Bug#1047940: libtext-bibtex-perl: Fails to build source after successful build

[Lucas Nussbaum]

Source: libtext-bibtex-perl
Version: 0.89-1
Severity: minor
Tags: trixie sid ftbfs
User: lucas at debian.org
Usertags: ftbfs-sab-20230813 ftbfs-source-after-build
User: debian-qa at lists.debian.org
Usertags: qa-doublebuild

Hi,

This package fails to build a source package after a successful build
(dpkg-buildpackage ; dpkg-buildpackage -S).

This is probably a clear violation of Debian Policy section 4.9 (clean target),
but this is filed as severity:minor for now, because a discussion on
debian-devel showed that we might want to revisit the requirement of a working
'clean' target.

More information about this class of issues, included common problems and
solutions, is available at
https://wiki.debian.org/qa.debian.org/FTBFS/SourceAfterBuild

Relevant part of the build log:
> cd /<<PKGBUILDDIR>> && runuser -u user42 -- dpkg-buildpackage --sanitize-env -us -uc -rfakeroot -S
> --------------------------------------------------------------------------------------------------------------------------------------------
> 
> dpkg-buildpackage: info: source package libtext-bibtex-perl
> dpkg-buildpackage: info: source version 0.89-1
> dpkg-buildpackage: info: source distribution unstable
> dpkg-buildpackage: info: source changed by gregor herrmann <gregoa at debian.org>
>  dpkg-source --before-build .
>  debian/rules clean
> dh clean
>    dh_auto_clean
> 	/usr/bin/perl Build realclean --allow_mb_mismatch 1
> Cleaning up build files
> Cleaning up configuration files
>    dh_clean
>  dpkg-source -b .
> dpkg-source: info: using source format '3.0 (quilt)'
> dpkg-source: info: building libtext-bibtex-perl using existing ./libtext-bibtex-perl_0.89.orig.tar.gz
> dpkg-source: info: using patch list from debian/patches/series
> dpkg-source: error: cannot represent change to btparse/src/libbtparse.so.2: binary file contents changed
> dpkg-source: error: add btparse/src/libbtparse.so.2 in debian/source/include-binaries if you want to store the modified binary in the debian tarball
> dpkg-source: warning: executable mode 0755 of 'btparse/src/libbtparse.so.2' will not be represented in diff
> dpkg-source: error: unrepresentable changes to source
> dpkg-buildpackage: error: dpkg-source -b . subprocess returned exit status 1
> 
> E: Command 'cd /<<PKGBUILDDIR>> && runuser -u user42 -- dpkg-buildpackage --sanitize-env -us -uc -rfakeroot -S' failed to run.


The full build log is available from:
http://qa-logs.debian.net/2023/08/13/libtext-bibtex-perl_0.89-1_unstable.log

If you reassign this bug to another package, please mark it as 'affects'-ing
this package. See https://www.debian.org/Bugs/server-control#affects

If you fail to reproduce this, please provide a build log and diff it with mine
so that we can identify if something relevant changed in the meantime.