! Ensure that only argument -Werror is supported.
! RUN: not %flang_fc1 -fsyntax-only -Wall %s 2>&1 | FileCheck %s --check-prefix=WRONG
! RUN: not %flang_fc1 -fsyntax-only -WX %s 2>&1 | FileCheck %s --check-prefix=WRONG
! WRONG: Only `-Werror` is supported currently.