You're trying to link an object (.o) file against a library. You should do that with the shared-object file (.so).
For example I use this commandline to link some of my XS code against a shared library.
cc -shared -L/usr/local/lib xs/Connection.o xs/Loudmouth.o xs/Message
+.o \
xs/MessageHandler.o xs/MessageNode.o xs/Proxy.o xs/SSL.o perlmouth.o \
build/perlmouth-gtypes.o -o blib/arch/auto/Net/Jabber/Loudmouth/Loudm
+outh.so \
-lloudmouth-1 -lglib-2.0 -lgobject-2.0 -lgthread-2.0
This works pretty well.
Another possibility would be to link the libmyprint object file (.o) together with helloworld.o into helloworld.so.
Cheers, Flo
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