Some object files have incompatible Objective-C category definitions. Some category metadata may be lost. All files containing Objective-C categories should be built using the same compiler.
We get this warning after updating to Swift 3.0. We have third party Obj-C dependencies that we integrate using cocoapods. Any ideas how to solve it? I'm guessing it's solvable by changing something in the build settings?
I think you need to have both your libraries and your source code be Swift 3.
There's a pretty great article by Jessie Squires about how to do this. I'm actually experiencing a problem beyond this.
But it is a very good solution: http://www.jessesquires.com/migrating-to-swift-3/
I'm having a problem beyond this, but I hope this helps you out.
~ Hemant
I solved this in my project, you can see my answer if it helps at https://forums.developer.apple.com/message/146579
