[csw-maintainers] Determining shared object dependencies

[James Lee]

On 23/12/09, 17:10:44, Maciej "(Matchek)" Blizinski <maciej at opencsw.org>
wrote regarding [csw-maintainers] Determining shared object dependencies:

> Let's suppose there's a shared object which depends on libstdc++.so.6.
>  I'd like to determine its dependencies.  Unfortunately,
> libstdc++.so.6 exists in more than one place in the filesystem:

> maciej at build8s [build8s]:~ > ls -l /opt/csw/{,gcc4/}lib/libstdc++.so.6
> lrwxrwxrwx   1 root     other         19 May 11  2009
> /opt/csw/gcc4/lib/libstdc++.so.6 -> libstdc++.so.6.0.10
> lrwxrwxrwx   1 root     other         20 Aug  7 11:50
> /opt/csw/lib/libstdc++.so.6 -> ./libstdc++.so.6.0.3

> How am I supposed to tell which one is the right one?

The one that was used to build it.

/opt/csw/lib/libstdc++.so.6 comes with gcc3

/opt/csw/gcc4/lib/libstdc++.so.6.0.10 come with gcc4


ldd shows which will be used and served with a side dish of -s explains
why.  The one that will be used isn't always right due to changes/bugs
in gcc4.  Compare this output from 2 different installations:


$ ldd /opt/csw/bin/aspell
        libaspell.so.15 =>       /opt/csw/lib/libaspell.so.15
        libcurses.so.1 =>        /lib/libcurses.so.1
        libdl.so.1 =>    /lib/libdl.so.1
        libstdc++.so.6 =>        /opt/csw/gcc4/lib/libstdc++.so.6
        libintl.so.3 =>  /opt/csw/lib/libintl.so.3
        libiconv.so.2 =>         /opt/csw/lib/libiconv.so.2
        libm.so.1 =>     /lib/libm.so.1
        libc.so.1 =>     /lib/libc.so.1
        libgcc_s.so.1 =>         /opt/csw/lib/libgcc_s.so.1
        libgcc_s.so.1 (GCC_4.3.0) =>     (version not found)
        libm.so.2 =>     /lib/libm.so.2
        /platform/SUNW,Sun-Blade-1000/lib/libc_psr.so.1



$ ldd /opt/csw/bin/aspell
        libaspell.so.15 =>       /opt/csw/lib/libaspell.so.15
        libcurses.so.1 =>        /usr/lib/libcurses.so.1
        libdl.so.1 =>    /usr/lib/libdl.so.1
        libstdc++.so.6 =>        /opt/csw/lib/libstdc++.so.6
        libintl.so.3 =>  /opt/csw/lib/libintl.so.3
        libiconv.so.2 =>         /opt/csw/lib/libiconv.so.2
        libm.so.1 =>     /usr/lib/libm.so.1
        libc.so.1 =>     /usr/lib/libc.so.1
        libgcc_s.so.1 =>         /opt/csw/lib/libgcc_s.so.1
        /usr/platform/SUNW,Ultra-60/lib/libc_psr.so.1


Ref: http://www.opencsw.org/bugtrack/view.php?id=4040