Add Support for 'warn_unused_result" attribute on

objective-c methods. (radar 7418262).



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@99903 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 7 insertions, 1 deletions

diff --git a/lib/Sema/SemaStmt.cpp b/lib/Sema/SemaStmt.cpp
index 733022aac3..1e37bb00c4 100644
--- a/lib/Sema/SemaStmt.cpp
+++ b/lib/Sema/SemaStmt.cpp
@@ -119,7 +119,13 @@ void Sema::DiagnoseUnusedExprResult(const Stmt *S) {
       }
     }        
   }
-
+  else if (const ObjCMessageExpr *ME = dyn_cast<ObjCMessageExpr>(E)) {
+    const ObjCMethodDecl *MD = ME->getMethodDecl();
+    if (MD && MD->getAttr<WarnUnusedResultAttr>()) {
+      Diag(Loc, diag::warn_unused_call) << R1 << R2 << "warn_unused_result";
+      return;
+    }
+  }
   Diag(Loc, DiagID) << R1 << R2;
 }