ios - iphone, xcode, valid architectures importance -

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i know thew importance of setting valid architectues ( armv7, armvs ) in xcode projects? @ level of sdk become important? coredata? caching issue? not trying diminish understand reason exists.

according xcode buid setting reference

specifies architectures binary may built. during build, list intersected value of archs build setting; resulting list specifies architectures binary can run on. if resulting architecture list empty, target generates no binary.


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