Merge pull request #194 from cjee21/cmake

CMake: Version compatibility fixes 2

Author: JeromeMartinez

Project/CMake/Modules/EnableLatestCXX.cmake

@@ -15,7 +15,8 @@ if(NOT "${CMAKE_VERSION}" VERSION_LESS "3.8")
     # Select highest available from list of supported
     set(_known_standards 26 23 20 17 14 11)
     foreach(std ${_known_standards})
-        if("cxx_std_${std}" IN_LIST CMAKE_CXX_COMPILE_FEATURES)
+        list(FIND CMAKE_CXX_COMPILE_FEATURES "cxx_std_${std}" _index)
+        if(NOT _index EQUAL -1)
             target_compile_features(${target} PRIVATE cxx_std_${std})
             message(STATUS "'${target}' is using latest available C++ standard: C++${std}")
             return()
@@ -24,6 +25,13 @@ if(NOT "${CMAKE_VERSION}" VERSION_LESS "3.8")
 
     # Unsupported C++ version
     message(FATAL_ERROR "Compiler ${CMAKE_CXX_COMPILER_ID} does not support C++11 or newer.")
+else()
+    set_target_properties(${target} PROPERTIES
+        CXX_STANDARD 11
+        CXX_STANDARD_REQUIRED YES
+        CXX_EXTENSIONS NO
+    )
+    message(STATUS "${target}: Use CMake > 3.8 to automatically use the latest available C++ standard.")
 endif()
 
 endfunction()