`react-native run-ios` build failure on XCode 12.5 beta

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I’m getting a build error while attempting to test our react-native app in XCode 12.5 beta. Apologies if this is inappropriate but it appears to be a real issue.

I’m running "react-native": "0.62.2" (however, it doesn’t appear this is fixed in the lastest stable release)

It looks like this exact issue was fixed in https://github.com/facebook/react-native/pull/28362, which is part of 0.63+. This PR indicates it was fixed for Clang 10 but as far as I can tell the clang/llvm version hasn’t changed between 12.4 and 12.5. The app builds correctly when using 12.4 command line tools but not 12.5 beta command line tools (configured via XCode preferences).

The build error (with compiler):

** BUILD FAILED **

The following build commands failed:
        CompileC .../Build/Intermediates.noindex/Pods.build/Debug-iphonesimulator/React-Core.build/Objects-normal/x86_64/RCTCxxBridge.o /Users/bkraft/Projects/zabo-mobile/node_modules/react-native/React/CxxBridge/RCTCxxBridge.mm normal x86_64 objective-c++ com.apple.compilers.llvm.clang.1_0.compiler
(1 failure)

The stack trace is as follows,

/node_modules/react-native/React/CxxBridge/RCTCxxBridge.mm:331:34: error: cannot initialize a parameter of type 'NSArray<id<RCTBridgeModule>> *' with an rvalue of type 'NSArray<Class> *'
  (void)[self _initializeModules:RCTGetModuleClasses() withDispatchGroup:prepareBridge lazilyDiscovered:NO];
                                 ^~~~~~~~~~~~~~~~~~~~~
/node_modules/react-native/React/CxxBridge/RCTCxxBridge.mm:771:82: note: passing argument to parameter 'modules' here
- (NSArray<RCTModuleData *> *)_initializeModules:(NSArray<id<RCTBridgeModule>> *)modules
                                                                                 ^
/node_modules/react-native/React/CxxBridge/RCTCxxBridge.mm:776:79: error: cannot initialize a parameter of type 'NSArray<Class> *' with an lvalue of type 'NSArray<id<RCTBridgeModule>> *__strong'
  NSArray<RCTModuleData *> *moduleDataById = [self _registerModulesForClasses:modules lazilyDiscovered:lazilyDiscovered];
                                                                              ^~~~~~~
/node_modules/react-native/React/CxxBridge/RCTCxxBridge.mm:618:76: note: passing argument to parameter 'moduleClasses' here
- (NSArray<RCTModuleData *> *)_registerModulesForClasses:(NSArray<Class> *)moduleClasses
                                                                           ^
/node_modules/react-native/React/CxxBridge/RCTCxxBridge.mm:827:69: error: cannot initialize a parameter of type 'NSArray<id<RCTBridgeModule>> *' with an lvalue of type 'NSArray<Class> *__strong'
    NSArray<RCTModuleData *> *newModules = [self _initializeModules:modules withDispatchGroup:NULL lazilyDiscovered:YES];
                                                                    ^~~~~~~
/Users/bkraft/Projects/zabo-mobile/node_modules/react-native/React/CxxBridge/RCTCxxBridge.mm:771:82: note: passing argument to parameter 'modules' here
- (NSArray<RCTModuleData *> *)_initializeModules:(NSArray<id<RCTBridgeModule>> *)modules

[Ericgou3]

Modify the func at line 746 in RCTCxxBridge.mm from

• (NSArray<RCTModuleData *> *)_initializeModules:(NSArray<id< RCTBridgeModule > > *)modules withDispatchGroup:(dispatch_group_t)dispatchGroup lazilyDiscovered:(BOOL)lazilyDiscovered to
• (NSArray<RCTModuleData *> *)_initializeModules:(NSArray *)modules withDispatchGroup:(dispatch_group_t)dispatchGroup lazilyDiscovered:(BOOL)lazilyDiscovered It works for me!

[uijunii]

Try this

1. Edit Podfile in ios directory like this ↓ =========================== use_flipper!

   ↓
   

use_flipper!({ ‘Flipper-Folly’ => ‘2.3.0’ })

1. npm install in project folder
2. pod install in ios folder