Command CompileSwift failed with a nonzero exit code in Xcode 10 [duplicate]

Answer 1

I also encountered the same issue and I did what @cdeerinck suggested and got to the following link which suggested adding a user-defined variable to the Build Settings to disable batch mode i.e. add a new user defined variable named SWIFT_ENABLE_BATCH_MODE and set it to NO, I was able to get more insights into the issue and I got to know that the error was in a framework using CommonCrypto which was added to it(by me) but since Xcode 10 it is exposed natively as part of Swift (for Apple platforms only), and adding it (or its existence from the previous version) was causing a name collision and hence it was throwing the error. To know more refer to the this link which explains the issue in more detail.

Answer 2

ERROR = Command CompileSwiftSources failed with a nonzero exit code

In my case When I found this error, I got cramped with compilation. But when I see some related problem answers. I found a duplication file on my project. Where the same viewController was there as a class file. So yeah when I realized it I changed it name to new one. And yeah things changed!!!

Answer 3

In my case, there was a duplicate entry for a framework in the Input Files of Carthage framework section in Build Phases

Answer 4

For me, the error message said I had too many simulator files open to build Swift. When I quit the simulator and built again, everything worked.

Answer 5

Here is the solution: - Go to build settings - Search SWIFT_COMPILATION_MODE - If this is "Whole Module" for Release configuration then change it to "Incremental". - Archive now.

When you change the setting to "Incremental" the process succeeds.

Answer 6

I had this issue and changing the Compilation Mode setting for the project from Incremental to Whole Module fixed it for me.