Re: [gentoo-alt] ld wrapper and cross-binutils

[Michael Weiser]

Hi Fabian,

On Sun, Apr 03, 2016 at 07:03:34PM +0200, Fabian Groffen wrote:

> I (semi intentionally) dropped cross support from the "rewrite", for it
> was too complex for me to understand.

I'm not an expert on how the Gentoo multilib/cross setup is supposed to
work. But from my work on the gcc detector patch to clang I seem to
remember that looking at /etc/env.d/*/config-* for figuring out the
installed cross toolchains is an accepted way to go about it.

> Care to share your patch so I can
> look at merging it?

It's attached. If you prefer (or the patch gets dropped by the list
manager) I can open a bug for it as well.

I really appreciate your taking the time to look at it. I regularly have
the need for arm and powerpc cross toolchains and me dabbling in 3D
printing has now added avr as well. Being able to have all that on my
MacBook natively and with the ease of crossdev would be awesome.

Micha

> On 03-04-2016 18:18:06 +0200, Michael Weiser wrote:
> > Hi again, ;)
> >
> > I'm once again looking into building cross toolchains on OS X using
> > Prefix and crossdev. Thanks to his Greg's patch to crossdev at
> > https://github.com/gmt/crossdev-prefix-compat-fixes/tree/master/portage_diffs
> > I have a much less bleak outlook on trying than last time. I haven't got
> > a working toolchain yet but want to share my experiences early so I
> > don't waste time on things that can never work.
> >
> > For now I ran into one quite basic problem: The ld wrapper from
> > binutils-config-5 does not support distinguishing between CHOST and
> > CTARGET. So after successfully installing e.g.
> > cross-arm-something-or-other/binutils it will report
> >
> > michael@osx1011:~ # arm-something-or-other-ld
> > sh: binutils-config: command not found
> > arm-something-or-other-ld: failed to locate the real ld!
> >
> > dtruss -n ld show that it's looking for
> > EPREFIX/usr/CHOST/binutils-bin/CURRENT-from-etc-env.d-bintuils-config-CHOST/arm-something-or-other-ld
> > which obviously is quite wrong.
> >
> > I've generated a patch that makes ldwrapper look at all the config-*
> > files in /etc/env.d/binutils and compare their names to the name it was
> > called with. If a match is found the name of that config is used as
> > CTARGET for constructing paths to ld which makes the above call work as
> > expected.
> >
> > Would there be any interest in adding this functionality to Prefix?
> > --
> > Micha
> > Dagegen!
> >

-- 
bye, Michael
I'm against it!