Update realm from 2.29.2 to 5.0.3 in my react-native project.
edit: It seems to have nothing to do with realm upgrade, because I upgrade react-native from 0.60.5 to 0.62.2 before upgrading realm, when I downgrade realm to 2.29.2, this build failure still exists.
Successfully build RealmReact with react native 0.62.2 (Flipper).
Failed to compile RealmAnalytics.mm. Failed to build RealmReact.
Here are the Xcode build messages and the snapshot of it.

`
CompileC /Users/jackyao/Library/Developer/Xcode/DerivedData/IndividualManagement-bydmeqfaqklessatftyybnsyykds/Build/Intermediates.noindex/RealmReact.build/Debug-iphoneos/RealmReact.build/Objects-normal/arm64/RealmAnalytics.o /Users/jackyao/ReactNative/individualmanagement/node_modules/realm/react-native/ios/RealmReact/RealmAnalytics.mm normal arm64 objective-c++ com.apple.compilers.llvm.clang.1_0.compiler (in target 'RealmReact' from project 'RealmReact')
cd /Users/jackyao/ReactNative/individualmanagement/node_modules/realm/react-native/ios
export LANG=en_US.US-ASCII
/Users/jackyao/ReactNative/individualmanagement/node_modules/realm/react-native/ios/../../scripts/ccache-clang.sh -x objective-c++ -target arm64-apple-ios8.0 -fmessage-length=0 -fdiagnostics-show-note-include-stack -fmacro-backtrace-limit=0 -std=c++14 -stdlib=libc++ -fobjc-arc -fmodules -fmodules-cache-path=/Users/jackyao/Library/Developer/Xcode/DerivedData/ModuleCache.noindex -fmodules-prune-interval=86400 -fmodules-prune-after=345600 -fbuild-session-file=/Users/jackyao/Library/Developer/Xcode/DerivedData/ModuleCache.noindex/Session.modulevalidation -fmodules-validate-once-per-build-session -Wnon-modular-include-in-framework-module -Werror=non-modular-include-in-framework-module -Wno-trigraphs -fpascal-strings -O0 -fno-common -Wno-missing-field-initializers -Wno-missing-prototypes -Werror=return-type -Wunreachable-code -Wno-implicit-atomic-properties -Werror=deprecated-objc-isa-usage -Wno-objc-interface-ivars -Werror=objc-root-class -Wno-arc-repeated-use-of-weak -Wimplicit-retain-self -Wno-non-virtual-dtor -Wno-overloaded-virtual -Wno-exit-time-destructors -Wduplicate-method-match -Wno-missing-braces -Wparentheses -Wswitch -Wunused-function -Wno-unused-label -Wno-unused-parameter -Wunused-variable -Wunused-value -Wempty-body -Wuninitialized -Wconditional-uninitialized -Wno-unknown-pragmas -Wno-shadow -Wno-four-char-constants -Wno-conversion -Wconstant-conversion -Wint-conversion -Wbool-conversion -Wenum-conversion -Wno-float-conversion -Wnon-literal-null-conversion -Wobjc-literal-conversion -Wshorten-64-to-32 -Wno-newline-eof -Wno-selector -Wno-strict-selector-match -Wundeclared-selector -Wdeprecated-implementations -Wno-c++11-extensions -DDEBUG=1 -DOBJC_OLD_DISPATCH_PROTOTYPES=0 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS13.2.sdk -fstrict-aliasing -Wprotocol -Wdeprecated-declarations -Winvalid-offsetof -g -Wno-sign-conversion -Winfinite-recursion -Wmove -Wcomma -Wblock-capture-autoreleasing -Wstrict-prototypes -Wrange-loop-analysis -Wno-semicolon-before-method-body -fembed-bitcode-marker -index-store-path /Users/jackyao/Library/Developer/Xcode/DerivedData/IndividualManagement-bydmeqfaqklessatftyybnsyykds/Index/DataStore -iquote /Users/jackyao/Library/Developer/Xcode/DerivedData/IndividualManagement-bydmeqfaqklessatftyybnsyykds/Build/Intermediates.noindex/RealmReact.build/Debug-iphoneos/RealmReact.build/RealmReact-generated-files.hmap -I/Users/jackyao/Library/Developer/Xcode/DerivedData/IndividualManagement-bydmeqfaqklessatftyybnsyykds/Build/Intermediates.noindex/RealmReact.build/Debug-iphoneos/RealmReact.build/RealmReact-own-target-headers.hmap -I/Users/jackyao/Library/Developer/Xcode/DerivedData/IndividualManagement-bydmeqfaqklessatftyybnsyykds/Build/Intermediates.noindex/RealmReact.build/Debug-iphoneos/RealmReact.build/RealmReact-all-target-headers.hmap -iquote /Users/jackyao/Library/Developer/Xcode/DerivedData/IndividualManagement-bydmeqfaqklessatftyybnsyykds/Build/Intermediates.noindex/RealmReact.build/Debug-iphoneos/RealmReact.build/RealmReact-project-headers.hmap -I/Users/jackyao/Library/Developer/Xcode/DerivedData/IndividualManagement-bydmeqfaqklessatftyybnsyykds/Build/Products/Debug-iphoneos/include -I/Users/jackyao/ReactNative/individualmanagement/node_modules/realm/src -I/Users/jackyao/ReactNative/individualmanagement/node_modules/realm/src/object-store/src -I/Users/jackyao/ReactNative/individualmanagement/node_modules/realm/src/object-store/external/json -I/Users/jackyao/ReactNative/individualmanagement/node_modules/realm/vendor -I/Users/jackyao/ReactNative/individualmanagement/node_modules/realm/vendor/realm-ios/include -I../../vendor/GCDWebServer/GCDWebServer -I../../vendor/GCDWebServer/GCDWebServer/Core -I../../vendor/GCDWebServer/GCDWebServer/Requests -I../../vendor/GCDWebServer/GCDWebServer/Responses -I../../../react-native/React -I../../../react-native/React/Base -I../../../react-native/React/CoreModules -I../../../react-native/React/CxxBridge -I../../../react-native/React/CxxModule -I../../../react-native/React/CxxUtils -I../../../react-native/React/DevSupport -I../../../react-native/React/Fabric -I../../../react-native/React/Inspector -I../../../react-native/React/Modules -I../../../react-native/React/Profiler -I../../../react-native/React/UIUtils -I../../../react-native/React/Views -I../../../react-native/React/Base/Surface -I../../../react-native/React/Fabric/Mounting -I../../../react-native/React/Fabric/Surface -I../../../react-native/React/Fabric/Utils -I../../../react-native/React/Views/RefreshControl -I../../../react-native/React/Views/SafeAreaView -I../../../react-native/React/Views/ScrollView -I../../../react-native/React/Base/Surface/SurfaceHostingView -I../../../react-native/React/Fabric/Mounting/ComponentViews -I../../../react-native/React/Fabric/Mounting/ComponentViews/ART -I../../../react-native/React/Fabric/Mounting/ComponentViews/ActivityIndicator -I../../../react-native/React/Fabric/Mounting/ComponentViews/Image -I../../../react-native/React/Fabric/Mounting/ComponentViews/LegacyViewManagerInterop -I../../../react-native/React/Fabric/Mounting/ComponentViews/Modal -I../../../react-native/React/Fabric/Mounting/ComponentViews/Root -I../../../react-native/React/Fabric/Mounting/ComponentViews/SafeAreaView -I../../../react-native/React/Fabric/Mounting/ComponentViews/ScrollView -I../../../react-native/React/Fabric/Mounting/ComponentViews/Slider -I../../../react-native/React/Fabric/Mounting/ComponentViews/Switch -I../../../react-native/React/Fabric/Mounting/ComponentViews/Text -I../../../react-native/React/Fabric/Mounting/ComponentViews/UnimplementedComponent -I../../../react-native/React/Fabric/Mounting/ComponentViews/UnimplementedView -I../../../react-native/React/Fabric/Mounting/ComponentViews/View -I../../../../ios/Pods/Headers/Public -I../../../../ios/Pods/Headers/Public/CocoaAsyncSocket -I../../../../ios/Pods/Headers/Public/CocoaLibEvent -I../../../../ios/Pods/Headers/Public/DoubleConversion -I../../../../ios/Pods/Headers/Public/FBLazyVector -I../../../../ios/Pods/Headers/Public/FBReactNativeSpec -I../../../../ios/Pods/Headers/Public/Flipper -I../../../../ios/Pods/Headers/Public/Flipper-DoubleConversion -I../../../../ios/Pods/Headers/Public/Flipper-Folly -I../../../../ios/Pods/Headers/Public/Flipper-Glog -I../../../../ios/Pods/Headers/Public/Flipper-PeerTalk -I../../../../ios/Pods/Headers/Public/Flipper-RSocket -I../../../../ios/Pods/Headers/Public/FlipperKit -I../../../../ios/Pods/Headers/Public/GCDWebServer -I../../../../ios/Pods/Headers/Public/Interactable -I../../../../ios/Pods/Headers/Public/OpenSSL-Universal -I../../../../ios/Pods/Headers/Public/RCTRequired -I../../../../ios/Pods/Headers/Public/RCTTypeSafety -I../../../../ios/Pods/Headers/Public/RNCPushNotificationIOS -I../../../../ios/Pods/Headers/Public/RNDateTimePicker -I../../../../ios/Pods/Headers/Public/RNDeviceInfo -I../../../../ios/Pods/Headers/Public/RNGestureHandler -I../../../../ios/Pods/Headers/Public/RNLocalize -I../../../../ios/Pods/Headers/Public/RNOpenAppSettings -I../../../../ios/Pods/Headers/Public/RNReanimated -I../../../../ios/Pods/Headers/Public/RNSVG -I../../../../ios/Pods/Headers/Public/RNScreens -I../../../../ios/Pods/Headers/Public/RNSound -I../../../../ios/Pods/Headers/Public/RNVectorIcons -I../../../../ios/Pods/Headers/Public/React-Core -I../../../../ios/Pods/Headers/Public/React-RCTText -I../../../../ios/Pods/Headers/Public/React-cxxreact -I../../../../ios/Pods/Headers/Public/React-jsi -I../../../../ios/Pods/Headers/Public/React-jsiexecutor -I../../../../ios/Pods/Headers/Public/React-jsinspector -I../../../../ios/Pods/Headers/Public/ReactCommon -I../../../../ios/Pods/Headers/Public/ReactNativeART -I../../../../ios/Pods/Headers/Public/Yoga -I../../../../ios/Pods/Headers/Public/YogaKit -I../../../../ios/Pods/Headers/Public/glog -I../../../../ios/Pods/Headers/Public/react-native-background-timer -I../../../../ios/Pods/Headers/Public/react-native-blur -I../../../../ios/Pods/Headers/Public/react-native-keep-awake -I../../../../ios/Pods/Headers/Public/CocoaLibEvent/event2 -I../../../../ios/Pods/Headers/Public/DoubleConversion/double-conversion -I../../../../ios/Pods/Headers/Public/FBLazyVector/FBLazyVector -I../../../../ios/Pods/Headers/Public/FBReactNativeSpec/FBReactNativeSpec -I../../../../ios/Pods/Headers/Public/Flipper-DoubleConversion/double-conversion -I../../../../ios/Pods/Headers/Public/Flipper-Folly/folly -I../../../../ios/Pods/Headers/Public/Flipper-Glog/glog -I../../../../ios/Pods/Headers/Public/Flipper-PeerTalk/peertalk -I../../../../ios/Pods/Headers/Public/Flipper-RSocket/rsocket -I../../../../ios/Pods/Headers/Public/Flipper-RSocket/yarpl -I../../../../ios/Pods/Headers/Public/FlipperKit/FBDefines -I../../../../ios/Pods/Headers/Public/FlipperKit/FlipperKitHighlightOverlay -I../../../../ios/Pods/Headers/Public/FlipperKit/FlipperKitLayoutPlugin -I../../../../ios/Pods/Headers/Public/FlipperKit/FlipperKitLayoutTextSearchable -I../../../../ios/Pods/Headers/Public/FlipperKit/FlipperKitNetworkPlugin -I../../../../ios/Pods/Headers/Public/FlipperKit/FlipperKitReactPlugin -I../../../../ios/Pods/Headers/Public/FlipperKit/FlipperKitUserDefaultsPlugin -I../../../../ios/Pods/Headers/Public/FlipperKit/SKIOSNetworkPlugin -I../../../../ios/Pods/Headers/Public/OpenSSL-Universal/openssl -I../../../../ios/Pods/Headers/Public/RCTRequired/RCTRequired -I../../../../ios/Pods/Headers/Public/RCTTypeSafety/RCTTypeSafety -I../../../../ios/Pods/Headers/Public/React-Core/React -I../../../../ios/Pods/Headers/Public/React-RCTText/RCTText -I../../../../ios/Pods/Headers/Public/React-cxxreact/cxxreact -I../../../../ios/Pods/Headers/Public/React-jsi/jsi -I../../../../ios/Pods/Headers/Public/React-jsiexecutor/jsireact -I../../../../ios/Pods/Headers/Public/React-jsinspector/jsinspector -I../../../../ios/Pods/Headers/Public/ReactCommon/ReactCommon -I../../../../ios/Pods/Headers/Public/Yoga/yoga -I../../../../ios/Pods/Headers/Public/glog/glog -I../../../../ios/Pods/Headers/Public/Flipper-Folly/folly/chrono -I../../../../ios/Pods/Headers/Public/Flipper-Folly/folly/concurrency -I../../../../ios/Pods/Headers/Public/Flipper-Folly/folly/container -I../../../../ios/Pods/Headers/Public/Flipper-Folly/folly/detail -I../../../../ios/Pods/Headers/Public/Flipper-Folly/folly/executors -I../../../../ios/Pods/Headers/Public/Flipper-Folly/folly/experimental -I../../../../ios/Pods/Headers/Public/Flipper-Folly/folly/functional -I../../../../ios/Pods/Headers/Public/Flipper-Folly/folly/futures -I../../../../ios/Pods/Headers/Public/Flipper-Folly/folly/gen -I../../../../ios/Pods/Headers/Public/Flipper-Folly/folly/hash -I../../../../ios/Pods/Headers/Public/Flipper-Folly/folly/init -I../../../../ios/Pods/Headers/Public/Flipper-Folly/folly/io -I../../../../ios/Pods/Headers/Public/Flipper-Folly/folly/lang -I../../../../ios/Pods/Headers/Public/Flipper-Folly/folly/memory -I../../../../ios/Pods/Headers/Public/Flipper-Folly/folly/net -I../../../../ios/Pods/Headers/Public/Flipper-Folly/folly/portability -I../../../../ios/Pods/Headers/Public/Flipper-Folly/folly/ssl -I../../../../ios/Pods/Headers/Public/Flipper-Folly/folly/synchronization -I../../../../ios/Pods/Headers/Public/Flipper-Folly/folly/system -I../../../../ios/Pods/Headers/Public/Flipper-Folly/folly/tracing -I../../../../ios/Pods/Headers/Public/Flipper-RSocket/rsocket/benchmarks -I../../../../ios/Pods/Headers/Public/Flipper-RSocket/rsocket/framing -I../../../../ios/Pods/Headers/Public/Flipper-RSocket/rsocket/internal -I../../../../ios/Pods/Headers/Public/Flipper-RSocket/rsocket/statemachine -I../../../../ios/Pods/Headers/Public/Flipper-RSocket/rsocket/transports -I../../../../ios/Pods/Headers/Public/Flipper-RSocket/yarpl/flowable -I../../../../ios/Pods/Headers/Public/Flipper-RSocket/yarpl/observable -I../../../../ios/Pods/Headers/Public/Flipper-Folly/folly/container/detail -I../../../../ios/Pods/Headers/Public/Flipper-Folly/folly/executors/task_queue -I../../../../ios/Pods/Headers/Public/Flipper-Folly/folly/executors/thread_factory -I../../../../ios/Pods/Headers/Public/Flipper-Folly/folly/futures/detail -I../../../../ios/Pods/Headers/Public/Flipper-Folly/folly/hash/detail -I../../../../ios/Pods/Headers/Public/Flipper-Folly/folly/io/async -I../../../../ios/Pods/Headers/Public/Flipper-Folly/folly/memory/detail -I../../../../ios/Pods/Headers/Public/Flipper-Folly/folly/net/detail -I../../../../ios/Pods/Headers/Public/Flipper-Folly/folly/ssl/detail -I../../../../ios/Pods/Headers/Public/Flipper-Folly/folly/synchronization/detail -I../../../../ios/Pods/Headers/Public/Flipper-RSocket/rsocket/transports/tcp -I../../../../ios/Pods/Headers/Public/Flipper-Folly/folly/io/async/ssl -I/Users/jackyao/ReactNative/individualmanagement/node_modules/realm/tests/react-test-app/ios/Pods/Headers/Public/React -I/Users/jackyao/ReactNative/individualmanagement/node_modules/realm/examples/ReactExample/node_modules/react-native/React -I/Users/jackyao/ReactNative/individualmanagement/ios/Pods/Headers/Public/React-Core -I/Users/jackyao/Library/Developer/Xcode/DerivedData/IndividualManagement-bydmeqfaqklessatftyybnsyykds/Build/Intermediates.noindex/RealmReact.build/Debug-iphoneos/RealmReact.build/DerivedSources-normal/arm64 -I/Users/jackyao/Library/Developer/Xcode/DerivedData/IndividualManagement-bydmeqfaqklessatftyybnsyykds/Build/Intermediates.noindex/RealmReact.build/Debug-iphoneos/RealmReact.build/DerivedSources/arm64 -I/Users/jackyao/Library/Developer/Xcode/DerivedData/IndividualManagement-bydmeqfaqklessatftyybnsyykds/Build/Intermediates.noindex/RealmReact.build/Debug-iphoneos/RealmReact.build/DerivedSources -F/Users/jackyao/Library/Developer/Xcode/DerivedData/IndividualManagement-bydmeqfaqklessatftyybnsyykds/Build/Products/Debug-iphoneos -isystem ../../core/include -MMD -MT dependencies -MF /Users/jackyao/Library/Developer/Xcode/DerivedData/IndividualManagement-bydmeqfaqklessatftyybnsyykds/Build/Intermediates.noindex/RealmReact.build/Debug-iphoneos/RealmReact.build/Objects-normal/arm64/RealmAnalytics.d --serialize-diagnostics /Users/jackyao/Library/Developer/Xcode/DerivedData/IndividualManagement-bydmeqfaqklessatftyybnsyykds/Build/Intermediates.noindex/RealmReact.build/Debug-iphoneos/RealmReact.build/Objects-normal/arm64/RealmAnalytics.dia -c /Users/jackyao/ReactNative/individualmanagement/node_modules/realm/react-native/ios/RealmReact/RealmAnalytics.mm -o /Users/jackyao/Library/Developer/Xcode/DerivedData/IndividualManagement-bydmeqfaqklessatftyybnsyykds/Build/Intermediates.noindex/RealmReact.build/Debug-iphoneos/RealmReact.build/Objects-normal/arm64/RealmAnalytics.o
In file included from /Users/jackyao/ReactNative/individualmanagement/node_modules/realm/react-native/ios/RealmReact/RealmAnalytics.mm:57:
In file included from /Users/jackyao/ReactNative/individualmanagement/node_modules/realm/react-native/ios/RealmReact/RealmAnalytics.h:57:
In file included from /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS13.2.sdk/System/Library/Frameworks/Foundation.framework/Headers/Foundation.h:6:
In file included from /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS13.2.sdk/System/Library/Frameworks/CoreFoundation.framework/Headers/CoreFoundation.h:18:
In file included from /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS13.2.sdk/usr/include/assert.h:44:
In file included from ../../../../ios/Pods/Headers/Public/Flipper-Folly/folly/portability/stdlib.h:19:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cstdlib:101:9: error: no member named 'div_t' in the global namespace; did you mean 'dev_t'?
using ::div_t;
~~^
In file included from /Users/jackyao/ReactNative/individualmanagement/node_modules/realm/react-native/ios/RealmReact/RealmAnalytics.mm:57:
In file included from /Users/jackyao/ReactNative/individualmanagement/node_modules/realm/react-native/ios/RealmReact/RealmAnalytics.h:57:
In file included from /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS13.2.sdk/System/Library/Frameworks/Foundation.framework/Headers/Foundation.h:6:
In file included from /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS13.2.sdk/System/Library/Frameworks/CoreFoundation.framework/Headers/CoreFoundation.h:16:
In file included from /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS13.2.sdk/usr/include/sys/types.h:103:
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS13.2.sdk/usr/include/sys/_types/_dev_t.h:31:31: note: 'dev_t' declared here
typedef __darwin_dev_t dev_t; /* device number /
^
In file included from /Users/jackyao/ReactNative/individualmanagement/node_modules/realm/react-native/ios/RealmReact/RealmAnalytics.mm:57:
In file included from /Users/jackyao/ReactNative/individualmanagement/node_modules/realm/react-native/ios/RealmReact/RealmAnalytics.h:57:
In file included from /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS13.2.sdk/System/Library/Frameworks/Foundation.framework/Headers/Foundation.h:6:
In file included from /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS13.2.sdk/System/Library/Frameworks/CoreFoundation.framework/Headers/CoreFoundation.h:18:
In file included from /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS13.2.sdk/usr/include/assert.h:44:
In file included from ../../../../ios/Pods/Headers/Public/Flipper-Folly/folly/portability/stdlib.h:19:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cstdlib:102:9: error: no member named 'ldiv_t' in the global namespace; did you mean 'dev_t'?
using ::ldiv_t;
~~^
In file included from /Users/jackyao/ReactNative/individualmanagement/node_modules/realm/react-native/ios/RealmReact/RealmAnalytics.mm:57:
In file included from /Users/jackyao/ReactNative/individualmanagement/node_modules/realm/react-native/ios/RealmReact/RealmAnalytics.h:57:
In file included from /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS13.2.sdk/System/Library/Frameworks/Foundation.framework/Headers/Foundation.h:6:
In file included from /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS13.2.sdk/System/Library/Frameworks/CoreFoundation.framework/Headers/CoreFoundation.h:16:
In file included from /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS13.2.sdk/usr/include/sys/types.h:103:
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS13.2.sdk/usr/include/sys/_types/_dev_t.h:31:31: note: 'dev_t' declared here
typedef __darwin_dev_t dev_t; / device number */
^
In file included from /Users/jackyao/ReactNative/individualmanagement/node_modules/realm/react-native/ios/RealmReact/RealmAnalytics.mm:57:
In file included from /Users/jackyao/ReactNative/individualmanagement/node_modules/realm/react-native/ios/RealmReact/RealmAnalytics.h:57:
In file included from /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS13.2.sdk/System/Library/Frameworks/Foundation.framework/Headers/Foundation.h:6:
In file included from /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS13.2.sdk/System/Library/Frameworks/CoreFoundation.framework/Headers/CoreFoundation.h:18:
In file included from /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS13.2.sdk/usr/include/assert.h:44:
In file included from ../../../../ios/Pods/Headers/Public/Flipper-Folly/folly/portability/stdlib.h:19:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cstdlib:104:9: error: no member named 'lldiv_t' in the global namespace
using ::lldiv_t;
~~^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cstdlib:106:9: error: no member named 'atof' in the global namespace
using ::atof;
~~^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cstdlib:107:9: error: no member named 'atoi' in the global namespace
using ::atoi;
~~^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cstdlib:108:9: error: no member named 'atol' in the global namespace
using ::atol;
~~^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cstdlib:110:9: error: no member named 'atoll' in the global namespace
using ::atoll;
~~^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cstdlib:112:9: error: no member named 'strtod' in the global namespace
using ::strtod;
~~^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cstdlib:113:9: error: no member named 'strtof' in the global namespace
using ::strtof;
~~^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cstdlib:114:9: error: no member named 'strtold' in the global namespace
using ::strtold;
~~^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cstdlib:115:9: error: no member named 'strtol' in the global namespace
using ::strtol;
~~^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cstdlib:117:9: error: no member named 'strtoll' in the global namespace
using ::strtoll;
~~^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cstdlib:119:9: error: no member named 'strtoul' in the global namespace
using ::strtoul;
~~^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cstdlib:121:9: error: no member named 'strtoull' in the global namespace
using ::strtoull;
~~^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cstdlib:126:9: error: no member named 'rand' in the global namespace
using ::rand;
~~^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cstdlib:127:9: error: no member named 'srand' in the global namespace
using ::srand;
~~^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cstdlib:128:9: error: no member named 'calloc' in the global namespace
using ::calloc;
~~^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cstdlib:129:9: error: no member named 'free' in the global namespace
using ::free;
~~^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/cstdlib:130:9: error: no member named 'malloc' in the global namespace
using ::malloc;
~~^
fatal error: too many errors emitted, stopping now [-ferror-limit=]
20 errors generated.
`
and this is the Xcode screenshot when I click one of the errors above

I am not familiar with Xcode and c++, but these errors seem to be related to c++ headers? or some search header path conflict?
I am not sure if I am right, I found that the file path of the header file 'stdlib.h' included by cstdlib is '/ios/Pods/Flipper-Folly/folly/portability/Stdlib.h' ,should it be 'Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/stdlib.h' ?
If this is the problem, how to fix it?
here are the 'Header Search Path' of RealmReact project:

$(inherited)
$(SRCROOT)/../../src
$(SRCROOT)/../../src/object-store/src
$(SRCROOT)/../../src/object-store/external/json
$(SRCROOT)/../../vendor
$(SRCROOT)/../../vendor/realm-ios/include
$(SRCROOT)/../../vendor/GCDWebServer/GCDWebServer/**
$(SRCROOT)/../../../react-native/React/**
$(SRCROOT)/../../../../ios/Pods/Headers/Public/**
$(SRCROOT)/../../tests/react-test-app/ios/Pods/Headers/Public/React $(SRCROOT)/../../examples/ReactExample/node_modules/react-native/React/**
I tried to change some of the paths aimlessly but have not luck馃槴
it's not an issue about realm, but about react native upgrade. so I will close it.