Let using directives refer to namespace aliases. Fixes PR5479.

llvm-svn: 89657

1 files changed, 12 insertions, 1 deletions

diff --git a/clang/lib/AST/DeclCXX.cpp b/clang/lib/AST/DeclCXX.cpp
index 94621aa1f69..40019880074 100644
--- a/clang/lib/AST/DeclCXX.cpp
+++ b/clang/lib/AST/DeclCXX.cpp
@@ -886,12 +886,21 @@ UsingDirectiveDecl *UsingDirectiveDecl::Create(ASTContext &C, DeclContext *DC,
                                                SourceRange QualifierRange,
                                                NestedNameSpecifier *Qualifier,
                                                SourceLocation IdentLoc,
-                                               NamespaceDecl *Used,
+                                               NamedDecl *Used,
                                                DeclContext *CommonAncestor) {
+  if (NamespaceDecl *NS = dyn_cast_or_null<NamespaceDecl>(Used))
+    Used = NS->getOriginalNamespace();
   return new (C) UsingDirectiveDecl(DC, L, NamespaceLoc, QualifierRange,
                                     Qualifier, IdentLoc, Used, CommonAncestor);
 }
 
+NamespaceDecl *UsingDirectiveDecl::getNominatedNamespace() {
+  if (NamespaceAliasDecl *NA =
+        dyn_cast_or_null<NamespaceAliasDecl>(NominatedNamespace))
+    return NA->getNamespace();
+  return cast_or_null<NamespaceDecl>(NominatedNamespace);
+}
+
 NamespaceAliasDecl *NamespaceAliasDecl::Create(ASTContext &C, DeclContext *DC,
                                                SourceLocation L,
                                                SourceLocation AliasLoc,
@@ -900,6 +909,8 @@ NamespaceAliasDecl *NamespaceAliasDecl::Create(ASTContext &C, DeclContext *DC,
                                                NestedNameSpecifier *Qualifier,
                                                SourceLocation IdentLoc,
                                                NamedDecl *Namespace) {
+  if (NamespaceDecl *NS = dyn_cast_or_null<NamespaceDecl>(Namespace))
+    Namespace = NS->getOriginalNamespace();
   return new (C) NamespaceAliasDecl(DC, L, AliasLoc, Alias, QualifierRange,
                                     Qualifier, IdentLoc, Namespace);
 }