When upgrading an Objective-C class from a forward declaration to a

full-fledged @interface, be sure that the declaration has the right
lexical context. <rdar://problem/7827709>


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@100903 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Sema/SemaDeclObjC.cpp

@@ -98,6 +98,7 @@ ActOnStartClassInterface(SourceLocation AtInterfaceLoc,
       // Since this ObjCInterfaceDecl was created by a forward declaration,
       // we now add it to the DeclContext since it wasn't added before
       // (see ActOnForwardClassDeclaration).
+      IDecl->setLexicalDeclContext(CurContext);
       CurContext->addDecl(IDecl);
       
       if (AttrList)

test/SemaObjCXX/linkage-spec.mm

@@ -2,3 +2,11 @@
 extern "C" {
 @class Protocol;
 }
+
+// <rdar://problem/7827709>
+extern "C" {
+@class I;
+}
+
+@interface I
+@end