Dear maintainer(s),

With a recent upload of gcc-defaults the autopkgtest of mpich fails in
testing when that autopkgtest is run with the binary packages of
gcc-defaults from unstable. It passes when run with only packages from
testing. In tabular form:

                        pass            fail
gcc-defaults           from testing    1.233
mpich                  from testing    5.0.1-5
all others             from testing    from testing

I copied some of the output at the bottom of this report.

Currently this regression is blocking the migration of gcc-defaults to
testing [1]. Of course, gcc-defaults shouldn't just break your
autopkgtest (or even worse, your package), but it seems to me that the
change in gcc-defaults was intended and your package needs to update to
the new situation.

If this is a real problem in your package (and not only in your
autopkgtest), the right binary package(s) from gcc-defaults should
really add a versioned Breaks on the unfixed version of (one of your)
package(s). Note: the Breaks is nice even if the issue is only in the
autopkgtest as it helps the migration software to figure out the right
versions to combine in the tests.

More information about this bug and the reason for filing it can be found on
https://wiki.debian.org/ContinuousIntegration/RegressionEmailInformation

Paul

[1] https://qa.debian.org/excuses.php?package=gcc-defaults

https://ci.debian.net/data/autopkgtest/testing/amd64/m/mpich/74064720/log.gz

112s /usr/bin/mpif90: line 395: gfortran-15: command not found
112s Error: Command not found
112s autopkgtest [00:21:37]: test hello2

We believe that the bug you reported is fixed in the latest version of
mpich, 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 1143782@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Alastair McKinstry <mckinstry@debian.org> (supplier of updated mpich 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: Fri, 07 Aug 2026 09:46:26 +0100
Source: mpich
Architecture: source
Version: 5.0.1-6
Distribution: unstable
Urgency: medium
Maintainer: Debian Science Maintainers <debian-science-maintainers@lists.alioth.debian.org>
Changed-By: Alastair McKinstry <mckinstry@debian.org>
Closes: 1134834 1143761 1143782 1143797
Changes:
 mpich (5.0.1-6) unstable; urgency=medium
 .
   * Reinclude pmix, but not for powerpc. Closes: #1134834
   * Depend on gcc-16, gfortran-16 for autopkgtests.
     Closes: #1143782, #1143797
   * Add optional symbols to libmpich12. Closes: #1143761
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Checksums-Sha256:
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We believe that the bug you reported is fixed in the latest version of
mpich, 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 1143782@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Alastair McKinstry <mckinstry@debian.org> (supplier of updated mpich 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: Thu, 10 Sep 2026 07:27:14 +0100
Source: mpich
Binary: libmpich-dev libmpich12 libmpich12-dbgsym mpich mpich-dbgsym mpich-doc
Architecture: source arm64 all
Version: 5.0.1-10
Distribution: experimental
Urgency: medium
Maintainer: Debian Science Maintainers <debian-science-maintainers@lists.alioth.debian.org>
Changed-By: Alastair McKinstry <mckinstry@debian.org>
Description:
 libmpich-dev - Development files for MPICH
 libmpich12 - Shared libraries for MPICH
 mpich      - Implementation of the MPI Message Passing Interface standard
 mpich-doc  - Documentation for MPICH
Closes: 1134834 1143782 1143797
Changes:
 mpich (5.0.1-10) experimental; urgency=medium
 .
   * Underscores not allowed in test names
   * Add libmpi_abi.so, for testing. Experimental.
   * Reinclude pmix, but not for powerpc. Closes: #1134834
   * Depend on gcc-16, gfortran-16 for autopkgtests.
     Closes: #1143782, #1143797
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