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.

This can resolve your problem, It describes how to fix in details https://stackoverflow.com/a/54586937/1627358 — Hussam Kurd, Feb 08 '19 at 06:17
@HussamKurd: There's another answer there (with a lot more upvotes) that worked for me. — joriki, Jul 07 '19 at 06:00

score 69 · Answer 1 · answered May 17 '19 at 13:06

69

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:

Adding a new Swift file and a Brigde header:

1) File -> New -> File

2) Select Swift File

3) Confirm Create Bridging Header

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

answered May 17 '19 at 13:06

AlVelig

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but the issue still present if you remove that swift file later :/ – jdnichollsc Jul 14 '19 at 08:14
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Thank you so much, it solved my issue. By the way, I'm trying to build using react-native. – Naveen Raju Oct 18 '19 at 06:28
I've been spending two days trying to fix this issue and you saved me! – romin21 Nov 15 '19 at 15:56
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why i cant see Confirm Create Bridging Header dialog? – Tuan Nguyen Jan 18 '20 at 13:15
@TuanNguyen just create an empty header file by yourself. In the same directory and targets as your empty swift file. It worked for me. – Kamil Lewandowski Mar 11 '20 at 14:01
I had to perform this again when upgrading from xcode 11 to 12. – lambinator Aug 19 '20 at 18:04
if a bridging header dialog doesn't prompt, follow this. (to remove old one) https://stackoverflow.com/questions/31716413/xcode-not-automatically-creating-bridging-header – papacostas Mar 09 '21 at 13:57
For me, with an ejected Expo/react-native project, I simply added the empty swift file and it worked. No bridge dialog needed. Thanks for this! – Dan May 25 '21 at 20:26

score 68 · Answer 2 · answered May 23 '18 at 18:39

68

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.

answered May 23 '18 at 18:39

Alex Roslyakov

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by creating Objective-C bridging Header is resolved the issue. – Antony Raphel Nov 03 '18 at 04:57
Sweet. Kind of elegant solution. Xcode shows as warnings not errors. This solution fixed warnings and all erros caused by warnings. – fct Jan 05 '19 at 21:40
I did this and still get the same error. Trying to ad adMob. Could not find auto-linked framework 'FBLPromises' – Curtis May 18 '20 at 06:53

score 0 · Answer 3 · answered Jul 07 '19 at 05:59

0

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

answered Jul 07 '19 at 05:59

joriki

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score 0 · Answer 4 · answered May 06 '20 at 04:24

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Right click on your project name and select new file
Create an empty "Swift File" called File.Swift
It will prompt to create a bridge header file then click create

answered May 06 '20 at 04:24

Chinedu Ofor

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score 0 · Answer 5 · answered Oct 21 '20 at 07:35

0

If create empty "Swift File" errors

This method may be useful, can try ： https://blog.cpming.top/p/react-native-0-62-undefined-symbol

answered Oct 21 '20 at 07:35

iHTCboy

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score 0 · Answer 6 · edited Feb 15 '21 at 18:56

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I just follow AlVelig steps and still can't build the app, after making some hours on it finally works for me: in Build, Setting -> Build Active Architecture Only -> Select yes for Release too (it was No)

Build Active Architecture Only:

edited Feb 15 '21 at 18:56

Sinval

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answered Feb 15 '21 at 17:36

msaba

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

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