‘Project Name’ was compiled with optimization – stepping may behave oddly; variables may not be available

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Trying to step into AFNetworking code generates following warning:

[Project Name] was compiled with optimization - stepping may behave oddly; variables may not be available.

And of course I’m not able to debug the code. To be specific I’m trying to debug UIImageView+AFNetworking category which seems impossible. Changing the code has no effect (tried NSLog, etc) and when trying to step in compilers goes to assembly code and shows UIImageView+TVASTAFNetworking as category name which does not exist anywhere in the code base.

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Using Xcode 7. iOS 9 & 8. Cocoapods (no Framework)

UPDATE
I forgot to mention that Optimizer is set to none for both release and debug configuration and I am in fact using Debug config.

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UPDATE 2

Strip Debug Symbols Is off as well.

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