Command Xcode app Contents Developer Toolchains XcodeDefault xctoolchain usr bin clang failed with exit code 1

Question

I m trying to do an application reading pdf using pdf kit in Xcode 4 3 but it gives me the following error   ld  duplicate symbol  OBJC METACLASS   OverlayManager in  Users dt4it Library Developer Xcode DerivedData MyPdf4-bmkjglhhvneluqcbwpceiqjvdcmq Build Intermediates MyPdf4 build Debug-iphonesimulator MyPdf4 build Objects-normal i386 OverlayManager-D0866CFD31A05E68 o and  Users dt4it Library Developer Xcode DerivedData MyPdf4-bmkjglhhvneluqcbwpceiqjvdcmq Build Intermediates MyPdf4 build Debug-iphonesimulator MyPdf4 build Objects-normal i386 OverlayManager-B31AE7412100AF6D o for architecture i386 Command  Xcode app Contents Developer Toolchains XcodeDefault xctoolchain usr bin clang failed with exit code 1   any help please

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Xcode 8   Spoek s answer is right   But If you won t find file in red color  then find the one with low opacity    see this image     The first one is there but second one is note there  so delete it

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For me this error appears after cloning the project from a repository  Someone removed a white space from the projects name  renamed   The Project  to  TheProject   which caused some Build Settings errors to unvalid paths   Sometimes reading the whole error logs is not a bad idea

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deleting   Library Developer Xcode DerivedData helped me   reference   link

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Try this - click on the name of your project on the list of files folders on the left in Xcode  at the very top of the list   Look at the  Targets  section on the left-hand side of the window to the right  Likely  there s two listed with the second being a  test  item  Right-click on that item and select  delete   Then try to run the project again

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Had this happen in a team using git  One of the team members added a class from an external source but didn t copy it into the repo directory  The local version compiled fine but the continuous integration failed with this error   Reimporting the files and adding them to the directory under version control fixed it

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I had this same error and nobody seems to have an answer on StackOverflow that actually works   My problem was when I tried copying a project that was in a team repository   Turns out  in the ignore file  all files with the extension of   pch were ignored from repository commits   This means that when I went to pull the project from the repo  the  pch file was missing  thus throwing this error   Fortunately I had a copy of the project still and was able to just copy the  pch file over and I was then able to compile just fine   Hope this helps

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This happened to me and it took me an hour to find it   In my case I had typed too fast and did    seld method     instead of    self method     Seriously   I don t know why it didn t catch this in a more recognizable way   But it was of course looking for a class called  seld

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I face this problem too  And ofc I looked for help in SO instead of use the common sense and check the error message   The last part of the error message was the same as you   Command  Applications Xcode app Contents Developer Toolchains XcodeDefault xctoolchain usr bin clang failed with exit code 11   But few lines above I found   In file included from  Users Ricardo Documents XCode RealEstate-Finder-v1 2 RealEstateFinder RealEstateFinder RealEstateFinder-Prefix pch 26   Users Ricardo Documents XCode RealEstate-Finder-v1 2 RealEstateFinder RealEstateFinder Config Config h 174 1  warning  type specifier missing  defaults to  int   -Wimplicit-int  http   www myserver com apps mobile rest php id 12   Which points to my Config h file   Happy coding

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The thing to consider here is the   pch file  If you re doing an include from an external library then you have to make sure you re doing the include after  ifdef OBJC and before  endif  If you try to do your include outside this condition this might be a cause of the compiler error

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In my case   Build Phases -  check Compile Sources files -  delete xxx swift files that xcode says  can t find  xxx swift

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I too had this error  But in my case  and I m sure I ll be a one off here  I had accidentally deleted main m when I hit the delete key after the app had crashed on the iPhone simulator   After a crash  Xcode shows the main m file and when I had hit delete  I had accidentally deleted the main m file from my project  as it is easy to do when a file name is highlighted  not the code in the detail view    Main m normally resides in a group or folder named supporting files in the project file manager  I had not noticed this happened until it failed to build and run next time around and then I had to re-read the error message more closely and saw it said main m is missing   Thank you all for your input  but just in case there is someone in my position check for any file names in red showing missing files and restore them from a backup if you have it

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Adding the missing files files in red color in Xcode- target- Build Phases- compiled sources  to the target folder resolved the issue for me

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This problem usually occurs when there are more than two versions of XCode are installed in which different Swift versions incorporated for Ex  XCode 6 4 and XCode 7 3 are installed which are running Swift 1 2 and Swift 2 0  By mistake you tries to compile code with icorrect version for Ex  your project in in Swift 1 2 and you tries to compile it with xcode 7 3  In this case drive data stores information for swift version but when you tries to compile code with correct XCode it gives error  To resolve this    Delete drive Data  a  In Xcode select preferences      Once preferences  are open click on Location tab and click on the arrow in front of the  Drived data  path  It will open drived data folder      Quit Xcode Delete all drive data  reopen the project in correct XCode error is fixed

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Project Settings   Under  Targets   select your project   Build Phases    open  Compile Sources  and  Copy Bundle Resources   Check if any files are listed in red color  If so   just delete it  Then clean and run    Worked for me

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My case  I fix it by   Go to Build Phases and check Compile Sources files  check if it has duplicate file  just keep one

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Go to target preferences  summary tab  find  Deployment target  and increase it

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In my case it was a duplicate Swift Flag entry inside my Target s Build Settings   Other Swift Flags  I had two -Xfrontend entries in it

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The same thing happened to me and i found that i forgot to put the   at the end of the    import  CPDConstants h   so instead   import  CPDConstants h

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My problem was that under Build Phases -  Compile Sources  I added a compiler flag for a file  but I had misspelled it  It was supposed to be   -fno-obj-arc   to show that this file does not use ARC

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May be it will be helpful for someone  I had the same error after deleting several files from project  After having deletes committed in git repository this error has gone

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You have accidentally included the  m file OverlayManager instead of the  h file inside the actual OverlayManager class itself   Basically  he compiler already knows to compile the  m file  but when you  import it  the compiler tries to include it inline with that same source file  thus generating duplicate symbols   But your case is unique  seeing as you are  importing the  m of the actual class   m file   It s recursively compiling your OverlayManager class

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Do a clean   product  gt  clean    Terminal purge  amp  reboot didn t work for me  cleaning did

[iphone] Command /Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang failed with exit code 1

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