perl PortGroup: add support for multiple Perl versions

[mojca (Mojca Miklavec)]

Perl recently switched to +perl5_16. Now there's a lot of ports with hardcoded dependencies on Perl 5.12. It would be nice to remove those and use variants instead (similar to what is done for python, even though the situation is a tiny bit different there).

Related tickets:

• #43004
• #43191
• #43191

From ​intltool:

# TODO: This perlver cruft should be done in the perl5 PortGroup
if {[variant_isset perl5_8]} {
    set perlver 5.8
} elseif {[variant_isset perl5_10]} {
    set perlver 5.10
} elseif {[variant_isset perl5_12]} {
    set perlver 5.12
} elseif {[variant_isset perl5_14]} {
    set perlver 5.14
} elseif {[variant_isset perl5_18]} {
    set perlver 5.18
} else {
    set perlver 5.16
    default_variants +perl5_16
}

variant perl5_8 conflicts perl5_10 perl5_12 perl5_14 perl5_16 perl5_18 description {use perl 5.8} {}
variant perl5_10 conflicts perl5_8 perl5_12 perl5_14 perl5_16 perl5_18 description {use perl 5.10} {}
variant perl5_12 conflicts perl5_8 perl5_10 perl5_14 perl5_16 perl5_18 description {use perl 5.12} {}
variant perl5_14 conflicts perl5_8 perl5_10 perl5_12 perl5_16 perl5_18 description {use perl 5.14} {}
variant perl5_16 conflicts perl5_8 perl5_10 perl5_12 perl5_14 perl5_18 description {use perl 5.16} {}
variant perl5_18 conflicts perl5_8 perl5_10 perl5_12 perl5_14 perl5_16 description {use perl 5.18} {}

[mojca (Mojca Miklavec)]

And here's a ticket I opened a while ago requesting different Python variants: #40734

[jul_bsd@…]

same problem w rrdtool #42498 but was not even linked to a defined perl version

[cooljeanius (Eric Gallager)]

Cc Me!

[mojca (Mojca Miklavec)]

See also #44405.

[mf2k (Frank Schima)]

Cc Me!

[pixilla (Bradley Giesbrecht)]

Add variant creation to perl5 port group.

[pixilla (Bradley Giesbrecht)]

Git Portfile example of using perl5 port group variant creation.

[pixilla (Bradley Giesbrecht)]

I believe r125264 addresses this tickets issue.

[mojca (Mojca Miklavec)]

Thank you very much. (Next time when you upload patches please drop a note, otherwise nobody notices the uploads.)

Did you already change any of the perl modules/programs using these patches?

[pixilla (Bradley Giesbrecht)]

Replying to mojca@…:

Thank you very much. (Next time when you upload patches please drop a note, otherwise nobody notices the uploads.)

I was not aware and surprised no one commented on the patches.

Did you already change any of the perl modules/programs using these patches?

Locally yes. I have another option to add to the port group to "require" one of the available perl variants. I try to get this in tonight or tomorrow.

[pixilla (Bradley Giesbrecht)]

See r126932 for perl5.create_variants usage example.