Fixed an issue where the SPM package doesn't compile with Xcode 11.4

[akmarinov]

After updating to Xcode 11.4, my project is showing the following issue with RxBluetoothKit:

xcodebuild: error: Could not resolve package dependencies:
   target at '/Users/xcode/Library/Developer/Xcode/DerivedData/project-btxgpemzyyretjcousmtwoebmywz/SourcePackages/checkouts/RxBluetoothKit' contains mixed language source files; feature not supported

I've been able to track down the error to the Info.plist file in the Sources folder.

For whatever reason, Xcode 11.4 now doesn't like that there's a file that's not a .swift one. (Xcode 11.3.1 still works fine)

I've included that file in the excluded section in the package description, which solves the issue.

[DevAndArtist]

@akmarinov are you sure it's only Info.plist? The Sources folder does also contain RxBluetoothKit.h. I'd say SPM would still consider this as mixed languages. We should exclude this file as well, just in case.

This PR would resolve: #368

[akmarinov]

Well, Xcode works in mysterious ways, as the ObjC compatibility header doesn't seem to be an issue in my case.

// swift-tools-version:5.1
// The swift-tools-version declares the minimum version of Swift required to build this package.

import PackageDescription

let package = Package(
    name: "TestProject",
    platforms: [
        .iOS("12.4")
    ],
    products: [
        // Products define the executables and libraries produced by a package, and make them visible to other packages.
        .library(
            name: "TestProject",
            targets: ["TestProject"]),
    ],
    dependencies: [
        .package(url: "https://github.com/akmarinov/RxBluetoothKit.git", from: "5.3.1"),
        .package(url: "https://github.com/ReactiveX/RxSwift.git", from: "5.1.0")
    ],
    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: "TestProject",
            dependencies: ["RxBluetoothKit", "RxSwift"],
            path: "Sources")
    ]
)

These package dependencies in a test project work without Xcode showing the issue for me, with the RxBluetoothKit.h included.

I'm not sure what the impact of turning off the compatibility header would be for ObjC projects, but excluding it in the SPM package shouldn't be an issue.

[DevAndArtist]

excluding it in the SPM package shouldn't be an issue

That's my whole point. :)

[CLAassistant]

All committers have signed the CLA.

[tomovicn]

This fixes an issue.

[tomovicn]

@DevAndArtist can you approve this pull request? Or who should we ping?
This is a blocker for all of us who use SPM.

[DevAndArtist]

@tomovicn I'm just a contributor to the framework (I added some changes to the logging stuff in the past), but not part of Polidea so I can't really approve the PR. Personally I consider this framework as dead and will try to get rid of its dependency in our projects.

Your best chances right now are to fork the project and merge this PR in your fork and re-route the dependencies.

[tomovicn]

It's a shame since it is a very good library. I dropped them a message to see if they still support this project.
Thanks for your response @DevAndArtist