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Bug#1098136: xfce4-mpc-plugin: ftbfs with GCC-15



Package: src:xfce4-mpc-plugin
Version: 0.5.3-1
Severity: important
Tags: sid forky
User: debian-gcc@lists.debian.org
Usertags: ftbfs-gcc-15

[This bug is NOT targeted to the upcoming trixie release]

Please keep this issue open in the bug tracker for the package it
was filed for.  If a fix in another package is required, please
file a bug for the other package (or clone), and add a block in this
package. Please keep the issue open until the package can be built in
a follow-up test rebuild.

The package fails to build in a test rebuild on at least amd64 with
gcc-15/g++-15, but succeeds to build with gcc-14/g++-14. The
severity of this report will be raised before the forky release.

The full build log can be found at:
http://qa-logs.debian.net/2025/02/16/amd64exp/xfce4-mpc-plugin_0.5.3-1_unstable_gccexp.log.gz
The last lines of the build log are at the end of this report.

To build with GCC 15, either set CC=gcc-15 CXX=g++-15 explicitly,
or install the gcc, g++, gfortran, ... packages from experimental.

  apt-get -t=experimental install g++ 

GCC 15 now defaults to the C23/C++23 standards, exposing many FTBFS.
Other Common build failures are new warnings resulting in build failures
with -Werror turned on, or new/dropped symbols in Debian symbols files.
For other C/C++ related build failures see the porting guide at
http://gcc.gnu.org/gcc-15/porting_to.html

[...]
In file included from /usr/include/xfce4/libxfce4ui-2/libxfce4ui/libxfce4ui.h:36,
                 from xfce4-mpc-plugin.c:25:
/usr/include/xfce4/libxfce4ui-2/libxfce4ui/xfce-titled-dialog.h:74:1: note: declared here
   74 | xfce_titled_dialog_new_with_buttons (const gchar *title,
      | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
simple-libmpd.c: In function 'send_complex_cmd':
simple-libmpd.c:314:11: error: too many arguments to function 'parse_answer_fct'; expected 0, have 2
  314 |          (*parse_answer_fct)(mo, res);
      |          ~^~~~~~~~~~~~~~~~~~ ~~
simple-libmpd.c:331:11: error: too many arguments to function 'parse_answer_fct'; expected 0, have 2
  331 |          (*parse_answer_fct)(mo, res);
      |          ~^~~~~~~~~~~~~~~~~~ ~~
simple-libmpd.c: In function 'mpd_status_update':
simple-libmpd.c:376:37: error: passing argument 3 of 'send_complex_cmd' from incompatible pointer type [-Wincompatible-pointer-types]
  376 |    send_complex_cmd(mo, "status\n", parse_status_answer, NULL);
      |                                     ^~~~~~~~~~~~~~~~~~~
      |                                     |
      |                                     void (*)(MpdObj *, void *)
simple-libmpd.c:275:53: note: expected 'void (*)(void)' but argument is of type 'void (*)(MpdObj *, void *)'
  275 | void send_complex_cmd(MpdObj* mo, char* cmd, void (*parse_answer_fct)(), void *res)
      |                                              ~~~~~~~^~~~~~~~~~~~~~~~~~~
simple-libmpd.c:343:6: note: 'parse_status_answer' declared here
  343 | void parse_status_answer(MpdObj *mo, void* unused_param)
      |      ^~~~~~~~~~~~~~~~~~~
simple-libmpd.c: In function 'mpd_playlist_get_current_song':
simple-libmpd.c:499:45: error: passing argument 3 of 'send_complex_cmd' from incompatible pointer type [-Wincompatible-pointer-types]
  499 |       send_complex_cmd(mo, "currentsong\n", parse_one_song, (void*) mo->cursong);
      |                                             ^~~~~~~~~~~~~~
      |                                             |
      |                                             void (*)(MpdObj *, void *)
simple-libmpd.c:275:53: note: expected 'void (*)(void)' but argument is of type 'void (*)(MpdObj *, void *)'
  275 | void send_complex_cmd(MpdObj* mo, char* cmd, void (*parse_answer_fct)(), void *res)
      |                                              ~~~~~~~^~~~~~~~~~~~~~~~~~~
simple-libmpd.c:381:6: note: 'parse_one_song' declared here
  381 | void parse_one_song(MpdObj *mo, void* param)
      |      ^~~~~~~~~~~~~~
simple-libmpd.c: In function 'mpd_playlist_get_changes':
simple-libmpd.c:522:43: error: passing argument 3 of 'send_complex_cmd' from incompatible pointer type [-Wincompatible-pointer-types]
  522 |    send_complex_cmd(mo, "playlistinfo\n", parse_playlistinfo_answer, (void*) md);
      |                                           ^~~~~~~~~~~~~~~~~~~~~~~~~
      |                                           |
      |                                           void (*)(MpdObj *, void *)
simple-libmpd.c:275:53: note: expected 'void (*)(void)' but argument is of type 'void (*)(MpdObj *, void *)'
  275 | void send_complex_cmd(MpdObj* mo, char* cmd, void (*parse_answer_fct)(), void *res)
      |                                              ~~~~~~~^~~~~~~~~~~~~~~~~~~
simple-libmpd.c:410:6: note: 'parse_playlistinfo_answer' declared here
  410 | void parse_playlistinfo_answer(MpdObj *mo, void *param)
      |      ^~~~~~~~~~~~~~~~~~~~~~~~~
simple-libmpd.c: In function 'mpd_server_get_output_devices':
simple-libmpd.c:578:38: error: passing argument 3 of 'send_complex_cmd' from incompatible pointer type [-Wincompatible-pointer-types]
  578 |    send_complex_cmd(mo, "outputs\n", parse_outputs_answer, (void*) md);
      |                                      ^~~~~~~~~~~~~~~~~~~~
      |                                      |
      |                                      void (*)(MpdObj *, void *)
simple-libmpd.c:275:53: note: expected 'void (*)(void)' but argument is of type 'void (*)(MpdObj *, void *)'
  275 | void send_complex_cmd(MpdObj* mo, char* cmd, void (*parse_answer_fct)(), void *res)
      |                                              ~~~~~~~^~~~~~~~~~~~~~~~~~~
simple-libmpd.c:447:6: note: 'parse_outputs_answer' declared here
  447 | void parse_outputs_answer(MpdObj *mo, void *param)
      |      ^~~~~~~~~~~~~~~~~~~~
make[3]: *** [Makefile:521: libmpc_la-simple-libmpd.lo] Error 1
make[3]: *** Waiting for unfinished jobs....
make[3]: Leaving directory '/build/reproducible-path/xfce4-mpc-plugin-0.5.3/panel-plugin'
make[2]: *** [Makefile:450: all-recursive] Error 1
make[2]: Leaving directory '/build/reproducible-path/xfce4-mpc-plugin-0.5.3'
make[1]: *** [Makefile:382: all] Error 2
make[1]: Leaving directory '/build/reproducible-path/xfce4-mpc-plugin-0.5.3'
dh_auto_build: error: make -j8 returned exit code 2
make: *** [debian/rules:7: binary] Error 25
dpkg-buildpackage: error: debian/rules binary subprocess returned exit status 2


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