gcc/testsuite/c-c++-common/gomp/requires-4.c

#pragma omp requires unified_shared_memory,unified_address,reverse_offload
void
foo (void)
{
  #pragma omp target
  ;
}

#pragma omp requires unified_shared_memory	/* { dg-error "'unified_shared_memory' clause used lexically after first target construct or offloading API" } */
#pragma omp requires unified_address	/* { dg-error "'unified_address' clause used lexically after first target construct or offloading API" } */
#pragma omp requires reverse_offload	/* { dg-error "'reverse_offload' clause used lexically after first target construct or offloading API" } */