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From: CBFalconer <cbfalconer AT yahoo DOT com>
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Newsgroups: comp.os.msdos.djgpp
Subject: Re: g++ Warnings
References: <Pine DOT GSO DOT 4 DOT 44 DOT 0203300924240 DOT 24668-100000 AT hummel DOT orchestra DOT cse DOT unsw DOT EDU DOT AU> <2561-Sat30Mar2002112257+0300-eliz AT is DOT elta DOT co DOT il>
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Date: Sat, 30 Mar 2002 11:53:11 GMT
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Eli Zaretskii wrote:
> 
> > From: Dong Soo Kim <dsk666 AT cse DOT unsw DOT EDU DOT AU>
> > Newsgroups: comp.os.msdos.djgpp
> > Date: Sat, 30 Mar 2002 09:28:45 +1100
> >
> > I was just reading Stroustrup's book on C++ (3rd ed) and in it he says
> > that "int x=x;" should produce a warning in good compilers.
> >
> > Then to my surprise I found that g++ doesn't (both in MingW and Djgpp),
> > and silently ignores it.
> 
> It would be a very Bad Idea (tm) for GCC to flag those cases, since
> they are widely used to shut up compiler warnings about variables
> which the compiler things are used before they are initialized.
> (Compilers can err about this because they don't understand what
> range of values can certain variables have, and thus don't know what
> conditions could fire under what circumstances.)

I find it is quite easy to slightly recast the routines just to
make things 'perfectly clear' to the compiler.  That way the
warning will come up if I make some foolish future revisions.  If
I can't do this the code was overly complex to begin with.

-- 
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