89a6e3cf7a
Also moves helper functions into a module file and replaces JOIN generator expressions with list(TRANSFORM) commands in order to get the correct sources list at the configure stage.
83 lines
3.3 KiB
CMake
83 lines
3.3 KiB
CMake
# 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 "${_args}")
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endif()
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endmacro()
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function(select_cxx_standard _target _minimal_supported_version)
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message(STATUS "Compiler default is C++${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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# if it is unset, select the default if it is sufficient or the ${_minimal_supported_version}
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if (NOT ${_std})
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if (${CMAKE_CXX_STANDARD_DEFAULT} GREATER_EQUAL ${_minimal_supported_version})
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set(_std ${CMAKE_CXX_STANDARD_DEFAULT})
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else()
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set(_std ${_minimal_supported_version})
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endif()
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else()
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if (${_std} LESS ${_minimal_supported_version})
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message(FATAL_ERROR "Sorry, C++${_std} is not supported by libtorrent")
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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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