It gives errors when using Swift Static library with Objective-C project

Question

I need to make swift static library for my requirement. I made swift static library which uses swift and Obj-c code. I have included Obj-c files via bridge file. I am able to compile swift static library without any error and get libMySwift.a file. I use Xcode9.3 with Swift4 to compile library.

I include libMySwift.a in obj-c project and also included obj-c compatible header to access my lib in the project. When I try to compile the project it give below warning and more than 200 errors.

Auto-Linking library not found for -lswiftSwiftOnoneSupport
Auto-Linking library not found for -lswiftCore
Auto-Linking library not found for -lswiftQuartzCore
Auto-Linking library not found for -lswiftCoreImage
Auto-Linking library not found for -lswiftCoreGraphics
Auto-Linking library not found for -lswiftObjectiveC
Auto-Linking library not found for -lswiftDispatch
Auto-Linking library not found for -lswiftMetal
Auto-Linking library not found for -lswiftFoundation
Auto-Linking library not found for -lswiftUIKit
Auto-Linking library not found for -lswiftDarwin
Auto-Linking library not found for -lswiftCoreFoundation

Please let me know if I am missing any steps or need to add anything.

Answer 1

I've got the same error on my demo project when added first Swift file in my pod compiled as static library. For me solution was simple - just added empty Swift file to my demo project which was previously in Objective-C only. This solved all linker errors.

Answer 2

An update to Alex's answer:

In my case it was a React-Native project after adding a Swift Pods library. Maybe just the step 2 can work:

1. Adding a new Swift file and a Brigde header:

1) File -> New -> File

2) Select Swift File

3) Confirm Create Bridging Header

2. Go to Build Settings and set Always Embed Swift Standard Libraries to YES
   

Answer 3

This answer worked for me: Add $(TOOLCHAIN_DIR)/usr/lib/swift/$(PLATFORM_NAME) to the library search paths.