Bug#1097178: libdate-calc-xs-perl: ftbfs with GCC-15

[Matthias Klose]

Package: src:libdate-calc-xs-perl
Version: 6.4-2
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/libdate-calc-xs-perl_6.4-2_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

[...]

Sufficient free space for build

User Environment
----------------

APT_CONFIG=/var/lib/sbuild/apt.conf
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 libdate-calc-xs-perl
dpkg-buildpackage: info: source version 6.4-2
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_clean
 debian/rules binary
dh binary
   dh_update_autotools_config
   dh_autoreconf
   dh_auto_configure
	/usr/bin/perl Makefile.PL INSTALLDIRS=vendor "OPTIMIZE=-g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/libdate-calc-xs-perl-6.4=. -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/libdate-calc-xs-perl-6.4=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -Wl,-z,relro"

*************************************************************
****** BEWARE: Use "make install UNINST=1" to install! ******
*************************************************************

Checking if your kit is complete...
Looks good
Invalid LICENSE value 'perl,lgpl' ignored
Invalid LICENSE value 'perl,lgpl' ignored
Generating a Unix-style Makefile
Writing Makefile for Date::Calc::XS
Writing MYMETA.yml and MYMETA.json
Writing patchlevel.h for /usr/bin/perl (5.040000)
   dh_auto_build
	make -j8
make[1]: Entering directory '/build/reproducible-path/libdate-calc-xs-perl-6.4'
Running Mkbootstrap for XS ()
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 -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/libdate-calc-xs-perl-6.4=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -Wdate-time -D_FORTIFY_SOURCE=2   -DVERSION=\"6.4\" -DXS_VERSION=\"6.4\" -fPIC "-I/usr/lib/x86_64-linux-gnu/perl/5.40/CORE"   DateCalc.c
"/usr/bin/perl" "/usr/share/perl/5.40/ExtUtils/xsubpp"  -typemap '/usr/share/perl/5.40/ExtUtils/typemap' -typemap '/build/reproducible-path/libdate-calc-xs-perl-6.4/typemap'  XS.xs > XS.xsc
chmod 644 "XS.bs"
"/usr/bin/perl" -MExtUtils::Command::MM -e 'cp_nonempty' -- XS.bs blib/arch/auto/Date/Calc/XS/XS.bs 644
cp lib/Date/Calc/XS.pm blib/lib/Date/Calc/XS.pm
cp lib/Date/Calc/XS.pod blib/lib/Date/Calc/XS.pod
In file included from DateCalc.c:15:
ToolBox.h:98:20: error: cannot use keyword ‘false’ as enumeration constant
   98 |             enum { false, true };
      |                    ^~~~~
ToolBox.h:98:20: note: ‘false’ is a keyword with ‘-std=c23’ onwards
mv XS.xsc XS.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 -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/libdate-calc-xs-perl-6.4=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -Wdate-time -D_FORTIFY_SOURCE=2   -DVERSION=\"6.4\" -DXS_VERSION=\"6.4\" -fPIC "-I/usr/lib/x86_64-linux-gnu/perl/5.40/CORE"   XS.c
make[1]: *** [Makefile:342: DateCalc.o] Error 1
make[1]: *** Waiting for unfinished jobs....
make[1]: Leaving directory '/build/reproducible-path/libdate-calc-xs-perl-6.4'
dh_auto_build: error: make -j8 returned exit code 2
make: *** [debian/rules:4: binary] Error 25
dpkg-buildpackage: error: debian/rules binary subprocess returned exit status 2