1 files changed, 20 insertions, 0 deletions
diff --git a/lib/Sema/SemaDecl.cpp b/lib/Sema/SemaDecl.cpp
index 61791b2aa5..3bbb9a4cfd 100644
--- a/lib/Sema/SemaDecl.cpp
+++ b/lib/Sema/SemaDecl.cpp
@@ -1464,6 +1464,24 @@ Scope *Sema::getNonFieldDeclScope(Scope *S) {
   return S;
 }
 
+/// \brief Looks up the declaration of "struct objc_super" and
+/// saves it for later use in building builtin declaration of
+/// objc_msgSendSuper and objc_msgSendSuper_stret. If no such
+/// pre-existing declaration exists no action takes place.
+static void LookupPredefedObjCSuperType(Sema &ThisSema, Scope *S,
+                                        IdentifierInfo *II) {
+  if (!II->isStr("objc_msgSendSuper"))
+    return;
+  ASTContext &Context = ThisSema.Context;
+    
+  LookupResult Result(ThisSema, &Context.Idents.get("objc_super"),
+                      SourceLocation(), Sema::LookupTagName);
+  ThisSema.LookupName(Result, S);
+  if (Result.getResultKind() == LookupResult::Found)
+    if (const TagDecl *TD = Result.getAsSingle<TagDecl>())
+      Context.setObjCSuperType(Context.getTagDeclType(TD));
+}
+
 /// LazilyCreateBuiltin - The specified Builtin-ID was first used at
 /// file scope.  lazily create a decl for it. ForRedeclaration is true
 /// if we're creating this built-in in anticipation of redeclaring the
@@ -1471,6 +1489,8 @@ Scope *Sema::getNonFieldDeclScope(Scope *S) {
 NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid,
                                      Scope *S, bool ForRedeclaration,
                                      SourceLocation Loc) {
+  LookupPredefedObjCSuperType(*this, S, II);
+  
   Builtin::ID BID = (Builtin::ID)bid;
 
   ASTContext::GetBuiltinTypeError Error;