Hi, I've been trying to use the swift4 snapshot toolchains with Xcode9 beta with little success.
When building I get the error: " <unknown>:0: error: unknown argument: '-index-store-path' Command /Library/Developer/Toolchains/swift-4.0-DEVELOPMENT-SNAPSHOT-2017-06-29-a.xctoolchain/usr/bin/swiftc failed with exit code 1 " I believe that this because of missing "indexing while building" support in the open source swift in the currently available snapshots. (The feature was merged just a few days ago: https://github.com/apple/swift/pull/10726) Is there a way to disable "indexing while building" in Xcode9? Thanks, Anders
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