Re: [gentoo-dev] pkg_pretend USE validation and VALID_USE alternative

[Brian Harring <ferringb@gmail.com>]

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On Thu, Apr 01, 2010 at 12:10:20PM +0200, Gilles Dartiguelongue wrote:
> jumping on the train here, but who said PM would not feed proper data to
> pkg_pretend so it would behave like the DEPEND were already built. Could
> some guy involved in a PM development tell us about how this would be
> handled ?

Good idea, but not really viable.  The only scenario where this would 
work cleanly is in has_version checks which most of the time should be 
blockers/deps anyways.

Basically, you want the PM to lie to the ebuild in some fashion.  
Since pkg_pretend is free form, it's effectively impossible to cover 
the scenarios it could check on- consider checking the kernel 
config/version, or checking the active jvm/python version.

Some of those can sort of be handled, but it requires a lot of custom 
code (code that has to change as the tools involved change) to pull it 
off.

As said, good idea, but it was ruled out due to it being techically 
infeasible considering the gains.

~harring

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