cmake/Tests/CMakeCommands/target_compile_options/consumer.c

// Visual Studio allows only one set of flags for C and C++.
// In a target using C++ we pick the C++ flags even for C sources.
#ifdef TEST_LANG_DEFINES_FOR_VISUAL_STUDIO
#ifndef CONSUMER_LANG_CXX
#error Expected CONSUMER_LANG_CXX
#endif

#ifdef CONSUMER_LANG_C
#error Unexpected CONSUMER_LANG_C
#endif

#if !LANG_IS_CXX
#error Expected LANG_IS_CXX
#endif

#if LANG_IS_C
#error Unexpected LANG_IS_C
#endif
#else
#ifdef CONSUMER_LANG_CXX
#error Unexpected CONSUMER_LANG_CXX
#endif

#ifndef CONSUMER_LANG_C
#error Expected CONSUMER_LANG_C
#endif

#if !LANG_IS_C
#error Expected LANG_IS_C
#endif

#if LANG_IS_CXX
#error Unexpected LANG_IS_CXX
#endif
#endif

void consumer_c()
{
}