* Re: [gentoo-mips] Re: On MIPS using the same CHOST for all multilib ABIs
@ 2013-12-29 21:52 99% ` Anthony G. Basile
0 siblings, 0 replies; 1+ results
From: Anthony G. Basile @ 2013-12-29 21:52 UTC (permalink / raw
To: gentoo-mips
On 12/29/2013 04:48 PM, Markos Chandras wrote:
> On 12/29/2013 09:48 PM, Michał Górny wrote:
>> Dnia 2013-12-29, o godz. 16:40:08
>> Joshua Kinard <kumba@gentoo.org> napisał(a):
>>
>>> On 12/28/2013 5:58 PM, Michał Górny wrote:
>>>> 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}"
>>>>
>>>> [...]
>>>
>>> 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.
>>
>> Just to be clear:
>>
>> profiles/arch/mips/mipsel/mips64el/multilib/make.defaults:
>>
>> CHOST="mips64el-unknown-linux-gnu"
>>
>> [...]
>>
>> CFLAGS_o32="-mabi=32"
>> CHOST_o32="${CHOST}"
>>
>> CFLAGS_n32="-mabi=n32"
>> CHOST_n32="${CHOST}"
>>
>> CFLAGS_n64="-mabi=64"
>> CHOST_n64="${CHOST}"
>>
>> So in this case, o32 actually uses mips64el-unknown-linux-gnu, unless
>> I'm missing something.
>>
>
> Yes all 3 ABIs use the same tuple.
>
I think people are missing Mike's point from earlier, which is that
tuples label toolchains and a toolchain can support multiple abis. So
for example, what would one do on a system which simultaneously has o32,
n32 and n64? -gnuabi32n32n64 looks pretty crazy.
--
Anthony G. Basile, Ph. D.
Chair of Information Technology
D'Youville College
Buffalo, NY 14201
(716) 829-8197
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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 ` Michał Górny
2013-12-29 21:48 ` Markos Chandras
2013-12-29 21:52 99% ` Anthony G. Basile
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