Bug#1088168: gimp 3 FTBFS on s390x

Source: gimp
Version: 3.0.0~RC1-1
Severity: serious
Tags: ftbfs experimental
X-Debbugs-Cc: [email protected]
User: [email protected]
Usertags: s390x

gimp 3.0.0~RC1 fails to build on s390x because of a timeout during the build.

Earlier this year, 2.99.18 completed the build stage successfully on
s390x (but had some issues with running the build tests later). The
gimp developers say there were 1892 commits between 2.99.18 and 3.0.0
RC1. And I haven't verified whether 2.99.18 continues to be buildable
on s390x.

I have tried these in my Ubuntu 25.04 PPA:
- moving the documentation build to arch: all since the initial
timeout appeared to happen there. That didn't make a difference (but
I've pushed that change to Salsa anyway).
- setting dh_auto_build --no-parallel

I did not get good error information since something just hangs (times
out) instead of giving a specific error.

It hung at:
[2560/2581] cc  -o app-tools/gimp-debug-tool-3.0

so I tried disabling the app-tools build and then it hung on the previous step:
[2558/2579] c++  -o app/gimp-3.0 app/gimp-3.0.p/main.c.o

I am strongly leaning towards removing gimp on s390x soon to allow
other Debian users to use gimp 3 for Debian Trixie.

Thank you,
Jeremy Bícha