Dear maintainer(s),

tuxpaint fails to build from source with glibc 2.43, currently in
experimental. From the build log:

| src/i18n.c: In function ‘set_current_language’:
| src/i18n.c:1239:37: error: assignment of read-only location ‘*(const char *)strchr(short_lang_prefix, 95)’
|  1239 |     *strchr(short_lang_prefix, '_') = '\0';
|       |                                     ^
| msgfmt -o trans/ach.mo src/po/ach.po
| msgfmt -o trans/af.mo src/po/af.po
| msgfmt -o trans/ak.mo src/po/ak.po
| make[1]: *** [Makefile:1320: obj/i18n.o] Error 1
| make[1]: *** Waiting for unfinished jobs....
| msgfmt -o trans/am.mo src/po/am.po
| msgfmt -o trans/an.mo src/po/an.po
| In file included from src/fill.c:43:
| src/rgblinear.h:82:3: warning: initializer-string for array of ‘unsigned char’ truncates NUL terminator but destination lacks ‘nonstring’ attribute (4097 chars into 4096 available) [-Wunterminated-string-initialization]
|    82 |   "\x00\x01\x02\x03\x03\x04\x05\x06\x07\x08\x08\x09\x0a\x0b\x0b\x0c\x0d\x0d"
|       |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| make[1]: Leaving directory '/build/reproducible-path/tuxpaint-0.9.35'
| dh_auto_build: error: make -j128 INSTALL="install --strip-program=true" all PREFIX=/usr DEBUG_FLAGS=-g VER_DATE=2025-08-12 returned exit code 2
| make: *** [debian/rules:39: build-arch-stamp] Error 25
| dpkg-buildpackage: error: debian/rules binary subprocess failed with exit status 2

The full build log is available here [1].

The issue is due to ISO C23 declaration of bsearch, memchr, strchr,
strpbrk, strrchr, strstr, wcschr, wcspbrk, wcsrchr, wcsstr and wmemchr,
which now returns a pointer to a const-qualified type when the input
argument is a pointer to a const-qualified type [2].

I would like to thanks Emanuele Rocca for doing the archive rebuild on
a fast arm64 server.

Regards
Aurelien

[1] https://people.debian.org/~ema/glibc-2.43-rebuilds/output-1/tuxpaint_arm64.build
[2] https://sourceware.org/git/?p=glibc.git;a=blob;f=NEWS;h=e271fb2e4d76903c77a302aaec1ca22ce31027d0;hb=f762ccf84f122d1354f103a151cba8bde797d521#l19

control: severity 1127629 serious
control: severity 1128547 serious
control: severity 1128734 serious
control: severity 1128740 serious
control: severity 1128528 serious
control: severity 1128532 serious
control: severity 1128534 serious
control: severity 1128541 serious
control: severity 1128544 serious
control: severity 1128545 serious
control: severity 1128548 serious
control: severity 1128549 serious
control: severity 1128551 serious
control: severity 1128615 serious
control: severity 1128678 serious
control: severity 1128680 serious
control: severity 1128681 serious
control: severity 1128697 serious
control: severity 1128736 serious
control: severity 1128737 serious
control: severity 1128738 serious
control: severity 1128741 serious
control: severity 1128742 serious
control: severity 1128743 serious
control: severity 1128750 serious
control: severity 1128757 serious
control: severity 1128761 serious
control: severity 1128763 serious
control: severity 1128764 serious
control: severity 1128875 serious
control: severity 1128952 serious
control: severity 1128542 serious
control: severity 1128679 serious
control: severity 1128682 serious
control: severity 1128744 serious
control: severity 1128748 serious
control: severity 1128867 serious

Hi,

With the upload of glibc 2.43 to unstable, the packages now FTBFS in
unstable, hence upgrading the severity to serious.

Note that as a quick workaround, it is possible to roll back to C/C++17
standard using -std=c17, -std=gnu17, std=c++17 or std=gnu++17. This was
the default up to GCC 14, and GCC 15 changed it to C/C23.

Regards
Aurelien

Control: tags -1 fixed-upstream

This was fixed upstream as per
https://sourceforge.net/p/tuxpaint/tuxpaint/ci/6271edececef2a3720e5a5b4e245407cf909f034/
| Make short_lang_prefix non-const
|
| - Glibc-2.43 does not allow assigning
| to const char pointer anymore, requiring to make
| short_lang_prefix non-const
| - See: https://bugs.gentoo.org/969855
so now tagging accordingly.

HTH,
Flo

Dear maintainer,

I've prepared an NMU for tuxpaint (versioned as 1:0.9.35-1.1) and
uploaded it to DELAYED/2. Please feel free to tell me if I should
cancel it.

cu
Adrian

We believe that the bug you reported is fixed in the latest version of
tuxpaint, 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 1128757@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Adrian Bunk <bunk@debian.org> (supplier of updated tuxpaint 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: Wed, 07 Oct 2026 16:08:02 +0300
Source: tuxpaint
Architecture: source
Version: 1:0.9.35-1.1
Distribution: unstable
Urgency: medium
Maintainer: Jonathan Carter <jcc@debian.org>
Changed-By: Adrian Bunk <bunk@debian.org>
Closes: 1128757
Changes:
 tuxpaint (1:0.9.35-1.1) unstable; urgency=medium
 .
   * Non-maintainer upload.
   * Backport upstream fix for FTBFS with glibc 2.43,
     thanks to Florian Ernst. (Closes: #1128757)
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