| // RUN: %clang_cc1 -fsyntax-only -Wunused -Wused-but-marked-unused -std=c++17 -Wc++17-extensions -verify %s |
| // RUN: %clang_cc1 -fsyntax-only -Wunused -Wused-but-marked-unused -std=c++11 -Wc++17-extensions -verify -DEXT %s |
| |
| static_assert(__has_cpp_attribute(maybe_unused) == 201603, ""); |
| |
| struct [[maybe_unused]] S {}; |
| |
| enum E1 { |
| EnumVal [[maybe_unused]], |
| UsedEnumVal, |
| }; |
| |
| void f() { |
| int x; // expected-warning {{unused variable}} |
| typedef int I; // expected-warning {{unused typedef 'I'}} |
| E1 e; |
| switch (e) { // expected-warning {{enumeration value 'UsedEnumVal' not handled in switch}} |
| } |
| |
| // Should not warn about these due to not being used. |
| [[maybe_unused]] int y; |
| typedef int maybe_unused_int [[maybe_unused]]; |
| |
| // Should not warn about these uses. |
| S s; |
| maybe_unused_int test; |
| y = 12; |
| switch (e) { |
| case UsedEnumVal: |
| break; |
| } |
| } |
| |
| #ifdef EXT |
| // expected-warning@6 {{use of the 'maybe_unused' attribute is a C++17 extension}} |
| // expected-warning@9 {{use of the 'maybe_unused' attribute is a C++17 extension}} |
| // expected-warning@9 {{attributes on an enumerator declaration are a C++17 extension}} |
| // expected-warning@21 {{use of the 'maybe_unused' attribute is a C++17 extension}} |
| // expected-warning@22 {{use of the 'maybe_unused' attribute is a C++17 extension}} |
| #endif |
