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XL: Fix C default level detection when invoked as 'cc'

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The IBM XL C compiler does not define `__STDC__` when invoked as plain
`cc` instead of `xlc`, so `CMAKE_C_STANDARD_COMPUTED_DEFAULT` does not
get set and CMake fails.  Teach CMake about the XL compiler's default C
standard in this case.

Fixes: #17649
This commit is contained in:
Brad King
2018-03-14 14:04:12 -04:00
parent c5541cf0da
commit 194b74daec
1 changed files with 2 additions and 1 deletions
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3
Modules/CMakeCCompilerId.c.in
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@@ -34,7 +34,8 @@ char const *info_cray = "INFO" ":" "compiler_wrapper[CrayPrgEnv]";
@CMAKE_C_COMPILER_ID_ERROR_FOR_TEST@
#if !defined(__STDC__)
# if defined(_MSC_VER) && !defined(__clang__)
# if (defined(_MSC_VER) && !defined(__clang__)) \
|| (defined(__ibmxl__) || defined(__IBMC__))
# define C_DIALECT "90"
# else
# define C_DIALECT