Re: the way ld evaluates and chooses libraries

["Jeremy Monnet" <jmonnet at gmail dot com>]

Hi Nick,

Thanks for your answer.

On 10/13/06, Nick Clifton <nickc@redhat.com> wrote:
> Hi Jeremy,
>
> It sounds as though the problem you were having was because the
> .so.9.0 file was linking with libstdc++.so.5 and that this library was
> also being used to resolve all the other undefined (c++) symbols used in
> other, earlier object files and libraries.  So what you might be able to
> do is to place the libocci.so.9.0 library as the last item on the
> linker's command line and place libstdc++.so.6 before it.  That way
> libstdc++.so.6 will be used to resolve all the other c++ symbols for all
> the other object files, but because libocci.so.9.0 comes after it on the
> command line, it will not be used to resolve symbols in that library.

That explains why I don't get errors anymore when I add -lstdc++ at
the beginning of the line. The last error that comes from oracle lib
just means in the end that this version of the lib is screwed up ...

To make it short, when I try to link it fails with lot of errors. When
I add -lstdc++ et the beginning of the command line, I get only one
error with the oracle lib (which means all the other symbols were
correctly resolved)

# ldd /opt/oracle/product/9.2.0/lib/libocci.so.9.0
libstdc++.so.5 => /usr/lib/libstdc++.so.5 (0x00802000)

# gcc296 -lstdc++ -locci
/opt/oracle/product/9.2.0/lib//libocci.so: undefined reference to
`__ctype_toupper'

Well, to fix it badly, I just copied a running libocci from another
server straight on this one, and it worked (even if this is probably
not the better way to do it).

Thanks a lot for taking time to explain this !

Jeremy
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