gcc-vax in NetBSD-9.0: help needed to test patches

[Kalvis Duckmanton <kalvisd%gmail.com@localhost>]

Hi,

I've been working on fixing some of the problems in GCC 7's Vax back end 
in NetBSD 9.0 - adding support for c++ exceptions, fixing illegal 
instruction faults when compiling with -O2, that sort of thing.  This 
work is emphatically not to convert the Vax backend to MODE_CC but I'm 
hoping that it will help that effort by providing a working base to 
start from.

Testing so far has been to compile the source fragments from the PRs, 
cross-compile the entire NetBSD 9.0 release at -O2 and boot the 
resulting kernel, cross-compile gdb 8, compile gdb 6.6 natively, compile 
bash 3.2 natively and to compile tcsh 6.0.22 natively. Using John Klos's 
SimH images, pkgsrc has been bootstrapped using the amended GCC, and 
pkgsrc is working its way through Perl 5.30.2 with some success.

John has kindly offered to host the set of 10 patches (thanks John!) and 
they can be found at https://ftp.netbsd.org/pub/NetBSD/misc/jklos/vax/

I'd very much appreciate it if someone (or many someones) could try the 
changes out please.  I'm more than happy to give further details of what 
each one is supposed to be fixing.

To apply them, extract vax_gcc_patches.tar.gz somewhere convenient, move 
*.patch and patch.sh to the root of the NetBSD source tree, then run 
patch.sh

Many thanks

kalvis