Re: qt: monolithic or modular?

[Efraim Flashner]

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 long 
> 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 and 
> over time we go through the packages that use qt and switch out the 
> monolithic qt for just the parts that the program actually uses. It makes it 
> less 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.
> 
> [0] http://hydra.gnu.org/build/1114596
> [1] 
> https://download.qt.io/official_releases/qt/5.6/5.6.0/single/qt-everywhere-opensource-src-5.6.0.tar.xz
> [2] https://download.qt.io/official_releases/qt/5.6/5.6.0/submodules/
> 

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.

Also very worthy of note, qt-5.5.1 is listed at 288 MB, and qtbase-5.6.0
is all of 85 MB.

address@hidden:~$ 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/examples
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

[1] http://hydra.gnu.org/build/1202329

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