[Debian-med-packaging] Bug#1096554: dwgsim: ftbfs with GCC-15

[Matthias Klose]

Package: src:dwgsim
Version: 0.1.14-3
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/dwgsim_0.1.14-3_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

[...]
 1305 | typedef struct gzFile_s *gzFile;    /* semi-opaque gzip file descriptor */
      |                          ^~~~~~
src/dwgsim.c: In function ‘main’:
src/dwgsim.c:1088:25: warning: assignment to ‘struct gzFile_s **’ from incompatible pointer type ‘gzFile’ {aka ‘struct gzFile_s *’} [-Wincompatible-pointer-types]
 1088 |           opt->fp_bfast = gzopen(fn_tmp, "w");
      |                         ^
/usr/include/zlib.h:1305:26: note: ‘gzFile’ declared here
 1305 | typedef struct gzFile_s *gzFile;    /* semi-opaque gzip file descriptor */
      |                          ^~~~~~
src/dwgsim.c:1092:24: warning: assignment to ‘struct gzFile_s **’ from incompatible pointer type ‘gzFile’ {aka ‘struct gzFile_s *’} [-Wincompatible-pointer-types]
 1092 |           opt->fp_bwa1 = gzopen(fn_tmp, "w");
      |                        ^
/usr/include/zlib.h:1305:26: note: ‘gzFile’ declared here
 1305 | typedef struct gzFile_s *gzFile;    /* semi-opaque gzip file descriptor */
      |                          ^~~~~~
src/dwgsim.c:1094:24: warning: assignment to ‘struct gzFile_s **’ from incompatible pointer type ‘gzFile’ {aka ‘struct gzFile_s *’} [-Wincompatible-pointer-types]
 1094 |           opt->fp_bwa2 = gzopen(fn_tmp, "w");
      |                        ^
/usr/include/zlib.h:1305:26: note: ‘gzFile’ declared here
 1305 | typedef struct gzFile_s *gzFile;    /* semi-opaque gzip file descriptor */
      |                          ^~~~~~
src/dwgsim.c:1104:22: warning: passing argument 1 of ‘gzclose’ from incompatible pointer type [-Wincompatible-pointer-types]
 1104 |           gzclose(opt->fp_bfast);
      |                   ~~~^~~~~~~~~~
      |                      |
      |                      struct gzFile_s **
/usr/include/zlib.h:1634:39: note: expected ‘gzFile’ {aka ‘struct gzFile_s *’} but argument is of type ‘struct gzFile_s **’
 1634 | ZEXTERN int ZEXPORT    gzclose(gzFile file);
      |                                ~~~~~~~^~~~
/usr/include/zlib.h:1305:26: note: ‘gzFile’ declared here
 1305 | typedef struct gzFile_s *gzFile;    /* semi-opaque gzip file descriptor */
      |                          ^~~~~~
src/dwgsim.c:1107:22: warning: passing argument 1 of ‘gzclose’ from incompatible pointer type [-Wincompatible-pointer-types]
 1107 |           gzclose(opt->fp_bwa1); gzclose(opt->fp_bwa2);
      |                   ~~~^~~~~~~~~
      |                      |
      |                      struct gzFile_s **
/usr/include/zlib.h:1634:39: note: expected ‘gzFile’ {aka ‘struct gzFile_s *’} but argument is of type ‘struct gzFile_s **’
 1634 | ZEXTERN int ZEXPORT    gzclose(gzFile file);
      |                                ~~~~~~~^~~~
/usr/include/zlib.h:1305:26: note: ‘gzFile’ declared here
 1305 | typedef struct gzFile_s *gzFile;    /* semi-opaque gzip file descriptor */
      |                          ^~~~~~
src/dwgsim.c:1107:45: warning: passing argument 1 of ‘gzclose’ from incompatible pointer type [-Wincompatible-pointer-types]
 1107 |           gzclose(opt->fp_bwa1); gzclose(opt->fp_bwa2);
      |                                          ~~~^~~~~~~~~
      |                                             |
      |                                             struct gzFile_s **
/usr/include/zlib.h:1634:39: note: expected ‘gzFile’ {aka ‘struct gzFile_s *’} but argument is of type ‘struct gzFile_s **’
 1634 | ZEXTERN int ZEXPORT    gzclose(gzFile file);
      |                                ~~~~~~~^~~~
/usr/include/zlib.h:1305:26: note: ‘gzFile’ declared here
 1305 | typedef struct gzFile_s *gzFile;    /* semi-opaque gzip file descriptor */
      |                          ^~~~~~
In file included from src/dwgsim.c:46:
src/mut.h: At top level:
src/mut.h:62:1: warning: inline function ‘mut_get_ins_long_n’ declared but never defined
   62 | mut_get_ins_long_n(uint8_t *ins, uint32_t *n);
      | ^~~~~~~~~~~~~~~~~~
src/mut.h:59:1: warning: inline function ‘mut_get_ins_bytes’ declared but never defined
   59 | mut_get_ins_bytes(int32_t n);
      | ^~~~~~~~~~~~~~~~~
make[2]: *** [Makefile:21: src/dwgsim.o] Error 1
make[2]: *** Waiting for unfinished jobs....
make[2]: Leaving directory '/build/reproducible-path/dwgsim-0.1.14'
dh_auto_build: error: make -j8 "INSTALL=install --strip-program=true" returned exit code 2
make[1]: *** [debian/rules:21: override_dh_auto_build] Error 25
make[1]: Leaving directory '/build/reproducible-path/dwgsim-0.1.14'
make: *** [debian/rules:16: binary] Error 2
dpkg-buildpackage: error: debian/rules binary subprocess returned exit status 2