Re: "strict" weak aliases

[David Young <dyoung%pobox.com@localhost>]

On Sun, Jul 24, 2011 at 11:26:13PM +1000, matthew green wrote:
> 
> > Sometimes it is important that the type of an object matches the
> > type of its weak alias.  See the attached patch that both adds a
> > type-safe __weak_alias() called __strict_weak_alias(), and fixes a buggy
> > __weak_alias() that __strict_weak_alias() would have caught during
> > compilation.
> > 
> > Thanks to Taylor R. Campbell for the incantation that was key
> > to making this work,
> > 
> > __unused static typeof(alias) *__weak_alias_##alias = &sym;
> > 
> > Does this look ok to commit?
> 
> could you bring this up on tech-toolchain?  i think it would be useful
> for userland as well.

Ok, bringing it up. :-)

> one thing -- please change it to use __typeof__.  (we should change
> to using this everywhere we use typeof today.  not your problem :)

Sure.  Is it __typeof__() or __typeof(), though?  I'm told that
__typeof__() is in the GCC manual, however, NetBSD uses __typeof() at
least once:

sys/dirent.h:#define _DIRENT_NAMEOFF(dp) __builtin_offsetof(__typeof(*dp), 
d_name)

Dave

-- 
David Young             OJC Technologies
dyoung%ojctech.com@localhost      Urbana, IL * (217) 344-0444 x24