MacCatalyst support

[innoreq]

I experience a Catalyst problem - is there a solution or workaround?

Expected behavior

I expected the library to work also in a combined iOS/macOS project (Catalyst).

Actual behavior

I created a lightweight wrapper around the lib and put it into a "Log" Swift Package.
For "import Logging", the compiler tells:
"Logging is not available when building for Mac Catalyst. Consider using #if !targetEnvironment(macCatalyst) to conditionally import this framework."

SwiftLog version/commit hash

The Package.swift content for the Log wrapper:

import PackageDescription

let package = Package(
    name: "Log",
    products: [
        // Products define the executables and libraries produced by a package, and make them visible to other packages.
        .library(
            name: "Log",
            targets: ["Log"]),
    ],
    dependencies: [
        // Dependencies declare other packages that this package depends on.
        // .package(url: /* package url */, from: "1.0.0"),
		.package(url: "https://github.com/apple/swift-log.git", from: "1.0.0"),
    ],
    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 which this package depends on.
        .target(
            name: "Log",
            dependencies: []),
        .testTarget(
            name: "LogTests",
            dependencies: ["Log"]),
    ]
)

Swift & OS version (output of swift --version && uname -a)

Xcode 11.0 (11A419c) / Swift 5 / macOS 10.15 / iOS 13.0

[weissi]

I think this is an SDK bug in Xcode unfortunately. Please file a Feedback Request for this.

[weissi]

If that turns out to be true, then it's good that it's "just" and SDK bug because SDK bugs can be fixed by using a newer Xcode release, I don't think the bug is in the OS itself (which would be a bigger issue).

[weissi]

@innoreq yes, I think the issue is the presence of those:

$ find /Applications/Xcode.app/ -name 'Logging.framework' -type d
/Applications/Xcode.app//Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/System/Library/Frameworks/Logging.framework
/Applications/Xcode.app//Contents/Developer/Platforms/WatchOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/watchOS.simruntime/Contents/Resources/RuntimeRoot/System/Library/Frameworks/Logging.framework
/Applications/Xcode.app//Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/System/Library/Frameworks/Logging.framework

despite the fact that they don't actually exist on the OSes if I'm not mistaken. I don't think Logging.framework should actually be part of any SDKs but clearly they are in Xcode 11.0.

[weissi]

@innoreq hmm, actually, I just tried that and it works just fine for me. See the gif below where I create an iOS app with swift-log which I then use for Catalyst just fine:

[weissi]

@innoreq I would suggest to start with a normal Xcode app project and to then add the swift-log dependency through File -> Swift Packages -> Add Package Dependency. Like this:

[weissi]

@innoreq is this still an issue?

[weissi]

I think this is done.