How can I codesign gdb in OS X?

• Use the Keychain Access application to create a certificate with the following properties: self signed root, code signing, system, and always trust.
• Run the command codesign -f -s "gdb-cert" $(which gdb).

References

• https://gcc.gnu.org/onlinedocs/gnat_ugn/Codesigning-the-Debugger.html