[C/C++] error: identifier "_Float32" is undefined (_Float32, _Float64, _Float128)

[intrigus-lgtm]

We tried to build a CodeQL DB for https://github.com/category-labs/monad/.
After working around #20636 there are still quite a few errors in the build-tracer.log file related to libstdc++'s bits/cpp_type_traits.h.

They appear to be related to new floating point types introduced in C23.
I guess the extractor tries to even "understand" code that is guarded by macros and then chokes because it doesn't know the types?

Minimized reproducer

#ifdef __STDCPP_FLOAT32_T__
  _Float32 float32;
#endif

#ifdef __STDCPP_FLOAT64_T__
  _Float64 float64;
#endif

#ifdef __STDCPP_FLOAT128_T__
  _Float128 float128;
#endif

Run like this:

mytmpdir=$(mktemp -d 2>/dev/null || mktemp -d -t 'mytmpdir')
codeql database create "$mytmpdir" --language=cpp --command="/usr/lib/llvm-19/bin/clang -std=gnu++23 -c cpp_type_traits.cpp" --overwrite

Error log extract

[E 13:06:42 2257537] Processed command line: /home/sg/.local/share/gh/extensions/gh-codeql/dist/release/v2.23.2/cpp/tools/linux64/extractor --trapfolder /tmp/tmp.vDf5OrcRo7/trap/cpp --src_archive /tmp/tmp.vDf5OrcRo7/src --no_warnings_and_discretionary_errors --error_limit 1000 --disable_system_macros --variadic_macros --incognito '--c++23' '--g++' --clang_version 190107 --gnu_version 40801 --has_feature_vector 1111111100000011011111110111111111111111111011111111111110111111111111 --clang --target linux_x86_64 -D_GNU_SOURCE=1 -D_LP64=1 -D__ATOMIC_ACQUIRE=2 -D__ATOMIC_ACQ_REL=4 -D__ATOMIC_CONSUME=1 -D__ATOMIC_RELAXED=0 -D__ATOMIC_RELEASE=3 -D__ATOMIC_SEQ_CST=5 -D__BIGGEST_ALIGNMENT__=16 -D__BITINT_MAXWIDTH__=8388608 -D__BOOL_WIDTH__=8 -D__BYTE_ORDER__=__ORDER_LITTLE_ENDIAN__ -D__CHAR_BIT__=8 -D__CLANG_ATOMIC_BOOL_LOCK_FREE=2 -D__CLANG_ATOMIC_CHAR16_T_LOCK_FREE=2 -D__CLANG_ATOMIC_CHAR32_T_LOCK_FREE=2 -D__CLANG_ATOMIC_CHAR8_T_LOCK_FREE=2 -D__CLANG_ATOMIC_CHAR_LOCK_FREE=2 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-D__OPENCL_MEMORY_SCOPE_WORK_ITEM=0 -D__ORDER_BIG_ENDIAN__=4321 -D__ORDER_LITTLE_ENDIAN__=1234 -D__ORDER_PDP_ENDIAN__=3412 -D__PIC__=2 -D__PIE__=2 -D__POINTER_WIDTH__=64 -D__PRAGMA_REDEFINE_EXTNAME=1 '-D__PTRDIFF_FMTd__="ld"' '-D__PTRDIFF_FMTi__="li"' -D__PTRDIFF_MAX__=9223372036854775807L '-D__PTRDIFF_TYPE__=long int' -D__PTRDIFF_WIDTH__=64 -D__REGISTER_PREFIX__= -D__SCHAR_MAX__=127 -D__SEG_FS=1 -D__SEG_GS=1 -D__SHRT_MAX__=32767 -D__SHRT_WIDTH__=16 -D__SIG_ATOMIC_MAX__=2147483647 -D__SIG_ATOMIC_WIDTH__=32 -D__SIZEOF_DOUBLE__=8 -D__SIZEOF_FLOAT128__=16 -D__SIZEOF_FLOAT__=4 -D__SIZEOF_INT128__=16 -D__SIZEOF_INT__=4 -D__SIZEOF_LONG_DOUBLE__=16 -D__SIZEOF_LONG_LONG__=8 -D__SIZEOF_LONG__=8 -D__SIZEOF_POINTER__=8 -D__SIZEOF_PTRDIFF_T__=8 -D__SIZEOF_SHORT__=2 -D__SIZEOF_SIZE_T__=8 -D__SIZEOF_WCHAR_T__=4 -D__SIZEOF_WINT_T__=4 '-D__SIZE_FMTX__="lX"' '-D__SIZE_FMTo__="lo"' '-D__SIZE_FMTu__="lu"' '-D__SIZE_FMTx__="lx"' -D__SIZE_MAX__=18446744073709551615UL '-D__SIZE_TYPE__=long unsigned int' -D__SIZE_WIDTH__=64 -D__SSE2_MATH__=1 -D__SSE2__=1 -D__SSE_MATH__=1 -D__SSE__=1 -D__STDCPP_DEFAULT_NEW_ALIGNMENT__=16UL -D__STDCPP_THREADS__=1 -D__STDC_EMBED_EMPTY__=2 -D__STDC_EMBED_FOUND__=1 -D__STDC_EMBED_NOT_FOUND__=0 -D__STDC_UTF_16__=1 -D__STDC_UTF_32__=1 -D__UINT16_C_SUFFIX__= '-D__UINT16_FMTX__="hX"' '-D__UINT16_FMTo__="ho"' '-D__UINT16_FMTu__="hu"' '-D__UINT16_FMTx__="hx"' -D__UINT16_MAX__=65535 '-D__UINT16_TYPE__=unsigned short' -D__UINT32_C_SUFFIX__=U '-D__UINT32_FMTX__="X"' '-D__UINT32_FMTo__="o"' '-D__UINT32_FMTu__="u"' '-D__UINT32_FMTx__="x"' -D__UINT32_MAX__=4294967295U '-D__UINT32_TYPE__=unsigned int' -D__UINT64_C_SUFFIX__=UL '-D__UINT64_FMTX__="lX"' '-D__UINT64_FMTo__="lo"' '-D__UINT64_FMTu__="lu"' '-D__UINT64_FMTx__="lx"' -D__UINT64_MAX__=18446744073709551615UL '-D__UINT64_TYPE__=long unsigned int' -D__UINT8_C_SUFFIX__= '-D__UINT8_FMTX__="hhX"' '-D__UINT8_FMTo__="hho"' '-D__UINT8_FMTu__="hhu"' '-D__UINT8_FMTx__="hhx"' -D__UINT8_MAX__=255 '-D__UINT8_TYPE__=unsigned 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'-D__UINT_FAST64_TYPE__=long unsigned int' '-D__UINT_FAST8_FMTX__="hhX"' '-D__UINT_FAST8_FMTo__="hho"' '-D__UINT_FAST8_FMTu__="hhu"' '-D__UINT_FAST8_FMTx__="hhx"' -D__UINT_FAST8_MAX__=255 '-D__UINT_FAST8_TYPE__=unsigned char' '-D__UINT_LEAST16_FMTX__="hX"' '-D__UINT_LEAST16_FMTo__="ho"' '-D__UINT_LEAST16_FMTu__="hu"' '-D__UINT_LEAST16_FMTx__="hx"' -D__UINT_LEAST16_MAX__=65535 '-D__UINT_LEAST16_TYPE__=unsigned short' '-D__UINT_LEAST32_FMTX__="X"' '-D__UINT_LEAST32_FMTo__="o"' '-D__UINT_LEAST32_FMTu__="u"' '-D__UINT_LEAST32_FMTx__="x"' -D__UINT_LEAST32_MAX__=4294967295U '-D__UINT_LEAST32_TYPE__=unsigned int' '-D__UINT_LEAST64_FMTX__="lX"' '-D__UINT_LEAST64_FMTo__="lo"' '-D__UINT_LEAST64_FMTu__="lu"' '-D__UINT_LEAST64_FMTx__="lx"' -D__UINT_LEAST64_MAX__=18446744073709551615UL '-D__UINT_LEAST64_TYPE__=long unsigned int' '-D__UINT_LEAST8_FMTX__="hhX"' '-D__UINT_LEAST8_FMTo__="hho"' '-D__UINT_LEAST8_FMTu__="hhu"' '-D__UINT_LEAST8_FMTx__="hhx"' -D__UINT_LEAST8_MAX__=255 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-D__linux=1 -D__linux__=1 -D__llvm__=1 -D__pic__=2 -D__pie__=2 -D__private_extern__=extern '-D__seg_fs=__attribute__((address_space(257)))' '-D__seg_gs=__attribute__((address_space(256)))' -D__tune_k8__=1 -D__unix=1 -D__unix__=1 -D__x86_64=1 -D__x86_64__=1 -Dlinux=1 -Dunix=1 '-I/usr/lib/gcc/x86_64-linux-gnu/14/../../../../include/c++/14' '-I/usr/lib/gcc/x86_64-linux-gnu/14/../../../../include/x86_64-linux-gnu/c++/14' '-I/usr/lib/gcc/x86_64-linux-gnu/14/../../../../include/c++/14/backward' -I/usr/lib/llvm-19/lib/clang/19/include -I/usr/local/include -I/usr/include/x86_64-linux-gnu -I/usr/include -- cpp_type_traits.cpp
[E 13:06:42 2257537] CODEQL_EXTRACTOR_CPP_TRAP_CACHING is not set
[E 13:06:42 2257537] CODEQL_EXTRACTOR_CPP_OPTION_TRAP_CACHE_WRITE is not set
[E 13:06:42 2257537] CODEQL_EXTRACTOR_CPP_OPTION_TRAP_CACHE_DIR is not set
[E 13:06:42 2257537] Initialising TRAP cache at path: e4/1c76/765a332316fed948410a061f9a7e
[E 13:06:42 2257537] Not using TRAP cache
[E 13:06:42 2257537] TRAP cache miss
[E 13:06:42 2257537] Starting compilation TRAP /tmp/tmp.vDf5OrcRo7/trap/cpp/compilations/54/36453265_0.trap.zst
[E 13:06:42 2257537] Archiving /tmp/tmp.vDf5OrcRo7/src/home/sg/monad-execution-fuzzing/cpp_type_traits.cpp
"cpp_type_traits.cpp", line 2: error: identifier "_Float32" is undefined
    _Float32 float32;
    ^

[E 13:06:42 2257537] Warning[extractor-c++]: In construct_text_message: "cpp_type_traits.cpp", line 2: error: identifier "_Float32" is undefined
    _Float32 float32;
    ^


"cpp_type_traits.cpp", line 6: error: identifier "_Float64" is undefined
    _Float64 float64;
    ^

[E 13:06:42 2257537] Warning[extractor-c++]: In construct_text_message: "cpp_type_traits.cpp", line 6: error: identifier "_Float64" is undefined
    _Float64 float64;
    ^


"cpp_type_traits.cpp", line 10: error: identifier "_Float128" is undefined
    _Float128 float128;
    ^

[E 13:06:42 2257537] Warning[extractor-c++]: In construct_text_message: "cpp_type_traits.cpp", line 10: error: identifier "_Float128" is undefined
    _Float128 float128;
    ^

build-tracer.log

"Original" reproducer

#include <bits/cpp_type_traits.h>

OS information

• CodeQL v2.23.2
• Debian 13
• libstdc++-14
• clang-19

Please let me know if you need anything else!

[jketema]

The extractor understands those types. However, clang does not support this in C++ modes, so this behavior seems correct.

[jketema]

I see what the problem is. We accidentally define the __STDCPP_FLOAT..._T__ macros when emulating clang. I'll report this to our front-end provider.

[jketema]

Note that C++23 support is currently in beta, so there might be further issues.

[intrigus-lgtm]

I see what the problem is. We accidentally define the __STDCPP_FLOAT..._T__ macros when emulating clang. I'll report this to our front-end provider.

Ah, that makes more sense.
I was looking at the command line and didn't find any place where those defines are enabled, but it definitely worked with plain clang :)