test/Sema/attr-unused.c

   1 // RUN: %clang_cc1 -verify -Wunused -Wused-but-marked-unused -Wunused-parameter -Wunused -fsyntax-only %s
   2
   3 static void (*fp0)(void) __attribute__((unused));
   4
   5 static void __attribute__((unused)) f0(void);
   6
   7 // On K&R
   8 int f1() __attribute__((unused));
   9
  10 int g0 __attribute__((unused));
  11
  12 int f2() __attribute__((unused(1, 2))); // expected-error {{attribute requires 0 argument(s)}}
  13
  14 struct Test0_unused {} __attribute__((unused));
  15 struct Test0_not_unused {};
  16 typedef int Int_unused __attribute__((unused));
  17 typedef int Int_not_unused;
  18
  19 void test0() {
  20   int x; // expected-warning {{unused variable}}
  21
  22   Int_not_unused i0; // expected-warning {{unused variable}}
  23   Int_unused i1; // expected-warning {{'Int_unused' was marked unused but was used}}
  24
  25   struct Test0_not_unused s0; // expected-warning {{unused variable}}
  26   struct Test0_unused s1; // expected-warning {{'Test0_unused' was marked unused but was used}}
  27 }
  28
  29 int f3(int x) { // expected-warning{{unused parameter 'x'}}
  30   return 0;
  31 }
  32
  33 int f4(int x) {
  34   return x;
  35 }
  36
  37 int f5(int x __attribute__((__unused__))) {
  38   return 0;
  39 }
  40
  41 int f6(int x __attribute__((__unused__))) {
  42   return x; // expected-warning{{'x' was marked unused but was used}}
  43 }