Debugging threads in Xcode for iPhone

Question

When debugging in a thread created with an NSOperationQueue I can set breakpoints just fine, but actual crashes result in the thread silently dying. This is in the simulator, but it also happens on the hardware itself.

Is there a setting in Xcode (gdb, really) that will catch these?

Answer 1

I would start by adding these two lines to your ~/.gdbinit file:

fb objc_exception_throw
fb -[NSException raise]

This will pop you into the debugger and you should see the stack trace leading to the exception.