5 files changed, 23 insertions, 2 deletions
diff --git a/lib/DebugInfo/CodeView/RecordName.cpp b/lib/DebugInfo/CodeView/RecordName.cpp
index e50c43a1d481..d868ae237a44 100644
--- a/lib/DebugInfo/CodeView/RecordName.cpp
+++ b/lib/DebugInfo/CodeView/RecordName.cpp
@@ -307,6 +307,9 @@ static int getSymbolNameOffset(CVSymbol Sym) {
   // See BPRelativeSym
   case SymbolKind::S_BPREL32:
     return 8;
+  // See UsingNamespaceSym
+  case SymbolKind::S_UNAMESPACE:
+    return 0;
   default:
     return -1;
   }
diff --git a/lib/DebugInfo/CodeView/SymbolDumper.cpp b/lib/DebugInfo/CodeView/SymbolDumper.cpp
index af249adc9774..f8bf961f22a1 100644
--- a/lib/DebugInfo/CodeView/SymbolDumper.cpp
+++ b/lib/DebugInfo/CodeView/SymbolDumper.cpp
@@ -611,6 +611,12 @@ Error CVSymbolDumperImpl::visitKnownRecord(CVSymbol &CVR, UDTSym &UDT) {
   return Error::success();
 }
 
+Error CVSymbolDumperImpl::visitKnownRecord(CVSymbol &CVR,
+                                           UsingNamespaceSym &UN) {
+  W.printString("Namespace", UN.Name);
+  return Error::success();
+}
+
 Error CVSymbolDumperImpl::visitUnknownSymbol(CVSymbol &CVR) {
   W.printNumber("Length", CVR.length());
   return Error::success();
diff --git a/lib/DebugInfo/CodeView/SymbolRecordMapping.cpp b/lib/DebugInfo/CodeView/SymbolRecordMapping.cpp
index 923837a45d9f..e77c8e8f02f5 100644
--- a/lib/DebugInfo/CodeView/SymbolRecordMapping.cpp
+++ b/lib/DebugInfo/CodeView/SymbolRecordMapping.cpp
@@ -463,3 +463,11 @@ Error SymbolRecordMapping::visitKnownRecord(CVSymbol &CVR, UDTSym &UDT) {
 
   return Error::success();
 }
+
+Error SymbolRecordMapping::visitKnownRecord(CVSymbol &CVR,
+                                            UsingNamespaceSym &UN) {
+
+  error(IO.mapStringZ(UN.Name));
+
+  return Error::success();
+}
diff --git a/lib/DebugInfo/CodeView/TypeIndexDiscovery.cpp b/lib/DebugInfo/CodeView/TypeIndexDiscovery.cpp
index 95082d4a8e03..839ab6f0a705 100644
--- a/lib/DebugInfo/CodeView/TypeIndexDiscovery.cpp
+++ b/lib/DebugInfo/CodeView/TypeIndexDiscovery.cpp
@@ -428,7 +428,7 @@ static bool discoverTypeIndices(ArrayRef<uint8_t> Content, SymbolKind Kind,
   case SymbolKind::S_DEFRANGE_SUBFIELD:
     break;
 
-  // No type refernces.
+  // No type references.
   case SymbolKind::S_LABEL32:
   case SymbolKind::S_OBJNAME:
   case SymbolKind::S_COMPILE:
@@ -439,6 +439,7 @@ static bool discoverTypeIndices(ArrayRef<uint8_t> Content, SymbolKind Kind,
   case SymbolKind::S_FRAMEPROC:
   case SymbolKind::S_THUNK32:
   case SymbolKind::S_FRAMECOOKIE:
+  case SymbolKind::S_UNAMESPACE:
     break;
   // Scope ending symbols.
   case SymbolKind::S_END:
diff --git a/lib/DebugInfo/CodeView/TypeStreamMerger.cpp b/lib/DebugInfo/CodeView/TypeStreamMerger.cpp
index e4f39dd988e1..2e29c9d7dfa0 100644
--- a/lib/DebugInfo/CodeView/TypeStreamMerger.cpp
+++ b/lib/DebugInfo/CodeView/TypeStreamMerger.cpp
@@ -226,7 +226,10 @@ bool TypeStreamMerger::remapIndexFallback(TypeIndex &Idx,
   if (IsSecondPass && MapPos >= Map.size()) {
     // FIXME: Print a more useful error. We can give the current record and the
     // index that we think its pointing to.
-    LastError = joinErrors(std::move(*LastError), errorCorruptRecord());
+    if (LastError)
+      LastError = joinErrors(std::move(*LastError), errorCorruptRecord());
+    else
+      LastError = errorCorruptRecord();
   }
 
   ++NumBadIndices;