Undefined symbols for architecture armv7

Question

This problem has been driving me crazy  and I can t work out how to fix it         Undefined symbols for architecture armv7      deflateEnd   referenced from        - ASIDataCompressor closeStream  in ASIDataCompressor o     OBJC CLASS   ASIDataDecompressor   referenced from        objc-class-ref in ASIHTTPRequest o     deflate   referenced from        - ASIDataCompressor compressBytes length error shouldFinish   in ASIDataCompressor o     deflateInit2    referenced from        - ASIDataCompressor setupStream  in ASIDataCompressor o ld  symbol s  not found for architecture armv7 collect2  ld returned 1 exit status Command  Developer Platforms iPhoneOS platform Developer usr bin gcc-4 2 failed with exit code 1   I think it has to do with   ld  symbol s  not found for architecture armv7   But I have added  libz 1 2 3 dylib and it s not helping  anyone got any ideas

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I had a similar issue and saw errors related to "std::"

I changed Build Settings -> Apple LVM 5.0 - Language C++ -> C++ Standard Library

from libc++ (LLVM C++ Standard Library with C++11 support) to libstdc++ (GNU C++ Standard Library)

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For what it is worth  mine was fixed after I went to target- Build Phases- Link Binary With Libraries  deleted the libstdc   tbd reference  then added a reference to libstdc   6 0 9 tbd

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Here s how I got this problem   I added a  h   m and NIB from another project by dragging them onto my project navigator  Xcode didn t add them to the Build Phases properly   Check my answer because I had a similar problem that I was able to solve by doing some steps

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I have have multiple  interfaces in the  h file and hadn t yet included the all of the corresponding  implementation directives  Make sure that they are all balanced out

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I also added files through Dragging and Dropping  What I did  I removed references of all the files  Excluding frameworks  then added them again properly via Add Files To Project option  problem gone

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I had the same problem  I tried every thing from the huge list of answer but in the end my problem was  I m working with openCV so I need to combine C   code in my code  To do this you should change the files which use objective-c and C   to  mm I didn t changed one file and this file has no connection to the C   code but I had to change it

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I had a similar issue with that  The class name after  OBJC CLASS    was actually my class  The reason was I didn t tick  Add to Target  when I drag the source code files into navigation list    My solution was    delete the class from the navigation list and choose  remove reference only  drag the source code files again and make sure the tick box for  add to Target  is ticked  The tick box is just under  Copy if needed  and  Create group

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If you have the flag -ObjC under your Target   Build Settings   Other Linker Flags and you re getting this issue  consider removing it  If you intentionally added it because you need to load some Obj-C code from a static library that wouldn t normally be loaded otherwise  IE  an Obj-C category  then you should use -force load  lt path gt  instead of -ObjC    lt path gt  should be relative to your Xcode project directory  IE  if your directory structure looks like this   iOSProject     iOSAPI framework         iOSAPI     iOSAPI xcodeproj   Then you should have this flag set for Other Linker Flags   -force load iOSAPI framework iOSAPI   If you want to include multiple libraries like that  then you should include a separate -force load line for each of them   -force load iOSAPI framework iOSAPI -force load another framework another

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I only added the libz 1 2 5 dylib to my project and it worked like a charm   Steps -    Go to Build Phases  Link Binary With library - use the     button to choose frameworks and libraries to add  Select libz 1 2 5 dylib from the list  Build and run

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Finally i ve figured it out  I solved this issue by adding absent framework to target- Build Phases- Link Binary With Libraries

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I was facing an issue with PJSIP libraries   Tried the following in other linker flags in project and able to resolve the error  -framework Foundation -framework UIKit  Above linker flags are used in Siphone Project over github  These settings will help you resolve problems related to linking of C   libraries

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I had this warning  when wrote two classes in  h file of another class  but FORGOT to write the implementation for this classes in  m file

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If you faced this issue with your Flutter project while building in Release mode - that s what helped me    Set your build system to New Build System in File   Project Settings     delete folders ios and build ios from your project folder  create ios module by executing flutter create   from your project folder  open Xcode and    set the IOS Deployment Target to at least 9 0 in PROJECT   Runner check your Signing  amp   Capabilities make sure your Build Configuration is set to Release in Edit Scheme    and build for Generic iOS Device   execute pod install from your project folder execute flutter pub get from your project folder   now open your Xcode and build or archive it  Product   Build  or Archive

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I had a similar issue last night and the problem  was related to the fact that I had dragged a class from the Finder to my project in Xcode   The solution was to go the the Build Phases tab and then the Compile Sources and make sure you drag the class to the list

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I didn t find this suggestion here so here it goes  if your project has more than one target  ie one for OSX and one for iOS  then you must link the relevant libraries for each target   so for example in my case I needed AudioToolbox   I had to add it once for OSX and once for iOS  under the frameworks folder  you must have a duplicate of each library for each target   if you see only one   then that s a red flag

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Try to implement at least one non-inline function of your derived class  If you don t do this  the linker might avoid creating type info for that class

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In my case  I had a similar problem when I created a new branch under source control   I was able to resolve this problem by simply going Product gt Clean

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I got this problem when I run app on iphone5s  it was solved by add arm64 to Architectures

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In my case  I d added a framework that must be using Objective C    I found this post   XCode  m vs   mm  that explained how the main m needed to be renamed to main mm so that the Objective-C   classes could be   compiled  too   That fixed it for me

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Under Target -  Build Settings -  Apple LLVM compiler language  setting  C   Language Dialect  and  C   Standard Library  to Compiler default helped solve it

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This fixed my problem  The dependency I am using is not supporting armv7  So I had no other option than to remove it  Armv7 is used for only very old iphones anyway  like iphone 4     Go  Build Settings   All   Set  Valid Architectures  to  arm64 arm64e

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If you re building from Unity3D 5 and also using a Prime31 plugin and you re getting this error it s probably due to a duplicate  dll  If you look through your warnings in Unity s editor one of them will tell you this and warn that it could cause build errors  To see if this is the case  type P31 in your project search field and it should pop right up  maybe even more than one  The duplicate s will have a   1  at the end of the file name  This is probably caused from updating the plugin in editor via the store or the Prime31 menu tab

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Go TARGETS -  General -  Deployment Info -  set Target 8 1 or 10 0   Framework or Library have no ARMV7 Architecture

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In Xcode Version 6 3 2   I solved the exactly same problem by adding Library  libxml2 dylib and libz dylib In Link Binary With Libraries

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if you re dealing with the iOS5 upgrade  I found that for compiling a project written to target 4 3  I could just rename libz 1 2 3 dynlib in the Project Navigator to libz 1 2 5 dynlib and it compiled     My iPhoneOS50SDK usr lib folder has no libz 1 2 3 dynlib--don t know whether it s a beta thing or just natural upgrade

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For me the problem was that i forget to set value for my constants in the  m  implementation    file const kFooKey     Foo

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I once had this problem  I realized that while moving a class  I had overwritten the  mm file with  h file on the destination folder   Fixing that issue fixed the error

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I use to face that issue when the module  file  m  is not in the target that I am working with

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I had the same problem when I use admob library  I fixed it changing  Architectures  to  Standard architectures armv7  armv7s  without including 64-bit

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I received the  Undefined symbols for architecture armv7   error when trying to compile a project that had the target build setting for  C   Standard Library  set to  libc     necessary as the project was using some features from C   11   and the project included a sub-project that had the same setting set to  libstdc     or compiler default as it is currently    Changing the sub-project s  C   Standard Library  setting to libc   fixed it  but only after first setting the deployment target for the sub-project to 5 0 or above  5 0 is necessary for libc

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Go to your project  click on Build phases  Compile sources  Add GameCenterManager m to the list

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Probably some classes are missing from your target  This usually happens when you rename remove add new classes files to your project  To fix add the newly added classes to some targets   Select the class in the Project Navigator  right sidebar    open the Utilities sidebar  right sidebar   from the Utilities select the File Inspector  file like icon   under the Target Membership tab tick your targets  This is all to avoid the  Remove reference  and add again with ticking  Add to targets  trick   So  Select Class -  Utilities  File Inspector  -  Target Membership -  Tick the targets you want

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I had this issue  when installing shareKit  It worked in the simulator  but not on the device  I removed -all load from the Other Linker Flag and everything works fine in both simulator and iphone device

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rename your m file  which includes methods funcs  to mm or vice versa will fix your problem  mine solved renaming mm to m or m to mm

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Another possible cause of  undefined symbol  linker errors is attempting to call a C function from a  mm file   In this case you ll need to use extern  C        when you import the header files   Linker error calling C-Function from Objective-C

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I give you more suggestions that you can check when other common suggestions are not help   If you link with other project libxxx a  you might sometimes meet strange problem which you can find the symbol with tools like nm but they just can not find the symbols in ld  Then you should check if the two projects are built in the same flags  some of them may affect the binary format    check c   compiler  check c   dialect setting  check c   runtime type support   -frtti -fnortti  check if there is  a with the same name appears elsewhere  could be beyond the wanted file in the link path list  remove them

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I had a similar issue and I had to check  Build Active Architecture Only  on each of the Project configurations  Debug  Release and Deployment  and in the Build Settings of the Target

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I was facing the same problem when I included one third party framework   The issue got resolved when I removed armv7s from the Valid Architectures entry in Build Settings of the target  it starts working

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There is usually a alias without the version identifier that is linked to the current version  in this case libz dylib is linked to libz 1 2 5 dylib   Use the base alias instead of the versioned one

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Common Causes  The common causes for  Undefined symbols for architecture armv7  are    You import a header and do not link against the correct library  This is common  especially for headers for libraries like QuartzCore since it is not included in projects by default  To resolve    Add the correct libraries in the Link Binary With Libraries section of the Build Phases  If you want to add a library outside of the default search path you can include the path in the Library Search Paths value in the Build Settings and add -l library name without lib and suffix   eg  for libz a use -lz  to the Other Linker Flags section of Build Settings   You copy files into your project but forgot to check the target to add the files to  To resolve    Open the Build Phases for the correct target  expand Compile Sources and add the missing  m files  If this is your issue please upvote Cortex s answer below as well   You include a static library that is built for another architecture like i386  the simulator on your host machine  To resolve    If you have multiple library files from your libraries vendor to include in the project you need to include the one for the simulator  i386  and the one for the device  armv7 for example   Optionally  you could create a fat static library that contains both architectures         Original Answer   You have not linked against the correct libz file  If you right click the file and reveal in finder its path should be somewhere in an iOS sdk folder  Here is mine for example      Developer Platforms iPhoneOS platform Developer SDKs iPhoneOS4 3 sdk usr lib   I recommend removing the reference and then re-adding it back in the Link Binary With Libraries section Build Phases of your target

[ios] Undefined symbols for architecture armv7

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