From 4d668f3311896d1b7f06365b3b96e1724a417229 Mon Sep 17 00:00:00 2001
From: Ben Boeckel <ben.boeckel@kitware.com>
Date: Tue, 26 Mar 2013 13:21:37 -0400
Subject: Clang: Add -isystem flag support everywhere

In GNU.cmake, -isystem is not used if APPLE is set. However, Clang has
pretty much always supported -isystem, so we should always use it.

In the future, GNU.cmake should do a version check to see if -isystem is
supported.
---
 Modules/Compiler/Clang.cmake | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Modules/Compiler/Clang.cmake b/Modules/Compiler/Clang.cmake
index 75a971d..c6cd8f8 100644
--- a/Modules/Compiler/Clang.cmake
+++ b/Modules/Compiler/Clang.cmake
@@ -23,4 +23,5 @@ include(Compiler/GNU)
 macro(__compiler_clang lang)
   __compiler_gnu(${lang})
   set(CMAKE_${lang}_COMPILE_OPTIONS_PIE "-fPIE")
+  set(CMAKE_INCLUDE_SYSTEM_FLAG_${lang} "-isystem ")
 endmacro()
-- 
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