[clang] a1aa330 - [Sema] Handle objc_super special lookup when checking builtin compatibility

[Raul Tambre via cfe-commits]

Author: Raul Tambre
Date: 2020-09-18T20:51:55+03:00
New Revision: a1aa330b202f97ecd243ea9ef0c7ac00a80ea653

URL: https://github.com/llvm/llvm-project/commit/a1aa330b202f97ecd243ea9ef0c7ac00a80ea653
DIFF: https://github.com/llvm/llvm-project/commit/a1aa330b202f97ecd243ea9ef0c7ac00a80ea653.diff

LOG: [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

Added: 
    clang/test/SemaObjCXX/builtin-objcsuper.mm

Modified: 
    clang/lib/Sema/SemaDecl.cpp

Removed: 
    


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diff  --git a/clang/lib/Sema/SemaDecl.cpp b/clang/lib/Sema/SemaDecl.cpp
index 20fb5a4d27e7..81d377cebb32 100644
--- a/clang/lib/Sema/SemaDecl.cpp
+++ b/clang/lib/Sema/SemaDecl.cpp
@@ -9671,6 +9671,7 @@ 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, ...);