What does warning “Mapping architecture arm64 to x86_64” mean?

Question

After migrating my framework to Xcode 10 beta (10L176w) I started to get warnings like:

Mapping architecture arm64 to x86_64. Ensure that this target\

Answer 1

The solution is simpler: in Valid Architectures just replace arm64 with x86_64.

Had similar issue and the following three warnings in my project:

My Valid Archtectures originally were

Replacing:

• armv7 with i386,
• armv7s with i386,
• and, arm64 with x86_64

(as mentioned in the Warnings) was my solution. The result in the Valid Architecture setting was:

After the replacements my three warnings above disappeared.

More profound info about the Architectures can be found here: https://docs.elementscompiler.com/Platforms/Cocoa/CpuArchitectures/

I think the formulation of this warning in Xcode is a bit confusion.