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enable_language(C)
function(check_language_feature_flags lang level)
if(CMAKE_${lang}${level}_STANDARD_COMPILE_OPTION)
#this property is an internal implementation detail of CMake
get_property(known_features GLOBAL PROPERTY CMAKE_${lang}${level}_KNOWN_FEATURES)
list(LENGTH known_features len)
if(len LESS 1)
message(FATAL_ERROR "unable to find known features of ${lang}${level}")
endif()
string(TOLOWER ${lang} lang_lower)
set(known_name ${lang_lower}${level}_known_features)
set(meta_name ${lang_lower}${level}_meta_feature)
add_library(${known_name} STATIC a.c)
target_compile_features(${known_name} PUBLIC ${known_features})
add_library(${meta_name} STATIC a.c)
target_compile_features(${meta_name} PUBLIC ${lang_lower}_std_${level})
endif()
endfunction()
check_language_feature_flags(C 90)
check_language_feature_flags(C 99)
check_language_feature_flags(C 11)
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