Dear developer,
We have discovered one or more issues with your recent delivery for “xxx”. To process your delivery, the following issues must be corrected:
Non-public API usage:
The app references non-public symbols in xxx: _getcontext, _makecontext, _setcontext
If method names in your source code match the private Apple APIs listed above, altering your method names will help prevent this app from being flagged in future submissions. In addition, note that one or more of the above APIs may be located in a static library that was included with your app. If so, they must be removed.
If you think this message was sent in error and that you have only used Apple-published APIs in accordance with the guidelines, send the app’s nine-digit Apple ID, along with detailed information about why you believe the above APIs were incorrectly flagged, to appreview@apple.com. For further information, visit the Technical Support Information page.
Once these issues have been corrected, you can then redeliver the corrected binary.
Regards,
The App Store team