[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/ipip_1.1.13_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 [...] 180 | int slip_open(); | ^~~~~~~~~ main.c:151:30: error: passing argument 2 of ‘signal’ from incompatible pointer type [-Wincompatible-pointer-types] 151 | (void)signal(SIGINT, terminator); | ^~~~~~~~~~ | | | 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) | ~~~~~~~~~~~~~~~^~~~~~~~~ main.c:34:13: note: ‘terminator’ declared here 34 | static void terminator(); | ^~~~~~~~~~ /usr/include/signal.h:72:16: note: ‘__sighandler_t’ declared here 72 | typedef void (*__sighandler_t) (int); | ^~~~~~~~~~~~~~ main.c:160:12: error: too many arguments to function ‘read_config’; expected 0, have 1 160 | if(read_config(configfile)<0){ | ^~~~~~~~~~~ ~~~~~~~~~~ ipip.h:198:5: note: declared here 198 | int read_config(); | ^~~~~~~~~~~ main.c:181:12: error: too many arguments to function ‘read_routes’; expected 0, have 1 181 | if(read_routes(routefile)<0){ | ^~~~~~~~~~~ ~~~~~~~~~ ipip.h:195:5: note: declared here 195 | int read_routes(); | ^~~~~~~~~~~ main.c:198:9: error: too many arguments to function ‘send_stats’; expected 0, have 1 198 | send_stats(1); | ^~~~~~~~~~ ~ ipip.h:201:6: note: declared here 201 | void send_stats(); | ^~~~~~~~~~ slip.c: In function ‘slip_read’: slip.c:222:5: warning: old-style function definition [-Wold-style-definition] 222 | int slip_read(ifp, m) | ^~~~~~~~~ slip.c:225:1: error: number of arguments doesn’t match prototype 225 | { | ^ ipip.h:182:5: error: prototype declaration 182 | int slip_read(); | ^~~~~~~~~ slip.c:253:21: error: too many arguments to function ‘assemble_slip’; expected 0, have 2 253 | n = assemble_slip(s, s->buffer[s->bnext]); | ^~~~~~~~~~~~~ ~ slip.c:76:12: note: declared here 76 | static int assemble_slip(); | ^~~~~~~~~~~~~ slip.c: In function ‘slip_send’: slip.c:275:5: warning: old-style function definition [-Wold-style-definition] 275 | int slip_send(ifp, m) | ^~~~~~~~~ slip.c:278:1: error: number of arguments doesn’t match prototype 278 | { | ^ ipip.h:181:5: error: prototype declaration 181 | int slip_send(); | ^~~~~~~~~ slip.c: In function ‘assemble_slip’: slip.c:337:1: warning: old-style function definition [-Wold-style-definition] 337 | assemble_slip(s, c) | ^~~~~~~~~~~~~ make[1]: *** [<builtin>: main.o] Error 1 make[1]: *** [<builtin>: slip.o] Error 1 make[1]: Leaving directory '/build/reproducible-path/ipip-1.1.13' dh_auto_build: error: make -j8 "INSTALL=install --strip-program=true" returned exit code 2 make: *** [debian/rules:8: binary] Error 255 dpkg-buildpackage: error: debian/rules binary subprocess returned exit status 2