Macro compilation issue in modularized project

[gyulavoros]

Description

I'm looking for guidance on how to integrate TCA with multiple feature modules.

Given that multiple framework targets depend on TCA, project compilation breaks with the following Xcode error:

External macro implementation type 'PerceptionMacros.PerceptibleMacro' could not be found for macro 'Perceptible()'

Project setup:

• Vanilla Xcode project, or xcodeproj generated via XcodeGen
• TCA is added as SPM dependency
• Two framework targets + one app target
• Both framework targets depend on TCA (this breaks macro compilation)
• App target depends on both framework targets

|-- App
|---- FeatureA
|------ TCA
|---- FeatureB
|------ TCA

This setup used to work with older TCA versions (1.11.2 and prior). I have limited knowledge of macro internals and having a hard time to pinpoint what the issue is.

Checklist

• [X] I have determined whether this bug is also reproducible in a vanilla SwiftUI project.
• [X] If possible, I've reproduced the issue using the main branch of this package.
• [X] This issue hasn't been addressed in an existing GitHub issue or discussion.

Expected behavior

The project compiles.

Actual behavior

Compilation fails with:

External macro implementation type 'PerceptionMacros.PerceptibleMacro' could not be found for macro 'Perceptible()'

Steps to reproduce

I attached a minimal example demonstrating the issue: ModularizedMacroIssue.zip

The Composable Architecture version information

1.13.0

Destination operating system

iOS 17.5

Xcode version information

Xcode 15.4 (15F31d)

Swift Compiler version information

swift-driver version: 1.90.11.1 Apple Swift version 5.10 (swiftlang-5.10.0.13 clang-1500.3.9.4)
Target: arm64-apple-macosx14.0

[mbrandonw]

Hi @gyulavoros, this is not an issue with the library per se, and instead most likely an issue with how your project is set up in Xcode. I am going to convert this to a discussion and perhaps someone can help you out over there.