From bcefeae5c1215377130c16e03a247ce84f2eef10 Mon Sep 17 00:00:00 2001
From: Bill Wendling <isanbard@gmail.com>
Date: Tue, 29 Nov 2011 00:10:10 +0000
Subject: [PATCH] The _setjmp builtin library function should have the "returns
 twice" attribute. This prevents the stack slot allocator from coming along
 and using a stack which it thinks is available but isn't.
 <rdar://problem/10492556>

llvm-svn: 145332
---
 clang/lib/CodeGen/CGObjCMac.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/clang/lib/CodeGen/CGObjCMac.cpp b/clang/lib/CodeGen/CGObjCMac.cpp
index 1cbcc58ae5f3..1db50a8f578e 100644
--- a/clang/lib/CodeGen/CGObjCMac.cpp
+++ b/clang/lib/CodeGen/CGObjCMac.cpp
@@ -516,7 +516,8 @@ public:
     llvm::Type *params[] = { CGM.Int32Ty->getPointerTo() };
     return CGM.CreateRuntimeFunction(llvm::FunctionType::get(CGM.Int32Ty,
                                                              params, false),
-                                     "_setjmp");
+                                     "_setjmp",
+                                     llvm::Attribute::ReturnsTwice);
   }
 
 public: