Re: unused for all platforms

[Miroslaw Dobrzanski-Neumann <mne mosaic-ag com>]

On Mon, Feb 18, 2002 at 03:10:14PM +0100, Daniel Egger wrote:
> Am Mon, 2002-02-18 um 09.49 schrieb Miroslaw Dobrzanski-Neumann:
> 
> > As I know there is no compiler that generates code for statements like
> > "p = *&p"
> 
> Actually that would have to be "p = p" which is valid C and means
> what it reads (i.e. Initialise p with the value it had before, whatever
> that was; probably random).There was some hefty discussion on the gcc
> mailinglist whether that really is the proper fix to prevent the
> "variable blah might be used uninitialised" warnings and the only
> conclusion they have reached was that it's totally valid C but should
> be discouraged.
why?
p = *&p guarantees that p does not go into cpu register (its address is
taken).
We use this construct as DO_NOT_CLOBBER(p) when using DCE exceptions.

> Better would be to use the special attributes of gcc or pragmas of
> other compilers to hint the compiler into the right direction. Of course
> avoiding unused parameters would be the best idea after all.
which ends in many #ifdef/#pragma parts which not necessary improve the
readability of code.

BTW.
What about implementing exception handling in terms of setjmp/longjmp like DCE
does?
-- 
Miroslaw Dobrzanski-Neumann

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