When returning from a function that has a reference return type, use

EmitReferenceBindingToExpr() rather than assuming we have an
lvalue. This is just the lowest hanging fruit for PR6024, which still
requires a bit of work.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@99447 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/CGStmt.cpp

@@ -607,7 +607,8 @@ void CodeGenFunction::EmitReturnStmt(const ReturnStmt &S) {
   } else if (FnRetTy->isReferenceType()) {
     // If this function returns a reference, take the address of the expression
     // rather than the value.
-    Builder.CreateStore(EmitLValue(RV).getAddress(), ReturnValue);
+    RValue Result = EmitReferenceBindingToExpr(RV, false);
+    Builder.CreateStore(Result.getScalarVal(), ReturnValue);
   } else if (!hasAggregateLLVMType(RV->getType())) {
     Builder.CreateStore(EmitScalarExpr(RV), ReturnValue);
   } else if (RV->getType()->isAnyComplexType()) {

test/CodeGenCXX/references.cpp

@@ -147,3 +147,10 @@ void f(int &a) {
 struct s0;
 struct s1 { struct s0 &s0; };
 void f0(s1 a) { s1 b = a; }
+
+// PR6024
+// CHECK: @_Z2f2v()
+// CHECK: alloca
+// CHECK: store
+// CHECK: load
+const int &f2() { return 0; }