premiere-libtorrent/cmake/Modules/LibtorrentMacros.cmake

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# Various helper function and macros for building libtorrent
include(FeatureSummary)
# macro for issuing option() and add_feature_info() in a single call.
# Synopsis:
# feature_option(<option_and_feature_name> <option_and_feature_description> <default_option_value>)
macro(feature_option _name _description _default)
option(${_name} "${_description}" ${_default})
add_feature_info(${_name} ${_name} "${_description}")
endmacro()
# function to add a simple build option which controls compile definition(s) for a target.
# Synopsis:
# target_optional_compile_definitions(<target> [FEATURE]
# NAME <name> DESCRIPTION <description> DEFAULT <default_value>
# [ENABLED [enabled_compile_definitions...]]
# [DISABLED [disabled_compile_defnitions...]]
# )
# NAME, DESCRIPTION and DEFAULT are passed to option() call
# if FEATURE is given, they are passed to add_feature_info()
# ENABLED lists compile definitions that will be set on <target> when option is enabled,
# DISABLED lists definitions that will be set otherwise
function(target_optional_compile_definitions _target _scope)
set(options FEATURE)
set(oneValueArgs NAME DESCRIPTION DEFAULT)
set(multiValueArgs ENABLED DISABLED)
cmake_parse_arguments(TOCD ${options} "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
option(${TOCD_NAME} "${TOCD_DESCRIPTION}" ${TOCD_DEFAULT})
if (${${TOCD_NAME}})
target_compile_definitions(${_target} ${_scope} ${TOCD_ENABLED})
else()
target_compile_definitions(${_target} ${_scope} ${TOCD_DISABLED})
endif()
if(${TOCD_FEATURE})
add_feature_info(${TOCD_NAME} ${TOCD_NAME} "${TOCD_DESCRIPTION}")
endif()
endfunction()
# a helper macro that calls find_package() and appends the package (if found) to the
# _package_dependencies list, which can be used later to generate package config file
macro(find_public_dependency _name)
find_package(${_name} ${ARGN})
string(TOUPPER "${_name}" _name_uppercased)
if (${_name}_FOUND OR ${_name_uppercased}_FOUND)
# Dependencies to be used below for generating Config.cmake file
# We don't need the 'REQUIRED' argument there
set(_args "${_name}")
list(APPEND _args "${ARGN}")
list(REMOVE_ITEM _args "REQUIRED")
list(REMOVE_ITEM _args "") # just in case
string(REPLACE ";" " " _args "${_args}")
list(APPEND _package_dependencies "${_args}")
endif()
endmacro()
function(select_cxx_standard _target _minimal_supported_version)
message(STATUS "Compiler default is C++${CMAKE_CXX_STANDARD_DEFAULT}")
# make the CXX_STANDARD property public to ensure it makes it into the pkg-config file
get_target_property(_std ${_target} CXX_STANDARD)
# if it is unset, select the default if it is sufficient or the ${_minimal_supported_version}
if (NOT ${_std})
if (${CMAKE_CXX_STANDARD_DEFAULT} GREATER_EQUAL ${_minimal_supported_version})
set(_std ${CMAKE_CXX_STANDARD_DEFAULT})
else()
set(_std ${_minimal_supported_version})
endif()
else()
if (${_std} LESS ${_minimal_supported_version})
message(FATAL_ERROR "Sorry, C++${_std} is not supported by libtorrent")
endif()
endif()
if (cxx_std_${_std} IN_LIST CMAKE_CXX_COMPILE_FEATURES)
# force this standard
target_compile_features(${_target} PUBLIC cxx_std_${_std})
else()
message(FATAL_ERROR "Requested C++ standard version (${_std}) is not supported by the compiler")
endif()
message(STATUS "Building in C++${_std} mode")
endfunction()
# function for parsing version variables that are set in version.hpp file
# the version identifiers there are defined as follows:
# #define LIBTORRENT_VERSION_MAJOR 1
# #define LIBTORRENT_VERSION_MINOR 2
# #define LIBTORRENT_VERSION_TINY 0
function(read_version _verFile _outVarMajor _outVarMinor _outVarTiny)
file(STRINGS ${_verFile} verFileContents REGEX ".+LIBTORRENT_VERSION_[A-Z]+.[0-9]+.*")
# message(STATUS "version file contents: ${verFileContents}")
# the verFileContents variable contains something like the following:
# #define LIBTORRENT_VERSION_MAJOR 1;#define LIBTORRENT_VERSION_MINOR 2;#define LIBTORRENT_VERSION_TINY 0
set(_regex ".+_MAJOR +([0-9]+);.+_MINOR +([0-9]+);.+_TINY +([0-9]+)")
# note quotes around _regex, they are needed because the variable contains semicolons
string(REGEX MATCH "${_regex}" _tmp "${verFileContents}")
if (NOT _tmp)
message(FATAL_ERROR "Could not detect project version number from ${_verFile}")
endif()
# message(STATUS "Matched version string: ${_tmp}")
set(${_outVarMajor} ${CMAKE_MATCH_1} PARENT_SCOPE)
set(${_outVarMinor} ${CMAKE_MATCH_2} PARENT_SCOPE)
set(${_outVarTiny} ${CMAKE_MATCH_3} PARENT_SCOPE)
endfunction()