Unable to build release version for iOS with the new architecture

[wood1986]

Description

I am unable to build release version for iOS with the new architecture. But I can build the debug version.

Here is build error

Undefined symbols for architecture x86_64:
  "folly::SharedMutexImpl<false, void, std::__1::atomic, false, false, false>::deferredReaders", referenced from:
      void folly::SharedMutexImpl<false, void, std::__1::atomic, false, false, false>::applyDeferredReaders<folly::SharedMutexImpl<false, void, std::__1::atomic, false, false, false>::WaitForever>(unsigned int&, folly::SharedMutexImpl<false, void, std::__1::atomic, false, false, false>::WaitForever&) in AppDelegate.o
      void folly::SharedMutexImpl<false, void, std::__1::atomic, false, false, false>::applyDeferredReaders<folly::SharedMutexImpl<false, void, std::__1::atomic, false, false, false>::WaitForever>(unsigned int&, folly::SharedMutexImpl<false, void, std::__1::atomic, false, false, false>::WaitForever&, unsigned int) in AppDelegate.o
  "folly::SharedMutexImpl<false, void, std::__1::atomic, false, false, false>::unlock()", referenced from:
      std::__1::unique_lock<folly::SharedMutexImpl<false, void, std::__1::atomic, false, false, false> >::~unique_lock() in AppDelegate.o
  "folly::SharedMutexImpl<false, void, std::__1::atomic, false, false, false>::~SharedMutexImpl()", referenced from:
      std::__1::__shared_ptr_emplace<facebook::react::ContextContainer const, std::__1::allocator<facebook::react::ContextContainer const> >::__on_zero_shared() in AppDelegate.o
ld: symbol(s) not found for architecture x86_64

Version

0.68.1

Output of npx react-native info

info Fetching system and libraries information...
System:
    OS: macOS 12.3.1
    CPU: (12) x64 Intel(R) Core(TM) i7-9750H CPU @ 2.60GHz
    Memory: 749.82 MB / 32.00 GB
    Shell: 5.8 - /bin/zsh
  Binaries:
    Node: 18.0.0 - ~/.nvm/versions/node/v18.0.0/bin/node
    Yarn: 1.22.18 - ~/.nvm/versions/node/v18.0.0/bin/yarn
    npm: 8.6.0 - ~/.nvm/versions/node/v18.0.0/bin/npm
    Watchman: 2022.03.21.00 - /usr/local/bin/watchman
  Managers:
    CocoaPods: 1.11.3 - /Users/wood/.rbenv/shims/pod
  SDKs:
    iOS SDK:
      Platforms: DriverKit 21.4, iOS 15.4, macOS 12.3, tvOS 15.4, watchOS 8.5
    Android SDK: Not Found
  IDEs:
    Android Studio: 2021.1 AI-211.7628.21.2111.8309675
    Xcode: 13.3.1/13E500a - /usr/bin/xcodebuild
  Languages:
    Java: 11.0.15 - /usr/bin/javac
  npmPackages:
    @react-native-community/cli: Not Found
    react: 17.0.2 => 17.0.2
    react-native: 0.68.1 => 0.68.1
    react-native-macos: Not Found
  npmGlobalPackages:
    *react-native*: Not Found

Steps to reproduce

1. npx react-native init AwesomeTSProject --template react-native-template-typescript
2. Run RCT_NEW_ARCH_ENABLED=1 bundle exec pod install
3. npx react-native run-ios --configuration Release

Snack, code example, screenshot, or link to a repository

Undefined symbols for architecture x86_64:
  "folly::SharedMutexImpl<false, void, std::__1::atomic, false, false, false>::deferredReaders", referenced from:
      void folly::SharedMutexImpl<false, void, std::__1::atomic, false, false, false>::applyDeferredReaders<folly::SharedMutexImpl<false, void, std::__1::atomic, false, false, false>::WaitForever>(unsigned int&, folly::SharedMutexImpl<false, void, std::__1::atomic, false, false, false>::WaitForever&) in AppDelegate.o
      void folly::SharedMutexImpl<false, void, std::__1::atomic, false, false, false>::applyDeferredReaders<folly::SharedMutexImpl<false, void, std::__1::atomic, false, false, false>::WaitForever>(unsigned int&, folly::SharedMutexImpl<false, void, std::__1::atomic, false, false, false>::WaitForever&, unsigned int) in AppDelegate.o
  "folly::SharedMutexImpl<false, void, std::__1::atomic, false, false, false>::unlock()", referenced from:
      std::__1::unique_lock<folly::SharedMutexImpl<false, void, std::__1::atomic, false, false, false> >::~unique_lock() in AppDelegate.o
  "folly::SharedMutexImpl<false, void, std::__1::atomic, false, false, false>::~SharedMutexImpl()", referenced from:
      std::__1::__shared_ptr_emplace<facebook::react::ContextContainer const, std::__1::allocator<facebook::react::ContextContainer const> >::__on_zero_shared() in AppDelegate.o
ld: symbol(s) not found for architecture x86_64

[tj-mc]

Followed steps but unable to reproduce on M1 Pro

[wood1986]

I missed the step. But did you RCT_NEW_ARCH_ENABLED=1 bundle exec pod install?

[Arkkeeper]

This issue persists both in RN 0.68.x and 0.69 when trying to build release version or to make an archive.

I'm facing it when building for MacCatalyst on M1.

You may add these lines to the end of post_install do |installer| as a temporary solution:

rm -f Pods/Flipper-Folly/folly/SharedMutex.cpp Pods/Flipper-Folly/folly/SharedMutex.h
cp Pods/RCT-Folly/folly/SharedMutex.cpp Pods/Flipper-Folly/folly/
cp Pods/RCT-Folly/folly/SharedMutex.h Pods/Flipper-Folly/folly/

[fabOnReact]

#33167 https://github.com/facebook/folly/blob/main/folly/docs/Futures.md

[cipolleschi]

Hi @wood1986, thanks for the issue. Is the issue solved with the #33167 linked by @fabriziobertoglio1987 or is it still there?

[cortinico]

Hi @wood1986, thanks for the issue. Is the issue solved with the #33167 linked by @fabriziobertoglio1987 or is it still there?

@cipolleschi Nope I don't think the linked PR is relevant here. Such PR was fixing a build failure on Android, while the user is reporting an issue on iOS

[fabOnReact]

sorry. I don't know the solution to this issue. I just included links to relevant conversations, which would help me find a solution. What I did find out is the following:

Similar issue was experienced in the past. The symbol error was previously caused by folly depending on libc++abi
8b6d7fd

seems that https://stackoverflow.com/a/33686591/7295772 different environment use different libraries

https://gcc.gnu.org/onlinedocs/gcc-11.3.0/libstdc++/api/a00176_source.html
8b6d7fd#diff-5de3520951eb222bc3b5b734cc1003e84a53fb42220159fedc58768bda2e2cf3R75

this are the folly releases https://github.com/facebook/folly/releases. I did not find anything relevant in the new releases.

@Arkkeeper understand this issue and he tested this solution

rm -f Pods/Flipper-Folly/folly/SharedMutex.cpp Pods/Flipper-Folly/folly/SharedMutex.h
cp Pods/RCT-Folly/folly/SharedMutex.cpp Pods/Flipper-Folly/folly/
cp Pods/RCT-Folly/folly/SharedMutex.h Pods/Flipper-Folly/folly/

so seems that the issue is caused by the Flipper-Folly SharedMutex , while it works with RCT-Folly SharedMutex

this are the configs for folly futures in Flipper-Folly
https://github.com/facebook/flipper/blob/0f038218f893d86e91714cd91eed8e37d756386c/iOS/Podspecs/Flipper-Folly.podspec#L74

this are the configs for folly-futures in RCT-Folly
https://github.com/facebook/react-native/blob/main/third-party-podspecs/RCT-Folly.podspec#L106-L148

I'm not sure that this is connected to futures
The above PR fixed the issue in folly futures, https://github.com/facebook/folly/blob/b72a70a35ada45ac286eb60028c0ecf5f6725665/folly/SharedMutex.h#L554-L571 as the undefined reference was unlock_shared

This is an explanation of unlock_shared, deferredReaders seems to be an array of readers used to access data

https://github.com/facebook/folly/blob/69b6f947ea9aeb73235ccabf235a6804e0f54946/folly/SharedMutex.h#L128-L161

in this case the undefined symbol is folly::SharedMutexImpl<..>::deferredReaders

It's 22:35 here and I have to go to sleep. Sorry for my incomplete message. 🙏
I'll come back to this post in the future. Thanks.

[wood1986]

I have a question for you guys.

Doing this does not make sense

rm -f Pods/Flipper-Folly/folly/SharedMutex.cpp Pods/Flipper-Folly/folly/SharedMutex.h
cp Pods/RCT-Folly/folly/SharedMutex.cpp Pods/Flipper-Folly/folly/
cp Pods/RCT-Folly/folly/SharedMutex.h Pods/Flipper-Folly/folly/

If I comment out use_flipper!() in the Podfile, I can build release successfully. Is building release without flipper the best practice?