Cannot debug Swift module/framework embedded in Objective-C app

Question

Alternative titles (to aid searching)

• Cannot debug Swift 2.3 framework linked to an Objective-C app in Xcode 8
• error in auto-import: f

Answer 1

As suggested by Tim https://stackoverflow.com/a/41876400/1840269 the root cause to our problem was a matter of duplicates.

We had a obj-c wrapper category for SDWebImage that was used from both obj-c and Swift. When Importing the category from Swift everything blew up because of redefinition/duplicate import since the SDWebImage pod already exposed it self as a Swift module.

The solution? We re-implemented the obj-c category as a Swift extension - and kept using it from both Swift and obj-c by adding @objc in front of the extension and importing the #import "product-Swift.h" file from obj-c.

And maybe start with checking: https://developer.apple.com/library/content/qa/qa1947/_index.html.