Re: DT_NEEDED

["H . J . Lu" <hjl at lucon dot org>]

On Fri, May 18, 2001 at 05:48:38PM +0930, amodra@one.net.au wrote:
> Hi HJ,
>   I suspect some of your recent changes to elflink.h are in violation
> of the ELF spec.  http://www.sco.com/developer/devspecs/gabi41.pdf says:
> 
> "Names in the dependency list are copies either of the DT_SONAME strings
> or the path names of the shared objects used to build the object file.
> For example, if the link editor builds an executable file using one
> shared object with a DT_SONAME entry of lib1 and another shared object
> library with the path name /usr/lib/lib2, the executable file will
> contain lib1 and /usr/lib/lib2 in its dependency list.
> 
> If a shared object name has one or more slash (/) characters anywhere in
> the name, such as /usr/lib/lib2 above or directory/file, the dynamic
> linker uses that string directly as the path name."

That brings a question. Should

# gcc -shared -o libfoo.so -L/bar -lbar

record /bar/libbar.so in DT_NEEDED? If yes, should

# gcc -shared -o libfoo.so -L../bar -lbar

record ../bar/libbar.so in DT_NEEDED? I tend to think No since -lbar
implies libbar.so without the full pathname. In that case, we just
have to make sure that we do

# gcc -shared -o libfoo.so ../bar/libbar.so

right. Any comments?


H.J.