1 Feb
2017
1 Feb
'17
5:54 p.m.
On Feb 1, 2017, at 5:55 PM, Noel Chiappa <jnc at
mercury.lcs.mit.edu> wrote:
Yes, GCC should do that correctly. If not, report the bug and I'll take a look at it.
Dealing with the output might be a nuisance; it generates GNU "as" compatible
text, or something that pretends to be DEC format but isn't actually. You may need
some post-processing to cast the output into the syntax that V6 "as" expects.
If you use gcc, you will also need whatever libgcc modules it happens to call on in the
generated code; minimally the mul/div routines if you ask for no-eis of course.
paul
From: William Degnan
I do not have an EIS installed. I have one
however, I can try it. I am
unsure if it's good or not, but I guess I am going to find out.
Oh yeah, without that, you're totally hosed, Unix-wise. The V6 C compiler
puts out MUL etc all over the place (e.g. for structure pointer math), so
there's absolutely no way to run vanilla V6 Unix without it.
(The GCC compiler claims to be able to compile C to machines without the
EIS; it might be an interesting hack to see if that could be used to get
V6 running on a machine without the EIS. The machine language startups
would still need work, though. And the bootstrap. :-)