From e9003e3fedd716b7d7c8e7f7e15d4c33b3584f1f Mon Sep 17 00:00:00 2001
From: Tony Theodore <tonyt@logyst.com>
Date: Tue, 25 Jul 2017 21:09:02 +1000
Subject: cmake: add option to disable -isystem

Alternative to #1811, this seems like it should be fixed upstream
in gcc/cmake rather than individual packages
---
 src/cmake-1-fixes.patch | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/src/cmake-1-fixes.patch b/src/cmake-1-fixes.patch
index 59a350b..c6f683a 100644
--- a/src/cmake-1-fixes.patch
+++ b/src/cmake-1-fixes.patch
@@ -17,3 +17,30 @@ index 1111111..2222222 100644
 @@ -1 +1 @@
 -set(CMAKE_RC_COMPILE_OBJECT "<CMAKE_RC_COMPILER> -O coff <DEFINES> <INCLUDES> <FLAGS> <SOURCE> <OBJECT>")
 +set(CMAKE_RC_COMPILE_OBJECT "<CMAKE_RC_COMPILER> -O coff <DEFINES> <INCLUDES> <SOURCE> <OBJECT>")
+
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Tony Theodore <tonyt@logyst.com>
+Date: Tue, 25 Jul 2017 20:34:56 +1000
+Subject: [PATCH] add option to disable -isystem
+
+taken from (not accepted):
+https://gitlab.kitware.com/cmake/cmake/merge_requests/895
+
+see also:
+https://gitlab.kitware.com/cmake/cmake/issues/16291
+https://gitlab.kitware.com/cmake/cmake/issues/16919
+
+
+diff --git a/Modules/Compiler/GNU.cmake b/Modules/Compiler/GNU.cmake
+index 1111111..2222222 100644
+--- a/Modules/Compiler/GNU.cmake
++++ b/Modules/Compiler/GNU.cmake
+@@ -42,7 +42,7 @@ macro(__compiler_gnu lang)
+   string(APPEND CMAKE_${lang}_FLAGS_RELWITHDEBINFO_INIT " -O2 -g -DNDEBUG")
+   set(CMAKE_${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
++  if(NOT APPLE OR NOT CMAKE_${lang}_COMPILER_VERSION VERSION_LESS 4 AND (NOT MXE_DISABLE_INCLUDE_SYSTEM_FLAG)) # work around #4462
+     set(CMAKE_INCLUDE_SYSTEM_FLAG_${lang} "-isystem ")
+   endif()
+ endmacro()
-- 
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