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#### 21.1.7 Darwin

gdb provides the following commands specific to the Darwin target:

`set debug darwin` num
  When set to a non zero value, enables debugging messages specific to the Darwin support. Higher values produce more verbose output.
`show debug darwin`
  Show the current state of Darwin messages.
`set debug mach-o` num
  When set to a non zero value, enables debugging messages while gdb is reading Darwin object files. (Mach-O is the file format used on Darwin for object and executable files.) Higher values produce more verbose output. This is a command to diagnose problems internal to gdb and should not be needed in normal usage.
`show debug mach-o`
  Show the current state of Mach-O file messages.
`set mach-exceptions on`
`set mach-exceptions off`
  On Darwin, faults are first reported as a Mach exception and are then mapped to a Posix signal. Use this command to turn on trapping of Mach exceptions in the inferior. This might be sometimes useful to better understand the cause of a fault. The default is off.
`show mach-exceptions`
  Show the current state of exceptions trapping.