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Date:      Tue, 31 Mar 2015 20:47:38 +0200
From:      Roland Smith <rsmith@xs4all.nl>
To:        David Naylor <dbn@freebsd.org>
Cc:        freebsd-python@freebsd.org
Subject:   Re: USE_PYTHON=concurrent
Message-ID:  <20150331184738.GA95383@slackbox.erewhon.home>
In-Reply-To: <3945228.UPHqZybedq@dragon.local>
References:  <3945228.UPHqZybedq@dragon.local>

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On Mon, Mar 30, 2015 at 09:14:40PM +0200, David Naylor wrote:
> Hi,
>=20
> I am investigating converting my ports to concurrent however I am not sure
> how concurrent is supposed to work:
>=20
> I looked in /usr/ports/Mk and only found a documentation reference to
> 'concurrent'.  Setting USE_PYTHON=3Dconcurrent doesn't appear to actually
> change any behaviour.
>=20
> Please could you explain this for me?

=46rom =E2=80=9C/usr/ports/Mk/Uses/python.mk=E2=80=9D:

concurrent      - Indicates that the port can be installed for
                  different python versions at the same time. The port
                  is supposed to use a unique prefix for certain
                  directories using USES=3Duniquefiles:dirs (see the
                  uniquefiles.mk Uses for details about the
                  directories), if set to yes. Binaries receive an
                  additional suffix, based on ${PYTHON_VER}.

                  The values for the uniquefiles USES are set as
                  follows:

                      UNIQUE_PREFIX=3D  ${PYTHON_PKGNAMEPREFIX}
                      UNIQUE_SUFFIX=3D  -${PYTHON_VER}

                  If the port is installed for the current default
                  python version, scripts and binaries in

                      ${PREFIX}/bin
                      ${PREFIX}/sbin
                      ${PREFIX}/libexec

                  are linked from the prefixed version to the
                  prefix-less original name, e.g.
                  bin/foo-2.7 --> bin/foo.

So it seems that any port that only installs modules in
=E2=80=9C/usr/local/lib/pythonX.Y/site-packages/=E2=80=9D could be labeled =
as concurrent as-is.

If your port wants to put things in DOCSDIR, EXAMPLESDIR, DATADIR, WWWDIR or
ETCDIR, you should add =E2=80=9CUSES=3Duniquefiles:dirs=E2=80=9D to your po=
rt's Makefile.

Also read =E2=80=9C/usr/ports/Mk/Uses/uniquefiles.mk=E2=80=9D.


Roland
--=20
R.F.Smith                                   http://rsmith.home.xs4all.nl/
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