On Mon, Dec 06, 2004 at 12:53:52PM -0500, Bruce Momjian wrote:
> Brad Nicholson wrote:
> > >OK, I assume you used --enable-thread-safety in configure.
> > >
> > Correct.
> >
> > >This should
> > >have added some PTHREAD link flags to your libpq build, and those
> > >settings should have followed the libpq library into your pg_ctl link
> > >line.
> > >
> > >Would you look in your Makefile.global for PTHREAD_* settings and report
> > >those. The second question is why saying those libraries are needed by
> > >libpq is not passing down to uses of libpq, like in pg_ctl.
> > >
> > >
> >
> > PTHREAD_CFLAGS = -pthread -D_REENTRANT -D_THREAD_SAFE
> > -D_POSIX_PTHREAD_SEMANTICS
> > PTHREAD_LIBS = -lpthread -lpthreads
>
> OK, great. Can I see the link line that creates libpq? It should contain
> the PTHREAD_LIBS flags.
>
> If it does, the next question is why AIX doesn't pass those flags.
>
> Oh, I think I see the cause. I now remember from
> config/acx_pthread.m4:
>
> # More AIX lossage: must compile with cc_r
> AC_CHECK_PROG(PTHREAD_CC, cc_r, cc_r, ${CC})
>
> Seems AIX wants a special _compiler_ to be used whenever threading is
> involved, even by a linked-in library. I didn't implement using
> PTHREAD_CC because there was just too much code disruption for threading
> on one platform. I wonder if we should just disable threading on AIX.
>
> Let me ask --- if you change the CC line in Makefile.global to cc_r,
> does everything build OK? That might be a clean solution because the
> change could be made in one place. Of course this would mean the
> backend would also be compiled using cc_r and I have no idea of the
> effect.
>
> Of course, the idea that any use of libpq has to use cc_r is going to
> make building things complex without some adjustments.
>
> Also, what version of AIX are you using? Are other AIX folks having
> thread build problems?
>
We have until very recently supporting a number of applications
requiring threading on AIX 3/4/5. They always required much more
understanding of the entire compile/link/run cycle than any other
platform we use. Changing the CC line to cc_r works fine with the
only problem being the cascaded use of cc_r into any application
that links against libpq. Even with these complications, I think
we should still allow threading on AIX. Anyone who builds software
on AIX already knows how to manage these issues.
Ken
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