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From: Bruce Momjian <[email protected]>
To: Martin Münstermann <[email protected]>
Cc: Robert Treat <[email protected]>
Cc: PostgreSQL-patches <[email protected]>
Subject: Re: [BUGS] 8.0.0beta1: -lpthread missing
Date: Fri, 13 Aug 2004 09:17:37 -0400 (EDT)
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>

Martin Münstermann wrote:
> Hi!
> 
> Martin M?nstermann wrote:
> >> OK, we now have thread compile failure reports on Debian and Slackware.
> >>
> >> The config/acx_pthread.m4 script basically tests these:
> >>
> >>     acx_pthread_flags=3D"pthreads none -Kthread -kthread lthread -pthread
> >>         -pthreads -mthreads pthread --thread-safe -mt pthread-config"
> >> =09
> >> in that order and exits once it finds the first one that can
> >> compile/link this:
> >>
> >>         AC_TRY_LINK([#include <pthread.h>],
> >>                     [pthread_t th; pthread_join(th, 0);
> >>                      pthread_attr_init(0); pthread_cleanup_push(0, 0);
> >>                      pthread_create(0,0,0,0); pthread_cleanup_pop(0); ],
> >>                     [acx_pthread_ok=3Dyes])
> >>
> >> Now, the big question is why -pthread can compile/link this successfully
> >> but -pthread isn't enough to build a library that uses threads.
> > 
> > 
> > I suspect that on Solaris, without "-lpthread" the pthread-stubs in 
> > /usr/lib/libc.so might be called at runtime instead of the functional 
> > ones in libpthread.so.
> > 
> > Could this easily be checked?
> 
> I can confirm this suspect for Solaris8/gcc 3.2.3.
> How to reproduce it:
> Add a line like
>       printf("### NOTE: check_sigpipe_handler called.\n");
> to check_sigpipe_handler() in fe-secure.c and rebuild libpq.so.
> 
> The line is only dumped out (indicating that check_sigpipe_handler() is 
> being called), when the library is linked with -lpthread.
> Without -lpthread no complains from the compiler or linker, but 
> check_sigpipe_handler() is not called, because the stub of 
> pthread_once() in libc.so does nothing.
> 
> --> We need -lpthread on solaris, too.

So the current CVS code is good?

-- 
  Bruce Momjian                        |  http://candle.pha.pa.us
  [email protected]               |  (610) 359-1001
  +  If your life is a hard drive,     |  13 Roberts Road
  +  Christ can be your backup.        |  Newtown Square, Pennsylvania 19073

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