"Undefined symbol" error on project using Package with TCA dependency

[WedgeSparda]

Hi, I'm migrating our base code, formed by different local Frameworks into local Packages. Until now I was able to transform the bottom layer framework (with some Foundation extension and helpers, let's called MyFoundation) without problem.

Now I'm working on the next layer called MyCore, a framework which has MyFoundation as a local dependency, and also some remote dependencies, like ComposableArchitecture.

I managed to create the MyCore package and it compiles without problem. This is the Package.swift, as you can see I'm using prerelease/1.0

import PackageDescription

let package = Package(
    name: "MyCore",
    defaultLocalization: "en",
    platforms: [
        .iOS(.v14),
        .watchOS(.v7)
    ],
    products: [
        .library(
            name: "MyCore",
            targets: [
                "MyCore",
                "MyCoreMocks"
            ]
        )
    ],
    dependencies: [
        .package(path: "../MyFoundation"),
        .package(url: "https://github.com/pointfreeco/swift-composable-architecture", branch: "prerelease/1.0"),
        // ... more external packages
    ],
    targets: [
        .target(
            name: "MyCore",
            dependencies: [
                .product(name: "MyFoundation", package: "MyFoundation"),
                .product(name: "ComposableArchitecture", package: "swift-composable-architecture"),
               // ... more dependencies from external packages
            ]
        ),
        .target(
            name: "MyCoreMocks",
            dependencies: ["MyCore"]
        )
    ]
)

As I said MyCore compiles without problem, but problem comes when I compile any of the frameworks using the MyCore package as dependency. I'm getting this errors:

Undefined symbols for architecture arm64:
  "_$s12Dependencies10DependencyV12wrappedValuexvg", referenced from:
      (...)
  "_$s12Dependencies10DependencyVMn", referenced from:
      (...)
  "_$s12Dependencies10DependencyV_4file0C2ID4lineACyxGs7KeyPathCyAA0B6ValuesVxG_s12StaticStringVANSutcfC", referenced from: 
      (...)
  "_$s12Dependencies13DependencyKeyMp", referenced from:
      (...)
  "_$s12Dependencies16DependencyValuesVMn", referenced from:
      _symbolic _____ 12Dependencies16DependencyValuesV in CabiCore.o
  "_$s12Dependencies16DependencyValuesVy5ValueQzxm_s12StaticStringVAGSutcAA04TestB3KeyRzluig", referenced from:
      (...)
  "_$s12Dependencies16DependencyValuesVy5ValueQzxm_s12StaticStringVAGSutcAA04TestB3KeyRzluis", referenced from:
      (...)
  "_$s12Dependencies17TestDependencyKeyMp", referenced from:
     (...)
ld: symbol(s) not found for architecture arm64

All the lines on the referenced from are from types using the @Dependency annotation, obviously.

I'm not sure why is this happening. I tried linking ComposableArchitecture to the frameworks using MyCore but didn't work.

What I'm missing?

Thanks for your time.

[mbrandonw]

Hi @WedgeSparda, I'm not sure how to diagnose this without a project that reproduces the problem. Can you try creating a project from scratch that mimics your project's structure, and see if it still happens?

[WedgeSparda]

Hi @mbrandonw I managed to create this demo project

https://github.com/WedgeSparda/TestSPMDependencyError

But for that project everything is working as expected. Maybe there is some build setting on my main project causing this issue but not sure which one yet. Anyway, in this demo project you can see basically whay I'm trying to do in my main project.

[mbrandonw]

Yeah hard to say. It does sound like something may be misconfigured in your other project.

[StefanCosminR]

This happened a few times for me as well, but it was just an Xcode / Swift bug in my case. Cleaning the build folder always fixes the problem

[WedgeSparda]

@StefanCosminR I tried that too, with no luck