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.
Triumpfi
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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.