2 files changed, 28 insertions, 0 deletions
diff --git a/llvm/lib/Linker/LinkModules.cpp b/llvm/lib/Linker/LinkModules.cpp
index 3aec864c2d0..ca0bf73002b 100644
--- a/llvm/lib/Linker/LinkModules.cpp
+++ b/llvm/lib/Linker/LinkModules.cpp
@@ -538,6 +538,22 @@ static bool GetLinkageResult(GlobalValue *Dest, const GlobalValue *Src,
   return false;
 }
 
+// Insert all of the named mdnoes in Src into the Dest module.
+static void LinkNamedMDNodes(Module *Dest, Module *Src) {
+  for (Module::const_named_metadata_iterator I = Src->named_metadata_begin(),
+         E = Src->named_metadata_end(); I != E; ++I) {
+    const NamedMDNode *SrcNMD = I;
+    NamedMDNode *DestNMD = Dest->getNamedMetadata(SrcNMD->getName());
+    if (!DestNMD)
+      NamedMDNode::Create(SrcNMD, Dest);
+    else {
+      // Add Src elements into Dest node.
+      for (unsigned i = 0, e = SrcNMD->getNumElements(); i != e; ++i) 
+        DestNMD->addElement(SrcNMD->getElement(i));
+    }
+  }
+}
+
 // LinkGlobals - Loop through the global variables in the src module and merge
 // them into the dest module.
 static bool LinkGlobals(Module *Dest, const Module *Src,
@@ -1307,6 +1323,9 @@ Linker::LinkModules(Module *Dest, Module *Src, std::string *ErrorMsg) {
       AppendingVars.insert(std::make_pair(I->getName(), I));
   }
 
+  // Insert all of the named mdnoes in Src into the Dest module.
+  LinkNamedMDNodes(Dest, Src);
+
   // Insert all of the globals in src into the Dest module... without linking
   // initializers (which could refer to functions not yet mapped over).
   if (LinkGlobals(Dest, Src, ValueMap, AppendingVars, ErrorMsg))
diff --git a/llvm/lib/VMCore/Metadata.cpp b/llvm/lib/VMCore/Metadata.cpp
index 3a61d0eefb7..4762a105550 100644
--- a/llvm/lib/VMCore/Metadata.cpp
+++ b/llvm/lib/VMCore/Metadata.cpp
@@ -104,6 +104,7 @@ MDNode::~MDNode() {
   dropAllReferences();
   getType()->getContext().pImpl->MDNodes.remove(this);
 }
+
 //===----------------------------------------------------------------------===//
 //NamedMDNode implementation
 //
@@ -123,6 +124,14 @@ NamedMDNode::NamedMDNode(const Twine &N, MetadataBase*const* MDs,
     ParentModule->getNamedMDList().push_back(this);
 }
 
+NamedMDNode *NamedMDNode::Create(const NamedMDNode *NMD, Module *M) {
+  assert (NMD && "Invalid source NamedMDNode!");
+  SmallVector<MetadataBase *, 4> Elems;
+  for (unsigned i = 0, e = NMD->getNumElements(); i != e; ++i)
+    Elems.push_back(NMD->getElement(i));
+  return new NamedMDNode(NMD->getName().data(), Elems.data(), Elems.size(), M);
+}
+
 /// eraseFromParent - Drop all references and remove the node from parent
 /// module.
 void NamedMDNode::eraseFromParent() {