[PATCH] Add ax_pthread.m4 for use in binutils-gdb

[Joshua Watt]

On Tue, 2018-04-17 at 22:50 +0100, Pedro Alves wrote:
> On 04/17/2018 06:24 PM, Joshua Watt wrote:
> > Ping? I'd really like to get this in binutils, which apparently
> > requires getting it here first.
> 
> I think it would help if you mentioned what this is and
> what is the intended use case.

Ah, that would probably be helpful! Yes, this was discussed on the
binutils mailing list, see:
https://sourceware.org/ml/binutils/2018-02/msg00260.html

In short summary: the gold linker doesn't currently build for mingw,
but only because it is attempting to link against libpthread
incorrectly on that platform. Instead of bringing in more specialized
logic to account for that, I opted to include the autotools
ax_pthread.m4 macro (this patch) that automatically handles discovering
pthreads on a wide variety of platforms and compilers, including mingw.

binutils slaves its config/ directory to GCC, so the patch is required
to be committed here first, and then it will be ported over there.

Thanks,
Joshua Watt

> 
> Was this discussed on the binutils or gdb lists?
> 
> Thanks,
> Pedro Alves