Re: [gentoo-dev] [PATCH 2/3] virtual/cargo: drop virtual

[William Hubbs <williamh@gentoo.org>]

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On Sun, Oct 27, 2019 at 12:14:59AM +0100, Michael Everitt wrote:
> On 26/10/19 23:35, William Hubbs wrote:
> > On Sat, Oct 26, 2019 at 11:17:18AM +0200, Michał Górny wrote:
> >> On Sat, 2019-10-26 at 11:14 +0200, Dirkjan Ochtman wrote:
> >>> On Sat, Oct 26, 2019, 05:59 Kent Fredric <kentnl@gentoo.org> wrote:
> >>>
> >>>> On Fri, 25 Oct 2019 15:03:39 -0700
> >>>> Georgy Yakovlev <gyakovlev@gentoo.org> wrote:
> >>>>
> >>>>> not used anymore
> >>>>>
> >>>>> Closes: https://bugs.gentoo.org/695698
> >>>>> Signed-off-by: Georgy Yakovlev <gyakovlev@gentoo.org>
> >>>> Its likely this removal will cause the same kinds of problems faced by
> >>>> the recent virtual/pam removal, just its more insidious, as the
> >>>> dependency on the virtual is hidden away inside an eclass.
> >>>>
> >>>> But this still means that anything users have already installed will
> >>>> still depend on this, and without --changed-deps=y, it will break
> >>>> portage's resolution of anything currently installed using this crate.
> >>>>
> >>>> You can work-around this by -r1 bumping everything that used this
> >>>> eclass .... but this just goes to show why there's policy against
> >>>> eclasses changing the dependencies of their consumers without any
> >>>> consumer involvement.
> >>>>
> >>> In most if not all cases, this is just a build-time dependency. Do we
> >>> really have all these problems for build-time only dependencies?
> >>>
> >> Yes.  Because of --with-bdeps.
> > I disagree, build-time dependencies can change in place because they
> > only affect the build. The problem with virtual/pam was that it was a
> > runtime dependency as well.
> >
> > William
> The problem is that portage defaults to --with-bdeps=y, so any emerging of
> packages now triggers anything that has a build-dep change, unless, as
> previously stated, you exclude that case or change the defaults.

Sure, but rebuild changes are  exactly what you would want. that's how
software written in go gets rebuilt for example, which is exactly what
you want when go is upgraded.

I agree that some rebuilds might be unnecessary, but if you don't like
compiling/building software Gentoo isn't for you.

William


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