gcc/testsuite/gcc.dg/gomp/requires-1.c

int i;

void
foo ()
{
  #pragma omp requires unified_address				/* { dg-error "may only be used at file scope" } */
  #pragma omp requires unified_shared_memory			/* { dg-error "may only be used at file scope" } */
  #pragma omp requires unified_shared_memory unified_address	/* { dg-error "may only be used at file scope" } */
  #pragma omp requires dynamic_allocators,reverse_offload	/* { dg-error "may only be used at file scope" } */
  #pragma omp requires atomic_default_mem_order(seq_cst)	/* { dg-error "may only be used at file scope" } */
  if (0)
    #pragma omp requires unified_address			/* { dg-error "may only be used at file scope" } */
    i++;
  if (0)
    #pragma omp requires atomic_default_mem_order(seq_cst)	/* { dg-error "may only be used at file scope" } */
    i++;
}

struct S {
  int s;
  #pragma omp requires unified_address				/* { dg-error "may only be used at file scope" } */
};