is LTO aimed for large programs?

[Jan Hubicka]

> > Perhaps the question is when not to use -flto and use -fwhopr instead?
> 
> My rule of thumb is: Try -flto first, if it does not work (running out
> of memory), try -fwhopr. I think the advantage of -flto is also that it
> is better tested, while -fwhopr has known issues.

-fwhopr is quite broken in the current implementation and I am not sure
we can resoably fix it in stage3, so -flto is only choice for the moment
for larger programs. If it explodes in memory use, I would be interested
in having the testcase.

Honza
> 
> Tobias
> 
> [1] http://gcc.gnu.org/ml/gcc/2009-10/msg00122.html
> [2] http://moene.org/~toon/GCCSummit-2006.pdf