From 37df90a474a59fd1a9d94147fdd5e618774f72d9 Mon Sep 17 00:00:00 2001
From: Bob Wilson <bob.wilson@apple.com>
Date: Fri, 6 Jan 2017 02:26:33 +0000
Subject: [PATCH] Revert "Use _Unwind_Backtrace on Apple platforms."

This reverts commit 63165f6ae3bac1623be36d4b3ce63afa1d51a30a.

After making this change, I discovered that _Unwind_Backtrace is
unable to unwind past a signal handler after an assertion failure.
I filed a bug report about that issue in rdar://29866587 but even if
we get a fix soon, it will be awhile before it get released.

llvm-svn: 291207
---
 llvm/lib/Support/Unix/Signals.inc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/llvm/lib/Support/Unix/Signals.inc b/llvm/lib/Support/Unix/Signals.inc
index 3750d7f4c09d..9752b70644c6 100644
--- a/llvm/lib/Support/Unix/Signals.inc
+++ b/llvm/lib/Support/Unix/Signals.inc
@@ -48,7 +48,7 @@
 // _Unwind_Backtrace function, but on FreeBSD the configure test passes
 // despite the function not existing, and on Android, <unwind.h> conflicts
 // with <link.h>.
-#if defined(__GLIBC__) || defined(__APPLE__)
+#ifdef __GLIBC__
 #include <unwind.h>
 #else
 #undef HAVE__UNWIND_BACKTRACE