https://ci.debian.net/packages/m/meson/testing/riscv64/76044892/

...
5180s The following packages have unmet dependencies:
5181s  satisfy:command-line : Depends: meson but it is not going to be installed
5181s                         Depends: g++ but it is not going to be installed
5181s                         Depends: g++-arm-linux-gnueabihf but it is not installable
5181s E: Unable to satisfy dependencies. Reached two conflicting assignments:
5181s    1. satisfy:command-line:riscv64=1 is selected for install
5181s    2. satisfy:command-line:riscv64 Depends g++-arm-linux-gnueabihf
5181s       but none of the choices are installable:
5181s       [no choices]
5181s crossbuild           FAIL badpkg
5181s blame: meson
5181s badpkg: Test dependencies are unsatisfiable. A common reason is that your testbed is out of date with respect to the archive, and you need to use a current testbed or run apt-get update or use -U.
5181s autopkgtest [19:35:19]: @@@@@@@@@@@@@@@@@@@@ summary
5181s basicmeson           PASS
5181s clangmeson           PASS
5181s exhaustive           PASS
5181s crossbuild           FAIL badpkg
...


The crossbuild test should have
  Architecture: amd64 arm64 armhf i386 ppc64el s390x
to match where g++-arm-linux-gnueabihf is available

This would also fix loong64.

It is not obvious why crossbuild currently has !armhf,
the test passes on armhf with the version of meson
currently in testing:
https://ci.debian.net/packages/m/meson/testing/armhf/75108264/
and it also passes for me with 1.12.1-1.

We believe that the bug you reported is fixed in the latest version of
meson, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 1149020@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Jussi Pakkanen <jussi.pakkanen@mailbox.org> (supplier of updated meson package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)
Format: 1.8
Date: Sun, 27 Sep 2026 00:30:10 +0300
Source: meson
Architecture: source
Version: 1.12.1-2
Distribution: unstable
Urgency: medium
Maintainer: Jussi Pakkanen <jussi.pakkanen@mailbox.org>
Changed-By: Jussi Pakkanen <jussi.pakkanen@mailbox.org>
Closes: 1149020
Changes:
 meson (1.12.1-2) unstable; urgency=medium
 .
   * Fix crossbuild test architecture. Closes: #1149020.
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