4 files changed, 14 insertions, 2 deletions
diff --git a/clang/include/clang/AST/DeclBase.h b/clang/include/clang/AST/DeclBase.h
index 3e2435197d2..f6478d9ea66 100644
--- a/clang/include/clang/AST/DeclBase.h
+++ b/clang/include/clang/AST/DeclBase.h
@@ -297,6 +297,7 @@ public:
   }
 
   bool hasAttrs() const { return HasAttrs; }
+  void initAttrs(Attr *attrs);
   void addAttr(Attr *attr);
   const Attr *getAttrs() const {
     if (!HasAttrs) return 0;  // common case, no attributes.
diff --git a/clang/lib/AST/DeclBase.cpp b/clang/lib/AST/DeclBase.cpp
index 8f6fdbc956f..f1b78e40fc8 100644
--- a/clang/lib/AST/DeclBase.cpp
+++ b/clang/lib/AST/DeclBase.cpp
@@ -314,9 +314,20 @@ unsigned Decl::getIdentifierNamespaceForKind(Kind DeclKind) {
   return 0;
 }
 
+void Decl::initAttrs(Attr *attrs) {
+  assert(!HasAttrs && "Decl already contains attrs.");
+
+  Attr *&AttrBlank = getASTContext().getDeclAttrs(this);
+  assert(AttrBlank == 0 && "HasAttrs was wrong?");
+
+  AttrBlank = attrs;
+  HasAttrs = true;
+}
+
 void Decl::addAttr(Attr *NewAttr) {
   Attr *&ExistingAttr = getASTContext().getDeclAttrs(this);
 
+  assert(NewAttr->getNext() == 0 && "Chain of attributes will be truncated!");
   NewAttr->setNext(ExistingAttr);
   ExistingAttr = NewAttr;
 
diff --git a/clang/lib/Frontend/PCHReaderDecl.cpp b/clang/lib/Frontend/PCHReaderDecl.cpp
index 7ccf14362f9..cece1b659c5 100644
--- a/clang/lib/Frontend/PCHReaderDecl.cpp
+++ b/clang/lib/Frontend/PCHReaderDecl.cpp
@@ -113,7 +113,7 @@ void PCHDeclReader::VisitDecl(Decl *D) {
   D->setLocation(SourceLocation::getFromRawEncoding(Record[Idx++]));
   D->setInvalidDecl(Record[Idx++]);
   if (Record[Idx++])
-    D->addAttr(Reader.ReadAttributes());
+    D->initAttrs(Reader.ReadAttributes());
   D->setImplicit(Record[Idx++]);
   D->setUsed(Record[Idx++]);
   D->setAccess((AccessSpecifier)Record[Idx++]);
diff --git a/clang/test/PCH/attrs.h b/clang/test/PCH/attrs.h
index 0d0156515c8..58f05897043 100644
--- a/clang/test/PCH/attrs.h
+++ b/clang/test/PCH/attrs.h
@@ -4,4 +4,4 @@
 
 
 
-int f(int) __attribute__((overloadable));
+int f(int) __attribute__((visibility("default"), overloadable));