Glenn Morris wrote:
> Why does Emacs even have --enable-link-time-optimization as a configure
> option? Does it provide any measurable benefit?

It's supposed to have better runtime performance.  In my standard little 
benchmark, though, --enable-link-time-optimization slowed down runtime 
CPU performance by 14% (x86-64, GCC 4.9.0).  It did shrink the 
executable's text size by 2.4%, but I'd rather have the CPU performance.

I installed the attached as emacs-24 bzr 117269 to try to discourage 
casual use.  Another possibility would be to remove 
--enable-link-time-optimization, but I suppose that should be done in 
the trunk if it's done at all.  I'll CC: this to Dmitry as he added the 
option in the first place.