Move Bazel code from iree/ into build_tools/bazel/. (iree-org#9149)

Progress on iree-org#8955. After this, the `iree/` directory will only contain the `test/` subdirectory, with minimal supporting build/test system files.

* Move iree/build_defs.oss.bzl to build_tools/bazel/. 
  Also alphabetized load() statements and added copyright headers to files that were missing them.
* Move config_settings from iree/BUILD.bazel to build_tools/bazel/. 
  Also cleaned up some related Bazel files.
* Set Bazel's default lit.cfg.py from //iree to //iree/test. 
  Compiler/ overrides it as needed. Only iree/test/ relies on the default.

Author: ScottTodd

BUILD.bazel

@@ -4,24 +4,6 @@
 # See https://llvm.org/LICENSE.txt for license information.
 # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 
-# Note that project-wide, bazel repo aliases are used. Various scripts and helpers operate on the
-# following prefixes textually, so avoid doing any systematic construction that would break the
-# matching.
-#
-#  "@absl_py//absl/"
-#  "@bazel_skylib//"
-#  "@com_google_benchmark//"
-#  "@cpuinfo//"
-#  "@cuda//"
-#  "@com_github_dvidelabs_flatcc//"
-#  "@com_google_googletest//"
-#  "@llvm-project//"
-#  "@mlir-hlo//"
-#  "@iree_pybind11//"
-#  "@spirv_cross//"
-#  "@vulkan_headers//"
-#  "@com_github_yaml_libyaml//"
-
 package(
     default_visibility = ["//visibility:public"],
     features = ["layering_check"],

build_tools/BUILD

@@ -15,8 +15,8 @@ package(
 cc_library(
     name = "default_linkopts",
     linkopts = select({
-        "//iree:iree_is_msvc": [],
-        "//iree:iree_is_android": [
+        "//build_tools/bazel:iree_is_msvc": [],
+        "//build_tools/bazel:iree_is_android": [
             # Android provides its own pthreads support with no linking required.
         ],
         "//conditions:default": [
@@ -29,8 +29,8 @@ cc_library(
 cc_library(
     name = "dl",
     linkopts = select({
-        "//iree:iree_is_msvc": [],
-        "//iree:iree_is_android": [
+        "//build_tools/bazel:iree_is_msvc": [],
+        "//build_tools/bazel:iree_is_android": [
             "-ldl",
         ],
         "//conditions:default": [

iree/BUILD.bazel build_tools/bazel/BUILD.bazeliree/BUILD.bazel renamed to build_tools/bazel/BUILD.bazel

@@ -4,30 +4,12 @@
 # See https://llvm.org/LICENSE.txt for license information.
 # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 
-# Main IREE build file.
-
 package(
     default_visibility = ["//visibility:public"],
     features = ["layering_check"],
     licenses = ["notice"],  # Apache 2.0
 )
 
-exports_files(["lit.cfg.py"])
-
-# Enables the debug service and other profiling features.
-# $ bazel build --define=IREE_DEBUG=1 :some_target
-config_setting(
-    name = "debug",
-    define_values = {"IREE_DEBUG": "1"},
-)
-
-config_setting(
-    name = "enable_tensorflow",
-    define_values = {
-        "iree_tensorflow": "true",
-    },
-)
-
 # Note that the "proper" way to do this is via a query on @bazel_tools,
 # but as with so many things bazel, it doesn't work reliably across versions,
 # variants, etc. So we just define our own since we also own the config

iree/build_defs.oss.bzl build_tools/bazel/build_defs.oss.bzliree/build_defs.oss.bzl renamed to build_tools/bazel/build_defs.oss.bzl

@@ -10,7 +10,7 @@ load(":lit_test.bzl", "lit_test", "lit_test_suite")
 
 def iree_lit_test(
         name,
-        cfg = "//iree:lit.cfg.py",
+        cfg = "//iree/test:lit.cfg.py",
         tools = None,
         env = None,
         **kwargs):
@@ -54,7 +54,7 @@ def iree_lit_test(
 
 def iree_lit_test_suite(
         name,
-        cfg = "//iree:lit.cfg.py",
+        cfg = "//iree/test:lit.cfg.py",
         tools = None,
         env = None,
         **kwargs):

build_tools/bazel/iree_lit_test.bzl

@@ -1,7 +1,10 @@
-# NOTE: This must be BUILD.bazel (not BUILD) because otherwise, you can't
-# build python packages in this directory (which creates "build" directories)
-# on case-inensitive file systems.
-load("//iree:build_defs.oss.bzl", "iree_compiler_cc_library")
+# Copyright 2022 The IREE Authors
+#
+# Licensed under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+
+load("//build_tools/bazel:build_defs.oss.bzl", "iree_compiler_cc_library")
 
 package(
     default_visibility = ["//visibility:public"],

compiler/src/iree/compiler/API/BUILD

@@ -4,7 +4,7 @@
 # See https://llvm.org/LICENSE.txt for license information.
 # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 
-load("//iree:build_defs.oss.bzl", "iree_compiler_cc_library")
+load("//build_tools/bazel:build_defs.oss.bzl", "iree_compiler_cc_library")
 
 package(
     default_visibility = ["//visibility:public"],

compiler/src/iree/compiler/Bindings/Native/Transforms/BUILD

@@ -4,7 +4,7 @@
 # See https://llvm.org/LICENSE.txt for license information.
 # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 
-load("//iree:build_defs.oss.bzl", "iree_compiler_cc_library")
+load("//build_tools/bazel:build_defs.oss.bzl", "iree_compiler_cc_library")
 
 package(
     default_visibility = ["//visibility:public"],

compiler/src/iree/compiler/Bindings/TFLite/Transforms/BUILD

@@ -4,7 +4,7 @@
 # See https://llvm.org/LICENSE.txt for license information.
 # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 
-load("//iree:build_defs.oss.bzl", "iree_compiler_cc_library")
+load("//build_tools/bazel:build_defs.oss.bzl", "iree_compiler_cc_library")
 load("//build_tools/bazel:iree_tablegen.bzl", "iree_gentbl_cc_library")
 
 package(

compiler/src/iree/compiler/Codegen/BUILD

@@ -4,7 +4,7 @@
 # See https://llvm.org/LICENSE.txt for license information.
 # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 
-load("//iree:build_defs.oss.bzl", "iree_compiler_cc_library")
+load("//build_tools/bazel:build_defs.oss.bzl", "iree_compiler_cc_library")
 load("//build_tools/bazel:iree_tablegen.bzl", "iree_gentbl_cc_library")
 
 package(