Bug#1097174: libconvert-binary-c-perl: ftbfs with GCC-15

[Matthias Klose]

Package: src:libconvert-binary-c-perl
Version: 0.85-1
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/libconvert-binary-c-perl_0.85-1_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

[...]
  560 |         scan_node(htt->tree[1], action, NULL, 0);
      |                                 ^~~~~~
      |                                 |
      |                                 void (*)(void *)
ucpp/nhash.c:446:54: note: expected ‘void (*)(void)’ but argument is of type ‘void (*)(void *)’
  446 | static void scan_node(hash_item_header *node, void (*action)(), void *arg, unsigned flags)
      |                                               ~~~~~~~^~~~~~~~~
ucpp/nhash.c: In function ‘ucpp_private_HTT2_scan_arg’:
ucpp/nhash.c:565:33: error: passing argument 2 of ‘scan_node’ from incompatible pointer type [-Wincompatible-pointer-types]
  565 |         scan_node(htt->tree[0], action, arg, SCAN_FLAG_ARG);
      |                                 ^~~~~~
      |                                 |
      |                                 void (*)(void *, void *)
ucpp/nhash.c:446:54: note: expected ‘void (*)(void)’ but argument is of type ‘void (*)(void *, void *)’
  446 | static void scan_node(hash_item_header *node, void (*action)(), void *arg, unsigned flags)
      |                                               ~~~~~~~^~~~~~~~~
ucpp/nhash.c:566:33: error: passing argument 2 of ‘scan_node’ from incompatible pointer type [-Wincompatible-pointer-types]
  566 |         scan_node(htt->tree[1], action, arg, SCAN_FLAG_ARG);
      |                                 ^~~~~~
      |                                 |
      |                                 void (*)(void *, void *)
ucpp/nhash.c:446:54: note: expected ‘void (*)(void)’ but argument is of type ‘void (*)(void *, void *)’
  446 | static void scan_node(hash_item_header *node, void (*action)(), void *arg, unsigned flags)
      |                                               ~~~~~~~^~~~~~~~~
ucpp/nhash.c: In function ‘ucpp_private_HTT_kill’:
ucpp/nhash.c:575:44: error: passing argument 2 of ‘scan_node’ from incompatible pointer type [-Wincompatible-pointer-types]
  575 |                 scan_node(htt->tree[u], htt->deldata, NULL, SCAN_FLAG_WIPE);
      |                                         ~~~^~~~~~~~~
      |                                            |
      |                                            void (*)(void *)
ucpp/nhash.c:446:54: note: expected ‘void (*)(void)’ but argument is of type ‘void (*)(void *)’
  446 | static void scan_node(hash_item_header *node, void (*action)(), void *arg, unsigned flags)
      |                                               ~~~~~~~^~~~~~~~~
ucpp/nhash.c: In function ‘ucpp_private_HTT2_kill’:
ucpp/nhash.c:582:36: error: passing argument 2 of ‘scan_node’ from incompatible pointer type [-Wincompatible-pointer-types]
  582 |         scan_node(htt->tree[0], htt->deldata, NULL, SCAN_FLAG_WIPE);
      |                                 ~~~^~~~~~~~~
      |                                    |
      |                                    void (*)(void *)
ucpp/nhash.c:446:54: note: expected ‘void (*)(void)’ but argument is of type ‘void (*)(void *)’
  446 | static void scan_node(hash_item_header *node, void (*action)(), void *arg, unsigned flags)
      |                                               ~~~~~~~^~~~~~~~~
ucpp/nhash.c:583:36: error: passing argument 2 of ‘scan_node’ from incompatible pointer type [-Wincompatible-pointer-types]
  583 |         scan_node(htt->tree[1], htt->deldata, NULL, SCAN_FLAG_WIPE);
      |                                 ~~~^~~~~~~~~
      |                                    |
      |                                    void (*)(void *)
ucpp/nhash.c:446:54: note: expected ‘void (*)(void)’ but argument is of type ‘void (*)(void *)’
  446 | static void scan_node(hash_item_header *node, void (*action)(), void *arg, unsigned flags)
      |                                               ~~~~~~~^~~~~~~~~
make[1]: *** [Makefile:404: ucpp/nhash.o] Error 1
make[1]: *** Waiting for unfinished jobs....
mv pack.o tmppack.o
mv tmppack.o cbc/pack.o
mv option.o tmpoption.o
mv tmpoption.o cbc/option.o
mv eval.o tmpeval.o
mv tmpeval.o ucpp/eval.o
mv lexer.o tmplexer.o
mv tmplexer.o ucpp/lexer.o
mv cpp.o tmpcpp.o
mv tmpcpp.o ucpp/cpp.o
mv macro.o tmpmacro.o
mv tmpmacro.o ucpp/macro.o
mv y_parser.o tmpy_parser.o
mv tmpy_parser.o ctlib/y_parser.o
make[1]: Leaving directory '/build/reproducible-path/libconvert-binary-c-perl-0.85'
dh_auto_build: error: make -j8 returned exit code 2
make: *** [debian/rules:6: binary] Error 25
dpkg-buildpackage: error: debian/rules binary subprocess returned exit status 2