Enale -fno-fat-lto-objects by default

[Jan Hubicka]

> On 11/19/2013 02:54 PM, Jan Hubicka wrote:
> 
> >The problem is that you have .a library consisting of slim LTO objects and you link
> >with it during configure check without -flto.
> 
> On the other hand, many configure checks will never work reliably
> with -flto because they rely heavily on the fact that GCC cannot see
> across translation units and spot crass declaration/definition
> mismatches.

Hmm, you are right. Probably -fuse-linker-plugin is most sensible solution here
(though it sucks).
I wonder what people would think about enabling plugin by default for 4.9 and teaching
it to do nothing without -flto on fat objects?

Honza