Date: Wed, 15 Jun 2016 22:23:36 +0800 From: Lei Zhang <zhanglei.april@...il.com> To: musl@...ts.openwall.com Cc: Luca Barbato <lu_zero@...too.org>, Khem Raj <raj.khem@...il.com> Subject: Re: Dynamic linker name 2016-06-15 21:00 GMT+08:00 Bobby Bingham <koorogi@...rogi.info>: > On Wed, Jun 15, 2016 at 05:39:51PM +0800, Lei Zhang wrote: >> 2016-06-15 17:31 GMT+08:00 Luca Barbato <lu_zero@...too.org>: >> > On 15/06/16 10:16, Lei Zhang wrote: >> >> i386 >> >> x86_64 >> >> powerpc >> >> powerpc64 >> >> mips >> >> mipsel >> >> mips64 >> >> mips64el >> >> >> >> which should just work out the box with my previous patch. I'll take >> >> care of x32 and ARM (subarchs and ABIs) with further patches. >> > >> > Powerpc can be little endian as well but it can wait the arm patch as well. >> >> I've only seen powerpc64le; don't know if 32-bit powerpc doesn't >> support little endian. > > There are a couple things you should know about musl's support for > powerpc64 which mean you probably shouldn't add it. > > Two different ABIs exist for powerpc64. The new one is sometimes called > powerpc64le. While it's typically used on little endian, there's no > reason it can't be used on big endian systems as well. Musl only > supports the new ABI, but supports it for both big and little endian. > The arch names used by musl for them are: I just did a quick search; are these two ABIs called "ppc64 elf" and "ppc64 elf v2" respectively? > Last I checked, clang only supported using IBM double-double for long > double on powerpc64. If this is still true, then clang cannot match > musl's ABI on powerpc64. I think powerpc64 needs no special handling anyway (unlike ARM); it just happens to be supported by the patch. OTOH, do you think I should *explicitly* disallow clang being configured against musl when targeting powerpc64? I can put that logic in my next patch if it makes sense. Thanks, Lei
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