Newsgroups: comp.os.minix
Path: utzoo!utgpu!cunews!csi.uottawa.ca!news
From: kwhite@csi.uottawa.ca (Keith White)
Subject: GNU C/386 without the 387 (diffs included)
Message-ID: <1991Apr30.224507.12294@csi.uottawa.ca>
Keywords: n
Sender: news@csi.uottawa.ca
Nntp-Posting-Host: csig
Organization: CSI Dept., University of Ottawa
Date: Tue, 30 Apr 91 22:45:07 GMT

I appear to have been successful in modifying GNU C (1.39) to not
output 387 instructions.  The compiler will compile itself and gawk
(the only programs that I've tested it with).  Incidentally, gawk
runs *considerably* faster -- none of that waiting for the floating
point emulation code to be signalled.

The patches that follow are to be fed through patch in the ./config
directory after the files in plains.nodak.edu:/pub/Minix/uk/gccdiff.tar.Z
courtesy of Alan W Black (awb@ed.ac.uk) and Richard Tobin
(richard@aiai.ed.ac.uk) without whom none of this would be possible!

PROBLEMS:
---------
You can't mix object files between the "-f80387" and "-fsoft-float"
versions.  Obvious really, since floating point numbers are returned
in different ways in the different versions.

With these mods the "-f80387" option won't work at all!  I'm not
very motivated to fix this problem since I don't actually have one of
those beasties; but it shouldn't be too difficult to fix :-) and I
will get to it eventually, maybe.

You'll need to recompile all library routines that use floating point.

Consider this alpha code, use at your own risk, standard 
disclaimers apply...

---cut here---
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end
---cut here---

...keith
-- 
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