CMake/Tests/CompileFeatures/default_dialect.c

#if DEFAULT_C11
#if __STDC_VERSION__ != 201112L
#error Unexpected value for __STDC_VERSION__.
#endif
#elif DEFAULT_C99
#if __STDC_VERSION__ != 199901L
#error Unexpected value for __STDC_VERSION__.
#endif
#else
#if !DEFAULT_C90
#error Buildsystem error
#endif
#if defined(__STDC_VERSION__)
#error Unexpected __STDC_VERSION__ definition
#endif
#endif

int main()
{
  return 0;
}