Simon Jarbrant
Matt MassicotteI got a little excited about package trait support in Xcode 26.4. So I did some experimenting and ... I think it's great!
Jason Gregori 
@mattiem I was going to ask you what this is earlier but glad I waited until this scrolled onto screen :). Thanks!
calicoding@mattiem where do you specify which traits you want to use in Xcode? When you configure the package dependency?
@calicoding yes! Xcodes package management UI now has a new column that lets you control traits for packages that support them.
Scott Berrevoets@mattiem in your first example, how is the FancyStructures trait enabled? I get the conditional dependency but not immediately clear what controls the condition
@ScottBerrevoets it is under the control of the package consumer. In Xcode, there's a UI to enable/disable traits for packages that support them. You can also do so programmatically via a Package.swift file if you aren't using Xcode.
@mattiem ah excellent. Thanks for the write up!
@ScottBerrevoets thanks for the feedback! I should clarify this, you aren’t the first to ask.
James@mattiem well possible I’m holding it wrong. Looks like Xcode enables the default traits for a package even if they’re not selected in the UI. Did you have any issues with that?
@JamesTech I don’t think so. It certainly seemed like I was able to turn off all traits it if I wanted to. But I only played with it for like 30 mins…
@mattiem strange, I did some more playing and I’m pretty sure I’m seeing something not right. I got the same thing happening with just two Swift packages. One with traits that are enabled by default and another that depends on it but disabling the traits. If I run with swift run works like I’d expect. Run it in Xcode though and the traits are enabled. Got a post on the dev forums, hopefully someone knows what’s up or at least what I’m doing wrong😅