Undefined symbols for architecture x86_64 when using Tesseract

Question

I am using tesseract provided by google. After following this tutorial, i finally built finish my app. However, when i run it, i run into the problem of undefined symbols. This is the error

Undefined symbols for architecture x86_64:
  "_OBJC_CLASS_$_G8Tesseract", referenced from:
      objc-class-ref in ViewController.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

How do i fix this issue? I tried searching online but none of the solutions worked for me. I tried reinstalling the pods and updating it. Then i faced this error

clang: error: no such file or directory: '/Users/admin/Desktop/tst/Pods/Target Support Files/Pods-tst/Pods-tst-dummy.m'
clang: error: no input files

When i tried redoing the project i get his error

Undefined symbols for architecture arm64:
  "_OBJC_CLASS_$_G8Tesseract", referenced from:
      objc-class-ref in ViewController.o
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Answer 1

I think you should update pod version:

sudo gem install cocoapods

After this run:

pod update --verbose

Answer 2

Apparently i had to add the TesseractOCR.framework separately even after using cocoa pods and disable Bitcode. This prevented the errors.

Answer 3

Since Tesseract requires libstdc++.6.0.9.dylib (or libstdc++.6.0.9.tbd if libstdc++.6.0.9.dylib is unavailable in your current Xcode version) and CoreImage.framework you’ll need to link both of these libraries in.

In the General tab, scroll down to Linked Frameworks and Libraries.

There should be only one file here: TesseractOCR.framework, which you just added. Click the + button underneath the list. Find both libstdc++.dylib (or libstdc++.6.0.9.tbd) and CoreImage.framework and add them to your project.