When I try to build a project with Xcode 12 Beta 4 to test iOS14, I got a plenty of Undefined symbols for architecture x86_64. Every time I build the app, the list of errors is changed. Native libraries fail to recognize base React classes.
Undefined symbols for architecture x86_64:
	"_RCTMakeAndLogError", referenced from:
			_RCTErrorForKey in RNCAsyncStorage.o
			-[RNCAsyncStorage _writeEntry:changedManifest:] in RNCAsyncStorage.o
	"_RCTJSErrorFromNSError", referenced from:
			-[RNCAsyncStorage multiMerge:callback:] in RNCAsyncStorage.o
	"_RCTJSONStringify", referenced from:
			-[RNCAsyncStorage _writeManifest:] in RNCAsyncStorage.o
			-[RNCAsyncStorage multiMerge:callback:] in RNCAsyncStorage.o
	"_RCTCurrentThreadName", referenced from:
			-[RNCAsyncStorage _ensureSetup] in RNCAsyncStorage.o
	"_RCTJSONParse", referenced from:
			-[RNCAsyncStorage multiMerge:callback:] in RNCAsyncStorage.o
	"__RCTAssertFormat", referenced from:
			-[RNCAsyncStorage _ensureSetup] in RNCAsyncStorage.o
	"_RCTMD5Hash", referenced from:
			-[RNCAsyncStorage _filePathForKey:] in RNCAsyncStorage.o
	"__RCTLogNativeInternal", referenced from:
			-[RNCAsyncStorage _ensureSetup] in RNCAsyncStorage.o
			_RCTStorageDirectoryMigrationLogError in RNCAsyncStorage.o
	"_RCTMakeError", referenced from:
			-[RNCAsyncStorage _ensureSetup] in RNCAsyncStorage.o
			_RCTReadFile in RNCAsyncStorage.o
			-[RNCAsyncStorage _writeManifest:] in RNCAsyncStorage.o
			-[RNCAsyncStorage _writeEntry:changedManifest:] in RNCAsyncStorage.o
			___37-[RNCAsyncStorage multiGet:callback:]_block_invoke_2 in RNCAsyncStorage.o
			_RCTMakeErrors in RNCAsyncStorage.o
			___25-[RNCAsyncStorage clear:]_block_invoke in RNCAsyncStorage.o
			...
	"_RCTJSONParseMutable", referenced from:
			-[RNCAsyncStorage _ensureSetup] in RNCAsyncStorage.o
			-[RNCAsyncStorage multiMerge:callback:] in RNCAsyncStorage.o
	"_RCTRegisterModule", referenced from:
			+[RNCAsyncStorage load] in RNCAsyncStorage.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
I opened a issue in React-Native repository: https://github.com/facebook/react-native/issues/29633
A sample project with the error happening: https://github.com/igoriols/xcode12reactnativesample
ioliveira
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