Bug#1097383: meschach: ftbfs with GCC-15

[Matthias Klose]

Package: src:meschach
Version: 1.2b-18
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/meschach_1.2b-18_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

[...]
matrixio.c: In function ‘v_finput’:
matrixio.c:292:10: warning: old-style function definition [-Wold-style-definition]
  292 | VEC     *v_finput(fp,x)
      |          ^~~~~~~~
matrixio.c:299:18: error: too many arguments to function ‘ifin_vec’; expected 0, have 2
  299 |           return ifin_vec(fp,x);
      |                  ^~~~~~~~ ~~
matrixio.c:296:18: note: declared here
  296 |      VEC        *ifin_vec(),*bfin_vec();
      |                  ^~~~~~~~
matrixio.c:301:18: error: too many arguments to function ‘bfin_vec’; expected 0, have 2
  301 |           return bfin_vec(fp,x);
      |                  ^~~~~~~~ ~~
matrixio.c:296:30: note: declared here
  296 |      VEC        *ifin_vec(),*bfin_vec();
      |                              ^~~~~~~~
matrixio.c: In function ‘ifin_vec’:
matrixio.c:296:18: warning: old-style function definition [-Wold-style-definition]
  296 |      VEC        *ifin_vec(),*bfin_vec();
      |                  ^~~~~~~~
matrixio.c:308:1: error: number of arguments doesn’t match prototype
  308 | {
      | ^
matrixio.c:296:18: error: prototype declaration
  296 |      VEC        *ifin_vec(),*bfin_vec();
      |                  ^~~~~~~~
matrixio.c: In function ‘bfin_vec’:
matrixio.c:296:30: warning: old-style function definition [-Wold-style-definition]
  296 |      VEC        *ifin_vec(),*bfin_vec();
      |                              ^~~~~~~~
matrixio.c:353:1: error: number of arguments doesn’t match prototype
  353 | {
      | ^
matrixio.c:296:30: error: prototype declaration
  296 |      VEC        *ifin_vec(),*bfin_vec();
      |                              ^~~~~~~~
matrixio.c: In function ‘setformat’:
matrixio.c:385:10: warning: old-style function definition [-Wold-style-definition]
  385 | char    *setformat(f_string)
      |          ^~~~~~~~~
matrixio.c: In function ‘m_foutput’:
matrixio.c:396:9: warning: old-style function definition [-Wold-style-definition]
  396 | void    m_foutput(fp,a)
      |         ^~~~~~~~~
matrixio.c: In function ‘px_foutput’:
matrixio.c:419:9: warning: old-style function definition [-Wold-style-definition]
  419 | void    px_foutput(fp,px)
      |         ^~~~~~~~~~
matrixio.c: In function ‘v_foutput’:
matrixio.c:438:9: warning: old-style function definition [-Wold-style-definition]
  438 | void    v_foutput(fp,x)
      |         ^~~~~~~~~
matrixio.c: In function ‘m_dump’:
matrixio.c:458:9: warning: old-style function definition [-Wold-style-definition]
  458 | void    m_dump(fp,a)
      |         ^~~~~~
matrixio.c: In function ‘px_dump’:
matrixio.c:485:9: warning: old-style function definition [-Wold-style-definition]
  485 | void    px_dump(fp,px)
      |         ^~~~~~~
matrixio.c: In function ‘v_dump’:
matrixio.c:503:9: warning: old-style function definition [-Wold-style-definition]
  503 | void    v_dump(fp,x)
      |         ^~~~~~
make[2]: *** [makefile:26: matrixio.o] Error 1
make[2]: Leaving directory '/build/reproducible-path/meschach-1.2b'
make[1]: *** [debian/rules:41: override_dh_auto_build] Error 2
make[1]: Leaving directory '/build/reproducible-path/meschach-1.2b'
make: *** [debian/rules:27: binary] Error 2
dpkg-buildpackage: error: debian/rules binary subprocess returned exit status 2