Compiling Swift Package with Dependency on Build Tool Plugin Fails in Xcode 26

Developer Tools & Services Xcode
Kai E
Kai E OP
Created 1w
Replies 2
Boosts 3
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Participants 3

Hi,

in our Xcode project we have a Tooling package, which defines build tool plugins for generating compile time safe constants for our localization strings as well as assets using swiftgen.

This is working very well in Xcode 16, but fails in Xcode 26 beta 1 and beta 2 as well.

The failure is specifically: unsupported configuration: the aggregate target 'Localization' has package dependencies, but targets that build for different platforms depend on it.

I've reduced this to a minimal sample project, which you can find here.. To reproduce: Open the Repro workspace, that is attached in Xcode. Try to build TestyPackage. You'll see the error.

I've filed this bug during WWDC week, but no feedback yet and no solution in Xcode 26 beta 2. Here's the feedback number, in case you have this too and want to file a duplicate: FB17934050.

Does anyone else have this issue and perhaps a solution?

Replies  2
Boosts  3
Views  111
Participants  3
Quappi
Quappi OP
1w

Having a similar error (but with a different package) on Xcode 26:

unsupported configuration: the aggregate target 'OpenAPIGenerator' has package dependencies, but targets that build for different platforms depend on it
1
0xfeedface
0xfeedface OP
1d

This worked for me, workdaround

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Compiling Swift Package with Dependency on Build Tool Plugin Fails in Xcode 26
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