CMake: Add install platform and architecture subdirs

In some configurations, libraries are installed under
`<install-prefix>/{libdir}/swift/<platform>/<arch>` and module content
is installed under `<install-prefix>/{libdir}/swift/<platform>`.

This also accounts for the fact that Swift currently looks under
`<install-prefix>/{libdir}/swift_static/**` for the static stdlib
builds.

Runtimes/Core/CMakeLists.txt

@@ -111,6 +111,10 @@ option(SwiftCore_ENABLE_INTERNAL_CHECKS "" OFF)
 defaulted_set(SwiftCore_OBJECT_FORMAT STRING "Object format: ELF COFF")
 defaulted_set(SwiftCore_THREADING_PACKAGE STRING "Threading Package: C11 Linux PThreads Win32")
 
+option(SwiftCore_INSTALL_NESTED_SUBDIR "Install libraries under a platform and architecture subdirectory" ON)
+set(SwiftCore_INSTALL_LIBDIR "${CMAKE_INSTALL_LIBDIR}/swift$<$<NOT:$<BOOL:${BUILD_SHARED_LIBS}>>:_static>$<$<BOOL:${SwiftCore_INSTALL_NESTED_SUBDIR}>:/${SwiftCore_PLATFORM_SUBDIR}/${SwiftCore_ARCH_SUBDIR}>")
+set(SwiftCore_INSTALL_SWIFTMODULEDIR "${CMAKE_INSTALL_LIBDIR}/swift$<$<NOT:$<BOOL:${BUILD_SHARED_LIBS}>>:_static>$<$<BOOL:${SwiftCore_INSTALL_NESTED_SUBDIR}>:/${SwiftCore_PLATFORM_SUBDIR}>")
+
 # TODO: Most of these should be attached to specific targets rather than applied
 #       globally. They can be applied as part of the library interface if they
 #       affect the behavior of libraries that build against a given target.

Runtimes/Core/cmake/caches/Vendors/Apple/apple-common.cmake

@@ -13,6 +13,8 @@ set(SwiftCore_ENABLE_RUNTIME_FUNCTION_COUNTERS ON CACHE BOOL "")
 set(SwiftCore_ENABLE_BACKDEPLOYMENT_SUPPORT ON CACHE BOOL "")
 set(SwiftCore_ENABLE_FILESYSTEM_SUPPORT ON CACHE BOOL "")
 
+set(SwiftCore_INSTALL_NESTED_SUBDIR OFF CACHE BOOL "")
+
 set(CMAKE_CXX_FLAGS_MINSIZEREL "-Os -g -DNDEBUG" CACHE STRING "")
 set(CMAKE_C_FLAGS_MINSIZEREL "-Os -g -DNDEBUG" CACHE STRING "")
 set(CMAKE_Swift_FLAGS_MINSIZEREL "-Osize -g" CACHE STRING "")

Runtimes/Core/cmake/modules/EmitSwiftInterface.cmake

@@ -21,10 +21,10 @@ function(install_swift_interface target)
   if(SwiftCore_ENABLE_LIBRARY_EVOLUTION)
     install(FILES "${CMAKE_CURRENT_BINARY_DIR}/$<TARGET_PROPERTY:${target},Swift_MODULE_NAME>.swiftinterface"
       RENAME "${SwiftCore_MODULE_TRIPLE}.swiftinterface"
-      DESTINATION "${CMAKE_INSTALL_LIBDIR}/swift/$<TARGET_PROPERTY:${target},Swift_MODULE_NAME>.swiftmodule")
+      DESTINATION "${SwiftCore_INSTALL_SWIFTMODULEDIR}/$<TARGET_PROPERTY:${target},Swift_MODULE_NAME>.swiftmodule")
 
     install(FILES "${CMAKE_CURRENT_BINARY_DIR}/$<TARGET_PROPERTY:${target},Swift_MODULE_NAME>.private.swiftinterface"
       RENAME "${SwiftCore_MODULE_TRIPLE}.private.swiftinterface"
-      DESTINATION "${CMAKE_INSTALL_LIBDIR}/swift/$<TARGET_PROPERTY:${target},Swift_MODULE_NAME>.swiftmodule")
+      DESTINATION "${SwiftCore_INSTALL_SWIFTMODULEDIR}/$<TARGET_PROPERTY:${target},Swift_MODULE_NAME>.swiftmodule")
   endif()
 endfunction()

Runtimes/Core/core/CMakeLists.txt

@@ -326,9 +326,12 @@ elseif(NOT APPLE AND NOT LINUX AND NOT ANDROID AND UNIX)
   target_link_libraries(swiftCore PRIVATE "${EXECINFO_LIBRARY}")
 endif()
 
-install(TARGETS swiftCore)
+install(TARGETS swiftCore
+  ARCHIVE DESTINATION "${SwiftCore_INSTALL_LIBDIR}"
+  LIBRARY DESTINATION "${SwiftCore_INSTALL_LIBDIR}"
+  RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}")
 install(FILES "${CMAKE_CURRENT_BINARY_DIR}/Swift.swiftmodule"
-  DESTINATION "${CMAKE_INSTALL_LIBDIR}/swift/Swift.swiftmodule"
+  DESTINATION "${SwiftCore_INSTALL_SWIFTMODULEDIR}/Swift.swiftmodule"
   RENAME "${SwiftCore_MODULE_TRIPLE}.swiftmodule")
 emit_swift_interface(swiftCore)
 install_swift_interface(swiftCore)

Runtimes/Core/runtime/CMakeLists.txt

@@ -149,6 +149,8 @@ if("${SwiftCore_OBJECT_FORMAT}" STREQUAL "elfx")
     "${SwiftCore_SWIFTC_SOURCE_DIR}/include"
     "${PROJECT_BINARY_DIR}/include")
   target_link_libraries(swiftrt PRIVATE swiftShims)
+  # The driver requires that swifrt.o is under `usr/lib/swift/<platform>/<arch>`
+  # Regardless of settings
   install(FILES $<TARGET_OBJECTS:swiftrt>
     DESTINATION "${CMAKE_INSTALL_LIBDIR}/swift/${SwiftCore_PLATFORM_SUBDIR}/${SwiftCore_ARCH_SUBDIR}"
     RENAME swiftrt.o)
@@ -158,6 +160,8 @@ elseif("${SwiftCore_OBJECT_FORMAT}" STREQUAL "coffx")
     $<$<NOT:$<BOOL:${BUILD_SHARED_LIBS}>>:SWIFT_STATIC_STDLIB>)
   target_link_libraries(swiftrt PRIVATE swiftShims)
   install(FILES $<TARGET_OBJECTS:swiftrt>
+    # The driver requires that swifrt.obj is under `usr/lib/swift/<platform>/<arch>`
+    # Regardless of settings
     DESTINATION "${CMAKE_INSTALL_LIBDIR}/swift/${SwiftCore_PLATFORM_SUBDIR}/${SwiftCore_ARCH_SUBDIR}"
     RENAME swiftrt.obj)
 elseif(NOT "${SwiftCore_OBJECT_FORMAT}" STREQUAL "x")