#if DEFAULT_C23 # if __STDC_VERSION__ <= 201710L # error Unexpected value for __STDC_VERSION__. # endif #elif DEFAULT_C17 # if __STDC_VERSION__ < 201710L # error Unexpected value for __STDC_VERSION__. # endif #elif 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__) && \ !(defined(__SUNPRO_C) && __STDC_VERSION__ == 199409L) # error Unexpected __STDC_VERSION__ definition # endif #endif int main() { return 0; }