clang/test/Sema/c2x-maybe_unused.c

   1 // RUN: %clang_cc1 -fsyntax-only -Wunused -std=c2x -verify %s
   2
   3 struct [[maybe_unused]] S1 { // ok
   4   int a [[maybe_unused]];
   5 };
   6
   7 enum [[maybe_unused]] E1 {
   8   EnumVal [[maybe_unused]]
   9 };
  10
  11 [[maybe_unused]] void unused_func([[maybe_unused]] int parm) {
  12   typedef int maybe_unused_int [[maybe_unused]];
  13   [[maybe_unused]] int I;
  14 }
  15
  16 void f1(void) {
  17   int x; // expected-warning {{unused variable}}
  18   typedef int I; // expected-warning {{unused typedef 'I'}}
  19
  20   // Should not warn about these due to not being used.
  21   [[maybe_unused]] int y;
  22   typedef int maybe_unused_int [[maybe_unused]];
  23
  24   // Should not warn about these uses.
  25   struct S1 s;
  26   maybe_unused_int test;
  27   y = 12;
  28 }
  29
  30 void f2(void);
  31 [[maybe_unused]] void f2(void);
  32
  33 void f2(void) {
  34 }
  35