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List:       gmp-bugs
Subject:    Configure unable to recognize mipsisa64r2el triplets
From:       jiaxun.yang () flygoat ! com (Jiaxun Yang)
Date:       2018-03-28 14:20:38
Message-ID: 4d99ce935e97913d8a9b331285df9260ef10aede.camel () flygoat ! com
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? 2018-03-28?? 15:54 +0200?Torbj?rn Granlund???
> Jiaxun Yang <jiaxun.yang at flygoat.com> writes:
> 
>   > I've never seen "mipsisa64r2el" before.
> 
>   Yes, it's rare. However, according to config.sub from GCC [1], it's
> not
>   illegal.
> 
> Good! We woudn't want to be gaoled for a CPU moniker!
> 
>   I ran it on a LFS rootfs provided by Loongson (A Chinese MIPS64r2
>   processor).
> 
>   [1]https://github.com/gcc-mirror/gcc/blob/master/config.sub
> 
> It seems that GMP's configfsf.sub also has that.  Now, I have no idea
> what it means.  Is is just a novel name for mips64r2el or is it
> somehow
> a different ABI?

It should be a novel name of mips64r2el. I don't know if mips64r2el is
illegal but it doesn't recognize by config.sub .

> 
> If you make the obvious change to configure.ac, then build twice,
> once
> with --disable-shared and once with --disable-static, does
> 
>   make && make check
> 
> run to without any errors.  (OK, you told me you were cross
> compiling,
> so perhaps that will require some intermediary command.  And "make
> check
> TESTS=" for just building the tests would perhaps be useful.)

Yes I've tried the tests on a Loongson target system with a native
build. After use mips64* instead of mips*64* in configure and set ABI
to ABI=64. No error was reported. I'm not sure if this change will
break other MIPS systems. But since all MIPS triplets with *64*
included should support 64 o32 N32 ABIs, probably it's going to work
just fine.

> 
-- 
Jiaxun Yang <jiaxun.yang at flygoat.com>
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