Runtimes: attempt to embed a SxS manifest for swiftCore

This will allow us to have multiple parallel installations of swiftCore
with the same DLL name allowing us to side-step the ABI instability
without resorting to SOVERSIONing.

Author: compnerd

Runtimes/Core/core/CMakeLists.txt

@@ -318,6 +318,14 @@ if(NOT POLICY CMP0157)
     $<TARGET_OBJECTS:swiftThreading>)
 endif()
 
+if(WIN32 AND BUILD_SHARED_LIBS)
+  configure_file(swiftCore.1.manifest.in
+    swiftCore-${PROJECT_VERSION}.1.manifest
+    @ONLY NEWLINE_STYLE WIN32)
+  add_custom_command(TARGET swiftCore POST_BUILD
+    COMMAND ${CMAKE_MT} -nologo -manifest "${CMAKE_CURRENT_BINARY_DIR}/swiftCore-${PROJECT_VERSION}.1.manifest" "-outputresource:$<TARGET_FILE:swiftCore>;#1")
+endif()
+
 if(NOT ANDROID AND NOT APPLE AND NOT LINUX AND NOT WIN32 AND UNIX)
   find_library(EXECINFO_LIBRARY execinfo)
   target_link_libraries(swiftCore PRIVATE "${EXECINFO_LIBRARY}")

Runtimes/Resync.cmake

@@ -71,6 +71,17 @@ if(_output)
     "Copy ${StdlibSources}/Info.plist.in] -> Core/Info.plist.in Failed: ${_output}")
 endif()
 
+message(STATUS "manifest[${StdlibSources}/swiftCore.1.manifest.in] -> Core/core/swiftCore.1.manifest.in")
+file(COPY_FILE
+  "${StdlibSources}/public/core/swiftCore.1.manifest.in"        # From
+  "${CMAKE_CURRENT_LIST_DIR}/Core/core/swiftCore.1.manifest.in" # To
+  RESULT _output
+  ONLY_IF_DIFFERENT)
+if(_output)
+  message(SEND_ERROR
+    "Copy ${StdlibSources}/public/core/swiftCore.1.manifest.in -> Core/core/swiftCore.1.manifest.in Failed; ${_output}")
+endif()
+
 set(CoreLibs
   LLVMSupport
   SwiftShims

stdlib/public/core/swiftCore.1.manifest.in

@@ -0,0 +1,9 @@
+<?xml version='1.0' encoding='utf-8' standalone='yes'?>
+<assembly manifestversion='1.0' xmlns="urn:schemas-microsoft-com:asm.v1">
+  <assemblyIdentity
+    name='swiftCore'
+    processorArchitecture='@CMAKE_SYSTEM_PROCESSOR@'
+    type='win32'
+    version='@PROJECT_VERSION@' />
+  <file name='swiftCore.dll' />
+</assembly>