From 19b0fc0a6b66f83154047a8ac43e66086e63610e Mon Sep 17 00:00:00 2001
From: Alex James <theracermaster@gmail.com>
Date: Mon, 17 Dec 2018 20:25:13 -0800
Subject: StdLib/Environs: Avoid infinite recursion in _Exit

Use __builtin_unreachable instead of infinite recursion to fix an
infinite recursion error when building StdLib with XCODE5/CLANG38.

Cc: Daryl McDaniel <edk2-lists@mc2research.org>
Cc: Jaben Carsey <jaben.carsey@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Alex James <theracermaster@gmail.com>
Reviewed-by: Jaben Carsey <jaben.carsey@intel.com>
---
 StdLib/LibC/StdLib/Environs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/StdLib/LibC/StdLib/Environs.c b/StdLib/LibC/StdLib/Environs.c
index 15221a1260..a29cb9954c 100644
--- a/StdLib/LibC/StdLib/Environs.c
+++ b/StdLib/LibC/StdLib/Environs.c
@@ -120,7 +120,7 @@ _Exit(int status)
   longjmp(gMD->MainExit, 0x55);     // Get out of here.  longjmp can't return 0. Use 0x55 for a non-zero value.
 
 #ifdef __GNUC__
-  _Exit(status);        /* Keep GCC happy - never reached */
+  __builtin_unreachable ();         // Keep GCC happy
 #endif
 }
 
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