modular Xorg and pthreads

["Blair Sadewitz" <blair.sadewitz%gmail.com@localhost>]

For AIGLX support, various libraries have to have access to pthread
functions.  I was told in the past that we have thread stubs in libc,
but the libX11 configure script does not find pthread_self  there.  I
can set XTHREAD_CFLAGS and XTHREADLIB (in libX11's configure script)
to -pthread, but then tons of programs and libraries that don't need
it pick up a pthread dependency that they don't need.

What is the proper way to handle this?  Am I missing something?  In
modular Xorg head/master, the netbsd*) case defines
_POSIX_THREAD_SAFE_FUNCTIONS and -lpthread as the cflags and
xthreadlib. This doesn't seem right in pkgsrc, as our xproto is
patched because NetBSD doesn't provide _POSIX_THREAD_SAFE_FUNCTIONS.

If someone could clue me in, I'd appreciate it.

--Blair

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