From mboxrd@z Thu Jan 1 00:00:00 1970 From: Efraim Flashner Subject: Re: qt: monolithic or modular? Date: Thu, 19 May 2016 16:17:50 +0300 Message-ID: <20160519131750.GA8287@debian-netbook> References: <20160405072220.1d828a86@debian-netbook> <20160518121757.GD13276@debian-netbook> <87a8jmw8fo.fsf@gnu.org> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="NzB8fVQJ5HfG6fxh" Return-path: Received: from eggs.gnu.org ([2001:4830:134:3::10]:37468) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1b3NqA-0006Kn-1v for guix-devel@gnu.org; Thu, 19 May 2016 09:18:15 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1b3Nq2-0001bx-Hf for guix-devel@gnu.org; Thu, 19 May 2016 09:18:12 -0400 Content-Disposition: inline In-Reply-To: <87a8jmw8fo.fsf@gnu.org> List-Id: "Development of GNU Guix and the GNU System distribution." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: guix-devel-bounces+gcggd-guix-devel=m.gmane.org@gnu.org Sender: "Guix-devel" To: Ludovic =?utf-8?Q?Court=C3=A8s?= Cc: guix-devel@gnu.org --NzB8fVQJ5HfG6fxh Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Thu, May 19, 2016 at 02:15:07PM +0200, Ludovic Court=C3=A8s wrote: > Efraim Flashner skribis: >=20 > > On Tue, Apr 05, 2016 at 07:22:20AM +0300, Efraim Flashner wrote: > >> I try very hard to not build qt on my laptop, mostly because of the lo= ng build time (7 hours on hydra [0]). Currently we download and use the big= download of qt[1] and frankly I'd rather not. Qt does also ship in smaller= bits[2], 32 if I counted correctly. I propose we package the submodules an= d over time we go through the packages that use qt and switch out the monol= ithic qt for just the parts that the program actually uses. It makes it les= s daunting to build, should make the closures smaller, and means that if a = submodule fails to build on an architecture then they only lose that module= , not all of qt. > >>=20 > >> [0] http://hydra.gnu.org/build/1114596 > >> [1] https://download.qt.io/official_releases/qt/5.6/5.6.0/single/qt-ev= erywhere-opensource-src-5.6.0.tar.xz > >> [2] https://download.qt.io/official_releases/qt/5.6/5.6.0/submodules/ > >>=20 > > > > Finally got around to building qtbase out, took me 6 hours total on my > > machine. So since hydra[1] says it takes 7:15 it's a bit shorter. I > > haven't had a chance yet to try out qmake on the other modules or to try > > to optimize the build yet. One of the things I did want to try was > > replacing python2 with python-wrapper and enabling parallel-builds. > > > > I opted for straight out copying qt-5's build rather than inheriting so > > it'll be easier to remove it if/when we're ready, and I updated the > > license based on the text shown during build-time. > > > > I've attached what I have so far if anyone else wants to take a look at > > it while I'm working on it. >=20 > Nice! I gather that some applications require more than just qtbase, so > we=E2=80=99d need to have all the different Qt components before we can f= ully > switch to this model, right? >=20 > Now, this could be done incrementally: we could start moving packages > that need nothing beyond qtbase to this new package, and so on. >=20 > Thoughts? That was my plan. Looking at nix's qt-5 it doesn't look like they even build all of the packages so hopefully it shouldn't be too long. My original hope that the base would take significantly less time didn't pan out, but this is still good. I'm now hoping that since qtbase took forever the other modules should be quick. >=20 > > Also very worthy of note, qt-5.5.1 is listed at 288 MB, and qtbase-5.6.0 > > is all of 85 MB. > > > > efraim@debian-netbook:~$ du -sch > > /gnu/store/r9bpiyz2w5bkavnx3s1ffxpgc51wa9z5-qtbase-5.6.0/* > > 6.6M /gnu/store/r9bpiyz2w5bkavnx3s1ffxpgc51wa9z5-qtbase-5.6.0/bin > > 560K /gnu/store/r9bpiyz2w5bkavnx3s1ffxpgc51wa9z5-qtbase-5.6.0/doc > > 25M /gnu/store/r9bpiyz2w5bkavnx3s1ffxpgc51wa9z5-qtbase-5.6.0/exampl= es > > 20M /gnu/store/r9bpiyz2w5bkavnx3s1ffxpgc51wa9z5-qtbase-5.6.0/include > > 30M /gnu/store/r9bpiyz2w5bkavnx3s1ffxpgc51wa9z5-qtbase-5.6.0/lib > > 2.5M /gnu/store/r9bpiyz2w5bkavnx3s1ffxpgc51wa9z5-qtbase-5.6.0/mkspecs > > 2.6M /gnu/store/r9bpiyz2w5bkavnx3s1ffxpgc51wa9z5-qtbase-5.6.0/plugins > > 85M total >=20 > It would be awesome if this would use the various configure flags that > our qt4 package is using, such that we don=E2=80=99t have weird top-level > directories such as =E2=80=99mkspecs=E2=80=99 and =E2=80=98plugins=E2=80= =99. >=20 > If would be worth trying to move doc/ and examples/ to a =E2=80=9Cdoc=E2= =80=9D output, > but as noted in a comment in qt4, moving the examples may not be > possible. >=20 > Could you give it a try? >=20 mkspecs we actually might need, it has qmake.conf files for tons of different architecture/OS options. Examples hopefully we can split out, but reading the note for qt-4 I'm not too optimistic. Docs don't look to me like they're big enough to bother with. Plugins has interface .so files for things like different sql databases and other stuff. > Thanks, > Ludo=E2=80=99. :) --=20 Efraim Flashner =D7=90=D7=A4=D7=A8=D7=99=D7=9D = =D7=A4=D7=9C=D7=A9=D7=A0=D7=A8 GPG key =3D A28B F40C 3E55 1372 662D 14F7 41AA E7DC CA3D 8351 Confidentiality cannot be guaranteed on emails sent or received unencrypted --NzB8fVQJ5HfG6fxh Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQIcBAEBCgAGBQJXPbz5AAoJEPTB05F+rO6Tgu4P/1/qwT01UjQohAwCWfIEFZUZ X9gsMhGEdJFroRi9V/X0lyYCL6lcU1M45jhOxR6FEbcHzrZuwTAAi3hAX5eNK+tg DygCehgH0LKIanjYX/fxw7msVRw8jZa3MfjzQbU45ghpFr2kgGN5nrM77iNIetTb QPUvc7irolkZG0hI8DX8/AhjWEVih6982TpghtzJp4Ak7Qmuel2G36FS8IfqoP2a nR/xxdrdxaS6TQIZrYvnztrqs13Gproxc2rmn76j/SfwXcgmvjTjxT96is+9lVhu B0x4pCLUOdBFmI6kDPB42Lb7QnOoHTToNH1YaQc3y57UQJdE7Dr73Lpd7FkEMyn1 6cktL1ddhbtlIx6SItyaIGW0D9L+Q7LxNt2HT7rkww2DzXNIYYJvDmu8eLrlspJp fGF4JWG+l0dsmGcAKXaH2KYo8Y5vx3gS1ND7GgvSH2uBtRNiY6SofWOm1gFXtsXa DW5NMT1PQAbPVTtOZDQnD7Cmz1akx5z0HJuee0xCVLm5LBu9eQhnrHdv2tc4uQTX vc6hoYhnqou1PZkb+JUC2mb69OsUDyHIAc25D3dvei/KF1SliEeIySBnWH/eNlMr wFTF52XZfwMZ8yZGsyjC1Lebb6HHmbwccKyS3Z1KEyNLLdSkQAr1ql0XhT9rzQzv i2Y8kmwxrMMwfvsTGOxV =415F -----END PGP SIGNATURE----- --NzB8fVQJ5HfG6fxh--