From ab1b983fe3e15b9af0d885da72c8f5f32934c751 Mon Sep 17 00:00:00 2001
From: Joel Self <self@jself.io>
Date: Tue, 6 Sep 2016 09:52:55 -0600
Subject: [PATCH] Added a check for C++11 support. If not supported a warning
 is printed and tests are not compiled.

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

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5b3b82cf..1b11d762 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -46,6 +46,13 @@ endif ()
 
 project (FANN)
 
+INCLUDE(CheckCXXCompilerFlag)
+CHECK_CXX_COMPILER_FLAG(-std=c++11 COMPILER_SUPPORTS_CXX11)
+
+IF(NOT COMPILER_SUPPORTS_CXX11)
+  message(WARNING "The compiler ${CMAKE_CXX_COMPILER} has no C++11 support. Tests will not be compiled. To enable tests use a compiler that supports C++11.")
+ENDIF()
+
 list (APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake/Modules)
 
 set (FANN_VERSION_MAJOR 2)
@@ -142,6 +149,9 @@ install (FILES
 ################# compile tests ################
 
 ADD_SUBDIRECTORY( lib/googletest )
-ADD_SUBDIRECTORY( tests )
+
+if(COMPILER_SUPPORTS_CXX11)
+  ADD_SUBDIRECTORY( tests )
+endif()
 
 ENDIF()