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From: usenet@calyx.UUCP (USENET admin)
Newsgroups: comp.lang.c
Subject: IBM RT compiler weirdness
Message-ID: <261@calyx.UUCP>
Date: Fri, 28-Aug-87 16:02:12 EDT
Article-I.D.: calyx.261
Posted: Fri Aug 28 16:02:12 1987
Date-Received: Sun, 30-Aug-87 06:50:13 EDT
Reply-To: ariel@calyx.UUCP (Ariel Glenn)
Organization: Calyx Corporation, Milwaukee, WI
Lines: 41

Keywords:missing semicolons, lint, silent!


<eat this, line-eater!>

I recently ran into a problem with an IBM RT running AIX.  I had a program
like the following:
___
#include <stdio.h>

struct junk {
	int a;
	int b;
}

main(argc,argv)
int argc;
char **argv;
{
	int i;

	for (i=0; i<argc; i++) {
		fprintf(stderr,"argv[%d] is now <%s>\n",i,argv[i]);
	}
	exit(0);
}
___
It compiled fine.  Lint said nothing.  But the output was garbage: it seems
that the missing semi-colon after the struct definition caused argc
to be given the value of argv, and argv got the value of the environment
varible pointer.
Now the kicker is that this doesn't occur *anywhere else* (NCR Tower XP
running some SYSV-ish release, uVax II under Ultrix V1.2A, various Xenix
systems we have lying around).  The program runs beautifully, even though
it shouldn't.  Lint doesn't complain on these other systems, either.

It wouldn't be so bad, but in a program of a few thousand lines, where
the original problem turned up, it's a real nuisance!  

Has anyone else had similar experiences with the RT?  Is this just IBM's
bizarrity?  Better yet, is there some way to make lint tell me about this?
_____
Ariel Glenn    {ihnp4,rutgers}!uwvax!uwmcsd1!calyx!ariel      (uucp)
                          calyx!ariel@csd1.milw.wisc.edu  (Internet)