clang/test/SemaCXX/warn-unused-attribute.cpp

   1 // RUN: %clang_cc1 -fsyntax-only -Wunused-variable -verify %s
   2 struct __attribute__((warn_unused)) Test {
   3   Test();
   4   ~Test();
   5   void use();
   6 };
   7
   8 struct TestNormal {
   9   TestNormal();
  10 };
  11
  12 int main(void) {
  13   Test unused;         // expected-warning {{unused variable 'unused'}}
  14   Test used;
  15   TestNormal normal;
  16   used.use();
  17
  18   int i __attribute__((warn_unused)) = 12; // expected-warning {{'warn_unused' attribute only applies to structs, unions, and classes}}
  19   return i;
  20 }