[DRE-maint] Bug#1097825: ruby3.1: ftbfs with GCC-15

[Matthias Klose]

Package: src:ruby3.1
Version: 3.1.2-8.5
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/ruby3.1_3.1.2-8.5_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

[...]
      |                                         |
      |                                         VALUE (*)(VALUE,  VALUE) {aka long unsigned int (*)(long unsigned int,  long unsigned int)}
file.c:6512:52: note: expected ‘VALUE (*)(void)’ {aka ‘long unsigned int (*)(void)’} but argument is of type ‘VALUE (*)(VALUE,  VALUE)’ {aka ‘long unsigned int (*)(long unsigned int,  long unsigned int)’}
 6512 | define_filetest_function(const char *name, VALUE (*func)(ANYARGS), int argc)
      |                                            ~~~~~~~~^~~~~~~~~~~~~~
file.c:2121:1: note: ‘rb_file_suid_p’ declared here
 2121 | rb_file_suid_p(VALUE obj, VALUE fname)
      | ^~~~~~~~~~~~~~
file.c:6731:41: error: passing argument 2 of ‘define_filetest_function’ from incompatible pointer type [-Wincompatible-pointer-types]
 6731 |     define_filetest_function("setgid?", rb_file_sgid_p, 1);
      |                                         ^~~~~~~~~~~~~~
      |                                         |
      |                                         VALUE (*)(VALUE,  VALUE) {aka long unsigned int (*)(long unsigned int,  long unsigned int)}
file.c:6512:52: note: expected ‘VALUE (*)(void)’ {aka ‘long unsigned int (*)(void)’} but argument is of type ‘VALUE (*)(VALUE,  VALUE)’ {aka ‘long unsigned int (*)(long unsigned int,  long unsigned int)’}
 6512 | define_filetest_function(const char *name, VALUE (*func)(ANYARGS), int argc)
      |                                            ~~~~~~~~^~~~~~~~~~~~~~
file.c:2140:1: note: ‘rb_file_sgid_p’ declared here
 2140 | rb_file_sgid_p(VALUE obj, VALUE fname)
      | ^~~~~~~~~~~~~~
file.c:6732:41: error: passing argument 2 of ‘define_filetest_function’ from incompatible pointer type [-Wincompatible-pointer-types]
 6732 |     define_filetest_function("sticky?", rb_file_sticky_p, 1);
      |                                         ^~~~~~~~~~~~~~~~
      |                                         |
      |                                         VALUE (*)(VALUE,  VALUE) {aka long unsigned int (*)(long unsigned int,  long unsigned int)}
file.c:6512:52: note: expected ‘VALUE (*)(void)’ {aka ‘long unsigned int (*)(void)’} but argument is of type ‘VALUE (*)(VALUE,  VALUE)’ {aka ‘long unsigned int (*)(long unsigned int,  long unsigned int)’}
 6512 | define_filetest_function(const char *name, VALUE (*func)(ANYARGS), int argc)
      |                                            ~~~~~~~~^~~~~~~~~~~~~~
file.c:2159:1: note: ‘rb_file_sticky_p’ declared here
 2159 | rb_file_sticky_p(VALUE obj, VALUE fname)
      | ^~~~~~~~~~~~~~~~
file.c:6734:44: error: passing argument 2 of ‘define_filetest_function’ from incompatible pointer type [-Wincompatible-pointer-types]
 6734 |     define_filetest_function("identical?", rb_file_identical_p, 2);
      |                                            ^~~~~~~~~~~~~~~~~~~
      |                                            |
      |                                            VALUE (*)(VALUE,  VALUE,  VALUE) {aka long unsigned int (*)(long unsigned int,  long unsigned int,  long unsigned int)}
file.c:6512:52: note: expected ‘VALUE (*)(void)’ {aka ‘long unsigned int (*)(void)’} but argument is of type ‘VALUE (*)(VALUE,  VALUE,  VALUE)’ {aka ‘long unsigned int (*)(long unsigned int,  long unsigned int,  long unsigned int)’}
 6512 | define_filetest_function(const char *name, VALUE (*func)(ANYARGS), int argc)
      |                                            ~~~~~~~~^~~~~~~~~~~~~~
file.c:2188:1: note: ‘rb_file_identical_p’ declared here
 2188 | rb_file_identical_p(VALUE obj, VALUE fname1, VALUE fname2)
      | ^~~~~~~~~~~~~~~~~~~
In file included from ./include/ruby/ruby.h:26,
                 from ./include/ruby/encoding.h:19,
                 from encindex.h:14,
                 from file.c:156:
./include/ruby/internal/anyargs.h:287:135: error: passing argument 3 of ‘rb_define_method_m3’ from incompatible pointer type [-Wincompatible-pointer-types]
  287 | #define rb_define_method(klass, mid, func, arity)           RBIMPL_ANYARGS_DISPATCH_rb_define_method((arity), (func))((klass), (mid), (func), (arity))
      |                                                                                                                                       ^~~~~~
      |                                                                                                                                       |
      |                                                                                                                                       __attribute__((noreturn)) VALUE (*)(int,  const VALUE *, VALUE,  VALUE) {aka __attribute__((noreturn)) long unsigned int (*)(int,  const long unsigned int *, long unsigned int,  long unsigned int)}
file.c:6926:5: note: in expansion of macro ‘rb_define_method’
 6926 |     rb_define_method(rb_cStat, "birthtime", rb_stat_birthtime, 0);
      |     ^~~~~~~~~~~~~~~~
./include/ruby/internal/anyargs.h:276:21: note: expected ‘VALUE (*)(void)’ {aka ‘long unsigned int (*)(void)’} but argument is of type ‘__attribute__((noreturn)) VALUE (*)(int,  const VALUE *, VALUE,  VALUE)’ {aka ‘__attribute__((noreturn)) long unsigned int (*)(int,  const long unsigned int *, long unsigned int,  long unsigned int)’}
  276 | RBIMPL_ANYARGS_DECL(rb_define_method, VALUE, const char *)
      |                     ^~~~~~~~~~~~~~~~
./include/ruby/internal/anyargs.h:251:41: note: in definition of macro ‘RBIMPL_ANYARGS_DECL’
  251 | RBIMPL_ANYARGS_ATTRSET(sym) static void sym ## _m3(__VA_ARGS__, VALUE(*)(ANYARGS), int); \
      |                                         ^~~
In file included from ./include/ruby/internal/anyargs.h:77:
./include/ruby/internal/intern/vm.h:403:7: note: ‘rb_f_notimplement’ declared here
  403 | VALUE rb_f_notimplement(int argc, const VALUE *argv, VALUE obj, VALUE marker);
      |       ^~~~~~~~~~~~~~~~~
make[2]: *** [Makefile:434: file.o] Error 1
make[2]: Leaving directory '/build/reproducible-path/ruby3.1-3.1.2'
dh_auto_build: error: make -j8 main V=1 returned exit code 2
make[1]: *** [debian/rules:114: override_dh_auto_build-arch] Error 25
make[1]: Leaving directory '/build/reproducible-path/ruby3.1-3.1.2'
make: *** [debian/rules:92: binary] Error 2
dpkg-buildpackage: error: debian/rules binary subprocess returned exit status 2