man cc
/-pthread
nn

       -pthreads
           Add support for multithreading using the POSIX threads
           library.  This option sets flags for both the
           preprocessor and linker.  This option does not affect
           the thread safety of object code produced  by the
           compiler or that of libraries supplied with it.



On Mon, Feb 16, 2009 at 5:32 AM, cnav <cnav@talamasca.pl> wrote:
quoted text
> Hi,
>
> I just applied following patch:
> http://cnav.pl/clamav-configure.patch
>
> to clamav sources. And after that libclamav seems to work with pthreads.
> ldd /usr/local/lib/libclamav.so.5.4
> /usr/local/lib/libclamav.so.5.4:
>        Start    End      Type Open Ref GrpRef Name
>        084ef000 28522000 dlib 1    0   0 /usr/local/lib/libclamav.so.5.4
>        0d4b9000 2d4bd000 rlib 0    1   0
> /usr/local/lib/libclamunrar_iface.so.5.4
>        010a0000 210a5000 rlib 0    2   0 /usr/local/lib/libclamunrar.so.5.4
>        06d89000 26d8d000 rlib 0    1   0 /usr/local/lib/libbz2.so.10.4
>        091a8000 291af000 rlib 0    1   0      /usr/local/lib/libgmp.so.7.1
>        0a04b000 2a12a000 rlib 0    1   0 /usr/local/lib/libiconv.so.5.0
>        02484000 2248d000 rlib 0    1   0      /usr/lib/libpthread.so.11.0
>        05a7c000 25a84000 rlib 0    3   0      /usr/lib/libz.so.4.1
>
> Manuals says to use -pthread.
> http://www.openbsd.org/cgi-bin/man.cgi?query=pthreads&sektion=3
>
> My question are:
> What is the difference between those two libs ?
> And why with -lpthread it's working and without not?
>
> Regards,
>  Mariusz Makowski