Swift 4/5 compatibility

[JetForMe]

Please help prevent duplicate issues before submitting a new one:

• I've searched other open/closed issues for duplicates before opening up this new issue.

Report

I'm trying to use Carthage to include Down in my Xcode 10.2/Swift 5 project. But the Down project specifies Swift 4, and I get incompatibility errors when trying to compile/link against it.

What did you do?

Created a new Swift 5 project. Set up Carthage to include Down. Compiled, got an error "The following binaries use incompatible versions of Swift:" referencing my app and the Down framework.

What did you expect to happen?

This is going to be tricky, isn't it? I need to be able to compile dependencies with Swift 5 via Carthage. I tried modifying the project, and it builds and the tests pass, but if I update with Carthage it reverts to Swift 4.

What happened instead?

if I update with Carthage it reverts to Swift 4. Need a version that bumps the Swift version, but there's a backward-compatibility issue.

[iwasrobbed]

I don't use Carthage but I imagine if we just bump to Swift 5 with whatever changes that ensues, then others can just use an older tag if they still need Swift 4 or below, no?

…

On Wed, Apr 3, 2019, 6:11 PM Rick M ***@***.***> wrote: Please help prevent duplicate issues before submitting a new one: - I've searched other open/closed issues for duplicates before opening up this new issue. Report I'm trying to use Carthage to include Down in my Xcode 10.2/Swift 5 project. But the Down project specifies Swift 4, and I get incompatibility errors when trying to compile/link against it. What did you do? Created a new Swift 5 project. Set up Carthage to include Down. Compiled, got an error "The following binaries use incompatible versions of Swift:" referencing my app and the Down framework. What did you expect to happen? This is going to be tricky, isn't it? I need to be able to compile dependencies with Swift 5 via Carthage. I tried modifying the project, and it builds and the tests pass, but if I update with Carthage it reverts to Swift 4. What happened instead? if I update with Carthage it reverts to Swift 4. Need a version that bumps the Swift version, but there's a backward-compatibility issue. — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#131>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AATY57ak31ee0PGN-91v6XRejWsJd_lwks5vdScngaJpZM4cbits> .

[JetForMe]

For sure, until they need features or bugfixes you offer but need pre-Swift-5 compatibility. I'm all for staying on the bleeding edge, but I think this is a problem that's going to affect a lot of Carthage projects (or really, any project that uses third-party libraries).

[JetForMe]

I'm conflating the Swift 5 compiler version with the selected language dialect. All we need is to use the Swift 5 compiler; we don't need to change the setting inside the Xcode project. So, building from source via Carthage should work just fine, once everything is set up properly.

[iwasrobbed]

Updating to Swift 5.0 in #145