Add C++11 compiler support detection feature
This is currently copied from http://quickgit.kde.org/index.php?p=scratch%2Fdakon%2Fcmake-cxx11.git but there is a chance that in future it will be merged into CMake proper.
This commit is contained in:
Matt Williams
132
cmake/Modules/CheckCXX11Features.cmake
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132
cmake/Modules/CheckCXX11Features.cmake
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# - Check which parts of the C++11 standard the compiler supports
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#
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# When found it will set the following variables
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#
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# CXX11_COMPILER_FLAGS - the compiler flags needed to get C++11 features
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#
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# HAS_CXX11_AUTO - auto keyword
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# HAS_CXX11_AUTO_RET_TYPE - function declaration with deduced return types
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# HAS_CXX11_CLASS_OVERRIDE - override and final keywords for classes and methods
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# HAS_CXX11_CONSTEXPR - constexpr keyword
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# HAS_CXX11_CSTDINT_H - cstdint header
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# HAS_CXX11_DECLTYPE - decltype keyword
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# HAS_CXX11_FUNC - __func__ preprocessor constant
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# HAS_CXX11_INITIALIZER_LIST - initializer list
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# HAS_CXX11_LAMBDA - lambdas
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# HAS_CXX11_LIB_REGEX - regex library
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# HAS_CXX11_LONG_LONG - long long signed & unsigned types
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# HAS_CXX11_NULLPTR - nullptr
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# HAS_CXX11_RVALUE_REFERENCES - rvalue references
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# HAS_CXX11_SIZEOF_MEMBER - sizeof() non-static members
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# HAS_CXX11_STATIC_ASSERT - static_assert()
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# HAS_CXX11_VARIADIC_TEMPLATES - variadic templates
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#=============================================================================
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# Copyright 2011,2012 Rolf Eike Beer <eike@sf-mail.de>
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# Copyright 2012 Andreas Weis
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#
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# Distributed under the OSI-approved BSD License (the "License");
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# see accompanying file Copyright.txt for details.
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#
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# This software is distributed WITHOUT ANY WARRANTY; without even the
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# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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# See the License for more information.
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#=============================================================================
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# (To distribute this file outside of CMake, substitute the full
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# License text for the above reference.)
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if (NOT CMAKE_CXX_COMPILER_LOADED)
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message(FATAL_ERROR "CheckCXX11Features modules only works if language CXX is enabled")
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endif ()
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cmake_minimum_required(VERSION 2.8.3)
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#
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### Check for needed compiler flags
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#
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include(CheckCXXCompilerFlag)
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check_cxx_compiler_flag("-std=c++11" _HAS_CXX11_FLAG)
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if (NOT _HAS_CXX11_FLAG)
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check_cxx_compiler_flag("-std=c++0x" _HAS_CXX0X_FLAG)
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endif ()
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if (_HAS_CXX11_FLAG)
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set(CXX11_COMPILER_FLAGS "-std=c++11")
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elseif (_HAS_CXX0X_FLAG)
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set(CXX11_COMPILER_FLAGS "-std=c++0x")
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endif ()
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function(cxx11_check_feature FEATURE_NAME RESULT_VAR)
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if (NOT DEFINED ${RESULT_VAR})
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set(_bindir "${CMAKE_CURRENT_BINARY_DIR}/cxx11_${FEATURE_NAME}")
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set(_SRCFILE_BASE ${CMAKE_CURRENT_LIST_DIR}/CheckCXX11Features/cxx11-test-${FEATURE_NAME})
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set(_LOG_NAME "\"${FEATURE_NAME}\"")
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message(STATUS "Checking C++11 support for ${_LOG_NAME}")
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set(_SRCFILE "${_SRCFILE_BASE}.cpp")
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set(_SRCFILE_FAIL "${_SRCFILE_BASE}_fail.cpp")
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set(_SRCFILE_FAIL_COMPILE "${_SRCFILE_BASE}_fail_compile.cpp")
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if (CROSS_COMPILING)
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try_compile(${RESULT_VAR} "${_bindir}" "${_SRCFILE}"
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COMPILE_DEFINITIONS "${CXX11_COMPILER_FLAGS}")
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if (${RESULT_VAR} AND EXISTS ${_SRCFILE_FAIL})
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try_compile(${RESULT_VAR} "${_bindir}_fail" "${_SRCFILE_FAIL}"
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COMPILE_DEFINITIONS "${CXX11_COMPILER_FLAGS}")
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endif (${RESULT_VAR} AND EXISTS ${_SRCFILE_FAIL})
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else (CROSS_COMPILING)
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try_run(_RUN_RESULT_VAR _COMPILE_RESULT_VAR
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"${_bindir}" "${_SRCFILE}"
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COMPILE_DEFINITIONS "${CXX11_COMPILER_FLAGS}")
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if (_COMPILE_RESULT_VAR AND NOT _RUN_RESULT_VAR)
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set(${RESULT_VAR} TRUE)
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else (_COMPILE_RESULT_VAR AND NOT _RUN_RESULT_VAR)
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set(${RESULT_VAR} FALSE)
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endif (_COMPILE_RESULT_VAR AND NOT _RUN_RESULT_VAR)
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if (${RESULT_VAR} AND EXISTS ${_SRCFILE_FAIL})
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try_run(_RUN_RESULT_VAR _COMPILE_RESULT_VAR
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"${_bindir}_fail" "${_SRCFILE_FAIL}"
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COMPILE_DEFINITIONS "${CXX11_COMPILER_FLAGS}")
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if (_COMPILE_RESULT_VAR AND _RUN_RESULT_VAR)
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set(${RESULT_VAR} TRUE)
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else (_COMPILE_RESULT_VAR AND _RUN_RESULT_VAR)
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set(${RESULT_VAR} FALSE)
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endif (_COMPILE_RESULT_VAR AND _RUN_RESULT_VAR)
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endif (${RESULT_VAR} AND EXISTS ${_SRCFILE_FAIL})
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endif (CROSS_COMPILING)
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if (${RESULT_VAR} AND EXISTS ${_SRCFILE_FAIL_COMPILE})
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try_compile(_TMP_RESULT "${_bindir}_fail_compile" "${_SRCFILE_FAIL_COMPILE}"
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COMPILE_DEFINITIONS "${CXX11_COMPILER_FLAGS}")
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if (_TMP_RESULT)
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set(${RESULT_VAR} FALSE)
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else (_TMP_RESULT)
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set(${RESULT_VAR} TRUE)
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endif (_TMP_RESULT)
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endif (${RESULT_VAR} AND EXISTS ${_SRCFILE_FAIL_COMPILE})
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if (${RESULT_VAR})
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message(STATUS "Checking C++11 support for ${_LOG_NAME}: works")
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else (${RESULT_VAR})
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message(STATUS "Checking C++11 support for ${_LOG_NAME}: not supported")
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endif (${RESULT_VAR})
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set(${RESULT_VAR} ${${RESULT_VAR}} CACHE INTERNAL "C++11 support for ${_LOG_NAME}")
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endif (NOT DEFINED ${RESULT_VAR})
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endfunction(cxx11_check_feature)
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cxx11_check_feature("__func__" HAS_CXX11_FUNC)
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cxx11_check_feature("auto" HAS_CXX11_AUTO)
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cxx11_check_feature("auto_ret_type" HAS_CXX11_AUTO_RET_TYPE)
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cxx11_check_feature("class_override_final" HAS_CXX11_CLASS_OVERRIDE)
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cxx11_check_feature("constexpr" HAS_CXX11_CONSTEXPR)
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cxx11_check_feature("cstdint" HAS_CXX11_CSTDINT_H)
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cxx11_check_feature("decltype" HAS_CXX11_DECLTYPE)
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cxx11_check_feature("initializer_list" HAS_CXX11_INITIALIZER_LIST)
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cxx11_check_feature("lambda" HAS_CXX11_LAMBDA)
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cxx11_check_feature("long_long" HAS_CXX11_LONG_LONG)
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cxx11_check_feature("nullptr" HAS_CXX11_NULLPTR)
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cxx11_check_feature("regex" HAS_CXX11_LIB_REGEX)
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cxx11_check_feature("rvalue-references" HAS_CXX11_RVALUE_REFERENCES)
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cxx11_check_feature("sizeof_member" HAS_CXX11_SIZEOF_MEMBER)
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cxx11_check_feature("static_assert" HAS_CXX11_STATIC_ASSERT)
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cxx11_check_feature("variadic_templates" HAS_CXX11_VARIADIC_TEMPLATES)
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