bug#17806: 24.4.50; Branch emacs-24 fails to beuild on Debian

[Stefan Monnier]

> I tried that benchmark (i.e., remove all *.elc files and then time 'make',
> on emacs-24 bzr 117270, Fedora 20 x86-64, GCC 4.9.0), and if I take the sum
> of user+system CPU time the version with link time optimization was 0.12%
> faster.  I don't know whether that's within the margin of error for

Definitely smaller than the margin of error, yes.  Especially if you use
multiple cores (i.e. "-jN" where N is not 1), since the work done
depends on scheduling (depending on circumstances some loads will find
a .elc file already or not).


        Stefan