* Re: [gentoo-mips] Re: On MIPS using the same CHOST for all multilib ABIs
@ 2013-12-29 21:48 99% ` Markos Chandras
0 siblings, 0 replies; 1+ results
From: Markos Chandras @ 2013-12-29 21:48 UTC (permalink / raw
To: gentoo-mips
On 12/29/2013 09:40 PM, Joshua Kinard wrote:
> 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.
Why? mips64 can do o32 as well.
>
> According to this Debian wiki entry:
> https://wiki.debian.org/Multiarch/Tuples
Probably because they don't do mips64/o32. But we do, so we would also
need *-linux-gnuabi32
--
Regards,
Markos Chandras
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2013-12-28 22:58 [gentoo-mips] On MIPS using the same CHOST for all multilib ABIs Michał Górny
2013-12-29 21:40 ` [gentoo-mips] " Joshua Kinard
2013-12-29 21:48 99% ` Markos Chandras
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