gcc/testsuite/gcc.dg/gomp/critical-2.c

/* { dg-do compile } */

void f1(void)
{
  #pragma omp critical a	/* { dg-error "expected" } */
    ;
  #pragma omp critical (	/* { dg-error "expected identifier" } */
    ;
  #pragma omp critical (a	/* { dg-error "expected .\\)." } */
    ;
  #pragma omp critical (a b)	/* { dg-error "expected .\\)." } */
}				/* { dg-error "expected expression" } */