When instantiating a typedef of an anonymous tag type, note in the tag

declaration that this typedef gives the tag a name. Fixes a problem
uncovered by Boost.GIL (Generic Image Library).

llvm-svn: 102180

1 files changed, 10 insertions, 0 deletions

diff --git a/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp b/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
index 10fe176148f..fe60be062c1 100644
--- a/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
+++ b/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
@@ -200,12 +200,22 @@ Decl *TemplateDeclInstantiator::VisitTypedefDecl(TypedefDecl *D) {
   if (Invalid)
     Typedef->setInvalidDecl();
 
+  if (const TagType *TT = DI->getType()->getAs<TagType>()) {
+    TagDecl *TD = TT->getDecl();
+    
+    // If the TagDecl that the TypedefDecl points to is an anonymous decl
+    // keep track of the TypedefDecl.
+    if (!TD->getIdentifier() && !TD->getTypedefForAnonDecl())
+      TD->setTypedefForAnonDecl(Typedef);
+  }
+  
   if (TypedefDecl *Prev = D->getPreviousDeclaration()) {
     NamedDecl *InstPrev = SemaRef.FindInstantiatedDecl(D->getLocation(), Prev,
                                                        TemplateArgs);
     Typedef->setPreviousDeclaration(cast<TypedefDecl>(InstPrev));
   }
 
+
   Typedef->setAccess(D->getAccess());
   Owner->addDecl(Typedef);