Up: Mac OS Topics
The Darwin Kernel requires the debugger to have special permissions before it is allowed to control other processes. These permissions are granted by codesigning the GDB executable. Without these permissions, the debugger will report error messages such as:
Starting program: /x/y/foo Unable to find Mach task port for process-id 28885: (os/kern) failure (0x5). (please check gdb is codesigned - see taskgated(8))
Codesigning requires a certificate. The following procedure explains how to create one:
Once a certificate has been created, the debugger can be codesigned as follow. In a Terminal, run the following command...
codesign -f -s "gdb-cert" <gnat_install_prefix>/bin/gdb
... where "gdb-cert" should be replaced by the actual certificate name chosen above, and <gnat_install_prefix> should be replaced by the location where you installed GNAT.