1 files changed, 4 insertions, 1 deletions
diff --git a/clang/lib/Sema/SemaDecl.cpp b/clang/lib/Sema/SemaDecl.cpp
index a7d59ec2..6dae243 100644
--- a/clang/lib/Sema/SemaDecl.cpp
+++ b/clang/lib/Sema/SemaDecl.cpp
@@ -16093,8 +16093,11 @@ void Sema::computeNRVO(Stmt *Body, FunctionScopeInfo *Scope) {
 
   for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) {
     if (const VarDecl *NRVOCandidate = Returns[I]->getNRVOCandidate()) {
-      if (!NRVOCandidate->isNRVOVariable())
+      if (!NRVOCandidate->isNRVOVariable()) {
+        Diag(Returns[I]->getRetValue()->getExprLoc(),
+             diag::warn_not_eliding_copy_on_return);
         Returns[I]->setNRVOCandidate(nullptr);
+      }
     }
   }
 }