Bug#1142958: libxs-parse-sublike-perl: autopkgtest failure on 32-bit architectures: compiler warnings

Package: libxs-parse-sublike-perl
Version: 0.41-1
Severity: serious
User: [email protected]
Usertags: autopkgtest

This package fails its autopkgtest checks with Perl 5.42 on 32-bit
architectures (armhf and i386 at least.)

  https://ci.debian.net/packages/libx/libxs-parse-sublike-perl/testing/armhf/73816092/

  117s autopkgtest [07:12:30]: test autodep8-perl-build-deps: /usr/share/pkg-perl-autopkgtest/runner build-deps
  117s autopkgtest [07:12:30]: test autodep8-perl-build-deps: [-----------------------
  118s Created MYMETA.yml and MYMETA.json
  118s Creating new 'Build' script for 'XS-Parse-Sublike' version '0.41'
  118s Building XS-Parse-Sublike
  118s arm-linux-gnueabihf-gcc -Isrc/ -I/usr/lib/arm-linux-gnueabihf/perl/5.42/CORE -fPIC -Ishare/include -Iinclude -Ihax -Wall -Wno-unused-function -Wno-unused-value -c -D_REENTRANT -D_GNU_SOURCE -DDEBIAN '-D_TIME_BITS=64' -fwrapv -fno-strict-aliasing -pipe -I/usr/local/include -D_LARGEFILE_SOURCE '-D_FILE_OFFSET_BITS=64' -O2 -g -o src/parse_subsignature_ex.o src/parse_subsignature_ex.c
  119s In file included from /usr/lib/arm-linux-gnueabihf/perl/5.42/CORE/perl.h:6199,
  119s                  from src/parse_subsignature_ex.c:4:
  119s src/parse_subsignature_ex.c: In function ‘opdump_argelems_named’:
  119s src/parse_subsignature_ex.c:473:22: warning: format ‘%llu’ expects argument of type ‘long long unsigned int’, but argument 4 has type ‘size_t’ {aka ‘unsigned int’} [-Wformat=]
  119s   473 |   opdump_printf(ctx, "PARAMS = (%" UVuf ")\n", aux->n_params);
  119s       |                      ^~~~~~~~~~~~~             ~~~~~~~~~~~~~
  119s       |                                                   |
  119s       |                                                   size_t {aka unsigned int}
  119s /usr/lib/arm-linux-gnueabihf/perl/5.42/CORE/embed.h:483:76: note: in definition of macro ‘opdump_printf’
  119s   483 | # define opdump_printf(a,...)                   Perl_opdump_printf(aTHX_ a,__VA_ARGS__)
[...]
  239s autopkgtest [07:14:32]: @@@@@@@@@@@@@@@@@@@@ summary
  239s autodep8-perl-build-deps FAIL stderr: In file included from /usr/lib/arm-linux-gnueabihf/perl/5.42/CORE/perl.h:6199,
  239s autodep8-perl        PASS (superficial)
  239s autodep8-perl-recommends PASS (superficial)

This is currently considered a src:perl regression.  I assume it regressed with 

  https://github.com/Perl/perl5/commit/1eab73a91a97030ed9ce247321dea85de835f830

but I doubt there's anything to fix on that side.  I didn't investigate
much though. Feel free to reassign of course.

Possibly just redirecting stderr also in the './Build' phase of
debian/tests/pkg-perl/smoke-setup is enough to fix this.