Improper IntelliSense Mode when cross compiling for PowerPC

[jastich]

Background: We are using clang to cross compile for a PowerPC target running VxWorks. Because we also compile the same code files for x86 Linux, our codebase makes wide use of #ifdef __linux__ statements to supply alternative implementations for Linux in some places. We are using the C/C++ extension with CMake Tools as the configuration provider.

Problem: IntelliSense is choosing the code within the #ifdef __linux__ code blocks when it should be selecting the code for the PowerPC target instead.

IntelliSense is finding our PPC compiler correctly, but falls back to using linux-clang-x64 IntelliSense mode. I suspect this is causing the define __linux__ = 1 and IntelliSense is choosing the wrong code when it should be indexing for our PowerPC target.

I inspected the list of IntelliSense providers, but most of them target x86, x86-64, or ARM with various operating systems. None of these seem to be generic. How can we avoid the definitions supplied by the fallback IntelliSense mode?

From C/C++ Diagnostics of a particular file:

Translation Unit Mappings:
[ redacted.cpp ]:
    redacted.cpp
Translation Unit Configurations:
[ redacted.cpp ]:
    Process ID: 5432
    Memory Usage: 201 MB
    Compiler Path: ...redacted.../bin/clang++
    Includes:
        ... redacted ...
    Defines:
        ... redacted (does not include __linux__ = 1) ...
    Forced Includes:
        ... redacted ...
    Standard Version: c++14
    IntelliSense Mode: linux-clang-x64
    Other Flags:
        --clang
        --clang_version=130001
Total Memory Usage: 201 MB

From C/C++ log:

Compiler query command line: /...redacted_path.../bin/clang++ -O3 -fno-builtin -fno-strict-aliasing -fsigned-char -mlongcall -fasm -fno-asynchronous-unwind-tables -fno-unwind-tables -mcpu=8548 -msecure-plt -Wall -nostdlibinc -nostdinc++ --target=ppc32 -O2 -mlong-double-64 -mhard-float -std=c++14 -Wp,-v -fno-blocks -E -dM -x c++ /dev/null

Output of running the compiler query command line above:

#include "..." search starts here:
#include <...> search starts here:
 /...redacted.../compilers/lib/clang/13.0.1.3/include
End of search list.
#define _ARCH_PPC 1
#define _BIG_ENDIAN 1
#define _ILP32 1
#define __ATOMIC_ACQUIRE 2
#define __ATOMIC_ACQ_REL 4
#define __ATOMIC_CONSUME 1
#define __ATOMIC_RELAXED 0
#define __ATOMIC_RELEASE 3
#define __ATOMIC_SEQ_CST 5
#define __BIGGEST_ALIGNMENT__ 16
#define __BIG_ENDIAN__ 1
#define __BYTE_ORDER__ __ORDER_BIG_ENDIAN__
#define __CHAR16_TYPE__ unsigned short
#define __CHAR32_TYPE__ unsigned int
#define __CHAR_BIT__ 8
#define __CLANG_ATOMIC_BOOL_LOCK_FREE 2
#define __CLANG_ATOMIC_CHAR16_T_LOCK_FREE 2
#define __CLANG_ATOMIC_CHAR32_T_LOCK_FREE 2
#define __CLANG_ATOMIC_CHAR_LOCK_FREE 2
#define __CLANG_ATOMIC_INT_LOCK_FREE 2
#define __CLANG_ATOMIC_LLONG_LOCK_FREE 1
#define __CLANG_ATOMIC_LONG_LOCK_FREE 2
#define __CLANG_ATOMIC_POINTER_LOCK_FREE 2
#define __CLANG_ATOMIC_SHORT_LOCK_FREE 2
#define __CLANG_ATOMIC_WCHAR_T_LOCK_FREE 2
#define __CONSTANT_CFSTRINGS__ 1
#define __DBL_DECIMAL_DIG__ 17
#define __DBL_DENORM_MIN__ 4.9406564584124654e-324
#define __DBL_DIG__ 15
#define __DBL_EPSILON__ 2.2204460492503131e-16
#define __DBL_HAS_DENORM__ 1
#define __DBL_HAS_INFINITY__ 1
#define __DBL_HAS_QUIET_NAN__ 1
#define __DBL_MANT_DIG__ 53
#define __DBL_MAX_10_EXP__ 308
#define __DBL_MAX_EXP__ 1024
#define __DBL_MAX__ 1.7976931348623157e+308
#define __DBL_MIN_10_EXP__ (-307)
#define __DBL_MIN_EXP__ (-1021)
#define __DBL_MIN__ 2.2250738585072014e-308
#define __DECIMAL_DIG__ __LDBL_DECIMAL_DIG__
#define __DEPRECATED 1
#define __EXCEPTIONS 1
#define __FINITE_MATH_ONLY__ 0
#define __FLT_DECIMAL_DIG__ 9
#define __FLT_DENORM_MIN__ 1.40129846e-45F
#define __FLT_DIG__ 6
#define __FLT_EPSILON__ 1.19209290e-7F
#define __FLT_EVAL_METHOD__ 0
#define __FLT_HAS_DENORM__ 1
#define __FLT_HAS_INFINITY__ 1
#define __FLT_HAS_QUIET_NAN__ 1
#define __FLT_MANT_DIG__ 24
#define __FLT_MAX_10_EXP__ 38
#define __FLT_MAX_EXP__ 128
#define __FLT_MAX__ 3.40282347e+38F
#define __FLT_MIN_10_EXP__ (-37)
#define __FLT_MIN_EXP__ (-125)
#define __FLT_MIN__ 1.17549435e-38F
#define __FLT_RADIX__ 2
#define __GCC_ATOMIC_BOOL_LOCK_FREE 2
#define __GCC_ATOMIC_CHAR16_T_LOCK_FREE 2
#define __GCC_ATOMIC_CHAR32_T_LOCK_FREE 2
#define __GCC_ATOMIC_CHAR_LOCK_FREE 2
#define __GCC_ATOMIC_INT_LOCK_FREE 2
#define __GCC_ATOMIC_LLONG_LOCK_FREE 1
#define __GCC_ATOMIC_LONG_LOCK_FREE 2
#define __GCC_ATOMIC_POINTER_LOCK_FREE 2
#define __GCC_ATOMIC_SHORT_LOCK_FREE 2
#define __GCC_ATOMIC_TEST_AND_SET_TRUEVAL 1
#define __GCC_ATOMIC_WCHAR_T_LOCK_FREE 2
#define __GCC_HAVE_DWARF2_CFI_ASM 1
#define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_1 1
#define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_2 1
#define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4 1
#define __GNUC_GNU_INLINE__ 1
#define __GNUC_MINOR__ 2
#define __GNUC_PATCHLEVEL__ 1
#define __GNUC__ 4
#define __GNUG__ 4
#define __GXX_ABI_VERSION 1002
#define __GXX_EXPERIMENTAL_CXX0X__ 1
#define __GXX_RTTI 1
#define __GXX_WEAK__ 1
#define __HAVE_BSWAP__ 1
#define __ILP32__ 1
#define __INT16_C_SUFFIX__ 
#define __INT16_FMTd__ "hd"
#define __INT16_FMTi__ "hi"
#define __INT16_MAX__ 32767
#define __INT16_TYPE__ short
#define __INT32_C_SUFFIX__ 
#define __INT32_FMTd__ "d"
#define __INT32_FMTi__ "i"
#define __INT32_MAX__ 2147483647
#define __INT32_TYPE__ int
#define __INT64_C_SUFFIX__ LL
#define __INT64_FMTd__ "lld"
#define __INT64_FMTi__ "lli"
#define __INT64_MAX__ 9223372036854775807LL
#define __INT64_TYPE__ long long int
#define __INT8_C_SUFFIX__ 
#define __INT8_FMTd__ "hhd"
#define __INT8_FMTi__ "hhi"
#define __INT8_MAX__ 127
#define __INT8_TYPE__ signed char
#define __INTMAX_C_SUFFIX__ LL
#define __INTMAX_FMTd__ "lld"
#define __INTMAX_FMTi__ "lli"
#define __INTMAX_MAX__ 9223372036854775807LL
#define __INTMAX_TYPE__ long long int
#define __INTMAX_WIDTH__ 64
#define __INTPTR_FMTd__ "d"
#define __INTPTR_FMTi__ "i"
#define __INTPTR_MAX__ 2147483647
#define __INTPTR_TYPE__ int
#define __INTPTR_WIDTH__ 32
#define __INT_FAST16_FMTd__ "hd"
#define __INT_FAST16_FMTi__ "hi"
#define __INT_FAST16_MAX__ 32767
#define __INT_FAST16_TYPE__ short
#define __INT_FAST32_FMTd__ "d"
#define __INT_FAST32_FMTi__ "i"
#define __INT_FAST32_MAX__ 2147483647
#define __INT_FAST32_TYPE__ int
#define __INT_FAST64_FMTd__ "lld"
#define __INT_FAST64_FMTi__ "lli"
#define __INT_FAST64_MAX__ 9223372036854775807LL
#define __INT_FAST64_TYPE__ long long int
#define __INT_FAST8_FMTd__ "hhd"
#define __INT_FAST8_FMTi__ "hhi"
#define __INT_FAST8_MAX__ 127
#define __INT_FAST8_TYPE__ signed char
#define __INT_LEAST16_FMTd__ "hd"
#define __INT_LEAST16_FMTi__ "hi"
#define __INT_LEAST16_MAX__ 32767
#define __INT_LEAST16_TYPE__ short
#define __INT_LEAST32_FMTd__ "d"
#define __INT_LEAST32_FMTi__ "i"
#define __INT_LEAST32_MAX__ 2147483647
#define __INT_LEAST32_TYPE__ int
#define __INT_LEAST64_FMTd__ "lld"
#define __INT_LEAST64_FMTi__ "lli"
#define __INT_LEAST64_MAX__ 9223372036854775807LL
#define __INT_LEAST64_TYPE__ long long int
#define __INT_LEAST8_FMTd__ "hhd"
#define __INT_LEAST8_FMTi__ "hhi"
#define __INT_LEAST8_MAX__ 127
#define __INT_LEAST8_TYPE__ signed char
#define __INT_MAX__ 2147483647
#define __LDBL_DECIMAL_DIG__ 17
#define __LDBL_DENORM_MIN__ 4.9406564584124654e-324L
#define __LDBL_DIG__ 15
#define __LDBL_EPSILON__ 2.2204460492503131e-16L
#define __LDBL_HAS_DENORM__ 1
#define __LDBL_HAS_INFINITY__ 1
#define __LDBL_HAS_QUIET_NAN__ 1
#define __LDBL_MANT_DIG__ 53
#define __LDBL_MAX_10_EXP__ 308
#define __LDBL_MAX_EXP__ 1024
#define __LDBL_MAX__ 1.7976931348623157e+308L
#define __LDBL_MIN_10_EXP__ (-307)
#define __LDBL_MIN_EXP__ (-1021)
#define __LDBL_MIN__ 2.2250738585072014e-308L
#define __LONG_LONG_MAX__ 9223372036854775807LL
#define __LONG_MAX__ 2147483647L
#define __NATURAL_ALIGNMENT__ 1
#define __NO_FPRS__ 1
#define __NO_LWSYNC__ 1
#define __OBJC_BOOL_IS_BOOL 0
#define __OPENCL_MEMORY_SCOPE_ALL_SVM_DEVICES 3
#define __OPENCL_MEMORY_SCOPE_DEVICE 2
#define __OPENCL_MEMORY_SCOPE_SUB_GROUP 4
#define __OPENCL_MEMORY_SCOPE_WORK_GROUP 1
#define __OPENCL_MEMORY_SCOPE_WORK_ITEM 0
#define __OPTIMIZE__ 1
#define __ORDER_BIG_ENDIAN__ 4321
#define __ORDER_LITTLE_ENDIAN__ 1234
#define __ORDER_PDP_ENDIAN__ 3412
#define __POINTER_WIDTH__ 32
#define __POWERPC__ 1
#define __PPC__ 1
#define __PRAGMA_REDEFINE_EXTNAME 1
#define __PTRDIFF_FMTd__ "d"
#define __PTRDIFF_FMTi__ "i"
#define __PTRDIFF_MAX__ 2147483647
#define __PTRDIFF_TYPE__ int
#define __PTRDIFF_WIDTH__ 32
#define __REGISTER_PREFIX__ 
#define __SCHAR_MAX__ 127
#define __SHRT_MAX__ 32767
#define __SIG_ATOMIC_MAX__ 2147483647
#define __SIG_ATOMIC_WIDTH__ 32
#define __SIZEOF_DOUBLE__ 8
#define __SIZEOF_FLOAT__ 4
#define __SIZEOF_INT__ 4
#define __SIZEOF_LONG_DOUBLE__ 8
#define __SIZEOF_LONG_LONG__ 8
#define __SIZEOF_LONG__ 4
#define __SIZEOF_POINTER__ 4
#define __SIZEOF_PTRDIFF_T__ 4
#define __SIZEOF_SHORT__ 2
#define __SIZEOF_SIZE_T__ 4
#define __SIZEOF_WCHAR_T__ 4
#define __SIZEOF_WINT_T__ 4
#define __SIZE_FMTX__ "X"
#define __SIZE_FMTo__ "o"
#define __SIZE_FMTu__ "u"
#define __SIZE_FMTx__ "x"
#define __SIZE_MAX__ 4294967295U
#define __SIZE_TYPE__ unsigned int
#define __SIZE_WIDTH__ 32
#define __SPE__ 1
#define __STDCPP_DEFAULT_NEW_ALIGNMENT__ 8U
#define __STDCPP_THREADS__ 1
#define __STDC_HOSTED__ 1
#define __STDC_UTF_16__ 1
#define __STDC_UTF_32__ 1
#define __STDC__ 1
#define __STRICT_ANSI__ 1
#define __UINT16_C_SUFFIX__ 
#define __UINT16_FMTX__ "hX"
#define __UINT16_FMTo__ "ho"
#define __UINT16_FMTu__ "hu"
#define __UINT16_FMTx__ "hx"
#define __UINT16_MAX__ 65535
#define __UINT16_TYPE__ unsigned short
#define __UINT32_C_SUFFIX__ U
#define __UINT32_FMTX__ "X"
#define __UINT32_FMTo__ "o"
#define __UINT32_FMTu__ "u"
#define __UINT32_FMTx__ "x"
#define __UINT32_MAX__ 4294967295U
#define __UINT32_TYPE__ unsigned int
#define __UINT64_C_SUFFIX__ ULL
#define __UINT64_FMTX__ "llX"
#define __UINT64_FMTo__ "llo"
#define __UINT64_FMTu__ "llu"
#define __UINT64_FMTx__ "llx"
#define __UINT64_MAX__ 18446744073709551615ULL
#define __UINT64_TYPE__ long long unsigned int
#define __UINT8_C_SUFFIX__ 
#define __UINT8_FMTX__ "hhX"
#define __UINT8_FMTo__ "hho"
#define __UINT8_FMTu__ "hhu"
#define __UINT8_FMTx__ "hhx"
#define __UINT8_MAX__ 255
#define __UINT8_TYPE__ unsigned char
#define __UINTMAX_C_SUFFIX__ ULL
#define __UINTMAX_FMTX__ "llX"
#define __UINTMAX_FMTo__ "llo"
#define __UINTMAX_FMTu__ "llu"
#define __UINTMAX_FMTx__ "llx"
#define __UINTMAX_MAX__ 18446744073709551615ULL
#define __UINTMAX_TYPE__ long long unsigned int
#define __UINTMAX_WIDTH__ 64
#define __UINTPTR_FMTX__ "X"
#define __UINTPTR_FMTo__ "o"
#define __UINTPTR_FMTu__ "u"
#define __UINTPTR_FMTx__ "x"
#define __UINTPTR_MAX__ 4294967295U
#define __UINTPTR_TYPE__ unsigned int
#define __UINTPTR_WIDTH__ 32
#define __UINT_FAST16_FMTX__ "hX"
#define __UINT_FAST16_FMTo__ "ho"
#define __UINT_FAST16_FMTu__ "hu"
#define __UINT_FAST16_FMTx__ "hx"
#define __UINT_FAST16_MAX__ 65535
#define __UINT_FAST16_TYPE__ unsigned short
#define __UINT_FAST32_FMTX__ "X"
#define __UINT_FAST32_FMTo__ "o"
#define __UINT_FAST32_FMTu__ "u"
#define __UINT_FAST32_FMTx__ "x"
#define __UINT_FAST32_MAX__ 4294967295U
#define __UINT_FAST32_TYPE__ unsigned int
#define __UINT_FAST64_FMTX__ "llX"
#define __UINT_FAST64_FMTo__ "llo"
#define __UINT_FAST64_FMTu__ "llu"
#define __UINT_FAST64_FMTx__ "llx"
#define __UINT_FAST64_MAX__ 18446744073709551615ULL
#define __UINT_FAST64_TYPE__ long long unsigned int
#define __UINT_FAST8_FMTX__ "hhX"
#define __UINT_FAST8_FMTo__ "hho"
#define __UINT_FAST8_FMTu__ "hhu"
#define __UINT_FAST8_FMTx__ "hhx"
#define __UINT_FAST8_MAX__ 255
#define __UINT_FAST8_TYPE__ unsigned char
#define __UINT_LEAST16_FMTX__ "hX"
#define __UINT_LEAST16_FMTo__ "ho"
#define __UINT_LEAST16_FMTu__ "hu"
#define __UINT_LEAST16_FMTx__ "hx"
#define __UINT_LEAST16_MAX__ 65535
#define __UINT_LEAST16_TYPE__ unsigned short
#define __UINT_LEAST32_FMTX__ "X"
#define __UINT_LEAST32_FMTo__ "o"
#define __UINT_LEAST32_FMTu__ "u"
#define __UINT_LEAST32_FMTx__ "x"
#define __UINT_LEAST32_MAX__ 4294967295U
#define __UINT_LEAST32_TYPE__ unsigned int
#define __UINT_LEAST64_FMTX__ "llX"
#define __UINT_LEAST64_FMTo__ "llo"
#define __UINT_LEAST64_FMTu__ "llu"
#define __UINT_LEAST64_FMTx__ "llx"
#define __UINT_LEAST64_MAX__ 18446744073709551615ULL
#define __UINT_LEAST64_TYPE__ long long unsigned int
#define __UINT_LEAST8_FMTX__ "hhX"
#define __UINT_LEAST8_FMTo__ "hho"
#define __UINT_LEAST8_FMTu__ "hhu"
#define __UINT_LEAST8_FMTx__ "hhx"
#define __UINT_LEAST8_MAX__ 255
#define __UINT_LEAST8_TYPE__ unsigned char
#define __USER_LABEL_PREFIX__ 
#define __VERSION__ "Clang 13.0.1.3 (http://bitbucket.wrs.com/scm/llvm/clang.git 9f9e687a4918b131f3d7364e10acec341a0b49f8) (http://bitbucket.wrs.com/scm/llvm/llvm.git eceda2023923c1632158f3ba0a6f8fbe4308c420)"
#define __WCHAR_MAX__ 2147483647
#define __WCHAR_TYPE__ int
#define __WCHAR_WIDTH__ 32
#define __WINT_MAX__ 2147483647
#define __WINT_TYPE__ int
#define __WINT_WIDTH__ 32
#define __clang__ 1
#define __clang_literal_encoding__ "UTF-8"
#define __clang_major__ 13
#define __clang_minor__ 0
#define __clang_patchlevel__ 1
#define __clang_version__ "13.0.1.3 (http://bitbucket.wrs.com/scm/llvm/clang.git 9f9e687a4918b131f3d7364e10acec341a0b49f8) (http://bitbucket.wrs.com/scm/llvm/llvm.git eceda2023923c1632158f3ba0a6f8fbe4308c420)"
#define __clang_wide_literal_encoding__ "UTF-32"
#define __cplusplus 201402L
#define __cpp_aggregate_nsdmi 201304L
#define __cpp_alias_templates 200704L
#define __cpp_attributes 200809L
#define __cpp_binary_literals 201304L
#define __cpp_constexpr 201304L
#define __cpp_constexpr_in_decltype 201711L
#define __cpp_decltype 200707L
#define __cpp_decltype_auto 201304L
#define __cpp_delegating_constructors 200604L
#define __cpp_digit_separators 201309L
#define __cpp_exceptions 199711L
#define __cpp_generic_lambdas 201304L
#define __cpp_impl_destroying_delete 201806L
#define __cpp_inheriting_constructors 201511L
#define __cpp_init_captures 201304L
#define __cpp_initializer_lists 200806L
#define __cpp_lambdas 200907L
#define __cpp_nsdmi 200809L
#define __cpp_range_based_for 200907
#define __cpp_raw_strings 200710L
#define __cpp_ref_qualifiers 200710L
#define __cpp_return_type_deduction 201304L
#define __cpp_rtti 199711L
#define __cpp_rvalue_references 200610L
#define __cpp_static_assert 200410
#define __cpp_threadsafe_static_init 200806L
#define __cpp_unicode_characters 200704L
#define __cpp_unicode_literals 200710L
#define __cpp_user_defined_literals 200809L
#define __cpp_variable_templates 201304L
#define __cpp_variadic_templates 200704L
#define __llvm__ 1
#define __powerpc__ 1
#define __ppc__ 1
#define __private_extern__ extern```

[sean-mcmanus]

@jastich What is the initial IntelliSense mode before it falls back to linux-clang-x64? Have you tried windows-clang-x86? We have a fix pending for 1.14.2 for handling the 32-bitness of the ppc32 target, but we're not sure if that resolve this issue or not.

If you set "C_Cpp.loggingLevel" to debug, that logging related to the IntelliSense modes might be helpful.

[sean-mcmanus]

Any IntelliSense mode that starts with "linux" will have __linux__ defined. It's not accepting the "windows-clang-x86" IntelliSense mode because it's detecting "/usr/bin/gcc" as the compilerPath -- can you set compilerPath to "" or some compiler that doesn't define __unix__? That works for me. We have another issue at #4653 tracking improving the scenario in case the Windows mode also doesn't work for you. If you're using a configuration provider, there might be some way to get it send a non-linux IntelliSense mode.

[jastich]

I modified the settings.json of the workspace to explicitly set:

"C_Cpp.default.configurationProvider": "ms-vscode.cmake-tools"

and now neither the C_Cpp.default.intelliSenseMode nor C_Cpp.default.compilerPath has any effect.

I can't find any way to customize how CMake Tools interfaces with IntelliSense.

#4653 sounds like a must have for us.

[KB3HNS]

@jastich FYI, I've been hitting this same problem (maybe you and I are actually working on the same problem???) - either way, if you are using a configuration provider, all other settings are ignored. I have upvoted your linked issue and have also requested that the "merge configuration" flag be allowed to add additional items to the Intellisense parser that CMake is not giving it.

[debugee]

when useFragments ==true,
cmake tool set intelliSenseMode=undefined (see function buildConfigurationData in cpptools.ts in cmake-tools source)
and then send command to cpptool bin (server) did......change/did configure ...
and then vscode-cpptools js ext recv cpptools/debugLog intelliSenseMode=xxxxx
xxxxx is the cpptools bin select mode, but error when cross-compiling use cmake-tools
when "configurationProvider": "ms-vscode.cmake-tools"
"intelliSenseMode": "windows-clang-x64" will invalid in c_cpp_properties.json
and then bug come out

[debugee]

you can set like this
{
"configurations": [
{
"name": "llvm-mingw",
"cppStandard": "c++17",
"cStandard": "c17",
"intelliSenseMode": "windows-clang-x64",
"compileCommands": "${workspaceFolder}/build/compile_commands.json"
}
],
"version": 4
}
intelliSenseMode you set is selected
compileCommands is cmake create file, compiler and arg in it

I use this from macOS compile windows execution file
vscode-cpptool work good!