Development Snapshots don't work with Xcode 9 beta?

I can't use development snapshot toolchains in Xcode 9 beta.
This is the error reported from the swiftc of the toolchain:

<unknown>:0: error: unknown argument: '-index-store-path'

Is it a known issue?

/Jens

Got the answer here:

"
If you're using http://swift.org snapshots with Xcode 9, `defaults write
http://com.apple .dt.Xcode IDEIndexEnableBoltIndex NO`
This disables indexing-while-building, which isn't yet supported by the
open source toolchains.
"

···

On Thu, Jun 8, 2017 at 6:58 PM, Jens Persson <jens@bitcycle.com> wrote:

I can't use development snapshot toolchains in Xcode 9 beta.
This is the error reported from the swiftc of the toolchain:

<unknown>:0: error: unknown argument: '-index-store-path'

Is it a known issue?

/Jens