Re: UNS: Compiling vax kernel with pcc

[Anders Magnusson <ragge%ludd.ltu.se@localhost>]

On 07/28/2011 02:49 PM, Brad Parker wrote:
> > No fancy addressing modes are implemented yet, so the kernel became 
> > unneccessary large,
> > about 20% bigger than a gcc compiled kernel.  This will be added later.
> If this is something mere mortals can reproduce?   If so, I'd enjoy 
> trying it out.
Yep, no problem.  Just fetch the current source, see 
http://pcc.ludd.ltu.se/downloads/ for details.

If you are running on a vax just compile the kernel with CC=pcc, if 
you're cross-compiling
then you need to fix the cross-build environment in some way.
> I regularly boot netbsd/vax for 11/7xx using the simh simulator.  It's 
> easy to set up.  Once it
> works I copy my image to a scsi disk and boot on a real live 11/730.
>
> My assumption (perhaps incorrect) is that once pcc is up to speed it 
> might well generate better
> code for the vax than gcc does, with less cpu and memory.
Well, I wouldn't be sure of that, but there are a bunch of optimizations 
that still can be
added to pcc for vax.

-- Ragge