[AST] Fix loss of enum forward decl from decl context

For example, given:

  enum __attribute__((deprecated)) T *p;

-ast-print produced:

  enum T *p;

The attribute was lost because the enum forward decl was lost.

Another example is the loss of enum forward decls from C++ namespaces
(in MS compatibility mode).

The trouble was that the EnumDecl node was suppressed, as revealed by
-ast-dump.  The suppression of the EnumDecl was intentional in
r116122, but I don't understand why.  The suppression isn't needed for
the test suite to behave.

Reviewed by: rsmith

Differential Revision: https://reviews.llvm.org/D46846

llvm-svn: 333574

1 files changed, 1 insertions, 10 deletions

diff --git a/clang/lib/Sema/SemaDecl.cpp b/clang/lib/Sema/SemaDecl.cpp
index c422a85d84e..862da621491 100644
--- a/clang/lib/Sema/SemaDecl.cpp
+++ b/clang/lib/Sema/SemaDecl.cpp
@@ -14287,7 +14287,6 @@ CreateNewDecl:
   // PrevDecl.
   TagDecl *New;
 
-  bool IsForwardReference = false;
   if (Kind == TTK_Enum) {
     // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.:
     // enum X { A, B, C } D;    D should chain to X.
@@ -14317,12 +14316,6 @@ CreateNewDecl:
         else if (getLangOpts().CPlusPlus)
           DiagID = diag::err_forward_ref_enum;
         Diag(Loc, DiagID);
-
-        // If this is a forward-declared reference to an enumeration, make a
-        // note of it; we won't actually be introducing the declaration into
-        // the declaration context.
-        if (TUK == TUK_Reference)
-          IsForwardReference = true;
       }
     }
 
@@ -14480,9 +14473,7 @@ CreateNewDecl:
         PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false);
   } else if (Name) {
     S = getNonFieldDeclScope(S);
-    PushOnScopeChains(New, S, !IsForwardReference);
-    if (IsForwardReference)
-      SearchDC->makeDeclVisibleInContext(New);
+    PushOnScopeChains(New, S, true);
   } else {
     CurContext->addDecl(New);
   }