I just do what the comments tell me to do.

llvm-svn: 116289

clang/lib/Sema/SemaExpr.cpp

@@ -6156,7 +6156,8 @@ QualType Sema::CheckAssignmentOperands(Expr *LHS, Expr *&RHS,
   // is converted to the type of the assignment expression (above).
   // C++ 5.17p1: the type of the assignment expression is that of its left
   // operand.
-  return LHSType.getUnqualifiedType();
+  return (getLangOptions().CPlusPlus
+          ? LHSType : LHSType.getUnqualifiedType());
 }
 
 // C99 6.5.17

clang/test/SemaCXX/expressions.cpp

@@ -14,3 +14,10 @@ void f0() {
   register int x;
   f0_1(&x);
 }
+
+template <class T> void bar(T &x) { T::fail(); }
+template <class T> void bar(volatile T &x) {}
+void f1() {
+  volatile int x;
+  bar(x = 5);
+}