From: Jon Forums <lists@...>
Date: 2012-11-26T08:32:14+09:00
Subject: Re: How to create a gem which conditionally compiles/installs a C extension?

>> I recently had a similar idea (comined pure-ruby and native gem with
>> build decision made at install time by extconf.rb) and briefly toyed
>> with wrapping the extconf.rb with a Rakefile. The quick hack didn't
>> work, and I haven't had time to swing back and dance with the little
>> monster.
>>
>>   https://github.com/jonforums/ffi-bogus
>>
>> Perhaps it just needs another set of eyes and a bit more time. That
>> said, a Rakefile + extconf.rb solution is a kludge. The right solution
>> is to find a clever way to make RubyGems more nimble and not break
>> existing extconf.rb builds.
>
> Agreed.
>
> I couldn't see how to make it work either. So until something better
> comes along I've gone with the bogus C extension approach when it is not
> needed.
>
> See https://github.com/rocky/rb-threadframe/tree/master/ext


When you get a moment would you try replacing

https://github.com/rubygems/rubygems/blob/master/lib/rubygems/ext/builder.rb#L15-L17

with this little hack

  return unless File.exist? 'Makefile'

and try your idea of not creating a Makefile from extconf.rb upon
certain conditions.

It assumes (a) all sucessful exits from extconf.rb (with or without
generating a Makefile) is what the author intended, and (b) all
extconf.rb failures will be handled as-is by RG.

When I get time I'll test on both my Win7 and Arch systems. If it turns
out to be this easy *and* solid, well...

Jon

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