diff --git a/test/CodeGenCXX/attr.cpp b/test/CodeGenCXX/attr.cpp
index 4c781c6..d689a4f 100644
--- a/test/CodeGenCXX/attr.cpp
+++ b/test/CodeGenCXX/attr.cpp
@@ -1,5 +1,7 @@
 // RUN: %clang_cc1 -triple x86_64-apple-darwin -emit-llvm -o - %s | FileCheck %s
 
+// CHECK: @test2 = alias i32 ()* @_Z5test1v
+
 // CHECK: define i32 @_Z3foov() nounwind align 1024
 int foo() __attribute__((aligned(1024)));
 int foo() { }
@@ -18,3 +20,9 @@
 
 // CHECK: define void @_ZN1C4bar3Ev(%class.C* %this) nounwind align 1024
 void C::bar3() { }
+
+// PR6635
+// CHECK: define i32 @_Z5test1v()
+int test1() { return 10; }
+// CHECK at top of file
+extern "C" int test2() __attribute__((alias("_Z5test1v")));