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build: add a CMake based build for Windows
Given that swift-package-manager is not currently ready for Windows, this addition makes it possible to build for Windows.
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‎CMakeLists.txt

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cmake_minimum_required(VERSION 3.16)
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list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake/modules)
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project(swift-log
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LANGUAGES Swift)
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set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
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set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
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set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
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set(CMAKE_Swift_MODULE_DIRECTORY ${CMAKE_BINARY_DIR}/swift)
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include(SwiftSupport)
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add_subdirectory(Sources)
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export(EXPORT swift-log
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NAMESPACE SwiftLog::
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FILE swift-log-config.cmake)

‎Sources/CMakeLists.txt

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add_subdirectory(Logging)

‎Sources/Logging/CMakeLists.txt

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add_library(Logging
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Locks.swift
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Logging.swift
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LogHandler.swift)
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target_compile_options(Logging PRIVATE
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"SHELL:$<$<PLATFORM_ID:Windows>:-Xcc -D_CRT_SECURE_NO_WARNINGS>")
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set_target_properties(Logging PROPERTIES
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INTERFACE_INCLUDE_DIRECTORIES ${CMAKE_Swift_MODULE_DIRECTORY})
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swift_install(TARGETS Logging
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EXPORT swift-log)

‎cmake/modules/SwiftSupport.cmake

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include(CMakeParseArguments)
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# Returns the architecture name in a variable
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#
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# Usage:
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# swift_get_host_arch(result_var_name)
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#
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# Sets ${result_var_name} with the converted architecture name derived from
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# CMAKE_SYSTEM_PROCESSOR.
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function(swift_get_host_arch result_var_name)
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if("${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "x86_64")
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set("${result_var_name}" "x86_64" PARENT_SCOPE)
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elseif("${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "aarch64")
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set("${result_var_name}" "aarch64" PARENT_SCOPE)
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elseif("${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "ppc64")
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set("${result_var_name}" "powerpc64" PARENT_SCOPE)
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elseif("${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "ppc64le")
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set("${result_var_name}" "powerpc64le" PARENT_SCOPE)
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elseif("${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "s390x")
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set("${result_var_name}" "s390x" PARENT_SCOPE)
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elseif("${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "armv6l")
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set("${result_var_name}" "armv6" PARENT_SCOPE)
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elseif("${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "armv7l")
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set("${result_var_name}" "armv7" PARENT_SCOPE)
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elseif("${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "armv7-a")
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set("${result_var_name}" "armv7" PARENT_SCOPE)
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elseif("${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "AMD64")
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set("${result_var_name}" "x86_64" PARENT_SCOPE)
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elseif("${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "IA64")
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set("${result_var_name}" "itanium" PARENT_SCOPE)
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elseif("${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "x86")
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set("${result_var_name}" "i686" PARENT_SCOPE)
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elseif("${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "i686")
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set("${result_var_name}" "i686" PARENT_SCOPE)
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else()
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message(FATAL_ERROR "Unrecognized architecture on host system: ${CMAKE_SYSTEM_PROCESSOR}")
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endif()
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endfunction()
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# Returns the os name in a variable
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#
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# Usage:
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# get_swift_host_os(result_var_name)
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#
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#
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# Sets ${result_var_name} with the converted OS name derived from
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# CMAKE_SYSTEM_NAME.
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function(get_swift_host_os result_var_name)
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if(CMAKE_SYSTEM_NAME STREQUAL Darwin)
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set(${result_var_name} macosx PARENT_SCOPE)
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else()
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string(TOLOWER ${CMAKE_SYSTEM_NAME} cmake_system_name_lc)
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set(${result_var_name} ${cmake_system_name_lc} PARENT_SCOPE)
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endif()
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endfunction()
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function(swift_install)
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set(options)
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set(single_parameter_options EXPORT)
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set(multiple_parameter_options TARGETS)
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cmake_parse_arguments(SI
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"${options}"
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"${single_parameter_options}"
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"${multiple_parameter_options}"
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${ARGN})
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list(LENGTH ${SI_TARGETS} si_num_targets)
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if(si_num_targets GREATER 1)
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message(SEND_ERROR "swift_install only supports a single target at a time")
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endif()
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get_swift_host_os(swift_os)
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get_target_property(type ${SI_TARGETS} TYPE)
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if(type STREQUAL STATIC_LIBRARY)
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set(swift_dir swift_static)
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else()
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set(swift_dir swift)
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endif()
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install(TARGETS ${SI_TARGETS}
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EXPORT ${SI_EXPORT}
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ARCHIVE DESTINATION lib/${swift_dir}/${swift_os}
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LIBRARY DESTINATION lib/${swift_dir}/${swift_os}
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RUNTIME DESTINATION bin)
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if(type STREQUAL EXECUTABLE)
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return()
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endif()
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swift_get_host_arch(swift_arch)
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get_target_property(module_name ${SI_TARGETS} Swift_MODULE_NAME)
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if(NOT module_name)
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set(module_name ${SI_TARGETS})
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endif()
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if(CMAKE_SYSTEM_NAME STREQUAL Darwin)
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install(FILES
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$<TARGET_PROPERTY:${SI_TARGETS},Swift_MODULE_DIRECTORY>/${module_name}.swiftdoc
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DESTINATION lib/${swift_dir}/${swift_os}/${module_name}.swiftmodule
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RENAME ${swift_arch}.swiftdoc)
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install(FILES
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$<TARGET_PROPERTY:${SI_TARGETS},Swift_MODULE_DIRECTORY>/${module_name}.swiftmodule
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DESTINATION lib/${swift_dir}/${swift_os}/${module_name}.swiftmodule
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RENAME ${swift_arch}.swiftmodule)
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else()
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install(FILES
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$<TARGET_PROPERTY:${SI_TARGETS},Swift_MODULE_DIRECTORY>/${module_name}.swiftdoc
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$<TARGET_PROPERTY:${SI_TARGETS},Swift_MODULE_DIRECTORY>/${module_name}.swiftmodule
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DESTINATION lib/${swift_dir}/${swift_os}/${swift_arch})
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endif()
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endfunction()

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