From e79027816d9591a7818e7c4490b0b2d3735f0c1e Mon Sep 17 00:00:00 2001
From: Micooz <Micooz@hotmail.com>
Date: Tue, 16 Jun 2015 21:42:59 +0800
Subject: [PATCH] Enhance: c++11 support check when using CMake.

---
 CMakeLists.txt | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index daa5d7e..eaa0f76 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -2,7 +2,17 @@ cmake_minimum_required(VERSION 2.8)
 project (easypr)
 
 # c++11 required
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
+include(CheckCXXCompilerFlag)
+CHECK_CXX_COMPILER_FLAG("-std=c++11" COMPILER_SUPPORTS_CXX11)
+CHECK_CXX_COMPILER_FLAG("-std=c++0x" COMPILER_SUPPORTS_CXX0X)
+
+if(COMPILER_SUPPORTS_CXX11)
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
+elseif(COMPILER_SUPPORTS_CXX0X)
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++0x")
+else()
+    message(STATUS "The compiler ${CMAKE_CXX_COMPILER} doesn’t support C++11. Please upgrade or use a different C++ compiler.")
+endif()
 
 # opencv package required
 find_package(OpenCV REQUIRED)