Re: Weird result for modulus operation

[Paolo Bonzini <bonzini at gnu dot org>]

> > > > > >  Thanks for the speedy reply. But why this code:
> > > > > >
> > > > > >         int a = 17, b = 16;
> > > > > >         a = a++ % 16;
>
> Huh? Now you got me confused. Since it is an undefined behaviour, gcc is 
> free to whatever it likes.

Sure, but if you ask gcc to signal a warning, it is supposed to do so. 
:-)  It is a bug that gcc with -Wsequence-point signals a warning for "a 
= a++ % 16" but not when you use abc.a.

> Though the answer given by the first and 
> second examples show inconsistency in gcc in handling the undefined 
> behaviour.

That's not a problem.  GCC does not have to be consistent.  But both 
should be warned about.

> I can't forward to gmane.comp.gcc.devel newsgroup with my 
> account.

No problem, you can delete it.

Paolo