llvm-project/clang/test/SemaCXX/warn-unused-label-error.cpp

// RUN: %clang_cc1 -fsyntax-only -Wunused-variable -Wunused-label -verify %s

static int unused_local_static;

namespace PR8455 {
  void f() {
    A: // expected-warning {{unused label 'A'}}
      __attribute__((unused)) int i; // attribute applies to variable
    B: // attribute applies to label
      __attribute__((unused)); int j; // expected-warning {{unused variable 'j'}}
  }

  void g() {
    C: // unused label 'C' will not appear here because an error has occurred
      __attribute__((unused)) // expected-error {{an attribute list cannot appear here}}
      #pragma weak unused_local_static
      ;
  }

  void h() {
  D:
#pragma weak unused_local_static
    __attribute__((unused)) // expected-error {{'unused' attribute cannot be applied to a statement}}
    ;
  }
}