Bug#1097281: libunicode-japanese-perl: ftbfs with GCC-15

[Matthias Klose]

Package: src:libunicode-japanese-perl
Version: 0.49-2
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/libunicode-japanese-perl_0.49-2_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

[...]
HOME=/sbuild-nonexistent
LANG=C.UTF-8
LC_ALL=C.UTF-8
LOGNAME=user42
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
SHELL=/bin/sh
USER=user42

dpkg-buildpackage
-----------------

Command: dpkg-buildpackage --sanitize-env -us -uc -b
dpkg-buildpackage: info: source package libunicode-japanese-perl
dpkg-buildpackage: info: source version 0.49-2
dpkg-buildpackage: info: source distribution unstable
dpkg-buildpackage: info: source changed by Jelmer Vernooij <jelmer at debian.org>
 dpkg-source --before-build .
dpkg-buildpackage: info: host architecture amd64
 debian/rules clean
dh clean
dh: warning: Compatibility levels before 10 are deprecated (level 9 in use)
   dh_clean
dh_clean: warning: Compatibility levels before 10 are deprecated (level 9 in use)
 debian/rules binary
dh binary
dh: warning: Compatibility levels before 10 are deprecated (level 9 in use)
   dh_update_autotools_config
   dh_auto_configure
dh_auto_configure: warning: Compatibility levels before 10 are deprecated (level 9 in use)
	/usr/bin/perl -I. Makefile.PL INSTALLDIRS=vendor "OPTIMIZE=-g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/libunicode-japanese-perl-0.49=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -Wdate-time -D_FORTIFY_SOURCE=2" "LD=x86_64-linux-gnu-gcc -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/libunicode-japanese-perl-0.49=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -Wl,-z,relro"
 >> invoke WriteMakefile
Checking if your kit is complete...
Looks good
**** hints/linux.pl ****
 >> enableXS...
 >> writing mediate.c, mediate.h
**** CONFIGURE ****
Checking if we can actually compile a C source file... : x86_64-linux-gnu-gcc  -D_REENTRANT -D_GNU_SOURCE -DDEBIAN -fwrapv -fno-strict-aliasing -pipe -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64  -I/usr/lib/x86_64-linux-gnu/perl/5.40/CORE  -DNDEBUG -c memmap_unix.c -o memmap_unix.o
 >> ok, the compilation test succeeded.
checking for size of word...
compiling... : x86_64-linux-gnu-gcc  -D_REENTRANT -D_GNU_SOURCE -DDEBIAN -fwrapv -fno-strict-aliasing -pipe -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64  -I/usr/lib/x86_64-linux-gnu/perl/5.40/CORE  -DNDEBUG wordsize.c -o wordsize
Generating a Unix-style Makefile
Writing Makefile for Unicode::Japanese
Writing MYMETA.yml and MYMETA.json
   dh_auto_build
dh_auto_build: warning: Compatibility levels before 10 are deprecated (level 9 in use)
	make -j1
make[1]: Entering directory '/build/reproducible-path/libunicode-japanese-perl-0.49'
cp lib/Unicode/Japanese/JA.pod blib/lib/Unicode/Japanese/JA.pod
cp lib/Unicode/Japanese.mlpod blib/lib/Unicode/Japanese.mlpod
cp lib/Unicode/Japanese.pm blib/lib/Unicode/Japanese.pm
Running Mkbootstrap for Japanese ()
chmod 644 "Japanese.bs"
"/usr/bin/perl" -MExtUtils::Command::MM -e 'cp_nonempty' -- Japanese.bs blib/arch/auto/Unicode/Japanese/Japanese.bs 644
"/usr/bin/perl" "/usr/share/perl/5.40/ExtUtils/xsubpp" -noprototypes -C++ -typemap '/usr/share/perl/5.40/ExtUtils/typemap'  Japanese.xs > Japanese.xsc
mv Japanese.xsc Japanese.c
x86_64-linux-gnu-gcc -c   -D_REENTRANT -D_GNU_SOURCE -DDEBIAN -fwrapv -fno-strict-aliasing -pipe -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64  -I/usr/lib/x86_64-linux-gnu/perl/5.40/CORE  -DNDEBUG -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/libunicode-japanese-perl-0.49=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -Wdate-time -D_FORTIFY_SOURCE=2   -DVERSION=\"0.49\" -DXS_VERSION=\"0.49\" -fPIC "-I/usr/lib/x86_64-linux-gnu/perl/5.40/CORE"  -DUJ_UINT32="unsigned int" -DUJ_UINT16="unsigned short" -DUJ_UINT8="unsigned char" Japanese.c
x86_64-linux-gnu-gcc -c   -D_REENTRANT -D_GNU_SOURCE -DDEBIAN -fwrapv -fno-strict-aliasing -pipe -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64  -I/usr/lib/x86_64-linux-gnu/perl/5.40/CORE  -DNDEBUG -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/libunicode-japanese-perl-0.49=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -Wdate-time -D_FORTIFY_SOURCE=2   -DVERSION=\"0.49\" -DXS_VERSION=\"0.49\" -fPIC "-I/usr/lib/x86_64-linux-gnu/perl/5.40/CORE"  -DUJ_UINT32="unsigned int" -DUJ_UINT16="unsigned short" -DUJ_UINT8="unsigned char" memmap_common.c
x86_64-linux-gnu-gcc -c   -D_REENTRANT -D_GNU_SOURCE -DDEBIAN -fwrapv -fno-strict-aliasing -pipe -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64  -I/usr/lib/x86_64-linux-gnu/perl/5.40/CORE  -DNDEBUG -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/libunicode-japanese-perl-0.49=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -Wdate-time -D_FORTIFY_SOURCE=2   -DVERSION=\"0.49\" -DXS_VERSION=\"0.49\" -fPIC "-I/usr/lib/x86_64-linux-gnu/perl/5.40/CORE"  -DUJ_UINT32="unsigned int" -DUJ_UINT16="unsigned short" -DUJ_UINT8="unsigned char" memmap_unix.c
x86_64-linux-gnu-gcc -c   -D_REENTRANT -D_GNU_SOURCE -DDEBIAN -fwrapv -fno-strict-aliasing -pipe -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64  -I/usr/lib/x86_64-linux-gnu/perl/5.40/CORE  -DNDEBUG -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/libunicode-japanese-perl-0.49=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -Wdate-time -D_FORTIFY_SOURCE=2   -DVERSION=\"0.49\" -DXS_VERSION=\"0.49\" -fPIC "-I/usr/lib/x86_64-linux-gnu/perl/5.40/CORE"  -DUJ_UINT32="unsigned int" -DUJ_UINT16="unsigned short" -DUJ_UINT8="unsigned char" conv.c
conv.c:37:14: error: expected ‘{’ before ‘bool’
   37 | typedef enum bool { false, true, } bool;
      |              ^~~~
conv.c:37:14: error: two or more data types in declaration specifiers
conv.c:37:14: warning: useless type name in empty declaration
make[1]: *** [Makefile:402: conv.o] Error 1
make[1]: Leaving directory '/build/reproducible-path/libunicode-japanese-perl-0.49'
dh_auto_build: error: make -j1 returned exit code 2
make: *** [debian/rules:4: binary] Error 255
dpkg-buildpackage: error: debian/rules binary subprocess returned exit status 2