[SR-15196] Binary target required for compilation despite being a conditional dependency

[swift-ci]

Previous ID	SR-15196
Radar	rdar://problem/83153139
Original Reporter	gbrhaz (JIRA User)
Type	Bug

Environment

Xcode 12.5.1

Xcode 13.0 beta 5

Additional Detail from JIRA

Votes	4
Component/s	Package Manager
Labels	Bug
Assignee	None
Priority	Medium

md5: 923498cd24ed244edda804515f08d0dd

is duplicated by:

• SR-15836 Platform Conditionals Don't Apply To Binary Frameworks

Issue Description:

SPM has recently introduced conditional dependencies and binary targets (for xcframeworks). The two do not align, however. A binary dependency that is supported only on one platform is still linked on unsupported platforms.

I have created a repository here that I think showcases the issue:

https://github.com/gbrhaz/spm-binary-conditional

In the repository I have added the GoogleCast frameworks into an xcframework. Since GoogleCast is only supported for iOS, the xcframework supports architectures for iOS and x64 Simulator.

I want to depend on GoogleCast - but only for iOS platform, not for tvOS.

In the above repository I have also added a source-only dependency that can showcase how conditional dependencies do work for source-only frameworks. It appears to only be binary dependencies that cause issues.

[typesanitizer]

@swift-ci create