NGPT with GCOV?

I'm attempting to do some kind of code coverage analysis of the NGPT
library itself to see how much code I'm hitting with my test cases.  Has
anyone else attempted this?  The obvious idea is to try gcov, so I just
added -fprofile-arcs -ftest-coverage to the cflags in the top level
makefile.  This allowed me to see how many lines I was hitting in the
test programs that come with NGPT, but it doesn't show the code covered
in NGPT itself.  Does anyone know if it is even possible to do this with
a library, or have any other ideas for how to do this?

Thanks,
Paul Larson