Custom assertion macro that is not disabled by NDEBUG

test_assert.c

#include <stdio.h>
#include <stdlib.h>


#define ASSERT(x)                                                           \
    do {                                                                    \
        if (!(x)) {                                                         \
            fprintf (stderr, "%s:%u: %s: Assertion `" #x "' failed.\n",     \
                     __FILE__, __LINE__, __func__);                         \
            abort();                                                        \
        }                                                                   \
    } while(0)                                                              \

int main(int argc, const char *argv[])
{
    char *foo = NULL;
    ASSERT(foo != NULL);
    return 0;
}