3 files changed, 10 insertions, 0 deletions
diff --git a/lib/CodeGen/CGRTTI.cpp b/lib/CodeGen/CGRTTI.cpp
index 1b3cb08284..d9790d0b9e 100644
--- a/lib/CodeGen/CGRTTI.cpp
+++ b/lib/CodeGen/CGRTTI.cpp
@@ -336,6 +336,8 @@ getTypeInfoLinkage(CodeGenModule &CGM, QualType Ty) {
 
     if (const RecordType *Record = dyn_cast<RecordType>(Ty)) {
       const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl());
+      if (RD->hasAttr<WeakAttr>())
+        return llvm::GlobalValue::WeakODRLinkage;
       if (RD->isDynamicClass())
         return CGM.getVTableLinkage(RD);
     }
diff --git a/lib/Sema/SemaDeclAttr.cpp b/lib/Sema/SemaDeclAttr.cpp
index b83b716fdf..d801664ad6 100644
--- a/lib/Sema/SemaDeclAttr.cpp
+++ b/lib/Sema/SemaDeclAttr.cpp
@@ -1914,6 +1914,10 @@ static void handleWeakAttr(Sema &S, Decl *D, const AttributeList &Attr) {
   }
 
   if (!isa<VarDecl>(D) && !isa<FunctionDecl>(D)) {
+    if (isa<CXXRecordDecl>(D)) {
+      D->addAttr(::new (S.Context) WeakAttr(Attr.getRange(), S.Context));
+      return;
+    }
     S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
       << Attr.getName() << ExpectedVariableOrFunction;
     return;
diff --git a/lib/Sema/SemaDeclCXX.cpp b/lib/Sema/SemaDeclCXX.cpp
index f445e9ff5b..2896e9f585 100644
--- a/lib/Sema/SemaDeclCXX.cpp
+++ b/lib/Sema/SemaDeclCXX.cpp
@@ -1151,6 +1151,10 @@ bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases,
       // Okay, add this new base class.
       KnownBaseTypes[NewBaseType] = Bases[idx];
       Bases[NumGoodBases++] = Bases[idx];
+      if (const RecordType *Record = dyn_cast<RecordType>(NewBaseType))
+        if (const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl()))
+          if (RD->hasAttr<WeakAttr>())
+            Class->addAttr(::new (Context) WeakAttr(SourceRange(), Context));
     }
   }