Implement support for [[maybe_unused]] in C++1z that is based off existing support for unused, and treat it as an extension pre-C++1z. This also means extending the existing unused attribute so that it can be placed on an enum and enumerator, in addition to the other subjects.

llvm-svn: 263025

1 files changed, 2 insertions, 0 deletions

diff --git a/clang/lib/Parse/ParseDeclCXX.cpp b/clang/lib/Parse/ParseDeclCXX.cpp
index 354e405875b..8a28f65dfef 100644
--- a/clang/lib/Parse/ParseDeclCXX.cpp
+++ b/clang/lib/Parse/ParseDeclCXX.cpp
@@ -3637,6 +3637,8 @@ static bool IsBuiltInOrStandardCXX11Attribute(IdentifierInfo *AttrName,
     return true;
   case AttributeList::AT_WarnUnusedResult:
     return !ScopeName && AttrName->getName().equals("nodiscard");
+  case AttributeList::AT_Unused:

+    return !ScopeName && AttrName->getName().equals("maybe_unused");

   default:
     return false;
   }