Fix PR10204 in a better way.

llvm-svn: 133943

clang/lib/CodeGen/CGExpr.cpp

@@ -791,9 +791,7 @@ RValue CodeGenFunction::EmitLoadOfLValue(LValue LV) {
     return RValue::get(EmitARCLoadWeak(LV.getAddress()));
 
   if (LV.isSimple()) {
-    // Functions are l-values that don't require loading.
-    if (LV.getType()->isFunctionType())
-      return RValue::get(LV.getAddress());
+    assert(!LV.getType()->isFunctionType());
 
     // Everything needs a load.
     return RValue::get(EmitLoadOfScalar(LV));

clang/lib/Sema/SemaExprCXX.cpp

@@ -4461,7 +4461,16 @@ ExprResult Sema::IgnoredValueConversions(Expr *E) {
   //   [Except in specific positions,] an lvalue that does not have
   //   array type is converted to the value stored in the
   //   designated object (and is no longer an lvalue).
-  if (E->isRValue()) return Owned(E);
+  if (E->isRValue()) {
+    // In C, function designators (i.e. expressions of function type)
+    // are r-values, but we still want to do function-to-pointer decay
+    // on them.  This is both technically correct and convenient for
+    // some clients.
+    if (!getLangOptions().CPlusPlus && E->getType()->isFunctionType())
+      return DefaultFunctionArrayConversion(E);
+
+    return Owned(E);
+  }
 
   // We always want to do this on ObjC property references.
   if (E->getObjectKind() == OK_ObjCProperty) {