indexstore-db doesn't build on Windows

[dschaefer2]

When building with SwiftPM, I get the following compile error:

C:\Users\dschaefer2\swift\src\indexstore-db\lib\Support\Logging.cpp:19:10: fatal error: 'dispatch/dispatch.h' file not found 19 | #include <dispatch/dispatch.h> | ^~~~~~~~~~~~~~~~~~~~~

This also breaks building sourcekit-lsp on Windows.

Tested with the 6.1 toolchain building source from main.

[bnbarham]

Unfortunately this is expected today :( See https://github.com/swiftlang/sourcekit-lsp/blob/main/CONTRIBUTING.md#windows

[bnbarham]

I'll leave open since ideally we would improve things here.

[dschaefer2]

Ben also mentions this is a problem on Linux as well. I need to understand what changes needs to be done to the toolset to add in these paths automatically.