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...is it possible to output "watch" (or log) the variable values on the lines that it picks out? Or break at that point so I can inspect the values?
@guerrian You will want valgrind --- which is just an analyzer --- to work with your debugger for breakpoints etc. Google for valgrind set breakpoint or valgrind gdb for instructions.
valgrind
valgrind set breakpoint
valgrind gdb