Large-Address awareness on 64 bit systems

Corinna Vinschen corinna-cygwin@cygwin.com
Mon Jun 27 08:29:00 GMT 2011


On Jun 27 02:29, Yaakov (Cygwin/X) wrote:
> On Sun, 2011-06-19 at 10:18 +0200, Corinna Vinschen wrote:
> > On Jun 19 10:09, Corinna Vinschen wrote:
> > > On Jun 19 02:24, Yaakov (Cygwin/X) wrote:
> > > > Are there any downsides to large address awareness, particularly for
> > > > 32bit systems or those with less than 4GB?  IOW is there any reason not
> > > > to switch this on by default in gcc/ld?
> > > 
> > > I don't see any problem.  Cygwin does not use the high bit of a pointer
> > > as a flag for something and hopefully no other DLL or applications does
> > > that.
> > 
> > Well, there's of course still a chance that an application or the Cygwin
> > DLL itself uses signed ints or longs to compare addresses or to do
> > adress arithmetic.  I hope there's no such problem lurking in a dark and
> > musty corner of the sources...
> 
> That would only be triggered when rebasing to the upper addresses,
> right?  My question was simply about adding 
> 
> %{!shared:--large-address-aware}
> 
> to gcc's link specs.

I think that would be the right thing to do.


Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          cygwin AT cygwin DOT com
Red Hat



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