This is useful because the embedded platforms may have the same toolchain version but they contain
different stdlibs. We need to make sure the XPC service name is unique between them, otherwise we may load
and use the incorrect toolchain service.
rdar://39077520
Avoid overwriting the `swiftCore` target in the SourceKit build.
Instead, link to the explicit variant of the swiftCore. This tracks the
dependency better and enables multiple parallel cross-compilations of
the stdlib.
Implicitly link against swiftCore when linking against libdispatch.
Remove the extraneous link against the Blocks runtime on Linux. The
`add_sourcekit_executable` call already handles this. Ensure that we
enable the swift SDK overlay for libdispatch by sending it the path to
the swift compiler.
This is a NFC change that makes it easier to read SourceKit's main
CMakeLists.txt file since you only see "actions" rather than also this huge list
of helper routines.
