iOS won't build on fresh project with latest MacOS 11.3 and Xcode 12.5

[yeong0809]

Description

Fresh new project won't build in MacOS 11.3 and Xcode 12.5.

React Native version:

"react": "17.0.1",
"react-native": "0.64.0"

Steps To Reproduce

Provide a detailed list of steps that reproduce the issue.

1. create new project
2. react-native run-ios

Expected Results

App run normally

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

[dejolt]

TEMPORARY SOLUTION!

I got around the error by commenting out use_flipper!() in the pod file, and run pod install. Seems to be a flipper issue. Give it a try see if it works while there's a better solution.

[iaroslav-ternovyi]

try this

[robbiemccorkell]

Similar to @iaroslav-ternovyi's comment. This patch from @j2teamlbh worked for me as a temporary solution: facebook/flipper#2215 (comment)

You'll need to go into the Filipper-Folly dependancy in the Pods directory and apply the following diff to the file:

{project-name}/ios/Pods/Flipper-Folly/folly/synchronization/DistributedMutex-inl.h

facebook/folly@8477e25#diff-65ad309ca9c636ba81eb7953fce06e6963c51296a60dc25eb4a5b1463482c6da

It seems like we might need to wait for a new version of Flipper-Folly for this to be fixed.

[danyasnov]

it's time to install xcode not from the AppStore

[AlexHooperDev]

Similar to @iaroslav-ternovyi's comment. This patch worked for me as a temporary solution: facebook/flipper#2215 (comment)
You'll need to go into the Filipper-Folly dependancy in the Pods directory and apply the following diff to the file:

This fixed the issue for flipper-folly however it just causes the same CompileC error on another flipper pod FlipperRSocketResponder.

globally disabling flipper also doesn't work, and instead causes the following CompileC error to happen:
CompileC /Users/alex.hooper/Library/Developer/Xcode/DerivedData/Espresso-brgntaoyjolqyfdzcsunjlqtzzum/Build/Intermediates.noindex/Espresso.build/Debug-iphoneos/Espresso.build/Objects-normal/arm64/AppDelegate.o /Users/alex.hooper/Documents/figloo-bank-mobile/ios/Espresso/AppDelegate.m normal arm64 objective-c com.apple.compilers.llvm.clang.1_0.compiler

[SevrainChea]

Commenting use_flipper() in the Podfile fixed the issue for me, waiting for them to fix it to uncomment it !

[kelset]

hey folks looks like this was already reported here: #31179 so for the sake of having one place where the conversation will proceed forward I'll close this as duplicate, please post your comments in the other issue :)

[sarafhbk]

@robbiemccorkell the solution is working for me. Could you please help me doing the Flipper-Folly patch package

[webmasterdevlin]

I just want to share this link https://developer.apple.com/download/more/?=xcode. Downgrading to a lower version of XCode is okay if the latest features of XCode 12.5 are not crucial in your project.

[archcorsair]

Can confirm 0.64.1 fixes this for me!

[kelset]

I'm going to lock this since now there's -> #31480