update cmake setup so that the library can be used by SwiftPM cmake build (#73)

Update cmake setup so that the library can be used by SwiftPM cmake build

Motivation: integrate with SwiftPM

changes:
* rename the top level project to SwiftSystem instead of swift-system to align with other projects
* rename System to SystemPackage to align with SwifPM setup
* update architectures to include arm64
* Update cmake/modules/SwiftSystemConfig.cmake.in
* Update cmake/modules/SwiftSupport.cmake

Author: tomerd

CMakeLists.txt

@@ -8,7 +8,7 @@ See https://swift.org/LICENSE.txt for license information
 #]]
 
 cmake_minimum_required(VERSION 3.16.0)
-project(swift-system
+project(SwiftSystem
   LANGUAGES C Swift)
 
 list(APPEND CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/cmake/modules)
@@ -21,9 +21,4 @@ set(CMAKE_Swift_MODULE_DIRECTORY ${CMAKE_BINARY_DIR}/swift)
 include(SwiftSupport)
 
 add_subdirectory(Sources)
-
-get_property(SWIFT_SYSTEM_EXPORTS GLOBAL PROPERTY SWIFT_SYSTEM_EXPORTS)
-export(TARGETS ${SWIFT_SYSTEM_EXPORTS}
-  NAMESPACE SwiftSystem::
-  FILE swift-system-config.cmake
-  EXPORT_LINK_INTERFACE_LIBRARIES)
+add_subdirectory(cmake/modules)

Sources/System/CMakeLists.txt

@@ -7,7 +7,7 @@ Licensed under Apache License v2.0 with Runtime Library Exception
 See https://swift.org/LICENSE.txt for license information
 #]]
 
-add_library(System
+add_library(SystemPackage
   Errno.swift
   FileDescriptor.swift
   FileHelpers.swift
@@ -17,24 +17,26 @@ add_library(System
   SystemString.swift
   Util.swift
   UtilConsumers.swift)
-target_sources(System PRIVATE
+set_target_properties(SystemPackage PROPERTIES
+  INTERFACE_INCLUDE_DIRECTORIES ${CMAKE_Swift_MODULE_DIRECTORY})
+target_sources(SystemPackage PRIVATE
   FilePath/FilePath.swift
   FilePath/FilePathComponents.swift
   FilePath/FilePathComponentView.swift
   FilePath/FilePathParsing.swift
   FilePath/FilePathString.swift
   FilePath/FilePathSyntax.swift
   FilePath/FilePathWindows.swift)
-target_sources(System PRIVATE
+target_sources(SystemPackage PRIVATE
   Internals/CInterop.swift
   Internals/Constants.swift
   Internals/Exports.swift
   Internals/Mocking.swift
   Internals/Syscalls.swift
   Internals/WindowsSyscallAdapters.swift)
-target_link_libraries(System PRIVATE
+target_link_libraries(SystemPackage PRIVATE
   CSystem)
 
 
-_install_target(System)
-set_property(GLOBAL APPEND PROPERTY SWIFT_SYSTEM_EXPORTS System)
+_install_target(SystemPackage)
+set_property(GLOBAL APPEND PROPERTY SWIFT_SYSTEM_EXPORTS SystemPackage)

cmake/modules/CMakeLists.txt

@@ -0,0 +1,19 @@
+#[[
+This source file is part of the Swift System open source Project
+
+Copyright (c) 2021 Apple Inc. and the Swift System project authors
+Licensed under Apache License v2.0 with Runtime Library Exception
+
+See https://swift.org/LICENSE.txt for license information
+#]]
+
+set(SWIFT_SYSTEM_EXPORTS_FILE ${CMAKE_CURRENT_BINARY_DIR}/SwiftSystemExports.cmake)
+
+configure_file(SwiftSystemConfig.cmake.in
+  ${CMAKE_CURRENT_BINARY_DIR}/SwiftSystemConfig.cmake)
+
+get_property(SWIFT_SYSTEM_EXPORTS GLOBAL PROPERTY SWIFT_SYSTEM_EXPORTS)
+export(TARGETS ${SWIFT_SYSTEM_EXPORTS}
+  NAMESPACE SwiftSystem::
+  FILE ${SWIFT_SYSTEM_EXPORTS_FILE}
+  EXPORT_LINK_INTERFACE_LIBRARIES)

cmake/modules/SwiftSupport.cmake

@@ -17,8 +17,12 @@ See https://swift.org/LICENSE.txt for license information
 function(get_swift_host_arch result_var_name)
   if("${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "x86_64")
     set("${result_var_name}" "x86_64" PARENT_SCOPE)
-  elseif("${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "aarch64")
-    set("${result_var_name}" "aarch64" PARENT_SCOPE)
+  elseif ("${CMAKE_SYSTEM_PROCESSOR}" MATCHES "AArch64|aarch64|arm64")
+    if(CMAKE_SYSTEM_NAME MATCHES Darwin)
+      set("${result_var_name}" "arm64" PARENT_SCOPE)
+    else()
+      set("${result_var_name}" "aarch64" PARENT_SCOPE)
+    endif()
   elseif("${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "ppc64")
     set("${result_var_name}" "powerpc64" PARENT_SCOPE)
   elseif("${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "ppc64le")
@@ -31,6 +35,8 @@ function(get_swift_host_arch result_var_name)
     set("${result_var_name}" "armv7" PARENT_SCOPE)
   elseif("${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "armv7-a")
     set("${result_var_name}" "armv7" PARENT_SCOPE)
+  elseif("${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "amd64")
+    set("${result_var_name}" "amd64" PARENT_SCOPE)
   elseif("${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "AMD64")
     set("${result_var_name}" "x86_64" PARENT_SCOPE)
   elseif("${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "IA64")

cmake/modules/SwiftSystemConfig.cmake.in

@@ -0,0 +1,12 @@
+#[[
+This source file is part of the Swift System open source Project
+
+Copyright (c) 2021 Apple Inc. and the Swift System project authors
+Licensed under Apache License v2.0 with Runtime Library Exception
+
+See https://swift.org/LICENSE.txt for license information
+#]]
+
+if(NOT TARGET SystemPackage)
+  include(@SWIFT_SYSTEM_EXPORTS_FILE@)
+endif()