[Debian-med-packaging] Bug#1098072: volpack: ftbfs with GCC-15

[Matthias Klose]

Package: src:volpack
Version: 1.0b3-10
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/volpack_1.0b3-10_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

[...]
vp_context.c: In function 'vpSetCallback':
vp_context.c:1164:1: warning: old-style function definition [-Wold-style-definition]
 1164 | vpSetCallback(vpc, option, func)
      | ^~~~~~~~~~~~~
vp_context.c:1183:28: error: assignment to 'int (*)(int,  void *, unsigned int)' from incompatible pointer type 'int (*)(void)' [-Wincompatible-pointer-types]
 1183 |             vpc->read_func = read;
      |                            ^
vp_context.c:1169:16: note: 'read' declared here
 1169 |     extern int read(), write();
      |                ^~~~
vp_context.c:1189:29: error: assignment to 'int (*)(int,  void *, unsigned int)' from incompatible pointer type 'int (*)(void)' [-Wincompatible-pointer-types]
 1189 |             vpc->write_func = write;
      |                             ^
vp_context.c:1169:24: note: 'write' declared here
 1169 |     extern int read(), write();
      |                        ^~~~~
vp_context.c: In function 'vpSetClientData':
vp_context.c:1227:1: warning: old-style function definition [-Wold-style-definition]
 1227 | vpSetClientData(vpc, client_data)
      | ^~~~~~~~~~~~~~~
vp_context.c: In function 'vpSetDebug':
vp_context.c:1242:1: warning: old-style function definition [-Wold-style-definition]
 1242 | vpSetDebug(vpc, flag, value)
      | ^~~~~~~~~~
vp_context.c: In function 'vpTracePixel':
vp_context.c:1262:1: warning: old-style function definition [-Wold-style-definition]
 1262 | vpTracePixel(vpc, trace_u, trace_v)
      | ^~~~~~~~~~~~
vp_context.c: In function 'vpGeti':
vp_context.c:1280:1: warning: old-style function definition [-Wold-style-definition]
 1280 | vpGeti(vpc, option, iptr)
      | ^~~~~~
vp_context.c: In function 'vpGetd':
vp_context.c:1531:1: warning: old-style function definition [-Wold-style-definition]
 1531 | vpGetd(vpc, option, dptr)
      | ^~~~~~
vp_context.c: In function 'vpGetp':
vp_context.c:1567:1: warning: old-style function definition [-Wold-style-definition]
 1567 | vpGetp(vpc, option, pptr)
      | ^~~~~~
vp_context.c: In function 'vpGetMaterial':
vp_context.c:1631:1: warning: old-style function definition [-Wold-style-definition]
 1631 | vpGetMaterial(vpc, material, property, surface_side, r, g, b)
      | ^~~~~~~~~~~~~
vp_context.c: In function 'vpGetLight':
vp_context.c:1696:1: warning: old-style function definition [-Wold-style-definition]
 1696 | vpGetLight(vpc, light_num, property, n0, n1, n2)
      | ^~~~~~~~~~
vp_context.c: In function 'vpGetImage':
vp_context.c:1729:1: warning: old-style function definition [-Wold-style-definition]
 1729 | vpGetImage(vpc, image, width, height, scan_bytes, pixel_type, image_type)
      | ^~~~~~~~~~
vp_context.c: In function 'vpGetTimer':
vp_context.c:2030:1: warning: old-style function definition [-Wold-style-definition]
 2030 | vpGetTimer(vpc, option, iptr)
      | ^~~~~~~~~~
vp_context.c: In function 'vpClearTimer':
vp_context.c:2052:1: warning: old-style function definition [-Wold-style-definition]
 2052 | vpClearTimer(vpc, option)
      | ^~~~~~~~~~~~
make[1]: *** [Makefile:645: vp_context.lo] Error 1
libtool: compile:  gcc -DHAVE_CONFIG_H -I. -Wdate-time -D_FORTIFY_SOURCE=2 -DCOMP_AC11B -DCOMP_AC31B -DCOMP_AC32B -DCOMP_AR11B -DCOMP_AR31B -DCOMP_AR32B -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/volpack-1.0b3=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -c vp_check.c -o vp_check.o >/dev/null 2>&1
libtool: compile:  gcc -DHAVE_CONFIG_H -I. -Wdate-time -D_FORTIFY_SOURCE=2 -DCOMP_AC11B -DCOMP_AC31B -DCOMP_AC32B -DCOMP_AR11B -DCOMP_AR31B -DCOMP_AR32B -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/volpack-1.0b3=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -c vp_linalg.c -o vp_linalg.o >/dev/null 2>&1
libtool: compile:  gcc -DHAVE_CONFIG_H -I. -Wdate-time -D_FORTIFY_SOURCE=2 -DCOMP_AC11B -DCOMP_AC31B -DCOMP_AC32B -DCOMP_AR11B -DCOMP_AR31B -DCOMP_AR32B -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/volpack-1.0b3=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -c vp_file.c -o vp_file.o >/dev/null 2>&1
libtool: compile:  gcc -DHAVE_CONFIG_H -I. -Wdate-time -D_FORTIFY_SOURCE=2 -DCOMP_AC11B -DCOMP_AC31B -DCOMP_AC32B -DCOMP_AR11B -DCOMP_AR31B -DCOMP_AR32B -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/volpack-1.0b3=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -c vp_renderB.c -o vp_renderB.o >/dev/null 2>&1
libtool: compile:  gcc -DHAVE_CONFIG_H -I. -Wdate-time -D_FORTIFY_SOURCE=2 -DCOMP_AC11B -DCOMP_AC31B -DCOMP_AC32B -DCOMP_AR11B -DCOMP_AR31B -DCOMP_AR32B -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/volpack-1.0b3=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -c vp_octree.c -o vp_octree.o >/dev/null 2>&1
make[1]: Leaving directory '/build/reproducible-path/volpack-1.0b3'
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