Duplicate symbols for architecture x86_64 under Xcode

75 duplicate symbols for architecture x86_64

Means that you have loaded same functions twice. As the issue disappear after removing -ObjC from Other Linker Flags, this means that this option result that functions loads twice:

from Technical Q&A

This flag causes the linker to load every object file in the library that defines an Objective-C class or category. While this option will typically result in a larger executable (due to additional object code loaded into the application), it will allow the successful creation of effective Objective-C static libraries that contain categories on existing classes.

https://developer.apple.com/library/content/qa/qa1490/_index.html

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