The following build commands failed: CompileC /directory_path/ios/build/Build/Intermediates/React.build/Debug-iphonesimulator/React.build/Objects-normal/x86_64/RCTFont.o Views/RCTFont.mm normal x86_64 objective-c++ com.apple.compilers.llvm.clang.1_0.compi

https://blog.nomnel.net/posts/build-failed-because-of-older-version-of-xcode に移転しました。