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build: add a CMake based build system (#38)
This will allow using Swift System in the toolchain stack, allowing us to bootstrap a toolchain.
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‎CMakeLists.txt‎

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#[[
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This source file is part of the Swift System open source project
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Copyright (c) 2020 Apple Inc. and the Swift System project authors
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Licensed under Apache License v2.0 with Runtime Library Exception
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See https://swift.org/LICENSE.txt for license information
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#]]
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cmake_minimum_required(VERSION 3.16.0)
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project(swift-system
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LANGUAGES C Swift)
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list(APPEND CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/cmake/modules)
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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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get_property(SWIFT_SYSTEM_EXPORTS GLOBAL PROPERTY SWIFT_SYSTEM_EXPORTS)
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export(TARGETS ${SWIFT_SYSTEM_EXPORTS}
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NAMESPACE SwiftSystem::
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FILE swift-system-config.cmake
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EXPORT_LINK_INTERFACE_LIBRARIES)

‎Sources/CMakeLists.txt‎

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#[[
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This source file is part of the Swift System open source project
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Copyright (c) 2020 Apple Inc. and the Swift System project authors
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Licensed under Apache License v2.0 with Runtime Library Exception
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See https://swift.org/LICENSE.txt for license information
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#]]
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add_subdirectory(CSystem)
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add_subdirectory(System)

‎Sources/CSystem/CMakeLists.txt‎

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#[[
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This source file is part of the Swift System open source project
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Copyright (c) 2020 Apple Inc. and the Swift System project authors
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Licensed under Apache License v2.0 with Runtime Library Exception
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See https://swift.org/LICENSE.txt for license information
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#]]
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add_library(CSystem INTERFACE)
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target_include_directories(CSystem INTERFACE
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include)
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set_property(GLOBAL APPEND PROPERTY SWIFT_SYSTEM_EXPORTS CSystem)

‎Sources/CSystem/include/module.modulemap‎

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module CSystem {
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header "CSystemLinux.h"
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header "CSystemWindows.h"
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export *
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}

‎Sources/System/CMakeLists.txt‎

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#[[
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This source file is part of the Swift System open source project
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Copyright (c) 2020 Apple Inc. and the Swift System project authors
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Licensed under Apache License v2.0 with Runtime Library Exception
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See https://swift.org/LICENSE.txt for license information
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#]]
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add_library(System
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Errno.swift
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FileDescriptor.swift
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FileHelpers.swift
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FileOperations.swift
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FilePermissions.swift
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PlatformString.swift
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SystemString.swift
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Util.swift
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UtilConsumers.swift)
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target_sources(System PRIVATE
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FilePath/FilePath.swift
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FilePath/FilePathComponents.swift
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FilePath/FilePathComponentView.swift
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FilePath/FilePathParsing.swift
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FilePath/FilePathString.swift
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FilePath/FilePathSyntax.swift
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FilePath/FilePathWindows.swift)
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target_sources(System PRIVATE
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Internals/CInterop.swift
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Internals/Constants.swift
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Internals/Exports.swift
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Internals/Mocking.swift
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Internals/Syscalls.swift
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Internals/WindowsSyscallAdapters.swift)
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target_link_libraries(System PRIVATE
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CSystem)
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_install_target(System)
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set_property(GLOBAL APPEND PROPERTY SWIFT_SYSTEM_EXPORTS System)

‎cmake/modules/SwiftSupport.cmake‎

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#[[
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This source file is part of the Swift System open source project
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Copyright (c) 2020 Apple Inc. and the Swift System project authors
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Licensed under Apache License v2.0 with Runtime Library Exception
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See https://swift.org/LICENSE.txt for license information
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#]]
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# Returns the architecture name in a variable
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#
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# Usage:
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# get_swift_host_arch(result_var_name)
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#
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# Sets ${result_var_name} with the converted architecture name derived from
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# CMAKE_SYSTEM_PROCESSOR.
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function(get_swift_host_arch result_var_name)
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if("${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(_install_target module)
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get_swift_host_os(swift_os)
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get_target_property(type ${module} TYPE)
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if(type STREQUAL STATIC_LIBRARY)
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set(swift swift_static)
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else()
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set(swift swift)
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endif()
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install(TARGETS ${module}
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ARCHIVE DESTINATION lib/${swift}/${swift_os}
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LIBRARY DESTINATION lib/${swift}/${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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get_swift_host_arch(swift_arch)
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get_target_property(module_name ${module} Swift_MODULE_NAME)
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if(NOT module_name)
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set(module_name ${module})
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endif()
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install(FILES $<TARGET_PROPERTY:${module},Swift_MODULE_DIRECTORY>/${module_name}.swiftdoc
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DESTINATION lib/${swift}/${swift_os}/${module_name}.swiftmodule
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RENAME ${swift_arch}.swiftdoc)
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install(FILES $<TARGET_PROPERTY:${module},Swift_MODULE_DIRECTORY>/${module_name}.swiftmodule
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DESTINATION lib/${swift}/${swift_os}/${module_name}.swiftmodule
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RENAME ${swift_arch}.swiftmodule)
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endfunction()

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