Specifying the "-pthreads" in combination with "-shared" on should cause
libpthread.so to be linked in to the shared library which is produced.
Unfortunately it does not and -lpthread has to be added to the link line 
manually.

This is very similar to bug 8888 which was exactly the same problem except for
Linux using the "-pthread" option.

-- 
           Summary: "-pthreads" option with "-shared" does not cause
                    libpthread.so to be linked in.
           Product: gcc
           Version: 3.4.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: other
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: paulg at chiark dot greenend dot org dot uk
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: sparc-sun-solaris2.8
  GCC host triplet: sparc-sun-solaris2.8
GCC target triplet: sparc-sun-solaris2.8


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18788

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