Xcode build fails due to Undefined symbol: __swift_FORCE_LOAD_$_swiftUIKit

user_453435 0
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I created a brand new project in Xcode 11 (an iOS single-view project with SwiftUI) and enable Mac as a target device. Without doing anything else, I try to build, and I get this error:

ld: warning: directory not found for option '-L/Applications/Xcode'
ld: warning: directory not found for option '-L11.0-Beta.2.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/uikitformac'
ld: warning: directory not found for option '-L/Applications/Xcode'
ld: warning: directory not found for option '-L11.0-Beta.2.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/swift/uikitformac'
ld: warning: Could not find or use auto-linked library 'swiftUIKit'
Undefined symbols for architecture x86_64:
  "__swift_FORCE_LOAD_$_swiftUIKit", referenced from:
      __swift_FORCE_LOAD_$_swiftUIKit_$_MyProject in AppDelegate.o
      __swift_FORCE_LOAD_$_swiftUIKit_$_MyProject in SceneDelegate.o
      __swift_FORCE_LOAD_$_swiftUIKit_$_MyProject in ContentView.o
     (maybe you meant: __swift_FORCE_LOAD_$_swiftUIKit_$_MyProject)
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Environment

  • macOS 10.15 Catalina Beta (19A487l)
  • Xcode 11.0 beta 2 (11M337n)
    • Swift 5 mode
xcode11 xcode
8 Answers

Update: This works for XCode Version 13.0 (13A233), too.

For XCode Version 12.0.1 (12A7300),

I just added libswiftWebKit.tbd to

Link Binary with Libraries (from project, Build Phases)

and the build was successful.

See image below: enter image description here

user_61118660

Create an Empty Swift file using Xcode, such as named test.swift, and try to run again

user_105115340

Go to Xcode, in the project name, right click and click on “New file…” Select Swift File and click on Next Select the project target and Finish In the next screen select “Create bridging Header” - Make sure to bridge.

Keep the swift file there for future in order to run the simulator.

user_139249490

For me, I used to encounter link error with swift library with Xcode 12, I resolved it by add "$(TOOLCHAIN_DIR)/usr/lib/swift/$(PLATFORM_NAME)" and "$(TOOLCHAIN_DIR)/usr/lib/swift-5.0/$(PLATFORM_NAME)" into the "Library Search Paths" of "Build Settings"

user_10633980

As hinted by the warnings saying directory not found, it seems Xcode doesn't like having a space in its bundle's file name.

I renamed it from Xcode 11.0-Beta.2.app to Xcode-11.0-Beta.2.app and now it builds just fine.

user_4534350

I had this error when I accidentally imported XCTest to the app target. Didn't notice it till I checked git diff. If you run into this issue make sure you didn't export inappropriate stuff too

user_68988490

I had to reinstall Xcode completely, because of missing swift folder in "$(TOOLCHAIN_DIR)/usr/lib"

user_106240000

Remove

"$(TOOLCHAIN_DIR)/usr/lib/swift-5.0/$(PLATFORM_NAME)" from "Library Search Paths" of "Build Settings"

user_77382300
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