From 520d68449f2fd1692f5ca187cf1cf561429a348d Mon Sep 17 00:00:00 2001
From: Andrew Hundt <ATHundt@gmail.com>
Date: Wed, 5 Oct 2016 16:20:30 -0400
Subject: [PATCH] CMake now accepts external toolchain configuration (#4045)

Resolves #4038
Related to https://github.com/ruslo/hunter/pull/529
---
 CMakeLists.txt | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index ad01c211a..29e021806 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -99,7 +99,10 @@ set(FlatBuffers_GRPCTest_SRCS
 # source_group(Compiler FILES ${FlatBuffers_Compiler_SRCS})
 # source_group(Tests FILES ${FlatBuffers_Tests_SRCS})
 
-if(APPLE)
+if(EXISTS "${CMAKE_TOOLCHAIN_FILE}")
+  # do not apply any global settings if the toolchain 
+  # is being configured externally
+elseif(APPLE)
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11 -stdlib=libc++")
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -pedantic -Werror -Wextra")
 elseif(CMAKE_COMPILER_IS_GNUCXX)