bug#20136: 25.0.50; [PATCH] Fix broken libpthread detection

[Paul Eggert]

Thanks for the bug report and suggestion.  However, it's probably better 
to keep Emacs's pthread configuration simple.  We're already bypassing 
both of Gnulib's pthread configuration strategies, so it's not too much 
of a stretch to also bypass the strategy in the Autoconf archive.  All 
these strategies are hacky and are showing signs of age (Sequent! wow! 
it's been a while) and I'm sort of hoping that FreeBSD will change its 
default to be pthread-friendly instead of pthread-hostile so that Emacs 
and other apps can stop worrying about this gorp.  So I installed the 
attached patch instead, which I tested on Fedora 21 x86-64 and on 
FreeBSD 9.1 x86-64.

> it would be nice (I imagine) to use -pthread instead
> of -lpthread if possible.

What does -pthread do that the current approach doesn't?

More generally, if we're worried only about Emacs's runtime behavior, is 
there anything wrong with compiling with the equivalent of 
-D_THREAD_SAFE -lpthread?

0001-Better-port-of-pthread-usage-to-FreeBSD.patch
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