Features: Detect C default dialect on MSVC-like compilers
These compilers default to C 90 but do not define __STDC__. While MSVC itself has no option to change the dialect, compilers that document compatibility with MSVC and define _MSC_VER may (e.g. Intel).
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@ -34,7 +34,11 @@ char const *info_cray = "INFO" ":" "compiler_wrapper[CrayPrgEnv]";
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@CMAKE_C_COMPILER_ID_ERROR_FOR_TEST@
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#if !defined(__STDC__)
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# define C_DIALECT
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# if defined(_MSC_VER) && !defined(__clang__)
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# define C_DIALECT "90"
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# else
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# define C_DIALECT
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# endif
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#elif __STDC_VERSION__ >= 201000L
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# define C_DIALECT "11"
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#elif __STDC_VERSION__ >= 199901L
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