Dear maintainer(s),

alsa-scarlett-gui fails to build from source with glibc 2.43, currently
in experimental. From the build log:

| cc -MT error.o -MMD -MP -MF .deps/error.d -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/alsa-scarlett-gui-0.5.1=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -mbranch-protection=standard -Wall -Werror -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=3 -DVERSION=\"0.5.1-1\" -Wno-error=deprecated-declarations -I/usr/include/glib-2.0 -I/usr/lib/aarch64-linux-gnu/glib-2.0/include -I/usr/include/sysprof-6 -pthread -I/usr/include/gtk-4.0 -I/usr/include/pango-1.0 -I/usr/include/fribidi -I/usr/include/harfbuzz -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/glycin-2 -I/usr/include/cairo -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/pixman-1 -I/usr/include/graphene-1.0 -I/usr/lib/aarch64-linux-gnu/graphene-1.0/include -I/usr/include/glib-2.0 -I/usr/lib/aarch64-linux-gnu/glib-2.0/include -I/usr/include/libmount -I/usr/include/blkid -I/usr/include/sysprof-6 -pthread  -c -o error.o error.c
| alsa-sim.c: In function ‘sim_card_name’:
| alsa-sim.c:468:16: error: initialization discards ‘const’ qualifier from pointer target type [-Werror=discarded-qualifiers]
|   468 |   char *name = strrchr(fn, '/');
|       |                ^~~~~~~
| cc -MT fcp-shared.o -MMD -MP -MF .deps/fcp-shared.d -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/alsa-scarlett-gui-0.5.1=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -mbranch-protection=standard -Wall -Werror -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=3 -DVERSION=\"0.5.1-1\" -Wno-error=deprecated-declarations -I/usr/include/glib-2.0 -I/usr/lib/aarch64-linux-gnu/glib-2.0/include -I/usr/include/sysprof-6 -pthread -I/usr/include/gtk-4.0 -I/usr/include/pango-1.0 -I/usr/include/fribidi -I/usr/include/harfbuzz -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/glycin-2 -I/usr/include/cairo -I/usr/include/freetype2 -I/usr/include/libpng16 -I/usr/include/pixman-1 -I/usr/include/graphene-1.0 -I/usr/lib/aarch64-linux-gnu/graphene-1.0/include -I/usr/include/glib-2.0 -I/usr/lib/aarch64-linux-gnu/glib-2.0/include -I/usr/include/libmount -I/usr/include/blkid -I/usr/include/sysprof-6 -pthread  -c -o fcp-shared.o fcp-shared.c
| cc1: all warnings being treated as errors
| make[2]: *** [Makefile:43: alsa-sim.o] Error 1
| make[2]: *** Waiting for unfinished jobs....
| error.c: In function ‘show_error’:
| error.c:12:3: warning: ‘gtk_message_dialog_new’ is deprecated [-Wdeprecated-declarations]
|    12 |   GtkWidget *dialog = gtk_message_dialog_new(
|       |   ^~~~~~~~~
| In file included from /usr/include/gtk-4.0/gtk/gtk.h:194,
|                  from error.h:6,
|                  from error.c:4:
| /usr/include/gtk-4.0/gtk/deprecated/gtkmessagedialog.h:81:12: note: declared here
|    81 | GtkWidget* gtk_message_dialog_new      (GtkWindow      *parent,
|       |            ^~~~~~~~~~~~~~~~~~~~~~
| rm alsa-scarlett-gui-resources.c
| make[2]: Leaving directory '/build/reproducible-path/alsa-scarlett-gui-0.5.1/src'
| dh_auto_build: error: cd src && make -j128 INSTALL="install --strip-program=true" VERSION=0.5.1-1 returned exit code 2
| make[1]: *** [debian/rules:15: override_dh_auto_build] Error 25
| make[1]: Leaving directory '/build/reproducible-path/alsa-scarlett-gui-0.5.1'
| make: *** [debian/rules:12: binary] Error 2
| 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 arcbhive rebuild on
a fast arm64 server.

Regards
Aurelien

[1] https://people.debian.org/~ema/glibc-2.43-rebuilds/output-1/alsa-scarlett-gui_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

We believe that the bug you reported is fixed in the latest version of
alsa-scarlett-gui, 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 1128528@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Dale Richards <dale@dalerichards.net> (supplier of updated alsa-scarlett-gui 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, 04 Sep 2026 11:29:13 +0100
Source: alsa-scarlett-gui
Built-For-Profiles: derivative.ubuntu noudeb
Architecture: source
Version: 1.0~beta9-2
Distribution: unstable
Urgency: medium
Maintainer: Dale Richards <dale@dalerichards.net>
Changed-By: Dale Richards <dale@dalerichards.net>
Closes: 1128528
Changes:
 alsa-scarlett-gui (1.0~beta9-2) unstable; urgency=medium
 .
   * Fix FTBFS with glibc 2.43 / ISO C23 const-qualified string function
     return types (Closes: #1128528):
     - The reported failure (src/alsa-sim.c, strrchr() result assigned to a
       non-const pointer) was already fixed upstream in the 1.0~beta9
       release.
     - Add patch 0004 to make the upstream -Werror optional, and build with
       WERROR= so that a new diagnostic from a future toolchain or library
       cannot turn into another FTBFS.
   * d/copyright:
     - Add missing licensing stanza for src/scarlett2.h, a kernel UAPI
       header under GPL-2 with the Linux-syscall-note exception.
     - Correct the src/gtkdial.* license short name to LGPL-3+ (the files
       are LGPL-3-or-later).
   * Add d/upstream/metadata (DEP-12).
   * d/patches: Add DEP-3 metadata to the existing patches.
   * d/watch: Migrate to version 5.
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