[patch] Add NetBSD/hppa target

[Jeff Law]

On 6/25/19 1:57 AM, coypu@sdf.org wrote:
> On Fri, Jun 14, 2019 at 01:32:11PM -0400, John David Anglin wrote:
>>>> +hppa*-*-netbsd*)
>>>> +	target_cpu_default="MASK_PA_11|MASK_NO_SPACE_REGS"
>>> Any reason to not use the PA 2.0 ISA?   I'm virtually certain we
>>> supported the 32bit ABI running on PA 2.0 hardware in hpbsd (which is
>>> where the netbsd PA code is ultimately derived from).   I'd be really
>>> surprised if there's any PA1.1 hardware running anywhere, though there's
>>> certainly some PA2.0 hardware out in the wild.
>> You might also consider adding MASK_CALLER_COPIES as libgomp is broken for callee
>> copies.  This is an ABI choice so ideally you should do it now or not at all.
> 
> 
> Hi Jeff, Dave,
> 
> I've spoken to the authority of NetBSD/hppa (that's Nick Hudson), and he
> said he'd rather keep the ABI as it is for the purpose of upstreaming.
> He might switch ABIs eventually, but would rather do it with the local
> copy of GCC first.
> (And he has several PA1.1 machines :))
WRT PA1.1 vs PA2.0, as long as it's an informed decision (sounds like it
is), I'm not going to object.

WRT MASK_CALLER_COPIES, I concur with John, it's a now or never choice.
 Flipping it after the fact has far more impacts than libgomp --
essentially it changes who is responsible for copying structures that
are passed by invisible reference -- which happens in far more places
than libgomp.

Jeff