[CMake] Using CMAKE_CXX_KNOWN_FEATURES

[Andrew Maclean]

Is this a reasonable approach to using cx_11 features on multiple platforms?
The issue is that I think you need to manually select the MSVC compiler
version that supports these features target_compile_features only works for
gcc.

#------------------------------------------
project(nullptr)

#-----------------------------------------------------------------------------
# We will enforce an out of source build.
string(COMPARE EQUAL "${${project_name}_source_dir}"
  "${${PROJECT_NAME}_BINARY_DIR}" INSOURCE)
if(INSOURCE)
  message(FATAL_ERROR "${PROJECT_NAME} requires an out of source build.
Please create a separate binary directory and run CMake there.")
endif(INSOURCE)

#-----------------------------------------------------------------------------
# Don't build anything unless the version of CMake is high enough.
cmake_minimum_required(VERSION 2.8)

#-----------------------------------------------------------------------------
# Directory where the CMakeFiles are
set ( CMAKE_FILE_DIR
  ${PROJECT_SOURCE_DIR}/CMake
)

#-----------------------------------------------------------------------------
# Includes.
set ( INCS
)

#-----------------------------------------------------------------------------
# Sources.
set ( SRCS
  main.cpp
)

get_property(cxx_features GLOBAL PROPERTY CMAKE_CXX_KNOWN_FEATURES)
message(STATUS "This CMake version supports these C++ features:")
foreach(i ${cxx_features})
  message(STATUS "${i}")
endforeach()
message(STATUS "Compiler ID/Version: ${CMAKE_CXX_COMPILER_ID}
${CMAKE_CXX_COMPILER_VERSION}")
#-----------------------------------------------------------------------------
# Includes.
set ( INCS
)

#-----------------------------------------------------------------------------
# Sources.
set ( SRCS
  main.cpp
)

set(needed_features
    cxx_lambdas
    cxx_nullptr)

# We may need to define flags based on the needed features.
foreach(i ${needed_features})
  string(TOUPPER ${i} s)
  add_definitions("-D${s}")
endforeach()

if(UNIX)
  add_executable(${PROJECT_NAME} ${SRCS} ${INCS})
  target_compile_features(${PROJECT_NAME} PUBLIC ${needed_features})
elseif (MSVC_VERSION GREATER "1700")
  # Pick a MSVC version that supports what you need.
  add_executable(${PROJECT_NAME} ${SRCS} ${INCS})
else()
    message(FATAL_ERROR "No suitable compiler exists.")
endif()

#------------------------------------------


-- 
___________________________________________
Andrew J. P. Maclean

___________________________________________
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