Removing LIBPTHREAD/LIBTHR build options

[John-Mark Gurney]

Kyle Evans wrote this message on Wed, Jan 20, 2021 at 20:39 -0600:
> I've staged a review to remove the LIBPTHREAD/LIBTHR build options:
> https://reviews.freebsd.org/D28263
> 
> WITHOUT_LIBTHR (and WITHOUT_LIBPTHREAD by proxy) was broken over five
> years ago, and the situation has only deteriorated since. It's hard to
> see the value in building a system without threading support entirely
> and no one has fixed it in the meantime, so I think it's time to stop
> pretending we can offer it.
> 
> Comments?

This option made sense 15-20 years ago when threading wasn't well defined
and supported..  Things have changed significantly and it's a standard and
expected interface.

IMO, it's effectively mandatory, and the option should be removed...

-- 
  John-Mark Gurney				Voice: +1 415 225 5579

     "All that I will do, has been done, All that I have, has not."