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Bug#1097548: parprouted: ftbfs with GCC-15



Package: src:parprouted
Version: 0.70-4
Severity: important
Tags: sid forky
User: debian-gcc@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/parprouted_0.70-4_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

[...]
      |                    ^~~~~~~~~~
      |                    |
      |                    void (*)(void)
/usr/include/signal.h:88:57: note: expected ‘__sighandler_t’ {aka ‘void (*)(int)’} but argument is of type ‘void (*)(void)’
   88 | extern __sighandler_t signal (int __sig, __sighandler_t __handler)
      |                                          ~~~~~~~~~~~~~~~^~~~~~~~~
parprouted.c:349:6: note: ‘sighandler’ declared here
  349 | void sighandler()
      |      ^~~~~~~~~~
/usr/include/signal.h:72:16: note: ‘__sighandler_t’ declared here
   72 | typedef void (*__sighandler_t) (int);
      |                ^~~~~~~~~~~~~~
parprouted.c:455:21: error: passing argument 2 of ‘signal’ from incompatible pointer type [-Wincompatible-pointer-types]
  455 |     signal(SIGTERM, sighandler);
      |                     ^~~~~~~~~~
      |                     |
      |                     void (*)(void)
/usr/include/signal.h:88:57: note: expected ‘__sighandler_t’ {aka ‘void (*)(int)’} but argument is of type ‘void (*)(void)’
   88 | extern __sighandler_t signal (int __sig, __sighandler_t __handler)
      |                                          ~~~~~~~~~~~~~~~^~~~~~~~~
parprouted.c:349:6: note: ‘sighandler’ declared here
  349 | void sighandler()
      |      ^~~~~~~~~~
/usr/include/signal.h:72:16: note: ‘__sighandler_t’ declared here
   72 | typedef void (*__sighandler_t) (int);
      |                ^~~~~~~~~~~~~~
parprouted.c:456:20: error: passing argument 2 of ‘signal’ from incompatible pointer type [-Wincompatible-pointer-types]
  456 |     signal(SIGHUP, sighandler);
      |                    ^~~~~~~~~~
      |                    |
      |                    void (*)(void)
/usr/include/signal.h:88:57: note: expected ‘__sighandler_t’ {aka ‘void (*)(int)’} but argument is of type ‘void (*)(void)’
   88 | extern __sighandler_t signal (int __sig, __sighandler_t __handler)
      |                                          ~~~~~~~~~~~~~~~^~~~~~~~~
parprouted.c:349:6: note: ‘sighandler’ declared here
  349 | void sighandler()
      |      ^~~~~~~~~~
/usr/include/signal.h:72:16: note: ‘__sighandler_t’ declared here
   72 | typedef void (*__sighandler_t) (int);
      |                ^~~~~~~~~~~~~~
parprouted.c:468:62: error: passing argument 3 of ‘pthread_create’ from incompatible pointer type [-Wincompatible-pointer-types]
  468 |     if (pthread_create(&my_threads[++last_thread_idx], NULL, main_thread, NULL)) {
      |                                                              ^~~~~~~~~~~
      |                                                              |
      |                                                              void * (*)(void)
In file included from parprouted.h:48:
/usr/include/pthread.h:204:36: note: expected ‘void * (*)(void *)’ but argument is of type ‘void * (*)(void)’
  204 |                            void *(*__start_routine) (void *),
      |                            ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
parprouted.c:355:7: note: ‘main_thread’ declared here
  355 | void *main_thread()
      |       ^~~~~~~~~~~
make[1]: *** [<builtin>: parprouted.o] Error 1
make[1]: *** Waiting for unfinished jobs....
arp.c: In function ‘arp_reply’:
arp.c:90:27: warning: taking address of packed member of ‘struct _ether_arp_frame’ may result in an unaligned pointer value [-Waddress-of-packed-member]
   90 |   struct ether_arp *arp = &reqframe->arp;
      |                           ^~~~~~~~~~~~~~
arp.c: In function ‘arp_req’:
arp.c:134:27: warning: taking address of packed member of ‘struct _ether_arp_frame’ may result in an unaligned pointer value [-Waddress-of-packed-member]
  134 |   struct ether_arp *arp = &frame.arp;
      |                           ^~~~~~~~~~
arp.c: In function ‘arp’:
arp.c:392:11: warning: ‘__builtin_strncpy’ specified bound 16 equals destination size [-Wstringop-truncation]
  392 |           strncpy(k_arpreq.arp_dev, ifname, sizeof(k_arpreq.arp_dev));
      |           ^
make[1]: Leaving directory '/build/reproducible-path/parprouted-0.70'
dh_auto_build: error: make -j8 "INSTALL=install --strip-program=true" returned exit code 2
make: *** [debian/rules:23: binary] Error 25
dpkg-buildpackage: error: debian/rules binary subprocess returned exit status 2


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