I looked at Makefiles and can see instruction
# WARNING: do not add mode=debug or mode=release anymore in the Makefile,
# use make mode=debug all instead. By default Kamailio is compiled with
# debugging symbols in all cases (-g) and without optimization (-O0).
I do not understand how properly build Kamailio with disabled optimization.
Could you let me know how to use "mode=debug"?
Sergey