gcc/testsuite/g++.dg/gomp/master-3.C

/* { dg-do compile } */
/* { dg-options "-fopenmp -fdump-tree-omplower" } */

extern void bar(int);

void foo (void)
{
  #pragma omp master
    bar(0);
}

/* { dg-final { scan-tree-dump-times "omp_get_thread_num" 1 "omplower" } } */