Android Crystax NDK wide character functions in static library

Question

I use Crystax NDK and I have 2 make files that produce a static library (libA.a) and a shared library (libB.so). Module B is dependent on module A (which is reflected by LOCAL_STATIC_LIBRARIES in B's make file).
In module A's code I have a call to swscanf and it always returns -1.

I have found weird workaround for this problem: if I add a call to swscanf somewhere in my module B's code, then swscanf starts to work fine everywhere - in module B and in module A (even though I have not changed module A's code).

My best guess is that it is a problem with linking: if I do not have wide character function invocation at the top level shared library, then linker uses default Google NDK's implementation of the function.

Please advice.