I'm experiencing the same fatal compile error with iOS 18 RC and Xcode 16 RC:
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator18.0.sdk/usr/include/c++/v1/__type_traits/is_integral.h:53:29 'std::is_integral<double>' has different definitions in different modules; definition in module 'std_private_type_traits_is_integral' is here
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS18.0.sdk/usr/include/c++/v1/__type_traits/is_integral.h:53:29 'std::is_integral<double>' has different definitions in different modules; definition in module 'std_private_type_traits_is_integral' is here
I don't know how to resolve this since the issue involves the is_integral.h file which is part of the Foundation include. This appears to be an Xcode 16 bug.
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Developer Tools & Services
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Xcode
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