other/8888: Linking shared libraries with -pthread fails to link to libpthread

[Wolfgang Bangerth]

The following reply was made to PR other/8888; it has been noted by GNATS.

From: Wolfgang Bangerth <bangerth@ticam.utexas.edu>
To: Sebastian Wilhelmi <wilhelmi@ira.uka.de>
Cc: gcc-bugs@gcc.gnu.org, <gcc-gnats@gcc.gnu.org>
Subject: Re: other/8888: Linking shared libraries with -pthread fails to link
 to libpthread
Date: Tue, 10 Dec 2002 08:44:55 -0600 (CST)

 > the man page for gcc-3.2 says:
 > 
 >        -pthread
 >            Adds support for multithreading with the pthreads library.
 >            This option sets flags for both the preprocessor and linker.
 
 Sorry, I overlooked this (the gcc2.95 info pages have no documentation on 
 -pthread whatsoever). Nevertheless, it does not say specifically that it 
 links with libpthread. It might just select thread-safe variants of other 
 libraries, in case there are different versions.
 
 Though...
 
 > Also for non-shared binaries gcc does the right thing now, but not for
 > shared objects, why is that?
 
 ...this seems inconsistent. I will thus reopen the report.
 
 To workaround, you could of course just pass "-pthread -lpthread" on the 
 linker line. This is basically also what I always do.
 
 > P.S.: I have no write access to GNATS, so I could only write this
 > e-mail, or is there some way to attach that message to the bug report?
 
 As long as you CC: gcc-gnats@gcc.gnu.org, everything is fine.
 
 Regards
   Wolfgang
 
 -------------------------------------------------------------------------
 Wolfgang Bangerth              email:           bangerth@ticam.utexas.edu
                                www: http://www.ticam.utexas.edu/~bangerth