[Simh] VAX emulation issues on Raspberry Pi

[Paul Koning]

> On Jul 31, 2018, at 12:36 PM, Mark Pizzolato <Mark at infocomm.com> wrote:
> 
> ...
>> Interesting, and not too surprising.  Given that, it may be useful to use a recent
>> GCC which supports LTO -- Link Time Optimization.  That's a scheme that allows
>> whole-program optimization, rather than the normal per-sourcefile
>> optimization.
> 
> LTO was actually the default for most environments a few years back, but 
> I think that was one of the first things that broke some simulators on some 
> platforms.  It has been backed out when there were problems.

If that's still true with the latest GCC, especially with the in-development one (V9.0, from Subversion), those issues might be undefined code problems in SIMH.  It is of course also possible that they are LTO bugs, in which case finding and reporting them would be a useful thing.

	paul