Xcode build reports "no such module" for Swift Package Manager packages. Building again and again eventually fixes it – Ios swift

I get "no such module" errors when trying to build after doing a "Clean Build Folder". Repeatedly trying to build eventually results in no errors.

IMPORTANT: The modules that can not be found are local packages with Swift Package Manager, i.e. not downloaded from git. I’m specifying these dependencies like this:

.package(url: "file:../CoreGraphicsExtensions", from: "0.0.0")

As seen in my /UIKitExtensions/Package.swift file listed here:

// swift-tools-version: 5.6
// The swift-tools-version declares the minimum version of Swift required to build this package.

import PackageDescription

let package = Package(
        name: "UIKitExtensions",
        products: [
            // Products define the executables and libraries a package produces, and make them visible to other packages.
            .library(
                    name: "UIKitExtensions",
                    targets: ["UIKitExtensions"]),
        ],
        dependencies: [
            // Dependencies declare other packages that this package depends on.
            // .package(url: /* package url */, from: "1.0.0"),
            .package(url: "file:../CoreGraphicsExtensions", from: "0.0.0")
        ],
        targets: [
            // Targets are the basic building blocks of a package. A target can define a module or a test suite.
            // Targets can depend on other targets in this package, and on products in packages this package depends on.
            .target(
                    name: "UIKitExtensions",
                    dependencies: []),
            .testTarget(
                    name: "UIKitExtensionsTests",
                    dependencies: ["UIKitExtensions"]),
        ]
)

Here is what I see in Xcode when I am trying to build.

First build…

Second Build…

Third Build…

Fourth Build…

Fifth Build…

… finally it runs. 🥳

But there are some strange warnings about the packages not being used by any target.

How can I get this to build correctly first time after a clean build?

My workspace structure looks like this…

Two projects in the workspace. BlenderViewer has the target I’m building. BlenderViewer has 6 local SPM packages. It also imports the PhyKit project as a framework, no problems there. The SPM packages have some dependencies between each other, but nothing circular.

Everything looks fine to me…

I’m running MacOS 12.5. Xcode 13.4.1. Building for iOS 15.3.

Am I doing something wrong here?