Re: [gentoo-project] EAPI6 Features

[Michał Górny]

Dnia 2014-06-08, o godz. 16:38:43
Ulrich Mueller <ulm@g.o> napisał(a):

> >> d) Source eclasses only once
> >> Bug #422533
>
> > Does anybody still want this included?  It seems to me like the list
> > discussion was leading in a different direction, but it isn't 100%
> > clear to me if this is the case.
>
> Right, discussion has died down. Many eclasses now use a mechanism
> equivalent to the one in C header files, which seems to do the job.

I specifically did open that bug because eclasses were not using
the same way consistently. More specifically, the 'spank way' usually
involved EXPORT_FUNCTIONS being used inconsistently. As a result,
sometimes phase functions from eclass inherited last weren't actually
effective because the eclass was inherited by another eclass earlier.

Thinking about it right now, I don't think we need anything
EAPI-specific for this. A consistent policy that is respected by all
developers would be enough. I would prefer 'my way' here, that is
guarding all inherits and eclass code except for EXPORT_FUNCTIONS, so
that the repetitive inherit still overrides phase functions.

That is:

  if [[ ! ${_FOO_ECLASS} ]]; then
    inherit bar baz
  fi

  EXPORT_FUNCTIONS src_compile src_install

  if [[ ! ${_FOO_ECLASS} ]]; then
    #...

    _FOO_ECLASS=1
  fi

-- 
Best regards,
Michał Górny