Re: README: ports switching to GCC 8.

["Michael L. Hitch" <mhitch%NetBSD.org@localhost>]

On Sun, 17 Nov 2019, Michael L. Hitch wrote:

> On Sun, 17 Nov 2019, matthew green wrote:
>
> > hi folks.
> >
> >
> > i've recently switched sparc* to GCC 8 and will be soon
> > switching powerpc.  just running a few more tests to
> > ensure builds should work.
> >
> > you'll probably need to do a clean build, though at least
> > tools/gcc itself will be OK.
> >
> > as always, please send-pr or email me with issues related
> > to this.
>
>  I tried to boot a sparc64 kernel that I think was built after the switch on 
> an Ultra 45, and it fails to find any disks.  I see the same problem with a 
> netbsd-9 branch kernel.  This looks very similar to PR port-sparc64/54211, 
> except that mine is an mtp controller.  That PR was after sparc64 was 
> switched to GCC 7, so my first instinct is the problem may be due to GCC 7 
> and GCC 8.  I haven't had any time to do any debugging yet, but hope to work 
> on it soon.

  OK, I was able to track down the commit that causes this failure, and it
was not obvious.  The commit was revision 1.69 of sys/dev/i2c/i2c.c.  This
resulted in attempting to configure amdtemp0 instead of gpio0.  Reverting
this change results in a working kernel - both netbsd-9 (gcc7) and
-current (gcc8).

  So far, I've only booted a new kernel.  I plan to install th whole
release on a disk to see that other things work.

Mike

---
Michael L. Hitch                        mhitch%montana.edu@localhost
Operations Consulting,  University Information Technology
Montana State University, Bozeman, MT     USA