Problem with XSLoader in Dumper.pm while using coverage

ovedpo15 has asked for the wisdom of the Perl Monks concerning the following question:

Hello dear monks,
I set PERL5LIB to be a path to the Devel::Cover lib direcotry.
It contains a Dumper.pm file (which is diffrent than the regaulr and I'm not sure what it for).
The tool I ran the coverage on is using Devel::Cover but for some reason it uses some other path and not the one that Devel uses. Then it fails:

Can't load '<PATH-TO-MODULE>/Data/Dumper/Dumper.so' for module Data::D
+umper: <PATH-TO-MODULE>/Data/Dumper/Dumper.so: undefined symbol: PL_h
+ints at /usr/pkgs/perl/5.26.1/lib64/5.26.1/XSLoader.pm line 96.
  at <PATH-TO-MODULE>/Data/Dumper.pm line 36.
Compilation failed in require at /nu/asa/tool.pl line 140.
[download]

Should It use the one Devel provides? If so, how can I make it use it?

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Re: Problem with XSLoader in Dumper.pm while using coverage by haukex (Archbishop) on Dec 02, 2019 at 18:11 UTC
Devel::Cover only contains a `Devel/Cover/Dumper.pm` file, but that shouldn't conflict with `Data/Dumper.pm` unless you've done something strange with the paths. Maybe you could explain the directory layout a little more? And are you sure you've pointed `PERL5LIB` to the `lib` path (the directory that contains the directory `Devel`) and not somewhere else? Or was perhaps `PERL5LIB` pointing to somewhere else before you changed it?	[reply] [d/l] [select]
Re^2: Problem with XSLoader in Dumper.pm while using coverage by ovedpo15 (Pilgrim) on Dec 05, 2019 at 09:20 UTC
PERL5LIB points to Devel lib only. I get this error only when I set DEVEL_COVER_DB_FORMAT to be JSON.	[reply]
Re^3: Problem with XSLoader in Dumper.pm while using coverage by Anonymous Monk on Dec 05, 2019 at 12:38 UTC
Post output of "perl -V"	[reply]
Re: Problem with XSLoader in Dumper.pm while using coverage by jcb (Parson) on Dec 02, 2019 at 23:18 UTC
You are mixing versions again. Your error is a failure to load an XS module due to an undefined symbol. Since the XS module that is failing to load is well-tested and widely used, we can assume that its code is probably correct and you are trying to load an XS module for one version of perl into a different version of perl, which generally does not work. `Data::Dumper` is a core module. Why is it in your custom `PERL5LIB` tree? Are you perhaps trying to run one version of perl with the libraries for a different version of perl? That does not work.	[reply] [d/l]
Re^2: Problem with XSLoader in Dumper.pm while using coverage by ovedpo15 (Pilgrim) on Dec 05, 2019 at 09:19 UTC
Thank you for the help but I don't understand why it mixes the Perl versions. This only happens when I set the env DEVEL_COVER_DB_FORMAT to be JSON.	[reply]
Re^3: Problem with XSLoader in Dumper.pm while using coverage by jcb (Parson) on Dec 05, 2019 at 23:29 UTC
It probably happens because that causes `Data::Dumper` to be loaded for some irrelevant reason. You will need to install parallel copies of `Devel::Cover` with each version of perl that your tests use. If you want to combine the databases, you will probably need to install the same version of `Devel::Cover` with each version of perl. For that matter, why do you want to combine coverage results from multiple versions of perl? I could see wanting to test code with multiple versions, but then you should strive for full coverage for each version, not full coverage across all versions.	[reply] [d/l] [select]