Compiling C with OpenMP on my mac

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?

You installed the library but not the development package [or whatever] that has omp.h. The web site should have better/exact details on how to do this. — Craig Estey
– Craig Estey, Commented Sep 11, 2016 at 22:45
Also on macOS you can name your executables .exe, but you really shouldn't, or they might get associated with some application to be opened with. — Siguza
– Siguza, Commented Sep 11, 2016 at 22:53
I'll look around their site more and see what I can find, so far nothing. I'm doing .exe since it will eventually be put onto a cray machine and they examples given use .exe — user906357
– user906357, Commented Sep 11, 2016 at 23:06

tim18 · Accepted Answer · 2016-09-12 01:03:46Z

1

You should guard the Openmp include and function calls with #if _OPENMP in order to support compiling without the openmp option (gcc -fopenmp).

answered Sep 12, 2016 at 1:03

tim18

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