From a84d20abe6bc68f8d1a597a22af1ca98d62a5ce4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Andreas=20M=C3=BCller?= <schnitzeltony at googlemail.com>
Date: Fri, 26 Aug 2016 12:14:12 +0200
Subject: [PATCH] GNU.cmake: replace -isystem by -I
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since gcc6 we see many c++ based packes failing with:

| fatal error: stdlib.h: No such file or directory

a fix from gcc is not to expect [1] so work around

[1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70129

Upstream-Status: Pending

Signed-off-by: Andreas Müller <schnitzeltony at googlemail.com>
---
 Modules/Compiler/GNU.cmake | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/Modules/Compiler/GNU.cmake b/Modules/Compiler/GNU.cmake
index c2d393d..9d1477d 100644
--- a/Modules/Compiler/GNU.cmake
+++ b/Modules/Compiler/GNU.cmake
@@ -53,6 +53,10 @@ macro(__compiler_gnu lang)
   set(CMAKE_${lang}_CREATE_PREPROCESSED_SOURCE "<CMAKE_${lang}_COMPILER> <DEFINES> <INCLUDES> <FLAGS> -E <SOURCE> > <PREPROCESSED_SOURCE>")
   set(CMAKE_${lang}_CREATE_ASSEMBLY_SOURCE "<CMAKE_${lang}_COMPILER> <DEFINES> <INCLUDES> <FLAGS> -S <SOURCE> -o <ASSEMBLY_SOURCE>")
   if(NOT APPLE OR NOT CMAKE_${lang}_COMPILER_VERSION VERSION_LESS 4) # work around #4462
-    set(CMAKE_INCLUDE_SYSTEM_FLAG_${lang} "-isystem ")
+    if("${lang}" STREQUAL "CXX")
+      set(CMAKE_INCLUDE_SYSTEM_FLAG_${lang} "-I ")
+    else()
+      set(CMAKE_INCLUDE_SYSTEM_FLAG_${lang} "-isystem ")
+    endif()
   endif()
 endmacro()
--