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CMakeCCompilerId: Fix C standard detection in Clang and IntelLLVM MSVC mode

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Clang does not define `__STDC__` if in MSVC compatibility mode, but does
define `__STDC_VERSION__`.  Avoid the fallback for this combination.

This backports commit 7596d8b951 (CMakeCCompilerId: Fix C standard
detection in Clang MSVC mode, 2021-02-07, v3.21.0-rc1~587^2~14) to the
3.20 release series.  This is needed since commit 5115dd1e2c (IntelLLVM:
Fix C/C++ standard level flags on Windows, 2021-07-07, v3.21.0-rc3~7^2^2)
now that we activate C/C++ standard level logic for IntelLLVM when
targeting the MSVC ABI.
This commit is contained in:
Raul Tambre
2021-02-07 11:27:21 +02:00
committed by Brad King
parent 5115dd1e2c
commit 1c14691a86
1 changed files with 2 additions and 3 deletions
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5
Modules/CMakeCCompilerId.c.in
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@@ -33,9 +33,8 @@ char const *info_cray = "INFO" ":" "compiler_wrapper[CrayPrgEnv]";
@CMAKE_C_COMPILER_ID_PLATFORM_CONTENT@
@CMAKE_C_COMPILER_ID_ERROR_FOR_TEST@
#if !defined(__STDC__)
# if (defined(_MSC_VER) && !defined(__clang__)) \
|| (defined(__ibmxl__) || defined(__IBMC__))
#if !defined(__STDC__) && !defined(__clang__)
# if defined(_MSC_VER) || defined(__ibmxl__) || defined(__IBMC__)
# define C_DIALECT "90"
# else
# define C_DIALECT