[swift-corelibs-dev] libdispatch on Linux, or C++ std::async?

Brian Gesiak modocache at gmail.com
Mon May 30 10:50:55 CDT 2016

Thanks for the quick responses!

I had tried the experimental/foundation branch as well, with no luck.
Here's the full output from a clean build I just attempted:

Prior to the build I removed my entire build directory (which included
both libdispatch-linux-x86_64 and swift-linux-x86_64) and removed all build
artifacts from my libdispatch directory (I used `git clean -fxd` -- Make
tells me there's no target `distclean`).

Looking at the build failure, it appears to be the same one that was
reported in https://bugs.swift.org/browse/SR-1242. The author of that
report indicates that
https://github.com/apple/swift-corelibs-libdispatch/pull/64 fixes the
problem. My checkout includes the commits from that pull request, but the
problem remains.

In any case, thanks for all your help! I'll keep trying. Any and all advice
would be much appreciated!

- Brian Gesiak

On Mon, May 30, 2016 at 10:22 AM, Chris Bailey <BAILEYC at uk.ibm.com> wrote:

> I'd certainly recommend picking up the experimental/foundation branch as
> Rob recommends. Its where we've been doing some additional work to get
> properly built into the Swift toolchain and to open up some internal APIs
> needed by Foundation.
> Whilst I've been building Dispatch either independently or as part of a
> full toolchain using the buildbot_linux preset (with dispatch and
> install-dispatch added), I've just checked your build line and its working
> fine for me. It might be worth cleaning out any partial build you might
> have of libdispatch in your build directory, and running 'make distclean'
> from your libdispatch source directory.
> FYI, we've got some further changes to the experimental/foundation branch
> of libdispatch with should land in the next couple of days. This fixes some
> issues with the Swift overlay, and resolves a crash that we've found in the
> underlying libkqueue implementation.
> Chris
> From:        Rob Allen via swift-corelibs-dev <
> swift-corelibs-dev at swift.org>
> To:        Brian Gesiak <modocache at gmail.com>
> Cc:        Swift Core Libs <swift-corelibs-dev at swift.org>
> Date:        30/05/2016 08:08
> Subject:        Re: [swift-corelibs-dev] libdispatch on Linux, or C++
> std::async?
> Sent by:        swift-corelibs-dev-bounces at swift.org
> ------------------------------
> Hi,
> For what it's worth, I can't get the master branch to build either, but I
> can get the experimental/foundation branch to build.
> Regards,
> Rob....
> On 30 May 2016, at 05:28, Brian Gesiak via swift-corelibs-dev <
> *swift-corelibs-dev at swift.org* <swift-corelibs-dev at swift.org>> wrote:
> Hello all!
> I'm working on *https://bugs.swift.org/browse/SR-710*
> <https://bugs.swift.org/browse/SR-710>, which involves porting SourceKit
> to Linux. SourceKit contains a handful of references to libdispatch symbols.
> I have two questions:
> 1. Could someone share a set of instructions to build
> swift-corelibs-libdispatch on Linux? I'm using Ubuntu 15.10 and have
> installed [the dependencies listed here](
> *https://lists.swift.org/pipermail/swift-corelibs-dev/Week-of-Mon-20151207/000122.html*
> <https://lists.swift.org/pipermail/swift-corelibs-dev/Week-of-Mon-20151207/000122.html>).
> I have tried using both `swift/utils/build-script --libdispatch` as well as
> the instructions in the swift-corelibs-libdispatch `INSTALL` file. Both
> fail with the [same errors](
> *https://gist.github.com/modocache/8389d5d64e39ca5a4281500f84e9ce11*
> <https://gist.github.com/modocache/8389d5d64e39ca5a4281500f84e9ce11>).
> Any tips?
> 2. I don't know much about C++, but from what I understand the C++ stdlib
> provides tools for asynchronous programming. I list SourceKit's uses of
> libdispatch in a comment on *https://bugs.swift.org/browse/SR-1639*
> <https://bugs.swift.org/browse/SR-1639>. For those familiar with both C++
> and libdispatch: do you think it's a good idea to migrate to C++, at least
> for now?
> Any advice would be appreciated. Thanks!!
> - Brian Gesiak
> --
> Development thoughts at *http://akrabat.com* <http://akrabat.com/>
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