4 Nov
2018
4 Nov
'18
3:50 a.m.
One thing that was supported on PCC for many years was the ability to
generate GE/Honeywell 6-bit character constants, using the back quote
(`) character. I remember trying it in the late 80's on a shipping
Sun machine and seeing that it was still present in the grammar, and,
as nearly as I could remember, still produced the correct answer.
Steve
----- Original Message -----
From: "Lars Brinkhoff" <lars(a)nocrew.org>
To:"Warner Losh" <imp(a)bsdimp.com>
Cc:"Steve Johnson" <scj(a)yaccman.com>, "The Eunuchs Hysterical
Society"
<tuhs(a)tuhs.org>
Sent:Tue, 30 Oct 2018 08:16:17 +0000
Subject:Re: [TUHS] Archaic yacc C grammar
Warner Losh wrote:
Steve Johnson wrote:
We actually had a pretty good system for making changes like
that. First, we would change the compiler to accept both the old
and
the new. Then we would produce a warning that on a
particular date
the old would no longer work. Then we made the old an error and
printed a message about how to fix it.
How long a transition period did you typically have?
I heard the V7 compiler still supports old B style initialization
"int x 42;". So in some cases, a really long time.