
+}
+
+export interface CompilerPathAndArgs {
+    compilerPath: string;
+    additionalArgs: string[];
+}
+
+export function extractCompilerPathAndArgs(inputCompilerPath: string): CompilerPathAndArgs {
+    let compilerPath: string = inputCompilerPath;
+    let additionalArgs: string[];
+    let isWindows: boolean = os.platform() === 'win32';
+    if (compilerPath) {
+        compilerPath = compilerPath.trim();
+        if (compilerPath.startsWith("\"")) {
+            let endQuote: number = compilerPath.substr(1).search("\"") + 1;
+            if (endQuote !== -1) {
+                additionalArgs = compilerPath.substr(endQuote + 1).split(" ");
+                additionalArgs = additionalArgs.filter((arg: string) => { return arg.trim().length !== 0; }); // Remove empty args.
+                compilerPath = compilerPath.substr(1, endQuote - 1);
+            }
+        } else {
+            // Go from right to left checking if a valid path is to the left of a space.
+            let spaceStart: number = compilerPath.lastIndexOf(" ");
+            if (spaceStart !== -1 && (!isWindows || !compilerPath.endsWith("cl.exe")) && !checkFileExistsSync(compilerPath)) {
+                let potentialCompilerPath: string = compilerPath.substr(0, spaceStart);
+                while ((!isWindows || !potentialCompilerPath.endsWith("cl.exe")) && !checkFileExistsSync(potentialCompilerPath)) {
+                    spaceStart = potentialCompilerPath.lastIndexOf(" ");
+                    if (spaceStart === -1) {
+                        // Reached the start without finding a valid path. Use the original value.
+                        potentialCompilerPath = compilerPath;
+                        break;
+                    }
+                    potentialCompilerPath = potentialCompilerPath.substr(0, spaceStart);
+                }
+                if (compilerPath !== potentialCompilerPath) {
+                    // Found a valid compilerPath and args.
+                    additionalArgs = compilerPath.substr(spaceStart + 1).split(" ");
+                    additionalArgs = additionalArgs.filter((arg: string) => { return arg.trim().length !== 0; }); // Remove empty args.
+                    compilerPath = potentialCompilerPath;
+                }
+            }
+        }
+    }
+    return { compilerPath, additionalArgs };
 }
\ No newline at end of file
diff --git a/Extension/src/githubAPI.ts b/Extension/src/githubAPI.ts
index 56adc7c347..646d7ea9fe 100644
--- a/Extension/src/githubAPI.ts
+++ b/Extension/src/githubAPI.ts
@@ -9,6 +9,8 @@ import * as util from './common';
 import { PlatformInformation } from './platform';
 import { OutgoingHttpHeaders } from 'http';
 
+const testingInsidersVsixInstall: boolean = false; // Change this to true to enable testing of the Insiders vsix installation.
+
 /**
  * The object representation of a Build Asset. Each Asset corresponds to information about a release file on GitHub.
  */
@@ -139,7 +141,7 @@ export async function getTargetBuildInfo(updateChannel: string): Promise<BuildIn
             // Allows testing pre-releases without accidentally downgrading to the latest version
             const userVersion: PackageVersion = new PackageVersion(util.packageJson.version);
             const latestVersion: PackageVersion = new PackageVersion(builds[0].name);
-            if (userVersion.isGreaterThan(latestVersion) || (userVersion.suffix && userVersion.suffix !== 'insiders')) {
+            if (!testingInsidersVsixInstall && (userVersion.isGreaterThan(latestVersion) || (userVersion.suffix && userVersion.suffix !== 'insiders'))) {
                 return undefined;
             }
 
@@ -172,7 +174,7 @@ function getTargetBuild(builds: Build[], userVersion: PackageVersion, updateChan
     let needsUpdate: (installed: PackageVersion, target: PackageVersion) => boolean;
     let useBuild: (build: Build) => boolean;
     if (updateChannel === 'Insiders') {
-        needsUpdate = (installed: PackageVersion, target: PackageVersion) => { return target.isGreaterThan(installed); };
+        needsUpdate = (installed: PackageVersion, target: PackageVersion) => { return testingInsidersVsixInstall || target.isGreaterThan(installed); };
         useBuild = (build: Build): boolean => { return true; };
     } else if (updateChannel === 'Default') {
         needsUpdate = function(installed: PackageVersion, target: PackageVersion): boolean { return installed.isGreaterThan(target); };
@@ -189,7 +191,10 @@ function getTargetBuild(builds: Build[], userVersion: PackageVersion, updateChan
 
     // Check current version against target's version to determine if the installation should happen
     const targetVersion: PackageVersion = new PackageVersion(targetBuild.name);
-    return needsUpdate(userVersion, targetVersion) ? targetBuild : undefined;
+    if (needsUpdate(userVersion, targetVersion)) {
+        return targetBuild;
+    }
+    return undefined;
 }
 
 interface Rate {
@@ -201,7 +206,7 @@ interface RateLimit {
 }
 
 function isRate(input: any): input is Rate {
-    return input && input.remaining && util.isNumber(input.remaining);
+    return input && util.isNumber(input.remaining);
 }
 
 function isRateLimit(input: any): input is RateLimit {
@@ -212,7 +217,7 @@ async function getRateLimit(): Promise<RateLimit> {
     const header: OutgoingHttpHeaders = { 'User-Agent': 'vscode-cpptools' };
     const data: string = await util.downloadFileToStr('https://api.github.com/rate_limit', header)
         .catch((error) => {
-            if (error.code && error.code !== "ENOENT") {
+            if (error && error.code && error.code !== "ENOENT") {
                 // Only throw if the user is connected to the Internet.
                 throw new Error('Failed to download rate limit JSON');
             }
@@ -255,7 +260,7 @@ async function getReleaseJson(): Promise<Build[]> {
 
     const data: string = await util.downloadFileToStr(releaseUrl, header)
         .catch((error) => {
-            if (error.code && error.code !== "ENOENT") {
+            if (error && error.code && error.code !== "ENOENT") {
                 // Only throw if the user is connected to the Internet.
                 throw new Error('Failed to download release JSON');
             }
diff --git a/Extension/src/main.ts b/Extension/src/main.ts
index 039b595104..9aea33bbda 100644
--- a/Extension/src/main.ts
+++ b/Extension/src/main.ts
@@ -22,7 +22,7 @@ import { getInstallationInformation, InstallationInformation, setInstallationSta
 import { Logger, getOutputChannelLogger, showOutputChannel } from './logger';
 import { CppTools1 } from './cppTools1';
 
-const releaseNotesVersion: number = 3;
+const releaseNotesVersion: number = 4;
 const cppTools: CppTools1 = new CppTools1();
 let languageServiceDisabled: boolean = false;
 let reloadMessageShown: boolean = false;
@@ -35,7 +35,7 @@ export async function activate(context: vscode.ExtensionContext): Promise<CppToo
     util.setProgress(0);
 
     // Initialize the DebuggerExtension and register the related commands and providers.
-    DebuggerExtension.initialize();
+    DebuggerExtension.initialize(context);
 
     await processRuntimeDependencies();
 
@@ -329,6 +329,7 @@ function rewriteManifest(): Promise<void> {
         "onLanguage:c",
         "onCommand:extension.pickNativeProcess",
         "onCommand:extension.pickRemoteNativeProcess",
+        "onCommand:C_Cpp.BuildAndDebugActiveFile",
         "onCommand:C_Cpp.ConfigurationEdit",
         "onCommand:C_Cpp.ConfigurationSelect",
         "onCommand:C_Cpp.ConfigurationProviderSelect",
diff --git a/Extension/test/integrationTests/MockDebugger/debugAdapterDescriptorFactory.ts b/Extension/test/integrationTests/MockDebugger/debugAdapterDescriptorFactory.ts
new file mode 100644
index 0000000000..02a6fa5db9
--- /dev/null
+++ b/Extension/test/integrationTests/MockDebugger/debugAdapterDescriptorFactory.ts
@@ -0,0 +1,47 @@
+/* --------------------------------------------------------------------------------------------
+ * Copyright (c) Microsoft Corporation. All Rights Reserved.
+ * See 'LICENSE' in the project root for license information.
+ * ------------------------------------------------------------------------------------------ */
+
+import * as vscode from "vscode";
+import * as path from 'path';
+
+// import * as util from '../src/common' <- DO NOT USE. Also do not use anything with relative paths, it will break during replacing in test/integrationTests/debug/integration.test.ts
+
+abstract class AbstractDebugAdapterDescriptorFactory implements vscode.DebugAdapterDescriptorFactory {
+    protected readonly context: vscode.ExtensionContext;
+
+    constructor(context: vscode.ExtensionContext) {
+        this.context = context;
+    }
+
+    abstract createDebugAdapterDescriptor(session: vscode.DebugSession, executable: vscode.DebugAdapterExecutable | undefined): vscode.ProviderResult<vscode.DebugAdapterDescriptor>;
+}
+
+export class CppdbgDebugAdapterDescriptorFactory extends AbstractDebugAdapterDescriptorFactory {
+    public static DEBUG_TYPE : string = "cppdbg";
+
+    constructor(context: vscode.ExtensionContext) {
+        super(context);
+    }
+
+    createDebugAdapterDescriptor(session: vscode.DebugSession, executable: vscode.DebugAdapterExecutable | undefined): vscode.ProviderResult<vscode.DebugAdapterDescriptor> {
+        console.warn("This should only appear in a test scenario.");
+
+        return new vscode.DebugAdapterExecutable('node', [path.join(this.context.extensionPath, './out/test/integrationTests/MockDebugger/mockDebug.js')]);
+    }
+}
+
+export class CppvsdbgDebugAdapterDescriptorFactory extends AbstractDebugAdapterDescriptorFactory {
+    public static DEBUG_TYPE : string = "cppvsdbg";
+
+    constructor(context: vscode.ExtensionContext) {
+        super(context);
+    }
+
+    createDebugAdapterDescriptor(session: vscode.DebugSession, executable: vscode.DebugAdapterExecutable | undefined): vscode.ProviderResult<vscode.DebugAdapterDescriptor> {
+        console.warn("This should only appear in a test scenario.");
+
+        return new vscode.DebugAdapterExecutable('node', [path.join(this.context.extensionPath, './out/test/integrationTests/MockDebugger/mockDebug.js')]);
+    }
+}
\ No newline at end of file
diff --git a/Extension/test/integrationTests/MockDebugger/mockDebug.ts b/Extension/test/integrationTests/MockDebugger/mockDebug.ts
new file mode 100644
index 0000000000..20c5540fec
--- /dev/null
+++ b/Extension/test/integrationTests/MockDebugger/mockDebug.ts
@@ -0,0 +1,8 @@
+/* --------------------------------------------------------------------------------------------
+ * Copyright (c) Microsoft Corporation. All Rights Reserved.
+ * See 'LICENSE' in the project root for license information.
+ * ------------------------------------------------------------------------------------------ */
+
+import { MockDebugSession } from './mockDebugSession';
+
+MockDebugSession.run(MockDebugSession);
\ No newline at end of file
diff --git a/Extension/test/integrationTests/MockDebugger/mockDebugSession.ts b/Extension/test/integrationTests/MockDebugger/mockDebugSession.ts
new file mode 100644
index 0000000000..9ab5e577c6
--- /dev/null
+++ b/Extension/test/integrationTests/MockDebugger/mockDebugSession.ts
@@ -0,0 +1,67 @@
+/* --------------------------------------------------------------------------------------------
+ * Copyright (c) Microsoft Corporation. All Rights Reserved.
+ * See 'LICENSE' in the project root for license information.
+ * ------------------------------------------------------------------------------------------ */
+
+import { Logger, logger, LoggingDebugSession, InitializedEvent, TerminatedEvent } from 'vscode-debugadapter';
+import { DebugProtocol } from 'vscode-debugprotocol';
+import { Subject } from 'await-notify';
+
+interface LaunchRequestArguments extends DebugProtocol.LaunchRequestArguments {
+    /** An absolute path to the "program" to debug. */    
+    program: string;
+
+    /** enable logging the Debug Adapter Protocol */    
+    logPath?: string;
+}
+
+export class MockDebugSession extends LoggingDebugSession
+{
+	private _configurationDone = new Subject();
+
+    public constructor() {
+        super("mock-debug.txt");
+    }
+
+    protected initializeRequest(response: DebugProtocol.InitializeResponse, args: DebugProtocol.InitializeRequestArguments): void {
+		// build and return the capabilities of this debug adapter:
+		response.body = response.body || {};
+		
+		// the adapter implements the configurationDoneRequest.
+
+		response.body.supportsConfigurationDoneRequest = true;
+        
+		this.sendResponse(response);
+		// since this debug adapter can accept configuration requests like 'setBreakpoint' at any time,
+		// we request them early by sending an 'initializeRequest' to the frontend.
+		// The frontend will end the configuration sequence by calling 'configurationDone' request.
+		this.sendEvent(new InitializedEvent());
+
+	}
+
+	protected configurationDoneRequest(response: DebugProtocol.ConfigurationDoneResponse, args: DebugProtocol.ConfigurationDoneArguments): void {
+
+		super.configurationDoneRequest(response, args);
+		// notify the launchRequest that configuration has finished
+		this._configurationDone.notify();
+
+	}
+
+	protected async launchRequest(response: DebugProtocol.LaunchResponse, args: LaunchRequestArguments) {
+		// make sure to 'Stop' the buffered logging if 'trace' is not set
+		logger.setup(Logger.LogLevel.Verbose, args.logPath);
+		
+		// wait until configuration has finished (and configurationDoneRequest has been called)
+		await this._configurationDone.wait(1000);
+
+		this.sendResponse(response);
+
+		// Terminate after launch. 
+		this.sendEvent(new TerminatedEvent());
+	}
+
+	protected async disconnectRequest(response: DebugProtocol.DisconnectResponse, args: DebugProtocol.DisconnectArguments)
+	{
+		this.sendResponse(response);
+	}
+}
\ No newline at end of file
diff --git a/Extension/test/integrationTests/debug/index.ts b/Extension/test/integrationTests/debug/index.ts
new file mode 100644
index 0000000000..4b47377591
--- /dev/null
+++ b/Extension/test/integrationTests/debug/index.ts
@@ -0,0 +1,44 @@
+/* --------------------------------------------------------------------------------------------
+ * Copyright (c) Microsoft Corporation. All Rights Reserved.
+ * See 'LICENSE' in the project root for license information.
+ * ------------------------------------------------------------------------------------------ */
+
+
+import * as fs from "fs";
+import * as path from 'path';
+
+import { subscribeToAllLoggers } from "../../../src/logger";
+
+// 
+// PLEASE DO NOT MODIFY / DELETE UNLESS YOU KNOW WHAT YOU ARE DOING  
+//
+// This file is providing the test runner to use when running extension tests.
+// By default the test runner in use is Mocha based.
+// git status
+
+// You can provide your own test runner if you want to override it by exporting
+// a function run(testRoot: string, clb: (error:Error) => void) that the extension
+// host can call to run the tests. The test runner is expected to use console.log
+// to report the results back to the caller. When the tests are finished, return
+// a possible error to the callback or null if none.
+
+var testRunner = require('vscode/lib/testrunner');
+
+// You can directly control Mocha options by uncommenting the following lines
+// See https://github.com/mochajs/mocha/wiki/Using-mocha-programmatically#set-options for more info
+testRunner.configure({
+    ui: 'tdd', 		// the TDD UI is being used in *.test.ts (suite, test, etc.)
+    useColors: true, // colored output from test results
+    fullTrace: true,
+    timeout: 60000
+});
+
+const logFolder = path.join( __dirname, ".logs")
+
+if (!fs.existsSync(logFolder)) {
+    fs.mkdirSync(logFolder);
+}
+const logFilePath = path.join(logFolder, "integrationTests.log");
+subscribeToAllLoggers(message => fs.appendFileSync(logFilePath, message));
+
+module.exports = testRunner;
\ No newline at end of file
diff --git a/Extension/test/integrationTests/debug.integration.test.ts b/Extension/test/integrationTests/debug/integration.test.ts
similarity index 79%
rename from Extension/test/integrationTests/debug.integration.test.ts
rename to Extension/test/integrationTests/debug/integration.test.ts
index 434e35fd7d..dfe02e6212 100644
--- a/Extension/test/integrationTests/debug.integration.test.ts
+++ b/Extension/test/integrationTests/debug/integration.test.ts
@@ -7,14 +7,19 @@ import * as vscode from 'vscode';
 import * as assert from 'assert';
  
 suite(`Debug Integration Test: `, function(): void {
-    suiteSetup(async function(): Promise<void> { 
+    let origFactoryFile: string;
+    let tempFactoryFile: string;
+    let hijackedFactoryFile: string;
+
+    suiteSetup(async function(): Promise<void> {
         let extension: vscode.Extension<any> = vscode.extensions.getExtension("ms-vscode.cpptools"); 
         if (!extension.isActive) {
             await extension.activate(); 
         }
-    }); 
+    });
  
-    test("Starting (gdb) Launch from the workspace root should create an Active Debug Session", async () => { 
+    test("Starting (gdb) Launch from the workspace root should create an Active Debug Session", async function() { 
+        // If it is failing on startDebugging. Investigate the SimpleCppProject's tasks.json or launch.json.
         await vscode.debug.startDebugging(vscode.workspace.workspaceFolders[0], "(gdb) Launch");
 
         let debugSessionTerminated: Promise<void> = new Promise(resolve => {
diff --git a/Extension/test/integrationTests/index.ts b/Extension/test/integrationTests/languageServer/index.ts
similarity index 87%
rename from Extension/test/integrationTests/index.ts
rename to Extension/test/integrationTests/languageServer/index.ts
index ce27074f52..db359bda02 100644
--- a/Extension/test/integrationTests/index.ts
+++ b/Extension/test/integrationTests/languageServer/index.ts
@@ -7,7 +7,7 @@
 import * as fs from "fs";
 import * as path from 'path';
 
-import { subscribeToAllLoggers } from "../../src/logger";
+import { subscribeToAllLoggers } from "../../../src/logger";
 
 // 
 // PLEASE DO NOT MODIFY / DELETE UNLESS YOU KNOW WHAT YOU ARE DOING  
@@ -26,8 +26,9 @@ var testRunner = require('vscode/lib/testrunner');
 // You can directly control Mocha options by uncommenting the following lines
 // See https://github.com/mochajs/mocha/wiki/Using-mocha-programmatically#set-options for more info
 testRunner.configure({
-	ui: 'tdd', 		// the TDD UI is being used in extension.test.ts (suite, test, etc.)
-	useColors: true, // colored output from test results
+    ui: 'tdd', 		// the TDD UI is being used in *.test.ts (suite, test, etc.)
+    useColors: true, // colored output from test results
+    fullTrace: true,
     timeout: 60000
 });
 
diff --git a/Extension/test/integrationTests/languageServer.integration.test.ts b/Extension/test/integrationTests/languageServer/languageServer.integration.test.ts
similarity index 97%
rename from Extension/test/integrationTests/languageServer.integration.test.ts
rename to Extension/test/integrationTests/languageServer/languageServer.integration.test.ts
index 0a6e394084..ed863dc88c 100644
--- a/Extension/test/integrationTests/languageServer.integration.test.ts
+++ b/Extension/test/integrationTests/languageServer/languageServer.integration.test.ts
@@ -5,13 +5,13 @@
 
 import * as vscode from 'vscode';
 import * as assert from 'assert';
-import { getLanguageConfigFromPatterns } from '../../src/LanguageServer/languageConfig';
-import * as util from '../../src/common';
+import { getLanguageConfigFromPatterns } from '../../../src/LanguageServer/languageConfig';
+import * as util from '../../../src/common';
 import * as api from 'vscode-cpptools';
 import * as apit from 'vscode-cpptools/out/testApi';
-import * as config from '../../src/LanguageServer/configurations';
-import { CppSettings } from '../../src/LanguageServer/settings';
-import { getActiveClient } from '../../src/LanguageServer/extension';
+import * as config from '../../../src/LanguageServer/configurations';
+import { CppSettings } from '../../../src/LanguageServer/settings';
+import { getActiveClient } from '../../../src/LanguageServer/extension';
 
 suite("multiline comment setting tests", function(): void {
     suiteSetup(async function(): Promise<void> { 
diff --git a/Extension/test/integrationTests/testAssets/SimpleCppProject/.vscode/launch.json b/Extension/test/integrationTests/testAssets/SimpleCppProject/.vscode/launch.json
index 96c53dfe83..2063832cc4 100644
--- a/Extension/test/integrationTests/testAssets/SimpleCppProject/.vscode/launch.json
+++ b/Extension/test/integrationTests/testAssets/SimpleCppProject/.vscode/launch.json
@@ -5,15 +5,12 @@
             "name": "(gdb) Launch",
             "type": "cppdbg",
             "request": "launch",
-            "preLaunchTask": "build",
             "program": "${workspaceFolder}/program",
             "args": [],
             "stopAtEntry": false,
             "cwd": "${workspaceFolder}",
             "environment": [],
             "externalConsole": true,
-            "MIMode": "gdb",
-            "miDebuggerPath": "/usr/bin/gdb",
             "setupCommands": [
                 {
                     "description": "Enable pretty-printing for gdb",
@@ -22,10 +19,17 @@
                 }
             ],
             "windows": {
+                "MIMode": "gdb",
                 "miDebuggerPath": "C:\\MinGW\\bin\\gdb.exe"
             },
             "osx": {
-                "miDebuggerPath": "/usr/bin/lldb"
+                "MIMode": "lldb",
+                "preLaunchTask": "build"
+            },
+            "linux": {
+                "MIMode": "gdb",
+                "miDebuggerPath": "/usr/bin/gdb",
+                "preLaunchTask": "build"
             }
         }
     ]
diff --git a/Extension/tools/OptionsSchema.json b/Extension/tools/OptionsSchema.json
index 07163c7178..109e9f3aa6 100644
--- a/Extension/tools/OptionsSchema.json
+++ b/Extension/tools/OptionsSchema.json
@@ -345,12 +345,12 @@
           "anyOf": [
             {
               "type": "string",
-              "description": "Optional process id to attach the debugger to. Use \"${command:pickProcesss}\" to get a list of local running processes to attach to. Note that some platforms require administrator privileges in order to attach to a process.",
+              "description": "Optional process id to attach the debugger to. Use \"${command:pickProcess}\" to get a list of local running processes to attach to. Note that some platforms require administrator privileges in order to attach to a process.",
               "default": "${command:pickProcess}"
             },
             {
               "type": "integer",
-              "description": "Optional process id to attach the debugger to. Use \"${command:pickProcesss}\" to get a list of local running processes to attach to. Note that some platforms require administrator privileges in order to attach to a process.",
+              "description": "Optional process id to attach the debugger to. Use \"${command:pickProcess}\" to get a list of local running processes to attach to. Note that some platforms require administrator privileges in order to attach to a process.",
               "default": 0
             }
           ]
@@ -511,12 +511,12 @@
           "anyOf": [
             {
               "type": "string",
-              "description": "Optional process id to attach the debugger to. Use \"${command:pickProcesss}\" to get a list of local running processes to attach to. Note that some platforms require administrator privileges in order to attach to a process.",
+              "description": "Optional process id to attach the debugger to. Use \"${command:pickProcess}\" to get a list of local running processes to attach to. Note that some platforms require administrator privileges in order to attach to a process.",
               "default": "${command:pickProcess}"
             },
             {
               "type": "integer",
-              "description": "Optional process id to attach the debugger to. Use \"${command:pickProcesss}\" to get a list of local running processes to attach to. Note that some platforms require administrator privileges in order to attach to a process.",
+              "description": "Optional process id to attach the debugger to. Use \"${command:pickProcess}\" to get a list of local running processes to attach to. Note that some platforms require administrator privileges in order to attach to a process.",
               "default": 0
             }
           ]
diff --git a/azure-pipelines.yml b/azure-pipelines.yml
new file mode 100644
index 0000000000..6e4aca13be
--- /dev/null
+++ b/azure-pipelines.yml
@@ -0,0 +1,17 @@
+name: $(Date:yyyyMMdd).$(Rev:.r)
+pr: 
+- 'master'
+jobs:
+- template: Extension/jobs/build.yml
+  parameters:
+    name: macOS
+    pool:
+      vmImage: 'macOS-10.13'
+
+- template: Extension/jobs/build.yml
+  parameters:
+    name: Linux
+    pool:
+      vmImage: 'ubuntu-16.04'
+
+- template: Extension/jobs/build.windows.yml
\ No newline at end of file