PAR::Packer is not buildable on relocatable-perl 5.40.0.1

[gugod]

This is perhaps not directly related to relocatable-perl, but I'm sharing some brief finding here first.

Basically, cpm install -g PAR::Packer failed in relocatable-perl 5.40.0.1 with this compilation error:

cc main.o sha1.o  -s -Wl,-E  -fstack-protector-strong -L/usr/local/lib  -L/home/gugod/perl5/perlbrew/perls/skaji-relocatable-perl-5.40.0.1/lib/5.40.0/x86_64-linux/CORE -lperl -lpthread -ldl -lm -lcrypt -lutil -lc  -o ./par
/usr/bin/ld: /home/gugod/perl5/perlbrew/perls/skaji-relocatable-perl-5.40.0.1/lib/5.40.0/x86_64-linux/CORE/libperl.a(perl.o): in function `perl_construct':
/tmp/perl-build-1728287368.1/perl-5.40.0/perl.c:326:(.text+0x281b): undefined reference to `_LIB_VERSION'
collect2: error: ld returned 1 exit status

Here's how I could reproduce it on my Fedora Linux:

# uname -srvmo  
Linux 6.11.5-300.fc41.x86_64 #1 SMP PREEMPT_DYNAMIC Tue Oct 22 20:11:15 UTC 2024 x86_64 GNU/Linux


# perlbrew --version
/home/gugod/perl5/perlbrew/bin/perlbrew  - App::perlbrew/1.01

## This step would download and install this tarball: https://github.com/skaji/relocatable-perl/releases/download/5.40.0.1/perl-linux-amd64.tar.gz
# perlbrew install skaji-relocatable-perl-5.40.0.1 

# perlbrew use skaji-relocatable-perl-5.40.0.1 

# which perl                                  
~/perl5/perlbrew/perls/skaji-relocatable-perl-5.40.0.1/bin/perl

# perl -V | grep config
Summary of my perl5 (revision 5 version 40 subversion 0) configuration:
    config_args='-Dprefix=/opt/perl -Duserelocatableinc -Dman1dir=none -Dman3dir=none -DDEBUGGING=-g -des -Ui_xlocale -Dlibs=-lpthread -ldl -lm -lcrypt -lutil -lc -Dd_crypt -Dlibpth=/lib /lib/x86_64-linux-gnu /lib64 /usr/lib /usr/lib/x86_64-linux-gnu /usr/lib64 /usr/local/lib /usr/local/lib64'

# cpm install -g --show-build-log-on-failure PAR::Packer
.......
2024-12-23T08:41:34,118330,PAR-Packer-1.063| cc main.o sha1.o  -s -Wl,-E  -fstack-protector-strong -L/usr/local/lib  -L/home/gugod/perl5/perlbrew/perls/skaji-relocatable-perl-5.40.0.1/lib/5.40.0/x86_64-linux/CORE -lperl -lpthread -ldl -lm -lcrypt -lutil -lc  -o ./par
2024-12-23T08:41:34,118330,PAR-Packer-1.063| /usr/bin/ld: /home/gugod/perl5/perlbrew/perls/skaji-relocatable-perl-5.40.0.1/lib/5.40.0/x86_64-linux/CORE/libperl.a(perl.o): in function `perl_construct':
2024-12-23T08:41:34,118330,PAR-Packer-1.063| /tmp/perl-build-1728287368.1/perl-5.40.0/perl.c:326:(.text+0x281b): undefined reference to `_LIB_VERSION'
2024-12-23T08:41:34,118330,PAR-Packer-1.063| collect2: error: ld returned 1 exit status
2024-12-23T08:41:34,118330,PAR-Packer-1.063| make[1]: *** [Makefile:887: par] Error 1
2024-12-23T08:41:34,118330,PAR-Packer-1.063| make[1]: Leaving directory '/home/gugod/.perl-cpm/work/1734910891.118325/PAR-Packer-1.063/myldr'
2024-12-23T08:41:34,118330,PAR-Packer-1.063| make: *** [Makefile:547: subdirs] Error 2
...

[skaji]

Thank you for the report. I will take a look at it.

[skaji]

• The issue undefined reference to _LIB_VERSION will be fixed by compiling relocatabale-perls with -Ud_libm_lib_version.
• However, even if we build relocatabale-perls with -Ud_libm_lib_version, creating executables with libperl.a would fail with relocation R_X86_64_32 against symbol PL_memory_wrap can not be used when making a PIE object; recompile with -fPIE. This is because gcc in recent OSes configured with --enable-default-pie.