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

Answer 1

It seems like this is a pretty vague error, so I will share what I did to fix it when I ran into this:

Using Xcode 10.1 and Swift 4.2 I tried pretty much all the suggestions here but none of them worked for me, then I realized a dependency I was using was not compatible with Swift 4.2 and that was causing me to get this error on other pods. So to fix it I just had to force that pod to use Swift 4.0 by putting this at the end of my Podfile:

post_install do |installer|
    installer.pods_project.targets.each do |target|
        if ['TKRadarChart'].include? target.name
            target.build_configurations.each do |config|
                config.build_settings['SWIFT_VERSION'] = '4.0'
            end
        end
    end
end

Answer 2

I did the following and it works like charm:

• Open Xcode Preferences (Command,)
• Go to the Locations tab
• Click on the small gray arrow which shows URL path for Derived Data

• The finder window will open up and show the following folders:

  • DerivedData
  • Archives
  • iOS DeviceSupport
  • UserData
  • DocumentationCache
  • iOS Device Logs

• Quit Xcode

• Delete the DerivedData folder (it just contains a cache from previous builds)
• Restart Xcode

Answer 3

I have the same issue and my solution is change a little thing in Build Settings

SWIFT_COMPILATION_MODE = singlefile;
SWIFT_OPTIMIZATION_LEVEL = "-O";

Answer 4

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.

Answer 5

I searched the whole web but I couldn't find any solution for this problem. I managed to REMOVE the "Common Crypto" path in the section: IMPORT Paths in Build settings. The problem seems to be that "common crypto" now exists in the foundation in the ios 12 sdk.

So":

Simply remove the path for file "common crypto" in the build settings and the project will build like a charm! :)

Answer 6

Let me share my experience for this issue fix.

Open target -> Build phases -> Copy Bundle Resources and remove info.plist.

Note: If you're using any extensions, remove the info.plist of that extension from the Targets.

Hope it helps.