[Jack-Devel] Major update of jack2 build system

Tim Mayberry mojofunk at gmail.com
Sun Apr 12 04:11:14 CEST 2015

On Sun, Apr 12, 2015 at 10:26 AM, Markus Seeber <
markus.seeber at spectralbird.de> wrote:

> On 04/11/2015 07:05 PM, Karl Lindén wrote:
> > Hi jack-devel list!
> >
> > [This part is technical and can be skipped, if you like]
> > To ease packaging jack2, its build system has received a major update
> [1]. The initial intent was to simply remove automagic dependencies (on
> celt, opus, libsamplerate, libsndfile, readline), which are bad [2] for
> source based distributions, such as Gentoo, but after a discussion [3] the
> decision was taken to reimplement all options that have third-party
> dependencies using a special option class, so that the build system by
> default builds against foo if available, refrains from doing so if --foo=no
> is given and if --foo=yes the dependency is hard-required. To preserve
> backwards compatibility (and save time writing "=yes") --foo is the same as
> --foo=yes.
> >
> > Apart from this change pkg-config is now used whenever possible instead
> of only header checks. (It is bad to just check for headers without
> checking for the accompanying library.) This eases packaging (and
> cross-compiling) somewhat. Also the check for readline has been improved
> (it now checks for header existence too instead of just library existence),
> in effect making it easier to compile jack2 on binary distros (where the
> library existence does not imply header existence). (Correct me if I'm
> wrong; I have not compiled jack2 on a binary distro.)
> > [End of skip part]
> >
> > So apart from the above points, what are the goodies for actual users?
> Well, now users do not have to explicitly state --alsa, --firewire or such
> to get the correct backend built since it will be automatically detected if
> --alsa, --firewire, etc. is not given.
> >
> > Now the important part. Like with all big software changes, this might
> introduce some bugs that I have not found during testing. (I did test the
> option I could with both --foo=yes and --foo=no!) Some option have not been
> tested at all since I lack the prerequisites, these options are --iio,
> --portaudio and --winmme, but since all option use the same class the logic
> should be the same, so they should work, but you can never be too sure.
> >
> > In conclusion, I want you to be on the lookout for bugs or weird stuff
> (as always!) when building jack2. Report the bugs and I will do my very
> best to squash them!
> >
> > Regards,
> > Karl Lindén (lilrc)
> >
> > [1] https://github.com/jackaudio/jack2/pull/113
> > [2]
> https://wiki.gentoo.org/wiki/Project:Quality_Assurance/Automagic_dependencies
> > [3] https://github.com/jackaudio/jack2/pull/110
> > _______________________________________________
> > Jack-Devel mailing list
> > Jack-Devel at lists.jackaudio.org
> > http://lists.jackaudio.org/listinfo.cgi/jack-devel-jackaudio.org
> >
> Is the windows specific stuff actually needed to be tested? Waf builds
> on windows doesn't seem to work (for me) anyway. I think I remember
> widows builds are only done with a Code::Blocks IDE project? Or does
> anyone cross compile for windows?

I added the windows based waf build a few years ago for cross compiling
jack2 on Fedora. It is not the build system used for the official windows

I now also use it for compiling on windows using MSYS2/mingw-w64 build


So I haven't tested it with any other configuration or with these recent
changes, so if there is a call to remove it from the waf build I am fine
with that.

In saying that I think that MSYS2 is a pretty good environment for building
software on windows so if there is any interest to support a MSYS2 build I
can submit patches to fix it up.

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