Bug#1108064: libllvm19:i386 1:19.1.7-3+b1 breaks co-installability with libllvm19:amd64; prevents Steam installation in Trixie

[daniel.gestl at it-yourself.at]

Package: libllvm19:i386
Version: 1:19.1.7-3+b1
Severity: serious
Tags: trixie multiarch

Dear Maintainers,

the recently uploaded version 1:19.1.7-3+b1 of libllvm19:i386 in Debian 
testing (Trixie) breaks multiarch co-installability with libllvm19:amd64 
(same version without +b1). This results in an unresolved dependency 
conflict for packages that rely on working i386/amd64 multiarch, notably 
steam-installer from contrib.

To reproduce:

1. On a clean Trixie system with i386 architecture added:
    sudo dpkg --add-architecture i386
    sudo apt update
    sudo apt install steam-installer

2. Result:
    APT fails to resolve dependencies due to conflict in libllvm19:i386.
    The error includes:
    mesa-libgallium:i386 depends on libllvm19:i386 (>= 1:19.1.0) but it 
is not installable

3. Cause:
    libllvm19:amd64 is at version 1:19.1.7-3
    libllvm19:i386 is at version 1:19.1.7-3+b1
    → APT resolver considers these incompatible.

This breaks the expected co-installation required for a working 
multiarch environment and makes packages like steam-installer 
uninstallable, even though they worked just days before (when 
libllvm19:i386 was still at 1:19.1.7-3 without +b1).

Please ensure consistent versioning or rebuild the relevant packages to 
restore compatibility.

Thank you for your work on Debian!

Best regards,
Daniel Gestl