Undefined symbols for architecture arm64 (protocol witness table)

[tayloraswift]

Description

compiling this test project: https://github.com/tayloraswift/swift-mongodb-test

produces an error resembling the following:

Undefined symbols for architecture arm64:
  "protocol witness table for (extension in MongoQL):Mongo.Mongo.Create<A> : (extension in MongoCommands):Mongo.Mongo.Command in MongoQL", referenced from:

ld: symbol(s) not found for architecture arm64

this was also discussed on slack here: https://app.slack.com/client/T5FT3K01G/C5FAE2LL9

this seems to be closely related to setting a platform minimum of .macOS(.v15) in Package.swift, and never seems to happen on Linux.

Reproduction

git clone https://github.com/tayloraswift/swift-mongodb-test 
cd swift-mongodb-test 
swift build

Expected behavior

it should compile successfully

Environment

Swift 6.0 that comes with the latest Xcode on macOS 15.0.1 Sequoia

Additional information

No response

[weissi]

probably related to #76384

[DougGregor]

This was fixed by #76384