Command CompileSwift failed with a nonzero exit code in Xcode 10
I attempted
- Closing & Reopening Xcode
- Cleaning Build Folder
- Running
pod install --repo-update
and all of these still did not fix the problem.
Restarting the Mac did the trick!
For me, just cleaning project works using ShiftCommandK & OptionShiftCommandK.
You're most likely not reading the entire error message. If you look above the "Command CompileSwift failed with a nonzero exit code" message you should find some specification like this:
In this example I had two files with the same name. Once I fixed it everything worked as it should.