I have the same problem.

On OS X 10.11, you'll need to run sudo /usr/libexec/xpccachectl, then reboot. On macOS Sierra, they should be loaded by default. Please reopen if you don't see the menu item.

That didn't help :(

Didn't help.

I had the same problem, did run sudo /usr/libexec/xpccachectl and restarted twice, still the same.

What finally did the trick:

In the Xcode project select the clang-format (the extension) target and then edit the scheme ( Product > Scheme > Edit Scheme ... ). In the Info tab of the Run settings set Xcode as the Executable. (By choosing Other... you can browse for the Xcode application on your file system).

Then, when you press the build and run button, a new Xcode application will start up. (After a short while its icon will turn black) The menu item will be available in that Xcode app.

After closing this Xcode and restarting the Xcode you were running before, the normal (blue icon) Xcode will have the clang-format entry in the Editor menu as well.

@jehnes "In the Xcode project select the clang-format", what project are you referring to?

I meant the XcodeClangFormat project, the project this discussion is about. You can download it from github. It has two targets, one is an executable that when run lets you select a style or custom .clang-format file, the other is the extension. It is called clang-format. This is the target for which you may have to edit the Scheme.

I have same problem. And still not fixed after run sudo /usr/libexec/xpccachectl and reboot my macbook. Also try restart xcode, plugin several times.

OSX: 10.11.6 (15G1004)
Xcode: 8.0 (8A218a)

I got this error in console, not sure if it's related.

9/21/2559 BE 13:22:50.216 taskgated[331]: no application identifier provided, can't use provisioning profiles [pid=1533]
9/21/2559 BE 13:22:51.636 lsd[324]: LaunchServices: Could not store lsd-identifiers file at /private/var/db/lsd/com.apple.lsdschemes.plist

@jehnes solutions works! However after quitting Xcode (all instances) clang-format menu item disappears, and i have to run XcodeClangFormat project again.

I could reproduce this issue on a fresh installation of El Capitan with Xcode 8, but I was unable to find a better solution than cloning this repository and following the steps for building this extension.

I have now macOS Sierra, but nothing changed. @jehnes solution still works, but menu item disappears after Xcode quit and i have to run XcodeClangFormat again.
Besides I bought Xformat app on MAS, it claims it adds menu item on Xcode, but it doesn't work.

could you please give a clear example to show how to install, what you said make me confused...

@libo19931030 For clang-format target set Executable to "Xcode.app" (select Other... and find Xcode in Applications). Then just Run (Command-R).