1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35const char features[] = {"\n" "C_FEATURE:" #if (__GNUC__ * 100 + __GNUC_MINOR__) >= 304 "1" #else "0" #endif "c_function_prototypes\n" "C_FEATURE:" #if (__GNUC__ * 100 + __GNUC_MINOR__) >= 304 && defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L "1" #else "0" #endif "c_restrict\n" "C_FEATURE:" #if (__GNUC__ * 100 + __GNUC_MINOR__) >= 406 && defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201000L "1" #else "0" #endif "c_static_assert\n" "C_FEATURE:" #if (__GNUC__ * 100 + __GNUC_MINOR__) >= 304 && defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L "1" #else "0" #endif "c_variadic_macros\n" }; int main(int argc, char** argv) { (void)argv; return features[argc]; }