From 470fb73d4e09e1dfe62cb545d7fe0e567ac6e8d6 Mon Sep 17 00:00:00 2001
From: Eli Friedman <eli.friedman@gmail.com>
Date: Fri, 11 Dec 2009 20:48:18 +0000
Subject: [PATCH] Fix linkage of type info and vtable for classes without
 linkage.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@91152 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/CGRTTI.cpp             | 4 ++--
 lib/CodeGen/CGVtable.cpp           | 2 +-
 test/CodeGenCXX/vtable-linkage.cpp | 8 ++++++++
 3 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/lib/CodeGen/CGRTTI.cpp b/lib/CodeGen/CGRTTI.cpp
index a574703935..a15ba4f215 100644
--- a/lib/CodeGen/CGRTTI.cpp
+++ b/lib/CodeGen/CGRTTI.cpp
@@ -230,7 +230,7 @@ public:
       return llvm::ConstantExpr::getBitCast(GV, Int8PtrTy);
 
     // If we're in an anonymous namespace, then we always want internal linkage.
-    if (RD->isInAnonymousNamespace())
+    if (RD->isInAnonymousNamespace() || !RD->hasLinkage())
       Linkage = llvm::GlobalVariable::InternalLinkage;
     
     bool Hidden = CGM.getDeclVisibilityMode(RD) == LangOptions::Hidden;
@@ -295,7 +295,7 @@ public:
       return DecideExtern(PT->getPointeeType());
     if (const RecordType *RT = Ty->getAs<RecordType>())
       if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl()))
-        return !RD->isInAnonymousNamespace();
+        return !RD->isInAnonymousNamespace() && RD->hasLinkage();
     return true;
   }
 
diff --git a/lib/CodeGen/CGVtable.cpp b/lib/CodeGen/CGVtable.cpp
index 752f69c7c2..868a341440 100644
--- a/lib/CodeGen/CGVtable.cpp
+++ b/lib/CodeGen/CGVtable.cpp
@@ -1458,7 +1458,7 @@ void CGVtableInfo::MaybeEmitVtable(GlobalDecl GD) {
   }
 
   llvm::GlobalVariable::LinkageTypes Linkage;
-  if (RD->isInAnonymousNamespace())
+  if (RD->isInAnonymousNamespace() || !RD->hasLinkage())
     Linkage = llvm::GlobalVariable::InternalLinkage;
   else if (KeyFunction && !MD->isInlined())
     Linkage = llvm::GlobalVariable::ExternalLinkage;
diff --git a/test/CodeGenCXX/vtable-linkage.cpp b/test/CodeGenCXX/vtable-linkage.cpp
index 5bc509b65e..f2d914feed 100644
--- a/test/CodeGenCXX/vtable-linkage.cpp
+++ b/test/CodeGenCXX/vtable-linkage.cpp
@@ -28,6 +28,8 @@ struct D {
 
 void D::f() { }
 
+static struct : D { } e;
+
 // B has a key function that is not defined in this translation unit so its vtable
 // has external linkage.
 // CHECK: @_ZTV1B = external constant
@@ -43,6 +45,12 @@ void D::f() { }
 // CHECK: @_ZTI1D = constant
 // CHECK: @_ZTV1D = constant
 
+// The anonymous struct for e has no linkage, so the vtable should have
+// internal linkage.
+// CHECK: @"_ZTS3$_0" = internal constant
+// CHECK: @"_ZTI3$_0" = internal constant
+// CHECK: @"_ZTV3$_0" = internal constant
+
 // The A vtable should have internal linkage since it is inside an anonymous 
 // namespace.
 // CHECK: @_ZTSN12_GLOBAL__N_11AE = internal constant