1 files changed, 4 insertions, 0 deletions
diff --git a/clang/lib/CodeGen/CGDecl.cpp b/clang/lib/CodeGen/CGDecl.cpp
index f0822675f87..00eb8b477ba 100644
--- a/clang/lib/CodeGen/CGDecl.cpp
+++ b/clang/lib/CodeGen/CGDecl.cpp
@@ -63,6 +63,10 @@ void CodeGenFunction::EmitBlockVarDecl(const VarDecl &D) {
   if (D.getAttr<AsmLabelAttr>())
     CGM.ErrorUnsupported(&D, "__asm__");
   
+  // We don't support __thread yet.
+  if (D.isThreadSpecified())
+    CGM.ErrorUnsupported(&D, "__thread variable", true);
+  
   switch (D.getStorageClass()) {
   case VarDecl::Static:
     return EmitStaticBlockVarDecl(D);