cmake to set compiler flags for newer c++ features for the test compi…

…lation

CMakeLists.txt

@@ -141,7 +141,6 @@ install (FILES
 
 ################# compile tests ################
 
-#include_directories("${CMAKE_CURRENT_BINARY_DIR}/lib/googletest/include;${CMAKE_CURRENT_BINARY_DIR}/src/include")
 ADD_SUBDIRECTORY( lib/googletest )
 ADD_SUBDIRECTORY( tests )
 

tests/CMakeLists.txt

@@ -4,15 +4,22 @@ include(CheckCXXCompilerFlag)
 INCLUDE_DIRECTORIES(${CMAKE_SOURCE_DIR}/src/include)
 INCLUDE_DIRECTORIES(${CMAKE_SOURCE_DIR}/lib/googletest/include)
 
+CHECK_CXX_COMPILER_FLAG("-std=c++14" COMPILER_SUPPORTS_CXX14)
 CHECK_CXX_COMPILER_FLAG("-std=c++11" COMPILER_SUPPORTS_CXX11)
 CHECK_CXX_COMPILER_FLAG("-std=c++0x" COMPILER_SUPPORTS_CXX0X)
 if(COMPILER_SUPPORTS_CXX11)
+    message(STATUS "The compiler ${CMAKE_CXX_COMPILER} has C++14 support.")
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++14")
+elseif(COMPILER_SUPPORTS_CXX11)
+    message(STATUS "The compiler ${CMAKE_CXX_COMPILER} has C++11 support.")
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
 elseif(COMPILER_SUPPORTS_CXX0X)
+    message(STATUS "The compiler ${CMAKE_CXX_COMPILER} has C++0x support.")
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++0x")
 else()
-    message(STATUS "The compiler ${CMAKE_CXX_COMPILER} has no C++11 support. Please use a different C++ compiler.")
+    message(STATUS "The compiler ${CMAKE_CXX_COMPILER} has no C++0x, C++11 or C++14 support. FANN will still work with no problem, but the tests will not be able to compile.")
+    return()
 endif()
 
 ADD_EXECUTABLE(fann_tests main.cpp fann_test.cpp fann_test_data.cpp fann_test_train.cpp)
-target_link_libraries(fann_tests gtest doublefann)
+target_link_libraries(fann_tests gtest doublefann)