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Path: utzoo!linus!philabs!cmcl2!seismo!umcp-cs!cvl!dno
From: dno@cvl.UUCP (David Oskard)
Newsgroups: net.unix-wizards
Subject: Sun C compiler bug
Message-ID: <666@cvl.UUCP>
Date: Fri, 26-Jul-85 12:34:04 EDT
Article-I.D.: cvl.666
Posted: Fri Jul 26 12:34:04 1985
Date-Received: Sun, 28-Jul-85 08:08:54 EDT
Distribution: net
Organization: Computer Vision Lab, U. of Maryland, College Park
Lines: 25

[Eat my line!]

	On our Sun, the following C code gives an "illegal address"
error:
			if (*bp++) 
				...
where bp is     float  *bp =  SOMEARRAY[WHATEVER];

It has something to do with the evaluation of the conditional
expression (it works fine in regular expressions).  I haven't tried
to reproduce it with other variable types, but it may or may not be
type independent.  Has anybody out there fixed this bug?  Replies would
be greatly appreciated.  Please respond by mail.  I'll post the results.

Incidentally,  the bug can be avoided by doing

	if (*bp) { .... }  bp++;


					David Oskard
					seismo!rlgvax!cvl!dno
					dno@cvl.arpa

					University of Maryland
					Center For Automation Research