Lock annotations: enable them for libpthread, libstdthreads

[Steve Kargl]

On Thu, Aug 28, 2014 at 07:02:55PM +0200, Ed Schouten wrote:
> 
> small number of patches to build with this flag, I am also going to
> add -Wthread-safety to WARNS=6, to make sure it won't regress. I'm
> also planning on MFC'ing at least the changes to <sys/cdefs.h>, so it
> is at least possible to write portable code.


What it is the performance penalty (time and memory)?  That is,
buildworld already takes a looooonnnnng time on my system because
of clang. 

-- 
Steve