react-native can't build ios: (error xcode Flipper) Typedef redefinition with different types ('uint8_t' (aka 'unsigned char') vs 'enum clockid_t')

Question

My goal is to run a react native build (ios version).

Situation 1

• Actions: start metro (ok)
• build ios. Problem: build failed with exit code 1.

(CompileC /Users/macbook/Library/Developer/Xcode/DerivedData/NAME_OF_PROJECT-gxlagomyefvmjkdemiakcfycxnhx/Build/Intermediates.noindex/Pods.build/Debug-iphonesimulator/Flipper.build/Objects-normal/x86_64/FlipperRSocketResponder.o /Users/macbook/Documents/work/omg/mobile/ios/Pods/Flipper/xplat/Flipper/FlipperRSocketResponder.cpp normal x86_64 c++ com.apple.compilers.llvm.clang.1_0.compiler)

Situation 2

• Actions: build ios.
• Problem: Flipper:: Typedef redefinition with different types ('uint8_t' (aka 'unsigned char') vs 'enum clockid_t'

Versions

• xcode version 12.5
• ios 9+
• iphone 12

Some actions I tried that didn't work:

1. solution 1

2. solution 2

3. reisntall all pods

4. update all pods

5. reclon project

6. • rm -Rf Pods/*
   • pod cache clean --all
   • pod install

---

and a few other little fixes. Any help would be appreciated.

Answer 1

Change Podfile like below:

  post_install do |installer|
    react_native_post_install(installer)
    __apply_Xcode_12_5_M1_post_install_workaround(installer)
    `sed -i -e  $'s/__IPHONE_10_0/__IPHONE_12_0/' Pods/RCT-Folly/folly/portability/Time.h`
  end

Run pod install and it works!

Answer 2

I also faced the same issue on my very first react-native project when I tried to run it on an ios simulator.

clockid_t

clockid_t is part of one of your systems. The error is actually for redefining clockid_t twice.

Renaming clockid_t to something else solved my problem. I renamed it from clockid_t to clockid_tt and then my project ran smoothly.

Because I'm a beginner react-native dev, I am not sure about whether this solution will create any future problems on my react-native project. Not yet faced any problem with this solution.

Answer 3

If you have use_frameworks! enabled, Flipper will not work and you should disable these next few lines in your Podfile.


# use_flipper!()
#  post_install do |installer|
#    react_native_post_install(installer)
#   __apply_Xcode_12_5_M1_post_install_workaround(installer)
#  end

**OR**

# use_flipper! 
  # post_install do |installer|
  #   flipper_post_install(installer)
  # end