[PATCH] [libc++] Allow libc++ to be built on systems without POSIX threads

[Jonathan Roelofs]

On 8/29/14, 10:59 AM, Dan Albert wrote:
> I'm a little bit worried about the no-threads build bit-rotting (if any of us
> forget to wrap something in #ifndef _LIBCPP_HAS_NO_THREADS).
I'm a bit worried about that too, but I am willing to maintain it.

> Should we have a buildbot set up to build this configuration?
I would appreciate having one, but I can't host it at the moment.

At some point I would like to host a baremetal buildbot (targeting either QEMU, 
a raspberry pi, or some beagleboard), but I'm not quite ready for that... we 
need to work out the details of remote testing in lit before that is practical.

> Would it be possible to define noop  implementations of all the things
> you've ifdef'd  out so that we don't have to worry about that?
 > It's possible that would make things more or a mess, but I'm not sure.
I think that nop-shims have an even higher potential for bit-rot than these 
#ifdef's.

I originally attempted writing no-op shims for a few of them, but there were 
several where it didn't seem possible, and others where the shims were pretty hairy.


Jon
>
> ================
> Comment at: src/condition_variable.cpp:19
> @@ -14,2 +18,3 @@
>
> +
>   _LIBCPP_BEGIN_NAMESPACE_STD
> ----------------
> nit
>
> http://reviews.llvm.org/D3969
>
>

-- 
Jon Roelofs
jonathan at codesourcery.com
CodeSourcery / Mentor Embedded