Xcode warning Multiple build commands for output file

Question

I am getting an error like this    WARN Warning  Multiple build commands for output file  Developer B Be build Release-iphonesimulator BB app no png  WARN Warning  Multiple build commands for output file  Developer B Be build Release-iphonesimulator BB app d png  WARN Warning  Multiple build commands for output file  Developer B Be build Release-iphonesimulator BB app n png  But I have checked Xcode and I don t see any duplicates of such files at all  As this post in the Apple Mailing Lists say  there are no duplicates

User · Answer

Swift 3   but also the older versions  it happen when I have assets with duplicates  Just rename the files with this issue and all go well    It could happen also when you have made a Assets xcassets and you have renamed the duplicates with new names so after time you forgot it and  remove it to add the folder references but this one return to the duplicate files problem

User · Answer

Open the Frameworks folder in your project and make sure there are only frameworks inside  I added by mistake the whole Developer folder

User · Answer

In my case the issue was caused by the same name of target and folder inside a group   Just rename conflicted file or folder to resolve the issue

User · Answer

This is not an Xcode bug  though the warning message is not helpful enough to describe the real cause   This error message occurs when you have several files in your project that have the same name  You just have to delete or rename the files with duplicate names and the problem is solved

User · Answer

In the Project Navigator  select your Xcode Project file  This will show you the project settings as well as the targets in the project   Look in the  Copy Bundle Resources  Build Phase  You should find the offending files in that list twice  Delete the duplicate reference   Xcode is complaining that you are trying to bundle the same file with your application two times

User · Answer

As previously mentioned  this issue can be seen if you have multiple files with the same name  but in different groups  yellow folders  in the project navigator  In my case  this was intentional as I had multiple subdirectories each with a  preview jpg  that I wanted copying to the app bundle     In this situation  you need to ensure that Xcode recognises the directory reference  blue folder icon   not just the groups   Remove the offending files and choose  Remove Reference   so we don t delete them entirely       Re-add them to the project by dragging them back into the project navigator  In the dialog that appears  choose  Create folder references for any added folders       Notice that the files now have a blue folder icon in the project navigator       If you now look under the  Copy Bundle Resources  section of the target s build phases  you will notice that there is a single entry for the entire folder  rather than entries for each item contained within the directory  The compiler will not complain about multiple build commands for those files

User · Answer

This is not a bug  Xcode assists can assist you  Select the target  to the left in the project Navigator  Click on  Validate settings  at the bottom of the settings  Xcode will check the settings and removes duplicates if possible

User · Answer

This is easily caused when you add git based subprojects   Xcode isn t smart enough to ignore the  git subfolder even though you can t see it from finder  so it will get very confused that there are multiple files named  master  or  exclude    standard git repo files    With Xcode4  go to the project  root of the left tree  then click your app target and expand  Copy Bundle Resources   then remove all the references to  git  you shouldn t need them baked into your app anyway

User · Answer

Commenting use frameworks  in PodFile worked for me    use frameworks    Note  Did this on XCode 10 1  pod version 1 8 4

User · Answer

This happens if you have 2 files with the same name in the project  Even though files are in groups in XCode when the project is compiled all of the files end up in the same directory  In other words if you have  group1 image jpg and  group2 image jpg the compiled project will only have one of the two image jpg files

User · Answer

For me the Target   Build Settings   Packaging   Product Name was set to the same thing as another value referenced in a  plist file which was custom to my app  Eventually due to our build process this creates duplicate files

User · Answer

This happends because  ur  no png   d png  and  n png  are duplicated in resources   Just look for delete dublicated files and delete

User · Answer

another version of this situation can occur when there are duplicates in the Headers build phase   to fix this       go to your project target choose Build Phases choose the Headers build phase enter the name shown in the warning notice the two  or more  items find the   - boxes in the lower left corner select one of the items  and click the - button

User · Answer

I m pretty sure this can be caused by an XCode 4 bug  at least in the cases that I ve encountered it in     It happens if you add multiple language dependent files to the project at the same time   I found this out by looking through the git differences  I did nothing in the commit but add some new localized nib files   But looking back at the difference of the project pbxproj file it showed a bunch of new duplicate references added for files that were already in the project before   The files it did this too seemed random to me     I reproduced this same exact behavior multiple times   Deleting these files from the project does not fix the problem because it only deletes the original reference and leaves the duplicates   The only way to fix it is to go back a commit and start over  or hand edit the project file  which is a really good way to screw it up even more since it s hard to tell which duplicates to remove and you have to do it in a ton of different places   Xcode 4 is just a huge disappointment for me

User · Answer

I had the same problem minutes ago  I ve mentioned changing the  deployment target  fixed my problem

User · Answer

The error seem to appear when u have more than one reference of the same file  I had 2 files of the same name and got this error  When I delete one of them the error disappear

User · Answer

I found a pretty easy solution for this    Select the file causing the problem from the project navigator Uncheck the target membership from the file inspector Build the project Recheck the target membership for the file again   The warning is gone  Check this image for reference

User · Answer

One of simple way is     Go to App target  Go to Build Phases Output files Delete path of out put files  then build project  It will run successfully

User · Answer

Actually  the answer to this is quite simple   In your Xcode project search for the files which raise the warning  and just delete one of them   Xcode will show only one reference of that file in the search results  but don t stop there  go ahead and delete it   it s better to make a backup of your project file before deleting it   Now build the project again  The warning should disappear now   this answer is for a previous version of xcode

User · Answer

React-Native users   goto file -  workspace settings -  build system -  change it to legacy build system  and it should build fine now  React-Native isn t compatible with the new file system yet

User · Answer

The key was to do pod deintegrate and rm   workspace file   What a waste of time

User · Answer

While I m sure there is a better way  nuking only took me less than 60 seconds  and was the only thing I could find that worked    Drag repo to the trash    re-clone your repo   set up your repo with correct remote tracking  git remote add  lt url git gt   or git remote set-url  lt url git gt

User · Answer

Yet another variation on this issue   I had the same message come up none of the previously suggested solutions solved the problem  I definitely only had one copy of the offending file for instance    My solution was to edit the project pbxproj file in a text editor  after quitting XCode and backing up the file of course  and remove all references to the offending file   Then  after starting XCode again  I manually added the file back into the project and everything was ok    My suspicion is that this problem happened to me because of a manual  ie  non-XCode  merge of the project file

[xcode] Xcode warning: "Multiple build commands for output file"

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