Finding libs required by a static lib?

[Stephen Brandon]

I've got a slight problem with SndKit.

One of the libraries SndKit requires is libst.a, the "sox" backend library.

Depending on what libraries sox's ./configure finds on the system, libst.a 
will potentially link to a number of dynamic libs on the system. (eg vorbis)

When the time comes to write a GNUmakefile for a program using SndKit, each 
of these libraries needs to be listed like this:

ADDITIONAL_TOOL_LIBS += -lSndKit -lvorbis -lvorbisenc -lvorbisfile

Ideally I would like SndKit itself to be linked against these libraries, so 
they do not need to be specified in the final app's makefiles. Or, I could 
make a special makefile type that is auto-generated after getting the 
requisite info from libst.a.

The problem is that I don't know how to find out what libraries libst.a has 
needs to be linked with. I can't use ldd because libst.a is not dynamic. I 
can't use ldd against libSndKit.so.1.0.0 because though it has linked against 
libst.a, it has not linked against these extra libraries hence they are not 
listed.

All I seem to be able to do is to test link a small app and see what symbols 
are undefined, then because I know which libraries they come from I can 
manually determine which libs to link against. But that's not really 
automatible.

Can anyone advise on a way around this? Is there a tool that can do this?

Cheers,
Stephen Brandon