Getting 'no such module' error when importing a Swift Package Manager dependency

I'm running Xcode 11 Beta 4. I'm using CocoaPods, and wanted to use one of my dependencies with Swift Package Manager as a static library instead of as a framework. On a fresh project created with Xcode 11, the dependency can be imported successfully, but on my existing CocoaPods workspace, it does not.

I think it's likely related, but I'm also getting this link warning in Xcode:

directory not found for option '-L/Users/username/Library/Developer/Xcode/DerivedData/App-axanznliwntexmdfdskitsxlfypz/Build/Products/Release-iphoneos

I went to see if the directory exists after the warning is emitted, and it does. I could not find any meaningful difference between the newly-created project and my old one, other than the existence of CocoaPods.

Would appreciate any pointers.

After adding a library (FASwiftUI in my case) through Swift Package Manager I had to add it to

Project Settings -> General -> My Target -> Frameworks, Libraries, and Embedded Content

to be visible in the import statement.

I did not add any scripts for it to work.

Based on @AlexandreMorgado answer it seems like it is better to run this script in Build phases before Compile Sources. Then it works when archiving.

if [ -d "${SYMROOT}/Release${EFFECTIVE_PLATFORM_NAME}/" ] && [ "${SYMROOT}/Release${EFFECTIVE_PLATFORM_NAME}/" != "${SYMROOT}/${CONFIGURATION}${EFFECTIVE_PLATFORM_NAME}/" ] 
then
  cp -f -R "${SYMROOT}/Release${EFFECTIVE_PLATFORM_NAME}/" "${SYMROOT}/${CONFIGURATION}${EFFECTIVE_PLATFORM_NAME}/"
fi

It turned out that Swift Package Manager implicitly depends on the project's Configuration names. I had them at live/qa instead of Release/Debug, and changing them back resolved the issue. Very odd, but I hope it saves you some trouble dear reader.

After a whole week fighting this issue, I developed a workaround using schemes and pre-actions.

I have a configuration called "Beta", so Xcode can't compile SPM dependencies. I realised Xcode compile SPM dependencies as Swift modules and add the files in Build/Products/Release-iphoneos folder in DeriverData.

So I created a scheme in Xcode and added this run script on build pre-actions:

cp -f -R "${SYMROOT}/Release${EFFECTIVE_PLATFORM_NAME}/" "${SYMROOT}/${CONFIGURATION}${EFFECTIVE_PLATFORM_NAME}/"

This script run before the build process, coping files and modules generated by Xcode on default Release-iphoneos folder to configuration folder, Beta-iphoneos, in my case.

After coping the content from Release-iphoneos to your $configuration$-iphoneos folder Xcode should correctly compile, build and run your project.

I'm developing a Swift package that must provide FontAwesome Icons to whoever imports it.

I was getting "No such module 'FASwiftUI'" in my SwiftUI preview canvas.

I solved it by adding "FASwiftUI" to the dependencies array in the package file like so:

// swift-tools-version:5.3
// The swift-tools-version declares the minimum version of Swift required to build this package.

import PackageDescription

let package = Package(
    name: "PackageName",
    platforms: [
        .macOS(.v11),
        .iOS(.v14)
    ],
    products: [
        // Products define the executables and libraries a package produces, and make them visible to other packages.
        .library(
            name: "PackageName",
            targets: ["PackageName"])
    ],
    dependencies: [
        // Dependencies declare other packages that this package depends on.
        .package(url: "https://github.com/nalexn/ViewInspector", from: "0.8.1"),
        .package(url: "https://github.com/mattmaddux/FASwiftUI", from: "1.0.4")
    ],
    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: "PackageName",
            dependencies: ["FASwiftUI"], // <<<--------- Added this here
            resources: [
                .process("Assets")
            ]
        ),
        .testTarget(
            name: "PackageNameTests",
            dependencies: ["PackageName", "ViewInspector"])
    ]
)