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Message-ID: <20200531204205.GI31009@gate.crashing.org>
Date: Sun, 31 May 2020 15:42:05 -0500
From: Segher Boessenkool <segher@...nel.crashing.org>
To: Will Springer <skirmisher@...tonmail.com>
Cc: linuxppc-dev@...ts.ozlabs.org, libc-alpha@...rceware.org, eery@...erfox.es,
daniel@...aforge.org, musl@...ts.openwall.com, binutils@...rceware.org,
libc-dev@...ts.llvm.org
Subject: Re: ppc64le and 32-bit LE userland compatibility
On Sun, May 31, 2020 at 12:57:12AM +0000, Will Springer wrote:
> On Saturday, May 30, 2020 12:22:12 PM PDT Segher Boessenkool wrote:
> > The original sysv PowerPC supplement
> > http://refspecs.linux-foundation.org/elf/elfspec_ppc.pdf
> > supports LE as well, and most powerpcle ports use that. But, the
> > big-endian Linux ABI differs in quite a few places, and it of course
> > makes a lot better sense if powerpcle-linux follows that.
>
> Right, I should have clarified I was talking about Linux ABIs
> specifically.
That was the link you deleted.
> > What patches did you need? I regularly build >30 cross compilers (on
> > both BE and LE hosts; I haven't used 32-bit hosts for a long time, but
> > in the past those worked fine as well). I also cross-built
> > powerpcle-linux-gcc quite a few times (from powerpc64le, from powerpc64,
> > from various x86).
>
> There was just an assumption that LE == powerpc64le in libgo, spotted by
> q66 (daniel@ on the CC). I just pushed the patch to [1].
Please send GCC patches to gcc-patches@ ?
> > Almost no project that used 32-bit PowerPC in LE mode has sent patches
> > to the upstreams.
>
> Right, but I have heard concerns from at least one person familiar with
> the ppc kernel about breaking existing users of this arch-endianness
> combo, if any. It seems likely that none of those use upstream, though ^^;
So we don't care, because we *cannot* care.
> > A huge factor in having good GCC support for powerpcle-linux (or
> > anything else) is someone needs to regularly test it, and share test
> > results with us (via gcc-testresults@). Hint hint hint :-)
> >
> > That way we know it is in good shape, know when we are regressing it,
> > know there is interest in it.
>
> Once I have more of a bootstrapped userland than a barely-functional
> cross chroot, I'll get back to you on that :)
Cool! Looking forward to it.
Thanks,
Segher
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