add custom easyblock for Term::ReadLine::Gnu Perl module

[Flamefire]

(created using eb --new-pr)

Without any of --prefix --libdir --incdir the "configure" script might pick up a system libreadline which might then fail the test with

Cannot do `initialize' in Term::ReadLine::Gnu

Neither passing additional -L parameters via LDFLAGS nor the already set LIBRARY_PATH avoided that because there is a custom search procedure adding additional -L flags to e.g. /usr/lib64 since it searches libpth set by Perl itself (determined during the core Perl module configure), see perl -V

[Flamefire]

Test report by @Flamefire

Overview of tested easyconfigs (in order)

• SUCCESS Perl-bundle-CPAN-5.36.1-GCCcore-12.3.0.eb

Build succeeded for 1 out of 1 (1 easyconfigs in total)
c68 - Linux AlmaLinux 9.4, x86_64, AMD EPYC 9334 32-Core Processor (zen4), 4 x NVIDIA NVIDIA H100, 560.35.03, Python 3.9.18
See https://gist.github.com/Flamefire/515880b8adf06feeee1aa16df4c40912 for a full test report.

[Flamefire]

Test report by @Flamefire

Overview of tested easyconfigs (in order)

• SUCCESS Perl-bundle-CPAN-5.38.2-GCCcore-13.3.0.eb

Build succeeded for 1 out of 1 (1 easyconfigs in total)
c68 - Linux AlmaLinux 9.4, x86_64, AMD EPYC 9334 32-Core Processor (zen4), 4 x NVIDIA NVIDIA H100, 560.35.03, Python 3.9.18
See https://gist.github.com/Flamefire/272a422bf8fffbf88960278763bde7d5 for a full test report.

[boegel]

@boegelbot please test @ jsc-zen3
EB_ARGS="--installpath /tmp/$USER/pr3712 Perl-5.36.0-GCCcore-12.2.0.eb Perl-bundle-CPAN-5.38.0-GCCcore-13.2.0.eb Perl-bundle-CPAN-5.40.0-GCCcore-14.2.0.eb"

[boegelbot]

@boegel: Request for testing this PR well received on jsczen3l1.int.jsc-zen3.fz-juelich.de

PR test command 'if [[ develop != 'develop' ]]; then EB_BRANCH=develop ./easybuild_develop.sh 2> /dev/null 1>&2; EB_PREFIX=/home/boegelbot/easybuild/develop source init_env_easybuild_develop.sh; fi; EB_PR=3712 EB_ARGS="--installpath /tmp/$USER/pr3712 Perl-5.36.0-GCCcore-12.2.0.eb Perl-bundle-CPAN-5.38.0-GCCcore-13.2.0.eb Perl-bundle-CPAN-5.40.0-GCCcore-14.2.0.eb" EB_REPO=easybuild-easyblocks EB_BRANCH=develop /opt/software/slurm/bin/sbatch --job-name test_PR_3712 --ntasks=8 ~/boegelbot/eb_from_pr_upload_jsc-zen3.sh' executed!

• exit code: 0
• output:

Submitted batch job 6408

Test results coming soon (I hope)...

- notification for comment with ID 2895491781 processed

Message to humans: this is just bookkeeping information for me,
it is of no use to you (unless you think I have a bug, which I don't).

[boegelbot]

Test report by @boegelbot

Overview of tested easyconfigs (in order)

• FAIL (build issue) Perl-5.36.0-GCCcore-12.2.0.eb (partial log available at https://gist.github.com/boegelbot/14b16295dd2c7c43d7021a91852d056f)
• SUCCESS Perl-bundle-CPAN-5.38.0-GCCcore-13.2.0.eb
• SUCCESS Perl-bundle-CPAN-5.40.0-GCCcore-14.2.0.eb

Build succeeded for 2 out of 3 (3 easyconfigs in total)
jsczen3c1.int.jsc-zen3.fz-juelich.de - Linux Rocky Linux 9.5, x86_64, AMD EPYC-Milan Processor (zen3), Python 3.9.21
See https://gist.github.com/boegelbot/18fdaaaf0e9dadb297de1f3ab8f772b0 for a full test report.

[boegel]

Hmm, test failure has nothing to do with this custom easyblock I think, I'll look into it...

== 2025-05-20 19:20:05,007 build_log.py:226 ERROR EasyBuild encountered an error (at easybuild/easybuild-framework/easybuild/base/exceptions.py:126 in __init__): ERROR: No default extension class set for Perl (at easybuild/easybuild-framework/easybuild/framework/easyblock.py:3181 in extensions_step)

[Flamefire]

Hmm, test failure has nothing to do with this custom easyblock I think, I'll look into it...

Can we get a backtrace of that error? Because it should be set by:
https://github.com/easybuilders/easybuild-easyblocks/blob/develop/easybuild/easyblocks/p/perl.py#L145-L146

[boegel]

The problem is introduced with the changes in easybuilders/easybuild-framework#4868, where the check for exts_defaultclass was moved up a bit earlier, before the call to prepare_for_extensions.

The custom easyblock for Perl sets exts_defaultclass via prepare_for_extensions, so that change was incorrect.

I'll open a PR to fix that regression...

[Flamefire]

FWIW: Why do we do that check there anyway? Couldn't we just fail if and only if we required that?

Imagine a bundle of extensions each having a custom easyblock and/or explicit easyblock. Why require exts_defaultclass for that?

Just remembered I actually had a PR for that already: easybuilders/easybuild-framework#4800

[boegel]

FWIW: Why do we do that check there anyway? Couldn't we just fail if and only if we required that?

Imagine a bundle of extensions each having a custom easyblock and/or explicit easyblock. Why require exts_defaultclass for that?

Just remembered I actually had a PR for that already: easybuilders/easybuild-framework#4800

I've opened easybuilders/easybuild-framework#4888 to fix the regression, since the changes in easybuilders/easybuild-framework#4800 are a lot more involved and are beyond what I still what to consider for including in the upcoming EasyBuild v5.1.0 release at this point...

[boegel]

@boegelbot please test @ jsc-zen3
EB_ARGS="--installpath /tmp/$USER/pr3712 Perl-5.36.0-GCCcore-12.2.0.eb"

[boegelbot]

@boegel: Request for testing this PR well received on jsczen3l1.int.jsc-zen3.fz-juelich.de

PR test command 'if [[ develop != 'develop' ]]; then EB_BRANCH=develop ./easybuild_develop.sh 2> /dev/null 1>&2; EB_PREFIX=/home/boegelbot/easybuild/develop source init_env_easybuild_develop.sh; fi; EB_PR=3712 EB_ARGS="--installpath /tmp/$USER/pr3712 Perl-5.36.0-GCCcore-12.2.0.eb" EB_REPO=easybuild-easyblocks EB_BRANCH=develop /opt/software/slurm/bin/sbatch --job-name test_PR_3712 --ntasks=8 ~/boegelbot/eb_from_pr_upload_jsc-zen3.sh' executed!

• exit code: 0
• output:

Submitted batch job 6411

Test results coming soon (I hope)...

- notification for comment with ID 2897143045 processed

Message to humans: this is just bookkeeping information for me,
it is of no use to you (unless you think I have a bug, which I don't).

[boegelbot]

Test report by @boegelbot

Overview of tested easyconfigs (in order)

• SUCCESS Perl-5.36.0-GCCcore-12.2.0.eb

Build succeeded for 1 out of 1 (1 easyconfigs in total)
jsczen3c2.int.jsc-zen3.fz-juelich.de - Linux Rocky Linux 9.5, x86_64, AMD EPYC-Milan Processor (zen3), Python 3.9.21
See https://gist.github.com/boegelbot/95862638c7f9a32683585ad0db836f59 for a full test report.

[boegel]

lgtm