Module Debugging: Defer the emission of anonymous tag decls

until we are visiting their declcontext.

This fixes a regression introduced in r256962:
When building debug info for a typdef'd anonymous tag type, we would be
visiting the inner anonymous type first thus creating a "typedef changes
linkage of anonymous type, but linkage was already computed" error.

rdar://problem/24199640

llvm-svn: 258152

1 files changed, 4 insertions, 0 deletions

diff --git a/clang/lib/CodeGen/ObjectFilePCHContainerOperations.cpp b/clang/lib/CodeGen/ObjectFilePCHContainerOperations.cpp
index f385e53fa01..2c0c3ca8a90 100644
--- a/clang/lib/CodeGen/ObjectFilePCHContainerOperations.cpp
+++ b/clang/lib/CodeGen/ObjectFilePCHContainerOperations.cpp
@@ -190,6 +190,10 @@ public:
     if (D->isFromASTFile())
       return;
 
+    // Anonymous tag decls are deferred until we are building their declcontext.
+    if (D->getName().empty())
+      return;
+
     DebugTypeVisitor DTV(*Builder->getModuleDebugInfo(), *Ctx, false);
     DTV.TraverseDecl(D);
     Builder->UpdateCompletedType(D);