Index: include/clang/Basic/Builtins.def
===================================================================
--- include/clang/Basic/Builtins.def
+++ include/clang/Basic/Builtins.def
@@ -448,8 +448,8 @@
 BUILTIN(__builtin_frame_address, "v*IUi", "n")
 BUILTIN(__builtin___clear_cache, "vc*c*", "n")
 BUILTIN(__builtin_flt_rounds, "i", "nc")
-BUILTIN(__builtin_setjmp, "iv**", "j")
-BUILTIN(__builtin_longjmp, "vv**i", "r")
+BUILTIN(__builtin_setjmp, "iv**", "Fj")
+BUILTIN(__builtin_longjmp, "vv**i", "Fr")
 BUILTIN(__builtin_unwind_init, "v", "")
 BUILTIN(__builtin_eh_return_data_regno, "iIi", "nc")
 BUILTIN(__builtin_snprintf, "ic*zcC*.", "nFp:2:")
Index: lib/CodeGen/CGBuiltin.cpp
===================================================================
--- lib/CodeGen/CGBuiltin.cpp
+++ lib/CodeGen/CGBuiltin.cpp
@@ -859,6 +859,8 @@
       return RValue::get(Builder.CreateZExt(Result, Int64Ty, "extend.zext"));
   }
   case Builtin::BI__builtin_setjmp: {
+    if (!getTargetHooks().hasSjLjLowering(*this))
+      break;
     // Buffer is a void**.
     Value *Buf = EmitScalarExpr(E->getArg(0));
 
@@ -881,6 +883,8 @@
     return RValue::get(Builder.CreateCall(F, Buf));
   }
   case Builtin::BI__builtin_longjmp: {
+    if (!getTargetHooks().hasSjLjLowering(*this))
+      break;
     Value *Buf = EmitScalarExpr(E->getArg(0));
     Buf = Builder.CreateBitCast(Buf, Int8PtrTy);
 
Index: lib/CodeGen/TargetInfo.h
===================================================================
--- lib/CodeGen/TargetInfo.h
+++ lib/CodeGen/TargetInfo.h
@@ -225,6 +225,13 @@
   virtual unsigned getOpenMPSimdDefaultAlignment(QualType Type) const {
     return 0;
   }
+
+  /// Control whether __builtin_longjmp / __builtin_setjmp are lowered to
+  /// llvm.eh.sjlj.longjmp / llvm.eh.sjlj.setjmp or the normal library
+  /// function.
+  virtual bool hasSjLjLowering(CodeGen::CodeGenFunction &CGF) const {
+    return false;
+  }
 };
 }
 
Index: lib/CodeGen/TargetInfo.cpp
===================================================================
--- lib/CodeGen/TargetInfo.cpp
+++ lib/CodeGen/TargetInfo.cpp
@@ -665,6 +665,9 @@
     return llvm::ConstantInt::get(CGM.Int32Ty, Sig);
   }
 
+  bool hasSjLjLowering(CodeGen::CodeGenFunction &CGF) const override {
+    return true;
+  }
 };
 
 }
@@ -1599,6 +1602,10 @@
   unsigned getOpenMPSimdDefaultAlignment(QualType) const override {
     return HasAVX ? 32 : 16;
   }
+
+  bool hasSjLjLowering(CodeGen::CodeGenFunction &CGF) const override {
+    return true;
+  }
 };
 
 class PS4TargetCodeGenInfo : public X86_64TargetCodeGenInfo {
@@ -3116,6 +3123,10 @@
   unsigned getOpenMPSimdDefaultAlignment(QualType) const override {
     return 16; // Natural alignment for Altivec vectors.
   }
+
+  bool hasSjLjLowering(CodeGen::CodeGenFunction &CGF) const override {
+    return true;
+  }
 };
 
 }
@@ -3328,6 +3339,10 @@
   unsigned getOpenMPSimdDefaultAlignment(QualType) const override {
     return 16; // Natural alignment for Altivec and VSX vectors.
   }
+
+  bool hasSjLjLowering(CodeGen::CodeGenFunction &CGF) const override {
+    return true;
+  }
 };
 
 class PPC64TargetCodeGenInfo : public DefaultTargetCodeGenInfo {
@@ -3345,6 +3360,10 @@
   unsigned getOpenMPSimdDefaultAlignment(QualType) const override {
     return 16; // Natural alignment for Altivec vectors.
   }
+
+  bool hasSjLjLowering(CodeGen::CodeGenFunction &CGF) const override {
+    return true;
+  }
 };
 
 }
@@ -4462,6 +4481,12 @@
                                               llvm::AttributeSet::FunctionIndex,
                                               B));
   }
+
+  bool hasSjLjLowering(CodeGen::CodeGenFunction &CGF) const override {
+    return false;
+    // FIXME: backend implementation too restricted, even on Darwin.
+    // return CGF.getTarget().getTriple().isOSDarwin();
+  }
 };
 
 class WindowsARMTargetCodeGenInfo : public ARMTargetCodeGenInfo {
Index: test/CodeGen/2003-08-06-BuiltinSetjmpLongjmp.c
===================================================================
--- test/CodeGen/2003-08-06-BuiltinSetjmpLongjmp.c
+++ test/CodeGen/2003-08-06-BuiltinSetjmpLongjmp.c
@@ -1,15 +0,0 @@
-/* RUN: %clang_cc1  %s -emit-llvm -o - | FileCheck %s
- *
- * __builtin_longjmp/setjmp should get transformed into intrinsics.
- */
-
-// CHECK-NOT: builtin_longjmp
-
-void jumpaway(int *ptr) {
-  __builtin_longjmp(ptr,1);
-}
-    
-int main(void) {
-  __builtin_setjmp(0);
-  jumpaway(0);
-}
Index: test/CodeGen/builtin-longjmp.c
===================================================================
--- test/CodeGen/builtin-longjmp.c
+++ test/CodeGen/builtin-longjmp.c
@@ -0,0 +1,36 @@
+// RUN: %clang_cc1 -triple i386-unknown-unknown -emit-llvm < %s| FileCheck %s -check-prefix=SUPPORTED
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown -emit-llvm < %s| FileCheck %s -check-prefix=SUPPORTED
+// RUN: %clang_cc1 -triple powerpc-unknown-unknown -emit-llvm < %s| FileCheck %s -check-prefix=SUPPORTED
+// RUN: %clang_cc1 -triple powerpc64-unknown-unknown -emit-llvm < %s| FileCheck %s -check-prefix=SUPPORTED
+// RUN: %clang_cc1 -triple arm-unknown-unknown -emit-llvm < %s| FileCheck %s -check-prefix=UNSUPPORTED
+// RUN: %clang_cc1 -triple aarch64-unknown-unknown -emit-llvm < %s| FileCheck %s -check-prefix=UNSUPPORTED
+// RUN: %clang_cc1 -triple mips-unknown-unknown -emit-llvm < %s| FileCheck %s -check-prefix=UNSUPPORTED
+// RUN: %clang_cc1 -triple mips64-unknown-unknown -emit-llvm < %s| FileCheck %s -check-prefix=UNSUPPORTED
+
+// Check that __builtin_longjmp and __builtin_setjmp are lowerd into
+// IR intrinsics on those architectures that can handle them.
+// Check that they are lowered to the libcalls on other architectures.
+
+typedef void *jmp_buf;
+jmp_buf buf;
+
+// SUPPORTED:   define{{.*}} void @do_jump()
+// SUPPORTED:   call{{.*}} void @llvm.eh.sjlj.longjmp
+// UNSUPPORTED: define{{.*}} void @do_jump()
+// UNSUPPORTED: call{{.*}} void @longjmp
+
+// SUPPORTED:   define{{.*}} void @do_setjmp()
+// SUPPORTED:   call{{.*}} i32 @llvm.eh.sjlj.setjmp
+// UNSUPPORTED: define{{.*}} void @do_setjmp()
+// UNSUPPORTED: call{{.*}} i32 @setjmp
+
+void do_jump(void) {
+  __builtin_longjmp(buf, 1);
+}
+
+void f(void);
+
+void do_setjmp(void) {
+  if (!__builtin_setjmp(buf))
+    f();
+}