Objc interop: _OBJC_CLASS_ is not generated when using target arm64-apple-ios12 and accessing ios15 code

Development Compiler
,
1

Hello,

have found a weird behaviour of compiler when targeting arm64-apple-ios12, OBJC_CLASS data is not being generated for classes that includes members from high ios versions.
Minimal code to reproduce:

import Foundation
import StoreKit

@available(iOS 15.0, *)
@objc(RvmProduct_PurchaseOption) public class RvmProduct_PurchaseOption: NSObject  {
     let raw: Product.PurchaseOption
     init(raw: Product.PurchaseOption) {
        self.raw = raw 
     }
}

and command lines to check:

swiftc -c test.swift -sdk `xcrun --sdk iphoneos --show-sdk-path` -target arm64-apple-ios12 -o arm64-iphone-12.o 
swiftc -c test.swift -sdk `xcrun --sdk iphoneos --show-sdk-path` -target arm64-apple-ios13 -o arm64-iphone-13.o 
swiftc -c test.swift -sdk `xcrun --sdk iphonesimulator --show-sdk-path` -target arm64-apple-ios12.0-simulator -o arm64-sim.o
nm ./arm64-iphone-12.o | grep _OBJC_CLASS_  
nm ./arm64-iphone-13.o | grep _OBJC_CLASS_  
                 U _OBJC_CLASS_$_NSObject
0000000000001758 S _OBJC_CLASS_$_RvmProduct_PurchaseOption
nm ./arm64-sim.o | grep _OBJC_CLASS_  
                 U _OBJC_CLASS_$_NSObject
0000000000001728 S _OBJC_CLASS_$_RvmProduct_PurchaseOption

-target arm64-apple-ios12.0-simulator, -target arm64-apple-ios13 produce objc class data. but -target arm64-apple-ios12 – doesn’t.

Environment: XCode 16.4 & Apple Swift version 6.1.2 (swiftlang-6.1.2.1.2 clang-1700.0.13.5)

Anything specific I miss here ?

Thank you