main.c


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#include <stdio.h>
#include <sys/cdefs.h>

int main(int argc, char *argv[]) {
#ifdef _XOPEN_SOURCE
    printf("_XOPEN_SOURCE = %luL\n", _XOPEN_SOURCE);
#endif

#ifdef _POSIX_C_SOURCE
    printf("_POSIX_C_SOURCE = %luL\n", _POSIX_C_SOURCE);
#endif

#ifdef __DARWIN_C_LEVEL
    printf("__DARWIN_C_LEVEL = %luL\n", __DARWIN_C_LEVEL);
#endif

#ifdef snprintf
    char m[10] = {0};
    snprintf(m, sizeof(m), "hello");
    printf("HAVE_SNPRINTF: %s\n", m);
#endif

    return 0;
}