Should be in namespace MAUS... in fact all of the tracker code should be in namespace MAUS

It's probably something like lcov seeks to link to all declared functions to do coverage - but there is a function Kalman::A which is not defined somewhere. lcov can't link to that because the declaration doesn't exist. So first time you try to use libMausCpp.so, in this case in optics exe, you get a problem.

I found out that KalmanTrack::A is a static const blah declared and defined in the header file. Should be declared in header and defined in .cc file. Why debug can't cope with this I don't know.

Edit to add - when I define the three variables in .cc file, build with debug goes fine... (trying to figure out #1060, hence playing)

Thanks Chris. I'm a bit lost though. If something is static const, then it can't be changed right? So if I say:

static const double A;

in the header, then I can't then say

A = 2./(7.*0.427);

in the constructor in the .cc? What am I missing?

Adam, check if the new revision gives you any trouble. (Removed the initialization from the header file.)

Yeah, declare in the .hh (i.e. static const double A;) define in the .cc (i.e. static const double Kalman::A = 0.;)