Re: svr4, again

[Jason Thorpe <thorpej%me.com@localhost>]

> On Dec 19, 2018, at 1:48 PM, Johnny Billquist <bqt%softjar.se@localhost> wrote:
> 
> Unless I remember wrong, it's needed for Ultrix compatibility on VAX (and maybe MIPS?).

Ultrix compatibility is handled with COMPAT_ULTRIX, which is more or less vanilla 4.3BSD, with a few extra random things.  It, like COMPAT_SUNOS, is a pretty thin layer, but also of questionable utility these days.

Same goes for COMPAT_OSF1 (for Digital Unix on Alpha) ... a thicker layer than COMPAT_ULTRIX, but not nearly as thick as COMPAT_SVR4 or COMPAT_IBCS2.  COMPAT_OSF1 was never really fully implemented ... a bunch of stuff worked, but none of the Mach traps or Mach IPC were ever emulated.

Outreach on those specific port mailing lists (port-pmax, port-vax, port-alpha, port-sparc*) to determine "how useful is this these days?" is probably warranted.

-- thorpej