File Sema-Handle-objc_super-special-lookup-when-checking-.patch of Package llvm11

From fdab756331f322a9818c1bdf14d23d9cd6036c81 Mon Sep 17 00:00:00 2001
From: Raul Tambre <raul.tambre@cleveron.com>
Date: Fri, 18 Sep 2020 20:07:05 +0300
Subject: [PATCH] [Sema] Handle objc_super special lookup when checking builtin
 compatibility

objc_super is special and needs LookupPredefedObjCSuperType() called before performing builtin type comparisons.
This fixes an error when compiling macOS headers. A test is added.

Differential Revision: https://reviews.llvm.org/D87917
---
 clang/lib/Sema/SemaDecl.cpp                | 1 +
 clang/test/SemaObjCXX/builtin-objcsuper.mm | 8 ++++++++
 2 files changed, 9 insertions(+)
 create mode 100644 clang/test/SemaObjCXX/builtin-objcsuper.mm

diff --git a/clang/lib/Sema/SemaDecl.cpp b/clang/lib/Sema/SemaDecl.cpp
index 2703d9876f85..82c78e3003f0 100644
--- a/clang/lib/Sema/SemaDecl.cpp
+++ b/clang/lib/Sema/SemaDecl.cpp
@@ -9643,6 +9643,7 @@ Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, DeclContext *DC,
             NewFD->addAttr(BuiltinAttr::CreateImplicit(Context, BuiltinID));
           } else {
             ASTContext::GetBuiltinTypeError Error;
+            LookupPredefedObjCSuperType(*this, S, NewFD->getIdentifier());
             QualType BuiltinType = Context.GetBuiltinType(BuiltinID, Error);
 
             if (!Error && !BuiltinType.isNull() &&
diff --git a/clang/test/SemaObjCXX/builtin-objcsuper.mm b/clang/test/SemaObjCXX/builtin-objcsuper.mm
new file mode 100644
index 000000000000..a6baf3c5165a
--- /dev/null
+++ b/clang/test/SemaObjCXX/builtin-objcsuper.mm
@@ -0,0 +1,8 @@
+// RUN: %clang_cc1 -verify %s
+// expected-no-diagnostics
+
+// objc_super has special lookup rules for compatibility with macOS headers, so
+// the following should compile.
+struct objc_super {};
+extern "C" id objc_msgSendSuper(struct objc_super *super, SEL op, ...);
+extern "C" void objc_msgSendSuper_stret(struct objc_super *super, SEL op, ...);
-- 
2.30.0