Re: Re: musl libc for PPC64

[David Edelsohn <dje.gcc@gmail.com>]

On Mon, Feb 8, 2016 at 11:51 AM, Rich Felker <dalias@libc.org> wrote:
> On Mon, Feb 08, 2016 at 05:17:58PM +0100, Szabolcs Nagy wrote:
>> * David Edelsohn <dje.gcc@gmail.com> [2016-02-08 09:43:08 -0500]:
>> > What work is necessary to enable basic musl libc support for PPC64
>> > Linux Little Endian?
>>
>> once the abi is clear (is long double ieee128?) the arch specific
>> parts of musl need to be ported for ARCH=powerpc64.
>
> IIRC one of the powerpc64 ABIs uses function descriptors rather than
> normal function pointers. If so that may affect a few details in the
> dynamic linker and may require some changes to non-arch-specific code,
> but since we have SH/FDPIC all the basic framework for function
> descriptors should be there already.

PPC64LE Linux is little endian and does not use function descriptors.

> Also to clarify what you asked about long double ABI, if ieee128
> (quad) is not used, the compiler needs to be built to use plain double
> (ieee64 double) for long double instead of using ibm double-double.

GCC can use IEEE64 or IEEE128 for long double.

Is there any internal interest from the musl libc community for PPC64
support that IBM could sponsor with a financial bounty on
bountysource.com?

Thanks, David