Re: [gentoo-alt] Names of Prefix variants

[Ruud Koolen]

On Tuesday 29 October 2013 08:40:59 Michael Haubenwallner wrote:
> On 10/26/13 00:54, Ruud Koolen wrote:
> > It's bikeshedding time.
> >
> > The RAP project (prefix with libc) is now ready to start getting merged
> >
> > I propose "prefix-native" for rap as an alternative. Does anyone have any
> > good ideas for classic prefix?
>
> As you say "prefix with libc" above: Is it necessary to /split/ Prefix into
> $rap and $classic, or would it also fit to have $rap to /supplement/
> classic?

In what sense? On the profile level, we factor out the common base shared 
between classic and rap (which is about 50%-75% of the existing profile), and 
have both variants inherit this base (neither can inherit the other 
directly). As for USE flags, the primary function of the new use flags is to 
disable certain hacks in rap. Writing those as `if use prefix && ! use 
prefix-libc` is not a nice situation, so we need both new flags.

We keep USE=prefix, of course. The vast majority of cases of prefix support in 
ebuilds applies equally to classic and rap; those will keep using `if use 
prefix`. The new flags are solely for the handful of ebuilds that need to 
distinguish between the variants.

> In case of the latter, I could think of:
>
> profiles/base/make.defaults:
>  USE_EXPAND_UNPREFIXED+=" PREFIX" # for backwards compat, or we get
> "prefix_prefix" USE_EXPAND_HIDDEN+=" PREFIX"
>  USE_EXPAND_IMPLICIT+=" PREFIX"
>  USE_EXPAND_VALUES_PREFIX="prefix prefix-libc"
> And to help bug#473598 eventually:
>  USE_EXPAND_VALUES_PREFIX+=" ${USE_EXPAND_VALUES_ARCH//*-*}" # the
> base-archs only

I don't think I understand this.

> To distinguish between glibc/uclibc/etc, existing ELIBC could do.

Yeah, that's fine.

> For the profiles itself:
>  profiles/default/linux/$arch/13.0/prefix and
>  profiles/default/linux/$arch/13.0/prefix/glibc
>  profiles/default/linux/$arch/13.0/prefix/uclibc
> or even
>  profiles/default/linux/$arch/13.0/prefix and
>  profiles/default/linux/$arch/13.0/prefix/libc/glibc
>  profiles/default/linux/$arch/13.0/prefix/libc/uclibc

Which variant will be considered the default and thus get the glorious 
profiles/default/linux/$arch/13.0/prefix name is a mostly unrelated matter. 

-- Ruud