1 // RUN: %clang_cc1 -fsyntax-only -Wunused -Wused-but-marked-unused -std=c++1z -Wc++1z-extensions -verify %s 2 // RUN: %clang_cc1 -fsyntax-only -Wunused -Wused-but-marked-unused -std=c++11 -Wc++1z-extensions -verify -DEXT %s 3 4 static_assert(__has_cpp_attribute(maybe_unused) == 201603, ""); 5 6 struct [[maybe_unused]] S {}; 7 8 void f() { 9 int x; // expected-warning {{unused variable}} 10 typedef int I; // expected-warning {{unused typedef 'I'}} 11 12 // Should not warn about these due to not being used. 13 [[maybe_unused]] int y; 14 typedef int maybe_unused_int [[maybe_unused]]; 15 16 // Should not warn about these uses. 17 S s; 18 maybe_unused_int test; 19 y = 12; 20 } 21 22 #ifdef EXT 23 // expected-warning@6 {{use of the 'maybe_unused' attribute is a C++1z extension}} 24 // expected-warning@13 {{use of the 'maybe_unused' attribute is a C++1z extension}} 25 // expected-warning@14 {{use of the 'maybe_unused' attribute is a C++1z extension}} 26 #endif 27
