From: Joshua Kinard <kumba@gentoo.org>
To: "Michał Górny" <mgorny@gentoo.org>, gentoo-mips@lists.gentoo.org
Cc: mips@gentoo.org, multilib@gentoo.org
Subject: [gentoo-mips] Re: On MIPS using the same CHOST for all multilib ABIs
Date: Sun, 29 Dec 2013 16:40:08 -0500 [thread overview]
Message-ID: <52C096B8.1020302@gentoo.org> (raw)
In-Reply-To: <20131228235839.5bb0305a@gentoo.org>
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On 12/28/2013 5:58 PM, Michał Górny wrote:
> Hello, folks.
>
> I've noticed today that mips uses the same CHOST value for all three
> ABIs it supports:
>
> arch/mips/mips64/multilib/make.defaults:CHOST_o32="${CHOST}"
> arch/mips/mips64/multilib/make.defaults:CHOST_n32=${CHOST}
> arch/mips/mips64/multilib/make.defaults:CHOST_n64=${CHOST}
> arch/mips/mipsel/mips64el/multilib/make.defaults:CHOST_o32="${CHOST}"
> arch/mips/mipsel/mips64el/multilib/make.defaults:CHOST_n32="${CHOST}"
> arch/mips/mipsel/mips64el/multilib/make.defaults:CHOST_n64="${CHOST}"
>
> Long story short, this sucks and will cause trouble.
>
> In the multilib stuff, we're using CHOST for two purposes:
>
> 1. wrapped headers are put in /usr/include/$CHOST,
>
> 2. multilib executables are prefixed with $CHOST-.
>
> (1) here is not really a killer feature but I'd rather avoid changing
> this at this point. (2) is actually a killer feature, since the eclass
> sets CHOST properly and thanks to that AC_CHECK_TOOL and friends can
> find multilib *-config progs and stuff without any special hackery.
>
> And those are just the examples I can think of. I suspect that more stuff
> may actually expect CHOST to uniquely identify build, especially some
> tricky hidden features in autotools :).
>
> I'd suggest that you changed the CHOST values to uniquely identify ABI
> in use, at least in multilib profiles and preferably in all of them.
Matt can probably vouch for this better, but the only two ABIs affected by
this are n32 and n64. mips[el]-unknown-linux-gnu implies a 32-bit
big/little endian CHOST, which means the o32 ABI.
mips64[el]-unknown-linux-gnu means either n32 or n64. So no change should
be needed for o32-based installs.
According to this Debian wiki entry:
https://wiki.debian.org/Multiarch/Tuples
We would have to adopt mips64[el]-unknown-linux-gnuabin32 for n32 and
-gnuabin64 for n64. Testing would be needed to watch for packages that
don't have updated config.sub/config.guess files and fail to recognize this
particular CHOST.
--
Joshua Kinard
Gentoo/MIPS
kumba@gentoo.org
4096R/D25D95E3 2011-03-28
"The past tempts us, the present confuses us, the future frightens us. And
our lives slip away, moment by moment, lost in that vast, terrible in-between."
--Emperor Turhan, Centauri Republic
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next prev parent reply other threads:[~2013-12-29 21:40 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-28 22:58 [gentoo-mips] On MIPS using the same CHOST for all multilib ABIs Michał Górny
2013-12-28 23:55 ` Markos Chandras
2013-12-29 2:12 ` Mike Frysinger
[not found] ` <20131229163354.35b65df5@gentoo.org>
2013-12-29 18:21 ` Mike Frysinger
2013-12-30 9:44 ` Michał Górny
2013-12-29 21:40 ` Joshua Kinard [this message]
2013-12-29 21:48 ` [gentoo-mips] " Markos Chandras
2013-12-29 21:48 ` Michał Górny
2013-12-29 21:48 ` Markos Chandras
2013-12-29 21:52 ` Anthony G. Basile
2013-12-29 22:04 ` Michał Górny
2013-12-29 23:56 ` Mike Frysinger
2013-12-30 7:51 ` Mike Frysinger
2013-12-30 8:17 ` sébastien bertoletto
2013-12-29 22:13 ` Markos Chandras
2013-12-29 22:19 ` Anthony G. Basile
2013-12-29 22:33 ` Markos Chandras
2013-12-29 23:47 ` Anthony G. Basile
2014-01-16 20:01 ` [gentoo-mips] " Michał Górny
2014-01-16 21:05 ` Anthony G. Basile
2014-01-16 21:24 ` Michał Górny
2014-01-16 22:29 ` Anthony G. Basile
2014-01-17 4:47 ` Michał Górny
2014-01-17 18:20 ` Markos Chandras
2014-01-17 18:36 ` Matt Turner
2014-01-17 19:38 ` Markos Chandras
2014-01-17 21:57 ` Matt Turner
2014-01-17 18:51 ` Michał Górny
2014-01-17 19:44 ` Markos Chandras
2014-01-21 20:52 ` Markos Chandras
2014-01-22 14:24 ` Anthony G. Basile
2014-01-22 14:38 ` Michał Górny
2014-01-22 20:39 ` Markos Chandras
2014-01-22 21:07 ` Anthony G. Basile
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