Incorrect warning message?

Incorrect warning message?

[Denis Zaitsev]

It's an example:

void c(const char *s){}
void cc(const char **p){}
void x()
{
    char *s;
    c(s);
    cc(&s);
}

And it's the warning GCC produces for it:

bug.c: In function `x':
bug.c:7: warning: passing arg 1 of `cc' from incompatible pointer type

Is this message correct?  Doesn't the <const char> for the second
defun's declaration mean exactly the same as it means for the first -
the fact that defun doesn't modify the content of the corresponding
array?

Re: Incorrect warning message?

[Andreas Schwab]

Denis Zaitsev <zzz@anda.ru> writes:

> It's an example:
>
> void c(const char *s){}
> void cc(const char **p){}
> void x()
> {
>     char *s;
>     c(s);
>     cc(&s);
> }
>
> And it's the warning GCC produces for it:
>
> bug.c: In function `x':
> bug.c:7: warning: passing arg 1 of `cc' from incompatible pointer type
>
> Is this message correct?

Read question 11.10 of the C faq.

http://www.eskimo.com/~scs/C-faq/q11.10.html

Andreas.

-- 
Andreas Schwab, SuSE Labs, schwab@suse.de
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."

Re: Incorrect warning message?

[Denis Zaitsev]

On Sat, Jan 15, 2005 at 11:05:44PM +0100, Andreas Schwab wrote:
> Denis Zaitsev <zzz@anda.ru> writes:
> 
> > It's an example:
> >
> > void c(const char *s){}
> > void cc(const char **p){}
> > void x()
> > {
> >     char *s;
> >     c(s);
> >     cc(&s);
> > }
> >
> > And it's the warning GCC produces for it:
> >
> > bug.c: In function `x':
> > bug.c:7: warning: passing arg 1 of `cc' from incompatible pointer type
> >
> > Is this message correct?
> 
> Read question 11.10 of the C faq.
> 
> http://www.eskimo.com/~scs/C-faq/q11.10.html

Thanks.  It's interesting.  :)

Re: Incorrect warning message?

[Joe Buck]

On Sun, Jan 16, 2005 at 03:32:42AM +0500, Denis Zaitsev wrote:
> On Sat, Jan 15, 2005 at 11:05:44PM +0100, Andreas Schwab wrote:
> > Read question 11.10 of the C faq.
> > 
> > http://www.eskimo.com/~scs/C-faq/q11.10.html
> 
> Thanks.  It's interesting.  :)

That FAQ answer is poor.  You can find the real reason in the answer
to question 1 in

http://www.jamesd.demon.co.uk/csc/faq.html#PartC

(this is for C++ but the reasoning applies to C as well).

Re: Incorrect warning message?

[Denis Zaitsev]

On Mon, Jan 17, 2005 at 08:48:59AM -0800, Joe Buck wrote:
> On Sun, Jan 16, 2005 at 03:32:42AM +0500, Denis Zaitsev wrote:
> > On Sat, Jan 15, 2005 at 11:05:44PM +0100, Andreas Schwab wrote:
> > > Read question 11.10 of the C faq.
> > > 
> > > http://www.eskimo.com/~scs/C-faq/q11.10.html
> > 
> > Thanks.  It's interesting.  :)
> 
> That FAQ answer is poor.  You can find the real reason in the answer
> to question 1 in
> 
> http://www.jamesd.demon.co.uk/csc/faq.html#PartC
> 
> (this is for C++ but the reasoning applies to C as well).

Thanks.  Good explanation.