[gentoo-python] [PATCHES] Cleaning python_foreach_impl() up and introduce a parallel variant

["Michał Górny" <mgorny@gentoo.org>]

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Hello,

I'm sending a batch of patches (git-kind of replies to this mail).
The patches do the following:


1) clean up failure handling in python_foreach_impl().

Currently, python_foreach_impl supposedly dies if one of the functions
returns failure. This is quite unnecessary since most of the functions
called there are supposed to be fatal themselves, and may be a bit
confusing.

The idea is that:

  python_foreach_impl foo

should be as close to:

  for x in ...; do foo; done

as possible. The implicit '|| die' doesn't really look helpful since it
may hurt people with small unimportant conditionals at the end of their
functions, and may cause a few others to actually rely
on python_foreach_impl handling failures for them.

Therefore, the function is not fatal anymore. Instead, it just returns
0 for complete success or status of first failure. In any case,
the thingie called should 'die' on itself.


2) introduce a parallel variant of python_foreach_impl().

Based on the code from distutils-r1. For that reason and compatibility,
the variable controlling no of jobs is still being called
'DISTUTILS_JOBS'.

The new function is also used in distutils-r1, with the two last
patches doing pre-merge cleanup and actually using it.


3) move split log handling into python*_foreach_impl().

With the parallel build feature no longer being distutils-specific,
the split logs shall be accessible outside of it. Therefore, I have
moved their support completely to python*_foreach_impl() functions.


-- 
Best regards,
Michał Górny

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