How to enable Visual Memory Debugger in Xcode 8?

Question

I migrated a project from the previous version of Xcode to Xcode 8. What I want is to use the new visual memory debugger. It's available in new projects, but is entirely missing in my imported one. Why is this?

Answer 1

Argument '-sanitize=address' is not supported on the Swift 2.3 toolchain. 
You will need to migrate your project to Swift 3 to use this feature.

Xcode 8 GM build error

P.S. Objective-c supported by Visual Memory Debugger

Answer 2

If you click on Memory, the source editor pane will change to show some memory information, including why it's disabled. In my case, it was because I had Zombie Objects enabled in the Scheme. (Xcode 8.3.2)

Answer 3

It seems like the project requires Swift 3 to enable Adress & Thread Sanitizer (which is the Memory Debugger).

For me this applies to both iOS & OS X/macOS apps. Both written in Swift 2.2 & converted to 2.3.

Note: I only tested this on OS X El Capitan 10.11.5.

@gabriellanata confirms that it works when the code is converted to Swift 3.

Answer 4

It appears that Swift 3 is required for Visual Memory Debugger to work.

My app migrated to Swift 2.3 did not work, when I tried migrating it to Swift 3.0 it worked instantly.

The runtime sanitization checkbox is not required for visual memory debugger to work, however the reason that it is disabled is the same.

Answer 5

I just ran an Objective-C iOS 7 project made with Xcode 7 in Xcode 8 (without migrating) and the Visual Memory Debugger icon appears at the bottom of Xcode in the debugging area next to the Debug View Hierarchy button.

It's the button with the three circles.

From the other comments, it looks like Swift 3 might be required to use this feature.