ios - Swift: conditional compilation flags must be valid Swift identifiers -


today downloaded xcode 9.0 beta 4 , after building project next warning messages 

<unknown>:0: error: conditional compilation flags must valid swift identifiers (rather '-xfrontend') <unknown>:0: error: conditional compilation flags must valid swift identifiers (rather '-debug-time-function-bodies') command /applications/xcode-beta.app/contents/developer/toolchains/xcodedefault.xctoolchain/usr/bin/swiftc failed exit code 1

i have tried several options have searched here cannot find solution this.

  • cleaned project
  • cleaned build folder
  • restarted xcode
  • restarted laptop

anyone on this?

at point, or coworker included flags see how long xcode takes swift files compile. can remove them don't affect compilation. not sure if still supported if are, active compilation conditions don't take format of starting dash anymore seems.


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