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From: waterman@cory.Berkeley.EDU.UUCP
Newsgroups: comp.sys.amiga
Subject: Re: Aztec C bug
Message-ID: <4993@zen.berkeley.edu>
Date: Thu, 19-Nov-87 05:25:24 EST
Article-I.D.: zen.4993
Posted: Thu Nov 19 05:25:24 1987
Date-Received: Sat, 21-Nov-87 14:04:35 EST
References: <532@oscvax.UUCP>
Sender: news@zen.berkeley.edu
Reply-To: waterman@cory.Berkeley.EDU.UUCP (T.S. Alan Waterman)
Distribution: na
Organization: University of California, Berkeley
Lines: 33
Keywords: C structs manx bugs
Summary: not a real bug.


 rico@oscvax.UUCP (Rico Mariani) writes:
>
> main()
> {
>	struct foo { int x; } bar;
>
>	if (bar) ;
> }
>
> compiles to:


    No. The only compiler bug here is that it didn't give you a big
flaming error message (multiple lines, ^'s and all, Mike :^).
    This is a program bug, not a compiler bug. 

    bar, being a structure, is not allowed as an argument to if().
bar cannot be zero, non-zero, or anything else. It is a label for a structure.
The only legal thing you can do here is to say:

    if (bar.x);

  What you have written really can't be said in C. C is a strange mixture
of high level and very-low level programming constructs, and as such it
can get you into some severe trouble.

   Hope this clears this one up.

	
	Happy bug-hunting !-)

	---TS