clang-tidy generating 'use of undeclared identifier'

[jalanh11640]

My apologies if this question doesn't belong here.

I have clang-tidy setup. When I run it, it reports numerous 'use of undeclared identifier' errors. The code in question compiles (with gcc) and runs without issue. Here's a sampling of the errors. (I couldn't find a way to copy all the errors)

ia32intrin.h[Ln 41, Col 10]: use of undeclared identifier '__builtin_ia32_bsrsi'
ia32intrin.h[Ln 122, Col 10]: use of undeclared identifier '__builtin_ia32_rolqi'; did you mean '__builtin_ia32_korqi'?
ia32intrin.h[Ln 127, Col 19]: use of undeclared identifier '__builtin_ia32_addss'

I did find #9898 which seems to address a similar issue, but using "--extra-arg=-mno-sse2" doesn't change anything. Not to mention I'm using 1.18.1 which seems as if it should incorporate the fix.

Any suggestions how to resolve this?

Thanks,
Jeff

[sean-mcmanus]

clang-tidy/clang doesn't understand those __builtin identifiers so in order to get it to work something in the configuration needs to be set such that clang-tidy/clang doesn't see those. Whether it's fixable or not depends on how the ia32intrin.h is defined, i.e. what #if are used to determine if the __builtin should be used or not, so if you check that header you may be able to find a workaround. Or if you can provide more repro info, we could try to investigate ourselves.

[jalanh11640]

I've been able to pare the issue down to something I can share that maybe someone else can repro.

VSCode version: 1.84.0 (On a mac if it matters, but using Remote-SSH)
C/C++ Extension: 1.18.4
Remote-SSH Extension: v0.107.0
gcc version: 4.9.4
Google Test: 1.10.0

test.cpp:
#include <gmock/gmock.h>
// end of file

c_cpp_properties.json configuration:

        {
            "name": "gtest",
            "includePath": [
                "/usr/local/googletest/include"
            ],
            "defines": [
            ],
            "compilerPath": "/usr/local/gcc-4.9.4/bin/g++",
            "cppStandard": "c++11",
            "intelliSenseMode": "linux-gcc-x86",
            "browse": {
                "limitSymbolsToIncludedHeaders": true,
                "path": [
                    "${workspaceFolder}"
                ],
                "databaseFilename": "${workspaceFolder}/.vscode/db/vc.db"
            },
            "compilerArgs": [
            ]
        }

clang-tidy command line:

/homedir/.vscode-server/extensions/ms-vscode.cpptools-1.18.4/bin/../LLVM/bin/clang-tidy
--checks=bugprone-*,clang-analyzer-*,performance-*
--header-filter=.*
--extra-arg=-m32
--export-fixes=/tmp/{13036246006677400413}/fixes140076204243760.yaml
--quiet
--use-color=false
/homedir/build/test.cpp
--
-std=c++11
-xc++
-Wno-pragma-pack
-Wno-pragma-once-outside-header
-D__DBL_MIN_EXP__=(-1021)
-D__cpp_attributes=200809
-D__UINT_LEAST16_MAX__=65535
-D__ATOMIC_ACQUIRE=2
-D__FLT_MIN__=1.17549435082228750797e-38F
-D__GCC_IEC_559_COMPLEX=2
-D__UINT_LEAST8_TYPE__=unsigned char
-D__INTMAX_C(c)=c ## LL
-D__CHAR_BIT__=8
-D__UINT8_MAX__=255
-D__WINT_MAX__=4294967295U
-D__cpp_static_assert=200410
-D__ORDER_LITTLE_ENDIAN__=1234
-D__SIZE_MAX__=4294967295U
-D__WCHAR_MAX__=2147483647L
-D__GCC_HAVE_SYNC_COMPARE_AND_SWAP_1=1
-D__GCC_HAVE_SYNC_COMPARE_AND_SWAP_2=1
-D__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4=1
-D__DBL_DENORM_MIN__=double(4.94065645841246544177e-324L)
-D__GCC_HAVE_SYNC_COMPARE_AND_SWAP_8=1
-D__GCC_ATOMIC_CHAR_LOCK_FREE=2
-D__GCC_IEC_559=2
-D__FLT_EVAL_METHOD__=2
-D__unix__=1
-D__cpp_binary_literals=201304
-D__GCC_ATOMIC_CHAR32_T_LOCK_FREE=2
-D__cpp_variadic_templates=200704
-D__UINT_FAST64_MAX__=18446744073709551615ULL
-D__SIG_ATOMIC_TYPE__=int
-D__DBL_MIN_10_EXP__=(-307)
-D__FINITE_MATH_ONLY__=0
-D__UINT_FAST8_MAX__=255
-D__DEC64_MAX_EXP__=385
-D__INT8_C(c)=c
-D__UINT_LEAST64_MAX__=18446744073709551615ULL
-D__SHRT_MAX__=32767
-D__LDBL_MAX__=1.18973149535723176502e+4932L
-D__UINT_LEAST8_MAX__=255
-D__GCC_ATOMIC_BOOL_LOCK_FREE=2
-D__UINTMAX_TYPE__=long long unsigned int
-D__linux=1
-D__DEC32_EPSILON__=1E-6DF
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-D__linux__=1
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-D__WCHAR_MIN__=(-__WCHAR_MAX__ - 1)
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-D__DBL_DIG__=15
-D__GCC_ATOMIC_POINTER_LOCK_FREE=2
-D__SIZEOF_INT__=4
-D__SIZEOF_POINTER__=4
-D__GCC_ATOMIC_CHAR16_T_LOCK_FREE=2
-D__USER_LABEL_PREFIX__=
-D__STDC_HOSTED__=1
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-D__INT32_MAX__=2147483647
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-D__DECIMAL_DIG__=21
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-D__LDBL_HAS_QUIET_NAN__=1
-D__GXX_RTTI=1
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-D__SIZEOF_LONG_DOUBLE__=12
-D__BIGGEST_ALIGNMENT__=16
-D__DBL_MAX__=double(1.79769313486231570815e+308L)
-D__cpp_raw_strings=200710
-D__INT_FAST32_MAX__=2147483647
-D__DBL_HAS_INFINITY__=1
-D__INT64_MAX__=9223372036854775807LL
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-D__cplusplus=201103L
-D__DEC128_MAX__=9.999999999999999999999999999999999E6144DL
-D__INT_LEAST32_MAX__=2147483647
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-D__DBL_MAX_EXP__=1024
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-D__GCC_HAVE_DWARF2_CFI_ASM=1
-D__GXX_ABI_VERSION=1002
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-D__DBL_MIN__=double(2.22507385850720138309e-308L)
-D__FLT_MIN_10_EXP__=(-37)
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-D__REGISTER_PREFIX__=
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-D__UINT64_C(c)=c ## ULL
-D__cpp_unicode_characters=200704
-D_STDC_PREDEF_H=1
-D__GCC_ATOMIC_INT_LOCK_FREE=2
-D__FLOAT_WORD_ORDER__=__ORDER_LITTLE_ENDIAN__
-D__STDC_IEC_559_COMPLEX__=1
-D__INT32_C(c)=c
-D__DEC64_EPSILON__=1E-15DD
-D__ORDER_PDP_ENDIAN__=3412
-D__DEC128_MIN_EXP__=(-6142)
-D__code_model_32__=1
-D__INT_FAST32_TYPE__=int
-D__UINT_LEAST16_TYPE__=short unsigned int
-D__INT16_MAX__=32767
-D__i386__=1
-D__SIZE_TYPE__=unsigned int
-D__UINT64_MAX__=18446744073709551615ULL
-D__INT8_TYPE__=signed char
-D__ELF__=1
-D__FLT_RADIX__=2
-D__INT_LEAST16_TYPE__=short int
-D__LDBL_EPSILON__=1.08420217248550443401e-19L
-D__UINTMAX_C(c)=c ## ULL
-D__k8=1
-D__SIG_ATOMIC_MAX__=2147483647
-D__GCC_ATOMIC_WCHAR_T_LOCK_FREE=2
-D__SIZEOF_PTRDIFF_T__=4
-D__DEC32_SUBNORMAL_MIN__=0.000001E-95DF
-D__INT_FAST16_MAX__=2147483647
-D__UINT_FAST32_MAX__=4294967295U
-D__UINT_LEAST64_TYPE__=long long unsigned int
-D__FLT_HAS_QUIET_NAN__=1
-D__FLT_MAX_10_EXP__=38
-D__LONG_MAX__=2147483647L
-D__DEC128_SUBNORMAL_MIN__=0.000000000000000000000000000000001E-6143DL
-D__FLT_HAS_INFINITY__=1
-D__cpp_unicode_literals=200710
-D__UINT_FAST16_TYPE__=unsigned int
-D__DEC64_MAX__=9.999999999999999E384DD
-D__CHAR16_TYPE__=short unsigned int
-D__PRAGMA_REDEFINE_EXTNAME=1
-D__INT_LEAST16_MAX__=32767
-D__DEC64_MANT_DIG__=16
-D__UINT_LEAST32_MAX__=4294967295U
-D__GCC_ATOMIC_LONG_LOCK_FREE=2
-D__INT_LEAST64_TYPE__=long long int
-D__INT16_TYPE__=short int
-D__INT_LEAST8_TYPE__=signed char
-D__DEC32_MAX_EXP__=97
-D__INT_FAST8_MAX__=127
-D__INTPTR_MAX__=2147483647
-D__EXCEPTIONS=1
-D__LDBL_MANT_DIG__=64
-D__DBL_HAS_QUIET_NAN__=1
-D__SIG_ATOMIC_MIN__=(-__SIG_ATOMIC_MAX__ - 1)
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-D__UINT_FAST32_TYPE__=unsigned int
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-D__INT32_TYPE__=int
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-D__UINT_FAST8_TYPE__=unsigned char
-D_GNU_SOURCE=1
-D__ATOMIC_ACQ_REL=4
-D__ATOMIC_RELEASE=3
-I/usr/local/Linux-RHEL7-x86_64/googletest/include
-isystem/usr/local/Linux-RHEL7-x86_64/gcc-4.9.4/include/c++/4.9.4
-isystem/usr/local/Linux-RHEL7-x86_64/gcc-4.9.4/include/c++/4.9.4/x86_64-unknown-linux-gnu/32
-isystem/usr/local/Linux-RHEL7-x86_64/gcc-4.9.4/include/c++/4.9.4/backward
-isystem/usr/local/Linux-RHEL7-x86_64/gcc-4.9.4/lib/gcc/x86_64-unknown-linux-gnu/4.9.4/include
-isystem/usr/local/Linux-RHEL7-x86_64/gcc-4.9.4/lib/gcc/x86_64-unknown-linux-gnu/4.9.4/include-fixed
-isystem/usr/local/include
-isystem/usr/local/Linux-RHEL7-x86_64/gcc-4.9.4/include
-isystem/usr/include

clang-tidy output:

Error while processing /homedir/build/test.cpp.
warning: redefining builtin macro [clang-diagnostic-builtin-macro-redefined]
error: too many errors emitted, stopping now [clang-diagnostic-error]
/usr/local/Linux-RHEL7-x86_64/gcc-4.9.4/lib/gcc/x86_64-unknown-linux-gnu/4.9.4/include/ia32intrin.h:41:10: error: use of undeclared identifier '__builtin_ia32_bsrsi' [clang-diagnostic-error]
   41 |   return __builtin_ia32_bsrsi (__X);
      |          ^
/usr/local/Linux-RHEL7-x86_64/gcc-4.9.4/lib/gcc/x86_64-unknown-linux-gnu/4.9.4/include/ia32intrin.h:104:1: error: definition of builtin function '__rdtsc' [clang-diagnostic-error]
  104 | __rdtsc (void)
      | ^
/usr/local/Linux-RHEL7-x86_64/gcc-4.9.4/lib/gcc/x86_64-unknown-linux-gnu/4.9.4/include/ia32intrin.h:122:10: error: use of undeclared identifier '__builtin_ia32_rolqi'; did you mean '__builtin_ia32_korqi'? [clang-diagnostic-error]
  122 |   return __builtin_ia32_rolqi (__X, __C);
      |          ^
/usr/local/Linux-RHEL7-x86_64/gcc-4.9.4/lib/gcc/x86_64-unknown-linux-gnu/4.9.4/include/ia32intrin.h:41:10: note: '__builtin_ia32_korqi' declared here
   41 |   return __builtin_ia32_bsrsi (__X);
      |          ^
/usr/local/Linux-RHEL7-x86_64/gcc-4.9.4/lib/gcc/x86_64-unknown-linux-gnu/4.9.4/include/ia32intrin.h:130:10: error: use of undeclared identifier '__builtin_ia32_rolhi'; did you mean '__builtin_ia32_korhi'? [clang-diagnostic-error]
  130 |   return __builtin_ia32_rolhi (__X, __C);
      |          ^
/usr/local/Linux-RHEL7-x86_64/gcc-4.9.4/lib/gcc/x86_64-unknown-linux-gnu/4.9.4/include/ia32intrin.h:41:10: note: '__builtin_ia32_korhi' declared here
   41 |   return __builtin_ia32_bsrsi (__X);
      |          ^
/usr/local/Linux-RHEL7-x86_64/gcc-4.9.4/lib/gcc/x86_64-unknown-linux-gnu/4.9.4/include/ia32intrin.h:146:10: error: use of undeclared identifier '__builtin_ia32_rorqi'; did you mean '__builtin_ia32_korqi'? [clang-diagnostic-error]
  146 |   return __builtin_ia32_rorqi (__X, __C);
      |          ^
/usr/local/Linux-RHEL7-x86_64/gcc-4.9.4/lib/gcc/x86_64-unknown-linux-gnu/4.9.4/include/ia32intrin.h:41:10: note: '__builtin_ia32_korqi' declared here
   41 |   return __builtin_ia32_bsrsi (__X);
      |          ^
/usr/local/Linux-RHEL7-x86_64/gcc-4.9.4/lib/gcc/x86_64-unknown-linux-gnu/4.9.4/include/ia32intrin.h:154:10: error: use of undeclared identifier '__builtin_ia32_rorhi'; did you mean '__builtin_ia32_korhi'? [clang-diagnostic-error]
  154 |   return __builtin_ia32_rorhi (__X, __C);
      |          ^
/usr/local/Linux-RHEL7-x86_64/gcc-4.9.4/lib/gcc/x86_64-unknown-linux-gnu/4.9.4/include/ia32intrin.h:41:10: note: '__builtin_ia32_korhi' declared here
   41 |   return __builtin_ia32_bsrsi (__X);
      |          ^
/usr/local/Linux-RHEL7-x86_64/gcc-4.9.4/lib/gcc/x86_64-unknown-linux-gnu/4.9.4/include/xmmintrin.h:127:19: error: use of undeclared identifier '__builtin_ia32_addss' [clang-diagnostic-error]
  127 |   return (__m128) __builtin_ia32_addss ((__v4sf)__A, (__v4sf)__B);
      |                   ^
/usr/local/Linux-RHEL7-x86_64/gcc-4.9.4/lib/gcc/x86_64-unknown-linux-gnu/4.9.4/include/xmmintrin.h:133:19: error: use of undeclared identifier '__builtin_ia32_subss' [clang-diagnostic-error]
  133 |   return (__m128) __builtin_ia32_subss ((__v4sf)__A, (__v4sf)__B);
      |                   ^
/usr/local/Linux-RHEL7-x86_64/gcc-4.9.4/lib/gcc/x86_64-unknown-linux-gnu/4.9.4/include/xmmintrin.h:139:19: error: use of undeclared identifier '__builtin_ia32_mulss' [clang-diagnostic-error]
  139 |   return (__m128) __builtin_ia32_mulss ((__v4sf)__A, (__v4sf)__B);
      |                   ^
/usr/local/Linux-RHEL7-x86_64/gcc-4.9.4/lib/gcc/x86_64-unknown-linux-gnu/4.9.4/include/xmmintrin.h:145:19: error: use of undeclared identifier '__builtin_ia32_divss'; did you mean '__builtin_ia32_minss'? [clang-diagnostic-error]
  145 |   return (__m128) __builtin_ia32_divss ((__v4sf)__A, (__v4sf)__B);
      |                   ^
/usr/local/Linux-RHEL7-x86_64/gcc-4.9.4/lib/gcc/x86_64-unknown-linux-gnu/4.9.4/include/xmmintrin.h:139:19: note: '__builtin_ia32_minss' declared here
  139 |   return (__m128) __builtin_ia32_mulss ((__v4sf)__A, (__v4sf)__B);
      |                   ^
/usr/local/Linux-RHEL7-x86_64/gcc-4.9.4/lib/gcc/x86_64-unknown-linux-gnu/4.9.4/include/xmmintrin.h:183:19: error: use of undeclared identifier '__builtin_ia32_addps'; did you mean '__builtin_ia32_haddps'? [clang-diagnostic-error]
  183 |   return (__m128) __builtin_ia32_addps ((__v4sf)__A, (__v4sf)__B);
      |                   ^
/usr/local/Linux-RHEL7-x86_64/gcc-4.9.4/lib/gcc/x86_64-unknown-linux-gnu/4.9.4/include/xmmintrin.h:183:19: note: '__builtin_ia32_haddps' declared here
/usr/local/Linux-RHEL7-x86_64/gcc-4.9.4/lib/gcc/x86_64-unknown-linux-gnu/4.9.4/include/xmmintrin.h:189:19: error: use of undeclared identifier '__builtin_ia32_subps'; did you mean '__builtin_ia32_hsubps'? [clang-diagnostic-error]
  189 |   return (__m128) __builtin_ia32_subps ((__v4sf)__A, (__v4sf)__B);
      |                   ^
/usr/local/Linux-RHEL7-x86_64/gcc-4.9.4/lib/gcc/x86_64-unknown-linux-gnu/4.9.4/include/xmmintrin.h:133:19: note: '__builtin_ia32_hsubps' declared here
  133 |   return (__m128) __builtin_ia32_subss ((__v4sf)__A, (__v4sf)__B);
      |                   ^
/usr/local/Linux-RHEL7-x86_64/gcc-4.9.4/lib/gcc/x86_64-unknown-linux-gnu/4.9.4/include/xmmintrin.h:195:19: error: use of undeclared identifier '__builtin_ia32_mulps' [clang-diagnostic-error]
  195 |   return (__m128) __builtin_ia32_mulps ((__v4sf)__A, (__v4sf)__B);
      |                   ^
/usr/local/Linux-RHEL7-x86_64/gcc-4.9.4/lib/gcc/x86_64-unknown-linux-gnu/4.9.4/include/xmmintrin.h:201:19: error: use of undeclared identifier '__builtin_ia32_divps'; did you mean '__builtin_ia32_minps'? [clang-diagnostic-error]
  201 |   return (__m128) __builtin_ia32_divps ((__v4sf)__A, (__v4sf)__B);
      |                   ^
/usr/local/Linux-RHEL7-x86_64/gcc-4.9.4/lib/gcc/x86_64-unknown-linux-gnu/4.9.4/include/xmmintrin.h:145:19: note: '__builtin_ia32_minps' declared here
  145 |   return (__m128) __builtin_ia32_divss ((__v4sf)__A, (__v4sf)__B);
      |                   ^
/usr/local/Linux-RHEL7-x86_64/gcc-4.9.4/lib/gcc/x86_64-unknown-linux-gnu/4.9.4/include/xmmintrin.h:239:10: error: use of undeclared identifier '__builtin_ia32_andps'; did you mean '__builtin_ia32_haddps'? [clang-diagnostic-error]
  239 |   return __builtin_ia32_andps (__A, __B);
      |          ^
/usr/local/Linux-RHEL7-x86_64/gcc-4.9.4/lib/gcc/x86_64-unknown-linux-gnu/4.9.4/include/xmmintrin.h:183:19: note: '__builtin_ia32_haddps' declared here
  183 |   return (__m128) __builtin_ia32_addps ((__v4sf)__A, (__v4sf)__B);
      |                   ^
/usr/local/Linux-RHEL7-x86_64/gcc-4.9.4/lib/gcc/x86_64-unknown-linux-gnu/4.9.4/include/xmmintrin.h:245:10: error: use of undeclared identifier '__builtin_ia32_andnps' [clang-diagnostic-error]
  245 |   return __builtin_ia32_andnps (__A, __B);
      |          ^
/usr/local/Linux-RHEL7-x86_64/gcc-4.9.4/lib/gcc/x86_64-unknown-linux-gnu/4.9.4/include/xmmintrin.h:251:10: error: use of undeclared identifier '__builtin_ia32_orps' [clang-diagnostic-error]
  251 |   return __builtin_ia32_orps (__A, __B);
      |          ^
/usr/local/Linux-RHEL7-x86_64/gcc-4.9.4/lib/gcc/x86_64-unknown-linux-gnu/4.9.4/include/xmmintrin.h:257:10: error: use of undeclared identifier '__builtin_ia32_xorps' [clang-diagnostic-error]
  257 |   return __builtin_ia32_xorps (__A, __B);
      |          ^
/usr/local/Linux-RHEL7-x86_64/gcc-4.9.4/lib/gcc/x86_64-unknown-linux-gnu/4.9.4/include/xmmintrin.h:285:19: error: use of undeclared identifier '__builtin_ia32_movss' [clang-diagnostic-error]
  285 |   return (__m128) __builtin_ia32_movss ((__v4sf) __A,
      |                   ^

[elbrandt]

how did you output the clang-tidy command line?
I set C_Cpp.loggingLevel to "Debug" but I still don't see the command line in the output window?

[sean-mcmanus]

@elbrandt They should appear in the C/C++ pane. What version of the extension are you using?

[elbrandt]

thanks, I see it now. PEBKAC :)