forked from premiere/premiere-libtorrent
cmake: allow selecting C++ standard version during build
This backports commit 8e72fad3c to the RC_1_1 branch, taking into account that C++98 is allowed for RC_1_1 with older boost versions.
This commit is contained in:
Eugene Shalygin
Arvid Norberg
parent
9415467dd8
commit
b91c595b43
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@ -8,9 +8,9 @@ project(libtorrent
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set (SOVERSION "9")
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list(APPEND CMAKE_MODULE_PATH ${libtorrent_SOURCE_DIR}/cmake/Modules)
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include(FeatureSummary)
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include(GNUInstallDirs)
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include(GeneratePkgConfig)
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include(LibtorrentMacros)
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set(sources
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web_connection_base
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@ -165,55 +165,14 @@ set(ed25519_sources
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set(includes include ed25519/src)
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function(list_prepend _listName _prefix)
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string(REGEX REPLACE "([^;]+)" "${_prefix}\\1" _tmp_list "${${_listName}}")
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set (${_listName} "${_tmp_list}" PARENT_SCOPE)
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endfunction()
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list_prepend(sources "src/")
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list_prepend(kademlia_sources "src/kademlia/")
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list_prepend(ed25519_sources "ed25519/src/")
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function(target_optional_compile_definitions _target _scope)
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set(options FEATURE)
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set(oneValueArgs NAME DESCRIPTION DEFAULT)
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set(multiValueArgs ENABLED DISABLED)
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cmake_parse_arguments(TOCD ${options} "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
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option(${TOCD_NAME} "${TOCD_DESCRIPTION}" ${TOCD_DEFAULT})
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if (${${TOCD_NAME}})
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target_compile_definitions(${_target} ${_scope} ${TOCD_ENABLED})
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else()
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target_compile_definitions(${_target} ${_scope} ${TOCD_DISABLED})
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endif()
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if(${TOCD_FEATURE})
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add_feature_info(${TOCD_NAME} ${TOCD_NAME} "${TOCD_DESCRIPTION}")
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endif()
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endfunction()
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macro(feature_option _name _description _default)
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option(${_name} "${_description}" ${_default})
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add_feature_info(${_name} ${_name} "${_description}")
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endmacro()
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# these options control target creation and thus have to be declared before the add_library() call
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feature_option(BUILD_SHARED_LIBS "build libtorrent as a shared library" ON)
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feature_option(static_runtime "build libtorrent with static runtime" OFF)
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macro(find_public_dependency _name)
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find_package(${_name} ${ARGN})
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string(TOUPPER "${_name}" _name_uppercased)
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if (${_name}_FOUND OR ${_name_uppercased}_FOUND)
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# Dependencies to be used below for generating Config.cmake file
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# We don't need the 'REQUIRED' argument there
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set(_args "${_name}")
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list(APPEND _args "${ARGN}")
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list(REMOVE_ITEM _args "REQUIRED")
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list(REMOVE_ITEM _args "") # just in case
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string(REPLACE ";" " " _args "${_args}")
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list(APPEND _package_dependencies "${_args}")
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endif()
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endmacro()
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find_public_dependency(Threads REQUIRED)
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if(static_runtime)
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@ -319,6 +278,7 @@ option(tcmalloc "link against google performance tools tcmalloc" OFF)
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# 1. With C++11 onward, we require Boost system component, with C++03 we need chrono and random components too
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# 2. When building against boost 1.66 and newer, C++11 is required.
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set(minimal_required_cxx_standard 98)
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# For the first requirement we do:
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set(required_boost_components system)
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if (NOT cxx_std_11 IN_LIST CMAKE_CXX_COMPILE_FEATURES)
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@ -331,20 +291,14 @@ target_link_libraries(torrent-rasterbar PUBLIC ${Boost_SYSTEM_LIBRARY})
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# now test the second requirement:
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if (Boost_VERSION VERSION_GREATER_EQUAL 106600)
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set(minimal_required_cxx_standard 11)
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if (NOT cxx_std_11 IN_LIST CMAKE_CXX_COMPILE_FEATURES)
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message(FATAL_ERROR "When building against boost 1.66 and newer, C++11 is required,\n"
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"and your compiler does not support that")
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endif()
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endif()
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# selecting C++14/11 mode if available
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if (cxx_std_14 IN_LIST CMAKE_CXX_COMPILE_FEATURES)
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target_compile_features(torrent-rasterbar PUBLIC cxx_std_14)
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message(STATUS "Building in C++14 mode")
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elseif(cxx_std_11 IN_LIST CMAKE_CXX_COMPILE_FEATURES)
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target_compile_features(torrent-rasterbar PUBLIC cxx_std_11)
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message(STATUS "Building in C++11 mode")
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endif()
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select_cxx_standard(torrent-rasterbar ${minimal_required_cxx_standard})
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target_link_libraries(torrent-rasterbar PUBLIC ${Boost_LIBRARIES})
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@ -123,6 +123,7 @@ EXTRA_DIST = \
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README.rst \
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cmake/Modules/FindLibGcrypt.cmake \
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cmake/Modules/GeneratePkgConfig.cmake \
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cmake/Modules/LibtorrentMacros.cmake \
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cmake/Modules/ucm_flags.cmake \
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cmake/Modules/GeneratePkgConfig/generate-pkg-config.cmake.in \
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cmake/Modules/GeneratePkgConfig/pkg-config.cmake.in \
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@ -0,0 +1,102 @@
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# Various helper function and macros for building libtorrent
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include(FeatureSummary)
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# macro for issuing option() and add_feature_info() in a single call.
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# Synopsis:
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# feature_option(<option_and_feature_name> <option_and_feature_description> <default_option_value>)
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macro(feature_option _name _description _default)
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option(${_name} "${_description}" ${_default})
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add_feature_info(${_name} ${_name} "${_description}")
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endmacro()
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# function to add a simple build option which controls compile definition(s) for a target.
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# Synopsis:
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# target_optional_compile_definitions(<target> [FEATURE]
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# NAME <name> DESCRIPTION <description> DEFAULT <default_value>
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# [ENABLED [enabled_compile_definitions...]]
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# [DISABLED [disabled_compile_defnitions...]]
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# )
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# NAME, DESCRIPTION and DEFAULT are passed to option() call
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# if FEATURE is given, they are passed to add_feature_info()
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# ENABLED lists compile definitions that will be set on <target> when option is enabled,
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# DISABLED lists definitions that will be set otherwise
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function(target_optional_compile_definitions _target _scope)
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set(options FEATURE)
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set(oneValueArgs NAME DESCRIPTION DEFAULT)
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set(multiValueArgs ENABLED DISABLED)
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cmake_parse_arguments(TOCD ${options} "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
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option(${TOCD_NAME} "${TOCD_DESCRIPTION}" ${TOCD_DEFAULT})
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if (${${TOCD_NAME}})
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target_compile_definitions(${_target} ${_scope} ${TOCD_ENABLED})
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else()
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target_compile_definitions(${_target} ${_scope} ${TOCD_DISABLED})
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endif()
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if(${TOCD_FEATURE})
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add_feature_info(${TOCD_NAME} ${TOCD_NAME} "${TOCD_DESCRIPTION}")
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endif()
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endfunction()
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# a helper macro that calls find_package() and appends the package (if found) to the
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# _package_dependencies list, which can be used later to generate package config file
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macro(find_public_dependency _name)
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find_package(${_name} ${ARGN})
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string(TOUPPER "${_name}" _name_uppercased)
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if (${_name}_FOUND OR ${_name_uppercased}_FOUND)
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# Dependencies to be used below for generating Config.cmake file
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# We don't need the 'REQUIRED' argument there
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set(_args "${_name}")
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list(APPEND _args "${ARGN}")
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list(REMOVE_ITEM _args "REQUIRED")
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list(REMOVE_ITEM _args "") # just in case
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string(REPLACE ";" " " _args "${_args}")
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list(APPEND _package_dependencies "${_args}")
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endif()
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endmacro()
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function(_cxx_standard_to_year _yearVar _std)
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if (${_std} GREATER 97)
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math(EXPR _year "1900 + ${_std}")
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else()
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math(EXPR _year "2000 + ${_std}")
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endif()
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set(${_yearVar} ${_year} PARENT_SCOPE)
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endfunction()
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function(select_cxx_standard _target _minimal_supported_version)
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message(STATUS "Compiler default is C++${CMAKE_CXX_STANDARD_DEFAULT}")
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# make the CXX_STANDARD property public to ensure it makes it into the pkg-config file
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get_target_property(_std ${_target} CXX_STANDARD)
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# RC_1_1 still supports C++98, which is lower version than C++11. Thus we convert std
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# version to year value and compare years
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_cxx_standard_to_year(minimal_supported_version_year ${_minimal_supported_version})
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# if it is unset, select the default if it is sufficient or the ${_minimal_supported_version}
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if (NOT ${_std})
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_cxx_standard_to_year(std_default_year ${CMAKE_CXX_STANDARD_DEFAULT})
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if (${std_default_year} GREATER_EQUAL ${minimal_supported_version_year})
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set(_std ${CMAKE_CXX_STANDARD_DEFAULT})
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else()
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set(_std ${_minimal_supported_version})
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endif()
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else()
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_cxx_standard_to_year(std_year ${_std})
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if (${std_year} LESS ${minimal_supported_version_year})
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message(SEND_ERROR "Sorry, C++${_std} is not supported by libtorrent with the given Boost version")
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message(FATAL_ERROR "The minimal supported C++ standard version is C++${_minimal_supported_version}")
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endif()
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endif()
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if (cxx_std_${_std} IN_LIST CMAKE_CXX_COMPILE_FEATURES)
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# force this standard
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target_compile_features(${_target} PUBLIC cxx_std_${_std})
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else()
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message(FATAL_ERROR "Requested C++ standard version (${_std}) is not supported by the compiler")
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endif()
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message(STATUS "Building in C++${_std} mode")
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endfunction()
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function(list_prepend _listName _prefix)
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string(REGEX REPLACE "([^;]+)" "${_prefix}\\1" _tmp_list "${${_listName}}")
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set (${_listName} "${_tmp_list}" PARENT_SCOPE)
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endfunction()
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