[Debian-med-packaging] Bug#1096666: g2: ftbfs with GCC-15

[Matthias Klose]

Package: src:g2
Version: 0.72-12
Severity: important
Tags: sid forky
User: debian-gcc at 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/g2_0.72-12_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

[...]
src/g2_graphic_pd.c:515:13: error: too many arguments to function ‘(pd->ff + 416)->fun’; expected 0, have 5
  515 |             pd->ff[g2_FilledCircle].fun(pd->pid, pd->pdp,
      |             ^~                          ~~~~~~~
src/g2_physical_device.h:33:17: note: declared here
   33 |     int       (*fun)();               /* pointer to function */
      |                 ^~~
src/g2_graphic_pd.c:521:13: error: too many arguments to function ‘(pd->ff + 416)->fun’; expected 0, have 5
  521 |             pd->ff[g2_FilledCircle].fun(pd->pid, pd->pdp,
      |             ^~                          ~~~~~~~
src/g2_physical_device.h:33:17: note: declared here
   33 |     int       (*fun)();               /* pointer to function */
      |                 ^~~
src/g2_graphic_pd.c: In function ‘g2_arc_pd’:
src/g2_graphic_pd.c:548:13: error: too many arguments to function ‘(pd->ff + 336)->fun’; expected 0, have 8
  548 |             pd->ff[g2_Arc].fun(pd->pid, pd->pdp,
      |             ^~                 ~~~~~~~
src/g2_physical_device.h:33:17: note: declared here
   33 |     int       (*fun)();               /* pointer to function */
      |                 ^~~
src/g2_graphic_pd.c:554:13: error: too many arguments to function ‘(pd->ff + 336)->fun’; expected 0, have 8
  554 |             pd->ff[g2_Arc].fun(pd->pid, pd->pdp,
      |             ^~                 ~~~~~~~
src/g2_physical_device.h:33:17: note: declared here
   33 |     int       (*fun)();               /* pointer to function */
      |                 ^~~
src/g2_graphic_pd.c: In function ‘g2_filled_arc_pd’:
src/g2_graphic_pd.c:594:13: error: too many arguments to function ‘(pd->ff + 352)->fun’; expected 0, have 8
  594 |             pd->ff[g2_FilledArc].fun(pd->pid, pd->pdp,
      |             ^~                       ~~~~~~~
src/g2_physical_device.h:33:17: note: declared here
   33 |     int       (*fun)();               /* pointer to function */
      |                 ^~~
src/g2_graphic_pd.c:600:13: error: too many arguments to function ‘(pd->ff + 352)->fun’; expected 0, have 8
  600 |             pd->ff[g2_FilledArc].fun(pd->pid, pd->pdp,
      |             ^~                       ~~~~~~~
src/g2_physical_device.h:33:17: note: declared here
   33 |     int       (*fun)();               /* pointer to function */
      |                 ^~~
src/g2_graphic_pd.c: In function ‘g2_string_pd’:
src/g2_graphic_pd.c:641:13: error: too many arguments to function ‘(pd->ff + 432)->fun’; expected 0, have 5
  641 |             pd->ff[g2_String].fun(pd->pid, pd->pdp,
      |             ^~                    ~~~~~~~
src/g2_physical_device.h:33:17: note: declared here
   33 |     int       (*fun)();               /* pointer to function */
      |                 ^~~
src/g2_graphic_pd.c:646:13: error: too many arguments to function ‘(pd->ff + 432)->fun’; expected 0, have 5
  646 |             pd->ff[g2_String].fun(pd->pid, pd->pdp,
      |             ^~                    ~~~~~~~
src/g2_physical_device.h:33:17: note: declared here
   33 |     int       (*fun)();               /* pointer to function */
      |                 ^~~
src/g2_graphic_pd.c: In function ‘g2_image_pd’:
src/g2_graphic_pd.c:667:13: error: too many arguments to function ‘(pd->ff + 448)->fun’; expected 0, have 7
  667 |             pd->ff[g2_Image].fun(pd->pid, pd->pdp,
      |             ^~                   ~~~~~~~
src/g2_physical_device.h:33:17: note: declared here
   33 |     int       (*fun)();               /* pointer to function */
      |                 ^~~
src/g2_graphic_pd.c:672:13: error: too many arguments to function ‘(pd->ff + 448)->fun’; expected 0, have 7
  672 |             pd->ff[g2_Image].fun(pd->pid, pd->pdp,
      |             ^~                   ~~~~~~~
src/g2_physical_device.h:33:17: note: declared here
   33 |     int       (*fun)();               /* pointer to function */
      |                 ^~~
make[2]: *** [Makefile:82: src/g2_graphic_pd.o] Error 1
make[2]: Leaving directory '/build/reproducible-path/g2-0.72'
make[1]: *** [debian/rules:42: override_dh_auto_build] Error 2
make[1]: Leaving directory '/build/reproducible-path/g2-0.72'
make: *** [debian/rules:15: binary] Error 2
dpkg-buildpackage: error: debian/rules binary subprocess returned exit status 2