Date: Wed, 15 Jun 2016 07:54:42 -0700 From: Khem Raj <raj.khem@...il.com> To: Bobby Bingham <koorogi@...rogi.info> Cc: musl@...ts.openwall.com, Luca Barbato <lu_zero@...too.org> Subject: Re: Dynamic linker name On Wed, Jun 15, 2016 at 6:00 AM, Bobby Bingham <koorogi@...rogi.info> wrote: > 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: > > powerpc64 > powerpc64le > > Some software out there assumes that big endian powerpc means the old ABI. > I'm not sure if clang supports big endian powerpc64 with the new ABI or > not, but it needs to if it's to target big endian powerpc64 musl. > > The larger problem for both endians is long double support. The new ABI > calls for a 128-bit long double, either IEEE quad, or IBM double-double. > Musl will not support double-double due to the different floating point > semantics it provides, and gcc's support for IEEE quad is not fully usable > on powerpc64 yet. Therefore, musl currently uses a 64-bit long double on > powerpc64. > > 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. Thats right. I have fixed it in clang here https://github.com/kraj/clang/commit/3c3627dbd4358c8e97c95a614e63803cc9048fa6 > > Bobby
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