Hi Mark,

That's unfortunate. Assuming you're on macOS, do you mind running

ls ~/Library/Logs/DiagnosticReports/swift*.crash

that might reveal some compiler crash reports. If yes I think the best would be 
to file a bug for these crashes on http://bugs.swift.org . What presumably 
would be most helpful is a small reproduction of that crash but I realise that 
can be hard at times...

Thanks,
  Johannes


> On 7 Apr 2017, at 07:31, Mark Woollard via swift-dev <swift-dev@swift.org> 
> wrote:
> 
> Following upgrade to Xcode 8.3 / Swift 3.1 I have a project where the 
> compiler is crashing when Swift optimisation is enabled in release builds 
> (whole module or single file). Project builds fine for earlier compiler 
> releases. The crash gives no stack trace in console. The crash occurs for one 
> framework component within a complex project with multiple frameworks + app 
> with lots of inter-dependency so its hard to know what specifically is 
> causing the issue or produce something to reproduce and file with a bug 
> report. If I turn off optimisation for that one framework the whole project 
> builds.
> 
> I gather crashes related to optimisation have been seen by others from 
> discussions I’ve seen elsewhere ?
> What is the status of the issue, ETA for a fix ?
> Is there anything I can do to help provide info to fix the issue ? I might be 
> able to build debug version of compiler and try and use it under debugger 
> with the project for example, or is there anything else I can do to get you 
> useful info ?
> 
> Thanks
> Mark
> _______________________________________________
> swift-dev mailing list
> swift-dev@swift.org
> https://lists.swift.org/mailman/listinfo/swift-dev

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