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#include <stdio.h>
#include <omp.h>
 
char mt[769];
 
int main(void)
{
    omp_set_num_threads(64);
 
#pragma omp parallel
    {
        int n, ofst;
 
        n = omp_get_thread_num();
        ofst = n/32*384 + n/8%4*12 + n%8*48;
        snprintf(mt+ofst, 12, "%d x %d = %2d",
            n/8+2, n%8+2, (n/8+2)*(n%8+2));
        mt[ofst+10] = n==31?'\n':' ';
        mt[ofst+11] = n/8%4==3?'\n':' ';
    }
 
    mt[768] = '\0';
    printf("%s\n", mt);
 
    return 0;
}

prog.c: In function ‘main’:
prog.c:10:0: warning: ignoring #pragma omp parallel [-Wunknown-pragmas]
 #pragma omp parallel
 
/home/80Mq7f/ccRaEELl.o: In function `main':
prog.c:(.text.startup+0x17): undefined reference to `omp_set_num_threads'
prog.c:(.text.startup+0x1c): undefined reference to `omp_get_thread_num'
collect2: error: ld returned 1 exit status

Standard output is empty