ferencd@0: # - Check which parts of the C++11 standard the compiler supports
ferencd@0: #
ferencd@0: # When found it will set the following variables
ferencd@0: #
ferencd@0: #  CXX11_COMPILER_FLAGS         - the compiler flags needed to get C++11 features
ferencd@0: #
ferencd@0: #  HAS_CXX11_AUTO               - auto keyword
ferencd@0: #  HAS_CXX11_AUTO_RET_TYPE      - function declaration with deduced return types
ferencd@0: #  HAS_CXX11_CLASS_OVERRIDE     - override and final keywords for classes and methods
ferencd@0: #  HAS_CXX11_CONSTEXPR          - constexpr keyword
ferencd@0: #  HAS_CXX11_CSTDINT_H          - cstdint header
ferencd@0: #  HAS_CXX11_DECLTYPE           - decltype keyword
ferencd@0: #  HAS_CXX11_FUNC               - __func__ preprocessor constant
ferencd@0: #  HAS_CXX11_INITIALIZER_LIST   - initializer list
ferencd@0: #  HAS_CXX11_LAMBDA             - lambdas
ferencd@0: #  HAS_CXX11_LIB_REGEX          - regex library
ferencd@0: #  HAS_CXX11_LONG_LONG          - long long signed & unsigned types
ferencd@0: #  HAS_CXX11_NULLPTR            - nullptr
ferencd@0: #  HAS_CXX11_RVALUE_REFERENCES  - rvalue references
ferencd@0: #  HAS_CXX11_SIZEOF_MEMBER      - sizeof() non-static members
ferencd@0: #  HAS_CXX11_STATIC_ASSERT      - static_assert()
ferencd@0: #  HAS_CXX11_VARIADIC_TEMPLATES - variadic templates
ferencd@0: 
ferencd@0: #=============================================================================
ferencd@0: # Copyright 2011,2012 Rolf Eike Beer <eike@sf-mail.de>
ferencd@0: # Copyright 2012 Andreas Weis
ferencd@0: #
ferencd@0: # Distributed under the OSI-approved BSD License (the "License");
ferencd@0: # see accompanying file Copyright.txt for details.
ferencd@0: #
ferencd@0: # This software is distributed WITHOUT ANY WARRANTY; without even the
ferencd@0: # implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
ferencd@0: # See the License for more information.
ferencd@0: #=============================================================================
ferencd@0: # (To distribute this file outside of CMake, substitute the full
ferencd@0: #  License text for the above reference.)
ferencd@0: 
ferencd@0: #
ferencd@0: # Each feature may have up to 3 checks, every one of them in it's own file
ferencd@0: # FEATURE.cpp              - example that must build and return 0 when run
ferencd@0: # FEATURE_fail.cpp         - example that must build, but may not return 0 when run
ferencd@0: # FEATURE_fail_compile.cpp - example that must fail compilation
ferencd@0: #
ferencd@0: # The first one is mandatory, the latter 2 are optional and do not depend on
ferencd@0: # each other (i.e. only one may be present).
ferencd@0: #
ferencd@0: 
ferencd@0: if (NOT CMAKE_CXX_COMPILER_LOADED)
ferencd@0:     message(FATAL_ERROR "CheckCXX11Features modules only works if language CXX is enabled")
ferencd@0: endif ()
ferencd@0: 
ferencd@0: cmake_minimum_required(VERSION 2.8.3)
ferencd@0: 
ferencd@0: #
ferencd@0: ### Check for needed compiler flags
ferencd@0: #
ferencd@0: include(CheckCXXCompilerFlag)
ferencd@0: check_cxx_compiler_flag("-std=c++11" _HAS_CXX11_FLAG)
ferencd@0: if (NOT _HAS_CXX11_FLAG)
ferencd@0:     check_cxx_compiler_flag("-std=c++0x" _HAS_CXX0X_FLAG)
ferencd@0: endif ()
ferencd@0: 
ferencd@0: if (_HAS_CXX11_FLAG)
ferencd@0:     set(CXX11_COMPILER_FLAGS "-std=c++11")
ferencd@0: elseif (_HAS_CXX0X_FLAG)
ferencd@0:     set(CXX11_COMPILER_FLAGS "-std=c++0x")
ferencd@0: endif ()
ferencd@0: 
ferencd@0: function(cxx11_check_feature FEATURE_NAME RESULT_VAR)
ferencd@0:     if (NOT DEFINED ${RESULT_VAR})
ferencd@0:         set(_bindir "${CMAKE_CURRENT_BINARY_DIR}/cxx11_${FEATURE_NAME}")
ferencd@0: 
ferencd@0:         set(_SRCFILE_BASE ${CMAKE_CURRENT_LIST_DIR}/CheckCXX11Features/cxx11-test-${FEATURE_NAME})
ferencd@0:         set(_LOG_NAME "\"${FEATURE_NAME}\"")
ferencd@0:         message(STATUS "Checking C++11 support for ${_LOG_NAME}")
ferencd@0: 
ferencd@0:         set(_SRCFILE "${_SRCFILE_BASE}.cpp")
ferencd@0:         set(_SRCFILE_FAIL "${_SRCFILE_BASE}_fail.cpp")
ferencd@0:         set(_SRCFILE_FAIL_COMPILE "${_SRCFILE_BASE}_fail_compile.cpp")
ferencd@0: 
ferencd@0:         if (CROSS_COMPILING)
ferencd@0:             try_compile(${RESULT_VAR} "${_bindir}" "${_SRCFILE}"
ferencd@0:                         COMPILE_DEFINITIONS "${CXX11_COMPILER_FLAGS}")
ferencd@0:             if (${RESULT_VAR} AND EXISTS ${_SRCFILE_FAIL})
ferencd@0:                 try_compile(${RESULT_VAR} "${_bindir}_fail" "${_SRCFILE_FAIL}"
ferencd@0:                             COMPILE_DEFINITIONS "${CXX11_COMPILER_FLAGS}")
ferencd@0:             endif (${RESULT_VAR} AND EXISTS ${_SRCFILE_FAIL})
ferencd@0:         else (CROSS_COMPILING)
ferencd@0:             try_run(_RUN_RESULT_VAR _COMPILE_RESULT_VAR
ferencd@0:                     "${_bindir}" "${_SRCFILE}"
ferencd@0:                     COMPILE_DEFINITIONS "${CXX11_COMPILER_FLAGS}")
ferencd@0:             if (_COMPILE_RESULT_VAR AND NOT _RUN_RESULT_VAR)
ferencd@0:                 set(${RESULT_VAR} TRUE)
ferencd@0:             else (_COMPILE_RESULT_VAR AND NOT _RUN_RESULT_VAR)
ferencd@0:                 set(${RESULT_VAR} FALSE)
ferencd@0:             endif (_COMPILE_RESULT_VAR AND NOT _RUN_RESULT_VAR)
ferencd@0:             if (${RESULT_VAR} AND EXISTS ${_SRCFILE_FAIL})
ferencd@0:                 try_run(_RUN_RESULT_VAR _COMPILE_RESULT_VAR
ferencd@0:                         "${_bindir}_fail" "${_SRCFILE_FAIL}"
ferencd@0:                          COMPILE_DEFINITIONS "${CXX11_COMPILER_FLAGS}")
ferencd@0:                 if (_COMPILE_RESULT_VAR AND _RUN_RESULT_VAR)
ferencd@0:                     set(${RESULT_VAR} TRUE)
ferencd@0:                 else (_COMPILE_RESULT_VAR AND _RUN_RESULT_VAR)
ferencd@0:                     set(${RESULT_VAR} FALSE)
ferencd@0:                 endif (_COMPILE_RESULT_VAR AND _RUN_RESULT_VAR)
ferencd@0:             endif (${RESULT_VAR} AND EXISTS ${_SRCFILE_FAIL})
ferencd@0:         endif (CROSS_COMPILING)
ferencd@0:         if (${RESULT_VAR} AND EXISTS ${_SRCFILE_FAIL_COMPILE})
ferencd@0:             try_compile(_TMP_RESULT "${_bindir}_fail_compile" "${_SRCFILE_FAIL_COMPILE}"
ferencd@0:                         COMPILE_DEFINITIONS "${CXX11_COMPILER_FLAGS}")
ferencd@0:             if (_TMP_RESULT)
ferencd@0:                 set(${RESULT_VAR} FALSE)
ferencd@0:             else (_TMP_RESULT)
ferencd@0:                 set(${RESULT_VAR} TRUE)
ferencd@0:             endif (_TMP_RESULT)
ferencd@0:         endif (${RESULT_VAR} AND EXISTS ${_SRCFILE_FAIL_COMPILE})
ferencd@0: 
ferencd@0:         if (${RESULT_VAR})
ferencd@0:             message(STATUS "Checking C++11 support for ${_LOG_NAME}: works")
ferencd@0:         else (${RESULT_VAR})
ferencd@0:             message(STATUS "Checking C++11 support for ${_LOG_NAME}: not supported")
ferencd@0:         endif (${RESULT_VAR})
ferencd@0:         set(${RESULT_VAR} ${${RESULT_VAR}} CACHE INTERNAL "C++11 support for ${_LOG_NAME}")
ferencd@0:     endif (NOT DEFINED ${RESULT_VAR})
ferencd@0: endfunction(cxx11_check_feature)
ferencd@0: 
ferencd@0: cxx11_check_feature("__func__" HAS_CXX11_FUNC)
ferencd@0: cxx11_check_feature("auto" HAS_CXX11_AUTO)
ferencd@0: cxx11_check_feature("auto_ret_type" HAS_CXX11_AUTO_RET_TYPE)
ferencd@0: cxx11_check_feature("class_override_final" HAS_CXX11_CLASS_OVERRIDE)
ferencd@0: cxx11_check_feature("constexpr" HAS_CXX11_CONSTEXPR)
ferencd@0: cxx11_check_feature("cstdint" HAS_CXX11_CSTDINT_H)
ferencd@0: cxx11_check_feature("decltype" HAS_CXX11_DECLTYPE)
ferencd@0: cxx11_check_feature("initializer_list" HAS_CXX11_INITIALIZER_LIST)
ferencd@0: cxx11_check_feature("lambda" HAS_CXX11_LAMBDA)
ferencd@0: cxx11_check_feature("long_long" HAS_CXX11_LONG_LONG)
ferencd@0: cxx11_check_feature("nullptr" HAS_CXX11_NULLPTR)
ferencd@0: cxx11_check_feature("regex" HAS_CXX11_LIB_REGEX)
ferencd@0: cxx11_check_feature("rvalue-references" HAS_CXX11_RVALUE_REFERENCES)
ferencd@0: cxx11_check_feature("sizeof_member" HAS_CXX11_SIZEOF_MEMBER)
ferencd@0: cxx11_check_feature("static_assert" HAS_CXX11_STATIC_ASSERT)
ferencd@0: cxx11_check_feature("variadic_templates" HAS_CXX11_VARIADIC_TEMPLATES)