Command CompileSwift failed with a nonzero exit code in Xcode 10

Question

Good afternoon   After updating to the latest version of Xcode at the moment  version 10 0  the project is unable to build because it found some errors regarding some  Command CompileSwift failed with a nonzero exit code  error   How do I solve this errors  They appear in most of the Pods  I use CocoaPods  I use inside my project   I have tried updating the pod version and the pods to the latest version available  but the problem is still there   I have searched a lot through the web and there is very little information regarding this issue   Regards

User · Answer

in my case the problem was due to watchkit extension being set to swift 3 while the main project s target was set to swift 4 2

User · Answer

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

User · Answer

Class re-declaration will be the problem  check duplicate class and build

User · Answer

Mine was a name spacing issue  I had two files with the same name  Just renamed them and it resolved    Always gotta check the  stupid me  box first before looking elsewhere

User · Answer

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

User · Answer

For me  just cleaning project works using ShiftCommandK  amp  OptionShiftCommandK

User · Answer

Currently my build is working  Here you are the steps I tried until it finally worked    Search in the whole project the word CommonCrypto  If you have a Pod containing that header import  remove this Pod from the Podfile and perform a pod install  Clean and build the project  Add again the Pod to the Podfile and perform a pod install  Clean and build the project again using a real device if possible    And If you don t have that Pod  maybe you can try by making the same steps with some old Pod that you may encounter in your project   Added information  also If you have some code error inside a Pod  first you need to solve that code problem and then try to compile again the project   I m going to copy the changes made in my project pbxproj  I know it s not very helpful but it s the only thing that have changed in the git difference commit   Removed  BDC9821B1E9BD1B600ADE0EF     null  in Sources       isa   PBXBuildFile     Added    BDC9821B1E9BD1B600ADE0EF    BuildFile in Sources       isa   PBXBuildFile       I hope this can help   Regards

User · Answer

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

User · Answer

I attempted   Closing  amp  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

User · Answer

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

User · Answer

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

User · Answer

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

User · Answer

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

User · Answer

Just adding to this question  My issue didn t have anything to do with CommonCrypto  It created a new Single App application and tested to run  Compiler was complaining about using Swift 4 2  Changing the Swift language to version 4 0 in Build settings fixed the issue  Not sure if this is a bug

User · Answer

I got this randomly since Xcode 10  I think it occurs when I change something in the code while building starts  The next build works every time

User · Answer

This is a known issue with Swift 4 2 and Xcode 10  I found an article here that fixed it for me  https   github com Yummypets YPImagePicker issues 236  In short  go to your projects build settings  and add a user defined setting named SWIFT ENABLE BATCH MODE and set its value to NO   Previously  I tried each of the following methods suggested elsewhere  rebuild  exit Xcode  clean and rebuild  purge Derived Data files   None of them worked   Once I added the user define build setting per the article  Swift then told me the true error  In my case  it was a missing    but it could be any number of problems

User · Answer

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

User · Answer

I have the same issue and my solution is change a little thing in Build Settings  SWIFT COMPILATION MODE   singlefile  SWIFT OPTIMIZATION LEVEL    -O

User · Answer

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

User · Answer

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

User · Answer

My problem was I had due to the non-existence of a native Swift CommonCrypto  used a bridging header and a target that with some magic included it in the build  Since CommonCrypto is now native  I solved the problem by removing the target and the  import and instead added an import CommonCrypto where I used it

User · Answer

Running pod install --repo-update and closing and reopening x-code fixed this issue on all of my pods that had this error

User · Answer

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

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