eclass/ruby-fakegem.eclass: updated extensions dir according to formula from rubygems

[andrew-aladev]

Hello. There is an old bug 423589 about failing rdoc installation on i686 systems for ruby <= 2.6. I've reproduced it and found inconsistency between ruby fakegem and native ruby gem functionality.

Please review original extensions formula from ruby source/lib/rubygems/basic_specification.
Today ruby fakegem uses RbConfig::CONFIG['arch'] instead of Gem::Platform.local.to_s. Gem::Platform.local.to_s won't always equal to RbConfig::CONFIG['arch']. For example on i686 system:

Gem::Platform.local.to_s = 'x86-linux'
RbConfig::CONFIG['arch'] = 'i686-linux'

We can see that ruby-fakegem uses wrong i686-linux folder for extensions.

I've investigated ruby releases from v2_1 to 3_0: extensions directory formula is the same. So I am proposing to use it for ruby-fakegem eclass.

Thank you.

[gentoo-bot]

Pull Request assignment

Submitter: @andrew-aladev
Areas affected: eclasses
Packages affected: (none)

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[gentoo-repo-qa-bot]

Pull request CI report

Report generated at: 2021-12-07 18:26 UTC
Newest commit scanned: 354fd21
Status: ✅ good

There are existing issues already. Please look into the report to make sure none of them affect the packages in question:
https://qa-reports.gentoo.org/output/gentoo-ci/475a84adfd/output.html

[graaff]

Thanks for digging in to this and checking how rubygems derives the extensions dir name. I have merged this commit.

I think it's unlikely that that old bug was caused by this, but certainly it was causing issues for rdoc installation right now, e.g. https://bugs.gentoo.org/832268.