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 . 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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