在我的Mac上使用OpenMP编译C

Question

I am trying to compile the code:

#include <stdio.h>
#include <omp.h>
int main(){
#pragma omp parallel
    {
        printf("%d\t%d\n",omp_get_thread_num(), omp_get_num_threads());
    }
    return 0;
}

I tried both cc -o main.exe main.c and gcc -o main.exe main.c

Both ways I get "fatal error: 'omp.h' file not found"

So I downloaded the latest version of OpenMP . Then in the terminal in the directory of the downloaded folder I typed make and then

sudo cp ./libiomp5.dylib /usr/lib/

but I am still having the same issue. How can I get this to compile?

Answer 1

您应该使用#if _OPENMP保护Openmp的include和函数调用，以支持不带openmp选项（gcc -fopenmp）的编译。