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Path: utzoo!watmath!clyde!burl!ulysses!mhuxr!ihnp4!tellab1!tellab3!steve
From: steve@tellab3.UUCP (Steve Harpster)
Newsgroups: net.micro.pc
Subject: Xenix C Bug
Message-ID: <268@tellab3.UUCP>
Date: Fri, 14-Jun-85 14:21:34 EDT
Article-I.D.: tellab3.268
Posted: Fri Jun 14 14:21:34 1985
Date-Received: Sat, 15-Jun-85 09:21:51 EDT
Reply-To: steve@tellab3.UUCP (& Harpster)
Organization: Tellabs, Inc., Lisle, IL
Lines: 33

This was found by someone else here:

The C compiler under Xenix 286 (for the PC/AT) gets confused
about substrings in expressions.  It generates an assertion
error in emit.c and dies.  

The original code looked like:

	int a;
	char *x, tmp[30];

	a = (int) (&tmp[30] - x);

The fix was to use temporary variables:

	int a;
	char *x, *y, tmp[30];

	y = &tmp[30];
	a = (int) (y - x);

The reason I'm mentioning this is because the assertion
error message doesn't tell you where the problem is.
Emit.c is a routine used by the compiler which doesn't
help when you don't have source.  I hope this saves somebody
some time.

-- 


...ihnp4!tellab1!steve
Steve Harpster
Tellabs, Inc.