Sema: Permit array l-values in asm output operands

GCC permits array l-values in asm output operands even though they
aren't modifiable l-values.  We used to permit it but this behavior
regressed in r224916.

llvm-svn: 224918

clang/lib/Sema/SemaStmtAsm.cpp

@@ -156,6 +156,9 @@ StmtResult Sema::ActOnGCCAsmStmt(SourceLocation AsmLoc, bool IsSimple,
     case Expr::MLV_Valid:
       // Cool, this is an lvalue.
       break;
+    case Expr::MLV_ArrayType:
+      // This is OK too.
+      break;
     case Expr::MLV_LValueCast: {
       const Expr *LVal = OutputExpr->IgnoreParenNoopCasts(Context);
       if (!getLangOpts().HeinousExtensions) {

clang/test/SemaCXX/statements.cpp

@@ -30,3 +30,7 @@ void test4(int) {            // expected-note{{possible target for call}}
   // expected-error@+1{{overloaded function could not be resolved}}
   __asm__ ("":"+r" (test4)); // expected-error{{invalid lvalue in asm output}}
 }
+void test5() {
+  char buf[1];
+  __asm__ ("":"+r" (buf));
+}