Non-Darwin SDKs product results in per-arch directories.

Depends on swiftlang/swift#19432

Unix (other than Darwin) and Windows do not support fat binaries.
However, the build system was placing the build results in the
platform/OS folder, instead of the per-architecture folder. Having two
architectures side by side was impossible.

After applying the above patch in the Swift compiler, non-Darwin
platforms will look into the per-architecture folders, so the sibling
projects need to leave the products in the right place.

Author: drodriguez

CMakeLists.txt

@@ -73,6 +73,7 @@ if(ENABLE_SWIFT)
                            ${SWIFT_RUNTIME_LIBDIR}/${CMAKE_SHARED_LIBRARY_PREFIX}swiftSwiftOnoneSupport${CMAKE_SHARED_LIBRARY_SUFFIX})
 
   set(INSTALL_TARGET_DIR "${INSTALL_LIBDIR}/swift/${SWIFT_OS}" CACHE PATH "Path where the libraries will be installed")
+  set(INSTALL_RSRC_DIR "${INSTALL_LIBDIR}/swift/${SWIFT_OS}/${SWIFT_HOST_ARCH}" CACHE PATH "Path where the compiler resources will be installed")
   set(INSTALL_DISPATCH_HEADERS_DIR "${INSTALL_LIBDIR}/swift/dispatch" CACHE PATH "Path where the headers will be installed for libdispatch")
   set(INSTALL_BLOCK_HEADERS_DIR "${INSTALL_LIBDIR}/swift/Block" CACHE PATH "Path where the headers will be installed for the blocks runtime")
   set(INSTALL_OS_HEADERS_DIR "${INSTALL_LIBDIR}/swift/os" CACHE PATH "Path where the os/ headers will be installed")
@@ -179,6 +180,14 @@ if(NOT CMAKE_SYSTEM_NAME STREQUAL Darwin)
             BlocksRuntime
           DESTINATION
             ${INSTALL_TARGET_DIR})
+  if(NOT CMAKE_SYSTEM_NAME STREQUAL Darwin)
+    # Install also in the architecture subdir for platforms that do not support
+    # fat libraries
+    install(TARGETS
+              BlocksRuntime
+            DESTINATION
+              "${INSTALL_TARGET_DIR}/${SWIFT_HOST_ARCH}")
+  endif()
 endif()
 
 check_symbol_exists(__GNU_LIBRARY__ "features.h" _GNU_SOURCE)

src/CMakeLists.txt

@@ -231,11 +231,18 @@ install(TARGETS
           dispatch
         DESTINATION
           "${INSTALL_TARGET_DIR}")
+if(NOT CMAKE_SYSTEM_NAME STREQUAL Darwin)
+  # Install also in the architecture subdir for platforms that do not support
+  # fat libraries
+  install(TARGETS
+            dispatch
+          DESTINATION
+            "${INSTALL_TARGET_DIR}/${SWIFT_HOST_ARCH}")
+endif()
 if(ENABLE_SWIFT)
   install(FILES
             ${CMAKE_CURRENT_BINARY_DIR}/swift/Dispatch.swiftmodule
             ${CMAKE_CURRENT_BINARY_DIR}/swift/Dispatch.swiftdoc
           DESTINATION
-            "${INSTALL_TARGET_DIR}/${SWIFT_HOST_ARCH}")
+            "${INSTALL_RSRC_DIR}")
 endif()
-