Just tried compiling, without NOWERROR=1, with Xcode 12.0, and got the same error.

About to try again with NOWERROR=1...

Stand by...

[Time Passes...]


MAME 0.224, 8/26/20, newly uncompressed source
Xcode 12.0 (9/17/20)
MacOS 10.15.6
iMac (Retina 5K, 27-inch, 2019)
3.1 GHz 6-Core Intel Core i5
Radeon Pro 575X 4 GB

The following statement is true...
The preceding statement is false.