bug#39758: [PATCH] Add qtbase-patched. (Fix QTBUG-81715)

[Marius Bakke <mbakke@fastmail.com>]

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John Soo <jsoo1@asu.edu> writes:

> Hi Guix,
>
> There is a known issue in qtbase 5.12.7 where the cmake macros shipped
> with qt do not work when paths include dots.  This broke freecad and
> maybe others.

Thanks!  I've pushed the patches with a few modifications in
e2546bb472b6285a8856cacf686c5e0ce9bb62c5 and
3c60d85f313f910282ed884eead80061faf6ee78.

I will move the patch to the regular qtbase package on the 'staging'
branch later to avoid the custom variant.

> I am not sure how to figure out other broken packages, if they need to
> use the patched-qtbase.

Typically you'd have to do 'guix refresh -l qtbase' and copy-paste the
package list to a 'guix build' invokation.  IWBN to have a single
command for that.

[...]
  
> From 92ba3b59a2ff1dd6b4078c649a468fa208b47a59 Mon Sep 17 00:00:00 2001
> From: John Soo <jsoo1@asu.edu>
> Date: Fri, 21 Feb 2020 21:14:57 -0800
> Subject: [PATCH 3/4] gnu: freecad. Fix build failures.
>
> * gnu/packages/engineering.scm (freecad): [supported-systems] Only support aarch64 and
> x86_64-linux, [inputs] use qtbase-patched instead of qtbase.

I dropped the [supported-systems] change as it seems unrelated to the
qtbase problem.  Could you submit it as a separate patch, ideally with a
comment that explains why we do it (i.e. "upstream only supports
64-bit platforms")?

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