... The only caveat that I can think of is that one of the two (clib/newlib) is thread-safe, the other is not. That fact alone more or less forces our hand towards using one or the other. Damned if I can remember which is which.
clib2 is threadsafe when using -mcrt=clib2-ts and IIRC newlib is also threadsafe... but I can check that one (or maybe someone else knows)
but another thing that I was just thinking of... IIRC does OOo need STLport (a C++ standard library)... and that is at the moment at least only working clib2... I don't know if libstdc++ from gcc is good enough for OOo
cheers