Apple Mach-O Linker error – Xcode 6 Beta 6

After downloading Xcode 6 beta 6, If you are receiving Apple Mach-O Linker error, Undefined symbols for architecture then try clearing the DerivedData for Xcode.

Undefined symbols for architecture x86_64:

“__TFSs26_forceBridgeFromObjectiveCU__FTPSs9AnyObject_MQ__Q_”, referenced from:

Derived data folder location

You find out the location of derived data using Xcode Preferences. Click Xcode -> Preferences.


Click Locations tab and navigate to Derived Data section. Then click the arrow next to folder the path.


Now delete DerivedData folder under Xcode.


Useful link –

In Category: Programming, Xcode

Ravi Shankar

A polyglot software developer and now exploring Swift and iOS development. If you would like to learn from me then check out services page.

Show 2 Comments
  • Janos September 3, 2014, 4:33 am

    Very useful thank you for sharing.

  • Andreas September 6, 2014, 11:33 pm

    Thanks for sharing…saved my day

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