Hi Joe,
TL;DR: right now the Swift 3.0 overlay for libdispatch is not
available on Linux.
But, a variety of activities are kicking off to get it there. There
should be visible progress (and opportunities to help if you are so
inclined) over the next few weeks.
>
> While working to convert some NSThread code over to GCD on Linux I
> noticed that (to my dismay) GCD wasn't included in the Swift 3.0
> preview build, nor is it apart of the buildbot for Linux. Scouring
> through the repository and mailing lists I can see where it is
> possible to build, but there are no downstream instructions on how
> to make a line like this:
>
> let queue = DispatchQueue(label: "com.app.queue")
>
> work with the swiftc compiler on Linux.
>
> A couple of questions:
>
> * are there any timelines that the principals of GCD with Swift 3 on
> Linux can share; i.e., is the plan to have it included in time for
> the Swift 3 GA release later this year?
I certainly hope so; but cannot speak for official plans.
> * are there any follow-up instructions past getting it built on how
> to use it (or will make install DESTDIR place it in the right spots
> in the Swift 3 toolchain hierarchy?)
>
I expect when things are done, it will be similar to how building the
current Swift-2 dispatch overlay works on Linux. To build from source you
use swift/utils/build-script with --libdispatch and it takes care of all
the details (ie, it just works...).
--dave
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