Swift build error_if_any_output_files_are_specifie

问题:

When converting to use the new build system on Xcode 10, I get the following error in my output for several of my extension targets.

<unknown>:0: error: if any output files are specified, they all must be Command CompileSwift failed with a nonzero exit code

I have looked for a solution online, but the only reference I can find to this error is in the Swift compiler source code itself.

• https://www.google.com/search?q=error_if_any_output_files_are_specified_they_all_must_be

Does anyone know how this error is actually triggered, or what I can do to fix it?

回答1:

Ok, I had the same problem with one of our projects. Building or Archiving are always stopped with the error <unknown>:0: error: if any output files are specified, they all must be.

The solution for us was to set Compilation Mode to Incremental instead of Whole Module.

This means, you have to ignore the Validate Project Settings warning: