Bug#1096480: crispy-doom: ftbfs with GCC-15

[Matthias Klose]

Package: src:crispy-doom
Version: 7.0-1
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/crispy-doom_7.0-1_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

[...]
../../src/doomtype.h:113:5: error: cannot use keyword ‘false’ as enumeration constant
  113 |     false,
      |     ^~~~~
../../src/doomtype.h:113:5: note: ‘false’ is a keyword with ‘-std=c23’ onwards
In file included from ../../src/sha1.h:21,
                 from ../../src/deh_defs.h:21,
                 from deh_doom.c:19:
../../src/doomtype.h:113:5: error: cannot use keyword ‘false’ as enumeration constant
  113 |     false,
      |     ^~~~~
../../src/doomtype.h:113:5: note: ‘false’ is a keyword with ‘-std=c23’ onwards
In file included from ../../src/sha1.h:21,
                 from ../../src/deh_defs.h:21,
                 from deh_bexstr.c:22:
../../src/doomtype.h:113:5: error: cannot use keyword ‘false’ as enumeration constant
  113 |     false,
      |     ^~~~~
../../src/doomtype.h:113:5: note: ‘false’ is a keyword with ‘-std=c23’ onwards
In file included from ../../src/sha1.h:21,
                 from ../../src/deh_defs.h:21,
                 from ../../src/deh_io.h:21,
                 from deh_bexpars.c:23:
../../src/doomtype.h:113:5: error: cannot use keyword ‘false’ as enumeration constant
  113 |     false,
      |     ^~~~~
../../src/doomtype.h:113:5: note: ‘false’ is a keyword with ‘-std=c23’ onwards
In file included from doomdef.h:26,
                 from deh_ammo.c:22:
../../src/doomtype.h:113:5: error: cannot use keyword ‘false’ as enumeration constant
  113 |     false,
      |     ^~~~~
../../src/doomtype.h:113:5: note: ‘false’ is a keyword with ‘-std=c23’ onwards
In file included from deh_cheat.c:21:
../../src/doomtype.h:113:5: error: cannot use keyword ‘false’ as enumeration constant
  113 |     false,
      |     ^~~~~
../../src/doomtype.h:113:5: note: ‘false’ is a keyword with ‘-std=c23’ onwards
make[4]: *** [Makefile:586: deh_bexpars.o] Error 1
make[4]: *** Waiting for unfinished jobs....
make[4]: *** [Makefile:586: deh_bexstr.o] Error 1
In file included from ../../src/sha1.h:21,
                 from ../../src/deh_defs.h:21,
                 from ../../src/deh_io.h:21,
                 from deh_bexptr.c:25:
../../src/doomtype.h:113:5: error: cannot use keyword ‘false’ as enumeration constant
  113 |     false,
      |     ^~~~~
../../src/doomtype.h:113:5: note: ‘false’ is a keyword with ‘-std=c23’ onwards
In file included from ../../src/m_misc.h:27,
                 from deh_bexincl.c:23:
../../src/doomtype.h:113:5: error: cannot use keyword ‘false’ as enumeration constant
  113 |     false,
      |     ^~~~~
../../src/doomtype.h:113:5: note: ‘false’ is a keyword with ‘-std=c23’ onwards
make[4]: *** [Makefile:586: deh_doom.o] Error 1
make[4]: *** [Makefile:586: deh_bexincl.o] Error 1
make[4]: *** [Makefile:586: deh_bexptr.o] Error 1
make[4]: *** [Makefile:586: deh_ammo.o] Error 1
make[4]: *** [Makefile:586: deh_cheat.o] Error 1
make[4]: *** [Makefile:586: am_map.o] Error 1
make[4]: Leaving directory '/build/reproducible-path/crispy-doom-7.0/src/doom'
make[3]: *** [Makefile:1156: all-recursive] Error 1
make[3]: Leaving directory '/build/reproducible-path/crispy-doom-7.0/src'
make[2]: *** [Makefile:514: all-recursive] Error 1
make[2]: Leaving directory '/build/reproducible-path/crispy-doom-7.0'
make[1]: *** [Makefile:430: all] Error 2
make[1]: Leaving directory '/build/reproducible-path/crispy-doom-7.0'
dh_auto_build: error: make -j8 returned exit code 2
make: *** [debian/rules:9: binary] Error 25
dpkg-buildpackage: error: debian/rules binary subprocess returned exit status 2