bug#12765: "configure --disable-threads" doesn't work with coreutils-8.20

[John David Anglin]

On 4-Nov-12, at 2:48 AM, Paul Eggert wrote:

> On 11/03/2012 07:35 PM, John David Anglin wrote:
> > The attached change results in a successful build of sort.
>
> I'm afraid that won't work, because it assumes that the
> application uses both threadlib and pthread.

I don't see that it assumes that the application uses both threadlib
and pthreads.  As far as I can tell, sort doesn't use threadlib.

It uses pthreads.  Thus, a fallback is needed when pthreads
is not available.  If we are not using pthreads, we get a trivial
pthread implementation from lib/pthread.h with the change.

It seemed reasonable to base this on the configure variable
USE_POSIX_THREADS.  We could get the same result by
modifying the configure result for HAVE_PTHREAD_H, etc,
but the system does have a pthread.h header.  It's just not
usable.

Another alternative might be to convert sort to use threadlib.

Dave
--
John David Anglin       address@hidden