bug#47569: ‘qt-build-system’ retains too many references via wrappers

[Efraim Flashner <efraim@flashner.co.il>]

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On Tue, Apr 06, 2021 at 03:17:52PM +0200, Ludovic Courtès wrote:
> Hi,
> 
> For the record, changing ‘qt-build-system’ would trigger a rebuild of
> less than 400 packages according to the back-of-the-envelope calculation
> below.  In that case, it’s tempting to fix on ‘master’ and include it in
> the release.
> 
> Thoughts?
> 

There are a couple of other things we want to change with the
qt-build-system and the wrappers. Another one is changing the wrappers
so they prefix (or was it suffix?) QT_QPA_PLUGIN (and I think others) so
they can run natively on wayland. I think it would be a good
improvement and worth it.

> Ludo’.
> 
> --8<---------------cut here---------------start------------->8---
> scheme@(guile-user)> ,use(gnu)
> scheme@(guile-user)> ,use(guix build-system qt)
> scheme@(guile-user)> ,use(guix)
> scheme@(guile-user)> (define qtpkgs (fold-packages (lambda (pkg lst)
> 						     (if (eq? (package-build-system pkg) qt-build-system)
> 							 (cons pkg lst)
> 							 lst))
> 						   '()))
> scheme@(guile-user)> (length qtpkgs)
> $78 = 186
> scheme@(guile-user)> ,use(guix graph)
> scheme@(guile-user)> ,run-in-store (node-edges (@ (guix scripts graph) %reverse-package-node-type) (fold-packages cons '()))
> $79 = #<procedure 7fe494f11520 at guix/graph.scm:94:17 (node)>
> scheme@(guile-user)> (node-reachable-count qtpkgs $79)
> $80 = 180
> scheme@(guile-user)> (+ 186 180)
> $81 = 366
> --8<---------------cut here---------------end--------------->8---
> 
> 
> 

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Efraim Flashner   <efraim@flashner.co.il>   אפרים פלשנר
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