The build fails when setting the support platform to macOS 15

[omochi]

Is it reproducible with SwiftPM command-line tools: swift build, swift test, swift package etc?

• Confirmed reproduction steps with SwiftPM CLI. The description text must include reproduction steps with either of command-line SwiftPM commands, swift build, swift test, swift package etc.

Description

When setting the support platform to macOS 15, the build fails.

The following SwiftPM project has a simple structure that just uses a code generation plugin called SotoCode Generator.

https://github.com/omochi/swiftpm-mac15-bug

However, the following error occurs, and the build cannot be completed:

error: link command failed with exit code 1 (use -v to see invocation)
Undefined symbols for architecture arm64:
  "protocol witness table for SotoCore.JMESPathMatcher<A> : SotoCore.AWSWaiterMatcher in SotoCore", referenced from:
      (1) suspend resume partial function for Soto.EC2.waitUntilImageExists(_: Soto.EC2.DescribeImagesRequest, maxWaitTime: NIOCore.TimeAmount?, logger: Logging.Logger) async throws -> () in ec2_api.swift.o
      (1) suspend resume partial function for Soto.EC2.waitUntilInstanceExists(_: Soto.EC2.DescribeInstancesRequest, maxWaitTime: NIOCore.TimeAmount?, logger: Logging.Logger) async throws -> () in ec2_api.swift.o
      (1) suspend resume partial function for Soto.EC2.waitUntilInternetGatewayExists(_: Soto.EC2.DescribeInternetGatewaysRequest, maxWaitTime: NIOCore.TimeAmount?, logger: Logging.Logger) async throws -> () in ec2_api.swift.o
      (1) suspend resume partial function for Soto.EC2.waitUntilKeyPairExists(_: Soto.EC2.DescribeKeyPairsRequest, maxWaitTime: NIOCore.TimeAmount?, logger: Logging.Logger) async throws -> () in ec2_api.swift.o
      (1) suspend resume partial function for Soto.EC2.waitUntilPasswordDataAvailable(_: Soto.EC2.GetPasswordDataRequest, maxWaitTime: NIOCore.TimeAmount?, logger: Logging.Logger) async throws -> () in ec2_api.swift.o
      (1) suspend resume partial function for Soto.EC2.waitUntilSecurityGroupExists(_: Soto.EC2.DescribeSecurityGroupsRequest, maxWaitTime: NIOCore.TimeAmount?, logger: Logging.Logger) async throws -> () in ec2_api.swift.o
      (1) suspend resume partial function for Soto.ECS.waitUntilServicesStable(_: Soto.ECS.DescribeServicesRequest, maxWaitTime: NIOCore.TimeAmount?, logger: Logging.Logger) async throws -> () in ecs_api.swift.o
      ...

This is because the support platform is set to macOS 15 or later as follows:

    platforms: [.macOS(.v15)],

Curiously, when loosening this to macOS 14 or later, the build succeeds.

    platforms: [.macOS(.v14)],

Expected behavior

Build succeeds.

Actual behavior

Build fails with linker error.

Steps to reproduce

$ git clone https://github.com/omochi/swiftpm-mac15-bug
$ cd swiftpm-mac15-bug
$ swift build
...
error: link command failed with exit code 1 (use -v to see invocation)
...
$ vim Package.swift # change to macOS 14
$ swift build
...
Build complete! (80.98s)

Swift Package Manager version/commit hash

Swift Package Manager - Swift 6.0.0-dev

Swift & OS version (output of swift --version ; uname -a)

$ swift --version
swift-driver version: 1.115 Apple Swift version 6.0 (swiftlang-6.0.0.9.10 clang-1600.0.26.2)
Target: arm64-apple-macosx15.0
$ uname -a
Darwin omochi-mbp.local 24.1.0 Darwin Kernel Version 24.1.0: Mon Sep  2 20:00:14 PDT 2024; root:xnu-11215.40.48~33/RELEASE_ARM64_T6020 arm64