Apple Mach-O Linker Error when compiling for device

Question

I ve just upgraded to xcode 4 0 and I can no longer deploy to iPhone  I get a Apple Mach-O Linker Error  it still works for the simulator though       Ld  Users yveswheeler Library Developer Xcode DerivedData iParcel-fkeqjcjcbbhjwhdssjptkdxzzzxh Build Intermediates iParcel build Debug-iphoneos iParcel build Objects-normal armv7 iParcel normal armv7     cd  Users yveswheeler iParcel     setenv IPHONEOS DEPLOYMENT TARGET 3 2     setenv PATH   Developer Platforms iPhoneOS platform Developer usr bin  Developer usr bin  usr bin  bin  usr sbin  sbin       Developer Platforms iPhoneOS platform Developer usr bin g  -4 2 -arch armv7 -isysroot  Developer Platforms iPhoneOS platform Developer SDKs iPhoneOS4 3 sdk -L Users yveswheeler Library Developer Xcode DerivedData iParcel-fkeqjcjcbbhjwhdssjptkdxzzzxh Build Products Debug-iphoneos -F Users yveswheeler Library Developer Xcode DerivedData iParcel-fkeqjcjcbbhjwhdssjptkdxzzzxh Build Products Debug-iphoneos -filelist  Users yveswheeler Library Developer Xcode DerivedData iParcel-fkeqjcjcbbhjwhdssjptkdxzzzxh Build Intermediates iParcel build Debug-iphoneos iParcel build Objects-normal armv7 iParcel LinkFileList -dead strip -all load -ObjC -lxml2 -miphoneos-version-min 3 2 -framework UIKit -framework CoreGraphics -framework QuartzCore  Users yveswheeler Library Developer Xcode DerivedData iParcel-fkeqjcjcbbhjwhdssjptkdxzzzxh Build Products Debug-iphoneos libThree20 a  Users yveswheeler Library Developer Xcode DerivedData iParcel-fkeqjcjcbbhjwhdssjptkdxzzzxh Build Products Debug-iphoneos libThree20Core a  Users yveswheeler Library Developer Xcode DerivedData iParcel-fkeqjcjcbbhjwhdssjptkdxzzzxh Build Products Debug-iphoneos libThree20Network a  Users yveswheeler Library Developer Xcode DerivedData iParcel-fkeqjcjcbbhjwhdssjptkdxzzzxh Build Products Debug-iphoneos libThree20Style a  Users yveswheeler Library Developer Xcode DerivedData iParcel-fkeqjcjcbbhjwhdssjptkdxzzzxh Build Products Debug-iphoneos libThree20UI a  Users yveswheeler Library Developer Xcode DerivedData iParcel-fkeqjcjcbbhjwhdssjptkdxzzzxh Build Products Debug-iphoneos libThree20UICommon a  Users yveswheeler Library Developer Xcode DerivedData iParcel-fkeqjcjcbbhjwhdssjptkdxzzzxh Build Products Debug-iphoneos libThree20UINavigator a -framework AddressBook -lz 1 2 3 -framework Foundation -framework CFNetwork -framework MobileCoreServices -framework SystemConfiguration -framework MessageUI -framework AudioToolbox -o  Users yveswheeler Library Developer Xcode DerivedData iParcel-fkeqjcjcbbhjwhdssjptkdxzzzxh Build Intermediates iParcel build Debug-iphoneos iParcel build Objects-normal armv7 iParcel  arm-apple-darwin10-g  -4 2 1   Users yveswheeler Library Developer Xcode DerivedData iParcel-fkeqjcjcbbhjwhdssjptkdxzzzxh Build Products Debug-iphoneos libThree20 a  No such file or directory arm-apple-darwin10-g  -4 2 1   Users yveswheeler Library Developer Xcode DerivedData iParcel-fkeqjcjcbbhjwhdssjptkdxzzzxh Build Products Debug-iphoneos libThree20Core a  No such file or directory arm-apple-darwin10-g  -4 2 1   Users yveswheeler Library Developer Xcode DerivedData iParcel-fkeqjcjcbbhjwhdssjptkdxzzzxh Build Products Debug-iphoneos libThree20Network a  No such file or directory arm-apple-darwin10-g  -4 2 1   Users yveswheeler Library Developer Xcode DerivedData iParcel-fkeqjcjcbbhjwhdssjptkdxzzzxh Build Products Debug-iphoneos libThree20Style a  No such file or directory arm-apple-darwin10-g  -4 2 1   Users yveswheeler Library Developer Xcode DerivedData iParcel-fkeqjcjcbbhjwhdssjptkdxzzzxh Build Products Debug-iphoneos libThree20UI a  No such file or directory arm-apple-darwin10-g  -4 2 1   Users yveswheeler Library Developer Xcode DerivedData iParcel-fkeqjcjcbbhjwhdssjptkdxzzzxh Build Products Debug-iphoneos libThree20UICommon a  No such file or directory arm-apple-darwin10-g  -4 2 1   Users yveswheeler Library Developer Xcode DerivedData iParcel-fkeqjcjcbbhjwhdssjptkdxzzzxh Build Products Debug-iphoneos libThree20UINavigator a  No such file or directory Command  Developer Platforms iPhoneOS platform Developer usr bin g  -4 2 failed with exit code 1

User · Answer

My specific error was   ld  entry point   main  undefined  for architecture armv7  Which should have been obvious  but it s because main m was not include into Compile Sources under Build Phases

User · Answer

I had to make sure my framework was built with a Simulator selected in order to build my project with a simulator  my project of course is using the framework   Same goes for building on my iPhone everything has to be in sync not sure why but it fixes the issue   I hope this helps someone

User · Answer

Menu   Product   Clean  this is what made it work  I m not sure about everyone else  I added pic to show

User · Answer

I just try to create a category class file and got this weird issue  and finally     Wrong way to create category class that causes the issue  New File - gt  Cocoa Touch - gt  Objective-C class  then I modified the name of files to Category Class like name    i e  OriginalClass CategoryName h m to OriginalClass CategoryName h m  and also modified the contents in the file   Right way here  New File - gt  Cocoa Touch - gt  Objective-C category  and it ll auto generate files  OriginalClass CategoryName h m   Oh  how stupid I am

User · Answer

I was accidentally trying to compile for 64-bit simulator which was not agreeing with my CocoaPods

User · Answer

I had exactly the same problem just because I had two same constants in different classes  You also can have this problem if you import  m file not  h file

User · Answer

I had the same and managed to solve it    In xcode preferences  location tab change value under build location to  Place build products in locations specified by targets

User · Answer

Could you try Unity-Build Settings-Player Settings-SDK Version  Device SDK instead of simulator sdk  Ive had such error and that fixed it

User · Answer

I had the same problem and the issue was that I have accidently imported a  m file instead of  h in an implementation file - hope it helps

User · Answer

Follow these steps to fix this problem   Go to project settings and Build Tab  Search for  Other Linker Flags   Double click on the linker flags for Release and Change      TARGET BUILD DIR  libCordova a to   BUILT PRODUCTS DIR  libCordova a   Do the same for Debug Clean and build archive again

User · Answer

open  xcworkspace file not  xcodeproj  I repeat open  xcworkspace file  All of your errors will go away

User · Answer

In my case  I just removed armv7s and armv64 and build its works

User · Answer

Fix  Build Settings   Enable Bitcode   No

User · Answer

I m running xcode 5  In my case I ve to change my  Deployment Target   It was previously set as 3 0 and I change it to 7 0  Now the error message gone  To change your  Deployment Target    follow the steps    Go to your  Project name   top left  Go to your  Targets   middle of the screen  Go to  General   Deployment Info   Deployment Target    Change it to current iOS version  -Thanks

User · Answer

I had this same problem just a minute ago  which lead me here  which wasn t of any help  But I figured out what was the problem and fixed it  the problem was that in my header file i had declare one instance of the struct class named trig node SIZE    my header     struct TrigNode       float msin      float mcos      float mtan   trig node SIZE     and in my  cpp file i have a function that access this instance and return the answer   float cos table  float deg        uint n     SIZE DEGRE  deg       return trig node n   DEGRE  mcos      which is what as causing my linking error  So  to fix that i place the instance of the trig table class  trig node SIZE    in the  cpp file which cleared the error  so now the new fix looked something like this  my header     struct TrigNode       float msin      float mcos      float mtan       my  cpp file     trig node SIZE   float cos table  float deg        uint n     SIZE DEGRE  deg       return trig node n   DEGRE  mcos

User · Answer

I struggled with this for a little while  and in my case it ended up being the Build Setting under Search Paths called FRAMEWORK SEARCH PATHS   It helped that I selected the  Levels  button  which seemed to compare my project  target and  Resolved  settings   I saw that my target setting somehow overrode the default of    inherited    and the overridden value was what XCode  resolved  the setting to be   When I removed the override  which in this case specified the 3 2 sdk  the linker errors went away -- as did some recently appeared warnings about any classes where I called post-4 0 methods   About those warnings -- I never saw them before I added the MessageUI framework for a recent change   I suspect  but don t know for sure  that when I added that framework  XCode tried to do something clever by adding that override to my target   I didn t do it explicitly at any point   The warnings were for example  about the URLByAppendingPathComponent method of NSURL  which did not appear until sdk 4 0   Prior to adding the MessageUI framework  I never got that warning   And since I removed the override  I no longer get them

User · Answer

I got the same issue when i export FMDB module in xcode 4 6  Later i found a fmdb m in my my file list which was causing this issue  After i removed from the project it works fine

User · Answer

Check to make sure that you don t have a specific framework search path specified  if you go to the info on the target and just remove the framework search path entries it should use the defaults for your specified deployment version

User · Answer

Re  Problem as outlined in title   Just in case anyone else missed the obvious     I came across this error after installing a new version of Xcode4 and dragging existing files into a new project  I had failed to spot that the  add to targets  checkbox was left unchecked in the  Choose options for adding files   dialog  Correcting my omission in Targets Build Phases Compile Sources solved the problem

User · Answer

If you have defined NSObject with the same name like   NSObject  notUniqueObj    even in 2 different files   if you are importing one in another    it will give you an error  Give different names for those

User · Answer

I got this problem after importing a framework  Under  Build Phases   the framework s name was highlighted in red  I added the framework again and the problem was solved

User · Answer

My problem was that in multiple class m files I had created an NSString named TAG  and I had set the value of TAG to the String name of each class  Ex  NSString   TAG   HWGuiControl    I had done so that then it was easy to prepend my NSLog statements with the name of the class    I have used this system in Android with great success  great for analyzing program flow 2 years later   Deploying to a device  this all works great   But when its time to create an Archive for distribution  apparently the linker cannot contend with the NSString named TAG appearing in multiple files   Modifying the name s  of TAG to HWGTAG  etc  did the trick

User · Answer

You may need to update your build settings   Verify the iOS target version and the processor architectures  as you may not have the old SDKs with XCode 4   You may see   Missing SDK   on the build settings  Change that to whatever applies

User · Answer

I was able to fix this error by editing  Library Search Paths    It cropped up in the first place because I had moved a couple folders around  and that ended up giving my build settings two different search paths because they are are automatically added to your build settings when you link a library framework  but they are not always removed    So if you move a linked library framework to a different directory and re-link it  you ll have to manually edit the search path   You might be able to dodge this by removing the library framework before moving it  but I haven t tested that

User · Answer

I had the same issue  just accidentally deleted a  m file  while  h was in the project  The problem disappeared when I ve restored the  m file

User · Answer

I had the same problem  and I solved it   In my case   architectures  setting caused the problem   In my project file  Build Settings tab  Architectures were set to armv6  I changed it to Standard armv7   do clean and build  Then it worked

User · Answer

i think the best response is to look into files  imports   some imports has a problem     example    include  import  file m  or  include external file h

User · Answer

The solution of this problem is very simple  Just go to the directory where the project installed and open the file  with extension   xcworkspace   That will solve the problem

User · Answer

This error can also be occurred if you have imported two different versions of same library  in this case just remove the older version and keep only one version and Magic will work for you

User · Answer

Here is permanent solution Generally overwriting project may cause this prolems Try this method   -UPDATE - Clang error - Mach-O Linker error  In some case error log window displaying  xctest error  to fix it  -  Select your project  -  Beside this just before General tab  select your projectTest file from dropdown  -  There is one option  like ProjNameTests   -  In Host Application  select your project from dropdown only if it show custom  DONE     Old method deleted

User · Answer

None of these answers helped me  Then I tried to reinstall Cocoapods   pod deintegrate  pod install   Problem solved

User · Answer

I fixed it by changing Mach-O Type under linking section on the Build settings from Nothing to Executable

User · Answer

To add onto the list of weird stuff that fixed this issue     I had some const CGFloat variables in a global header file like so  const NSInteger  globalInteger1   2  const NSInteger  globalInteger2   3    The moment I removed these  all was fine

User · Answer

If you are using CoreData  and you use XCode to generate NSManagedObject subclasses for your entities  make sure you only generate one for each entity   My problem was that it generated multiple NSManagedObject subclasses for the same entity  and put them in different folders     I just deleted all of them and regenerated the NSManagedObject subclasses

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For me was architectures fault when running on device in XCode 4 5 x    XCode 4 5 doesn t support armv6 any more  so my fix was   I just edited all targets in all libraries  three20Core  three20Common  etc   and libThree20  in build settings have chosen only armv7 and armv7s in  Architectures  and  Valid Architectures

User · Answer

My issue was because I didn t defined variables as extern in one of my header files and it was redeclared in the  c file

User · Answer

In my own case  I had duplicate declarations of some keys  I declared some NSString Constants using the extern keyword and did exactly the same thing in two different class files  When I removed one of them  the error disappeared   extern NSString  const CFDataStatusKey  extern NSString  const CFDataErrorKey  extern NSString  const CFDataReasonKey  extern NSString  const CFDataChannelsKey    These where declared and initialized respectively in  h and  m files of the two classes  Removing a duplicate solved the issue  Hopes this helps

User · Answer

For me it was accidentally importing an implementation   m  file instead of the corresponding header   h  file  As soon as I caught that the project build was back to normal

User · Answer

The problem was that in XCode 4  the dependencies do not assume the architecture settings of the main project  as they previously did in XCode 3  I had to go through all of my dependencies setting them for the correct architecture

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Bizarre error   For me  I just cleaned and restarted Xcode and the problem went away

User · Answer

in my case i just moved the  h  m file from one folder to other folder and that folder was not exsisting behind  so i created folder first on finder and then moved the file on finder  and then add that folder  and remove the reference of moved filed to other folder from project  it stopped giving me error

User · Answer

Just ran into the same issue   The solution  for me    check your frameworks    In my case I had added classes related to CoreData without  CoreData framework   Adding it solved the MACH O complaining

User · Answer

Try to clean your project  and Compile

User · Answer

If you use Xcode 7 or later just do a product -  clean  This worked for me

User · Answer

I encountered with this problem to figure out that I have two references in my XCODE project  Just delete the other reference  Hope this helps

User · Answer

With CocoaPod  first install and then open the workspace instead of project as specified on CocoaPod website     pod install    open YOUR PROJECT NAME xcworkspace

User · Answer

I solved this problem too weird     Go to Target   Build Phases   Link Binary with libraries    Remove all your frameworks and add them again     Hope it works for you

User · Answer

I simply had to files with a main   method and Xcode wasn t happy about that

User · Answer

Code Signinig     I had this issue too -  linker command failed with exit code 1  use -v to see invocation    my problem was I tried to run the app on a real device  and I forgot to configure the Code Signing section in the Build Settings tab

User · Answer

I had this issue and importing QuartzCore fixed it

User · Answer

In my case  the cause of such Apple Mach-O Linker error was source code file   m  inclusion to resource bundle target   Verify that recently created  m file is not included in a bundle  select the file in project navigator  open file inspector and make sure that resource bundle checkbox is deselected in Target Membership section

User · Answer

Please go to your workspace setting and make the following changes   Workspace Setting     Build System       Legacy BuilPer-User    Per-User Workspace   DerivedData      Workspace relative location    Build System      Use User Setting

User · Answer

In my case i has include  m file thats why compiler shows this type of error   you should check the latest file import that is not  m file   Sometime i

User · Answer

I mistakenly defined a new constant with the same name as an existing constant in a different file and it caused this error for me using xCode 4 3 1   xCode didn t complain but the compiler doesn t like it

User · Answer

I accidentally added two copies of the same subclass of a UITableViewController  Removing one of the sets of files cleared up the error

User · Answer

If you used XCode to create a custom NSManagedObject class and then add to it and generate a new file for the custom class  sometimes XCode will not overwrite your old class and you will be stuck with two of the same files but in different directories  Find the old file and delete it   The problem could be something else though

User · Answer

If you re getting a Mach-O Linker warning or error that says  Directory not found for option   lookup the path of that directory   If it s missing try downloading the latest version of RestKit and putting the folder in manually

User · Answer

for me the problem was I had loaded same functions twice  Remove -ObjC from Build Settings   Linking   Other Linker Flags

User · Answer

Changing  Build Active Architectures Only  to Yes in CordovaLib xcodeproj -  Build Settings did the trick for me  earlier the app was running on simulator  but not on the device

User · Answer

I would like to share one more reason when I got this error    I had changed the project name in Project Navigator in Xcode 6 1 1  by single click on it and my project would not compile  I changed the project name back to old name  project was building  Very very strange but yes I have faced this  I hope this information helps

User · Answer

For Swift language      I am getting this error   ld  file too small  length 0           In my case I just clean the project and then rebuild it     Steps -  1  goto Project -  Clean  2  goto Project -  Build  Hope this helps

User · Answer

This did a trick for me   Go to   1  Products   clean  2  Windows   Projects  3  Select your project and click on  Delete  derived Data  4  Products   Build

User · Answer

My fix for my same problem  Adding the  other linker flags  in  Project  and not in  Targets   So  I moved it to  Targets   it shouldn t be in  Project

User · Answer

In my case I had duplicated a class file  Found it by using the bottom search field at the right side bar of Xcode  so to solve it remove reference of one of them

User · Answer

In my case the problem was having different architectures specified under different targets   I was building my application target with armv6  armv7 and cocos2d with Standard  amrv7    Go into build settings and make sure your architectures agree for all targets

User · Answer

One possibility  Turn on  Dead code stripping  in the Xcode 4 build settings   Another possibility  It could be that you switched to using LLVM for some framework that was previously using GCC  Moving back to GCC  or LLVM GCC  may get rid of those warnings

User · Answer

I had the same Problem  As I was dragging some files  h and  m into my Project and Xcode started showing me this error clang  error  linker command failed with exit code 1  use -v to see invocation  while running   Later I discovered that I already have that  h  amp   m in my Xcode Project under some other SubFolder  So I deleted that Extra  h and  m   Cleaned my Project and Its working now   clang  error  linker command failed with exit code 1  use -v to see invocation  This error comes for a number of reason  Thats why this Question has so many Answers  You just need to see  amp  check  what case you fall in

User · Answer

Not sure if it s related  but seeing that you re running some three20 libraries  you may want to check this post on their website  http   three20 info article 2011-03-10-Xcode4-Support

[objective-c] Apple Mach-O Linker Error when compiling for device

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