Xcode 15 beta 5 External macro implementation type 'ObservationMacros.ObservableMacro' could not be found for macro 'Observable()

Question

fgrios@me.com OP

Created Jul ’23

Replies 7

Boosts 5

Views 3.6k

Participants 11

Using Xcode 15 Beta 5 the following error now appears when building an app with @Observable

External macro implementation type 'ObservationMacros.ObservableMacro' could not be found for macro 'Observable()'; the type must be public and provided by a macro target in a Swift package, or via '-plugin-path' or '-load-plugin-library'

See the attached image.

This does not happen on other team member’s computer. He can compile app just fine and I can compile app file on Xcode 15 beta 4 and below. This just started happening with Beta 5 installation.

I have deleted all derived data, deleted the Derived data folder for the project, restarted Xcode, restarted machine, reinstalled Xcode 15 beta 5. Nothing helps.

Boost

Answer 1

CD. OP

Jul ’23

Have the same problem in two different projects.

Please reply with a fix.

0

Answer 2

mayur_tanna OP

Jul ’23

Yes even their sample app of Observable having this issue (in Beta 5) so looks like we need to wait until they fixed it.

0

Answer 3

alexfringes OP

Jul ’23

This seems to be caused by having a space in the name of the Xcode app (e.g. to delineate betas, I had renamed the app "Xcode 15 Beta 5"). Removing the spaces solved this issue for me.

7

Answer 4

FunkyMusic OP

Sep ’23

Just download Xcode 15 RC and a SwiftData Sample from Apple. Sell this error all over:

External macro implementation type 'SwiftDataMacros.PersistentModelMacro' could not be found for macro 'Model()'

What's wrong with the RC?

1

Answer 5

MXCat OP

Sep ’23

I'm experiencing both a warning and a couple of errors in my case (a custom package with a macro). The errors are "Undefined symbols" and "Linker command failed with exit code 1". These issues only occur locally, initially on Xcode15-beta6 and persist even after the Xcode15 public release. However, when I compile the same source code on CI, it builds successfully (https://github.com/capturecontext/swift-foundation-extensions/tree/swift-macros).

0

Answer 6

Nils.CEWE OP

Oct ’23

I think I have the same Problem in the Xcode 15 final version:

https://developer.apple.com/forums/thread/737908

0

Answer 7

Triumpfi OP

Oct ’23

I had the same issue and after hours found the solution on my side.

For our library we had to define a macOS support version besides iOS for SwiftSyntaxMacros. Locally we used MacOS 14 and set it to 14. On the Server we were running 13.X. We did not get a error for the MacOS support version only "error: external macro implementation type 'foo' could not be found for macro 'foo'".

After setting it to MacOS 12 the issue was gone:

platforms: [.macOS(.v12), .iOS(.v15)],

I hope this is useful for you. Online I found no solutions for this issue.

0