Question

I need to put a breakpoint when someone changes some variable to some value.
I want to catch the exact moment this happens

Any hints please ?

thanks

Answer 1

The kneejerk reaction is to pause the program, add the watchpoint manually by typing:

watch modify -c ‘(myVar == 23)’

(or whatever condition you want to evaluate) and then allow it to continue.

You can right click on a variable in the variable list and select ‘Watch “variable name”‘ but there doesn’t seem to be a way to make that conditional.

See the LLDB Tutorial for more on the command line-style interface to debugging; in particular you’ll probably be interested in ‘Setting Watchpoints’ which is about halfway down.