Linking only required objects

I try to link only required objects into my executable but I
dont know 
which objects are required so I add lots of
-l<library> to my linker 
stage (using gnu ld). My program is linked and runs. Fine.
But checking 
with ldd I see that it now depends on all these libraries,
some of them 
I am sure are not required.

How do I find out which libraries are required and which are
not required?

Using Linux...

Bernhard
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