问题现象

unable to find mach task port for process-id *** (os/kern) failure (0x5) (please check gdb is codesigned - see taskgated(8))

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文章就暂不翻译了，一步一步看，Easy for U

code-signing.txt [plain text]

On MacOSX lldb needs to be code signed. The Debug and Release builds are set to code sign using a code signing certificate named lldb_codesign.

If you don’t have one yet you will need to:

- Launch /Applications/Utilities/Keychain Access.app

• In Keychain Access select the “login” keychain in the “Keychains”

  list in the upper left hand corner of the window.

• Select the following menu item:

  Keychain Access->Certificate Assistant->Create a Certificate…

• Set the following settings

  Name = lldb_codesign

  Identity Type = Self Signed Root
  Certificate Type = Code Signing

• Click Continue

• Click Continue
• Click Done
• Click on the “My Certificates”
• Double click on your new lldb_codesign certificate

• Turn down the “Trust” disclosure triangle

  Change:

  When using this certificate: Always Trust

• Enter your login password to confirm and make it trusted

The next steps are necessary on SnowLeopard, but are probably because of a bug

how Keychain Access makes certificates.

• Option-drag the new lldb_codesign certificate from the login keychain to
  the System keychain in the Keychains pane of the main Keychain Access window
  to make a copy of this certificate in the System keychain. You’ll have to
  authorize a few more times, set it to be “Always trusted” when asked.
• Switch to the System keychain, and drag the copy of lldb_codesign you just
  made there onto the desktop.
• Switch to Terminal, and run the following:

sudo security add-trust -d -r trustRoot -p basic -p codeSign -k /Library/Keychains/System.keychain ~/Desktop/lldb_codesign.cer

• Right click on the “lldb_codesign” certificate in the “System” keychain (NOT
  “login”, but the one in “System”), and select “Delete” to delete it from
  the “System” keychain.
• Reboot
• Clean and rebuild lldb and you should be able to debug.

That should do it.

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PS

最后记得加上这一句:

sudo codesign -s lldb_codesign /usr/local/bin/gdb