Merge pull request swiftlang#22867 from compnerd/defaults-are-gud

build: set defaults for SourceKit on Windows

Author: compnerd

CMakeLists.txt

@@ -413,6 +413,15 @@ elseif("${CMAKE_SYSTEM_NAME}" STREQUAL "Linux")
     set(SWIFT_BUILD_SYNTAXPARSERLIB_default FALSE)
     set(SWIFT_BUILD_SOURCEKIT_default FALSE)
   endif()
+elseif(CMAKE_SYSTEM_NAME STREQUAL Windows)
+  if(EXISTS ${SWIFT_PATH_TO_LIBDISPATCH_SOURCE} AND
+     CMAKE_CXX_COMPILER_ID STREQUAL Clang)
+    set(SWIFT_BUILD_SYNTAXPARSERLIB_default TRUE)
+    set(SWIFT_BUILD_SOURCEKIT_default TRUE)
+  else()
+    set(SWIFT_BUILD_SYNTAXPARSERLIB_default FALSE)
+    set(SWIFT_BUILD_SOURCEKIT_default FALSE)
+  endif()
 else()
     set(SWIFT_BUILD_SYNTAXPARSERLIB_default FALSE)
     set(SWIFT_BUILD_SOURCEKIT_default FALSE)