Sorry I know this has been covered all over the place, only I can't fix this to save my life.
If someone could explain clearly what I might have done and what I might be able to do to fix this I would be forever grateful.
Here is my error:
Command /Xcode 4/Platforms/iPhoneOS.platform/Developer/usr/bin/llvm-gcc-4.2 failed with exit code 1
ld: duplicate symbol _OBJC_IVAR_$_sunnyHillsTL._tileMap in /Users/kahanejosh/Library/Developer/Xcode/DerivedData/workingTitle-cawhuhbkmwcesmbqxvkbkbatdbze/Build/Products/Debug-iphoneos/libcocos2d libraries.a(sunnyHillsTL.o) and /Users/kahanejosh/Library/Developer/Xcode/DerivedData/workingTitle-cawhuhbkmwcesmbqxvkbkbatdbze/Build/Intermediates/workingTitle.build/Debug-iphoneos/workingTitle.build/Objects-normal/armv7/sunnyHillsTL.o
Ld /Users/kahanejosh/Library/Developer/Xcode/DerivedData/workingTitle-cawhuhbkmwcesmbqxvkbkbatdbze/Build/Products/Debug-iphoneos/workingTitle.app/workingTitle normal armv7
cd "/Users/kahanejosh/Documents/iPhone:Mac Dev/Working Title/workingTitle"
setenv IPHONEOS_DEPLOYMENT_TARGET 3.0
setenv PATH "/Xcode 4/Platforms/iPhoneOS.platform/Developer/usr/bin:/Xcode 4/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin"
"/Xcode 4/Platforms/iPhoneOS.platform/Developer/usr/bin/llvm-gcc-4.2" -arch armv7 -isysroot "/Xcode 4/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.2.sdk" -L/Users/kahanejosh/Library/Developer/Xcode/DerivedData/workingTitle-cawhuhbkmwcesmbqxvkbkbatdbze/Build/Products/Debug-iphoneos -F/Users/kahanejosh/Library/Developer/Xcode/DerivedData/workingTitle-cawhuhbkmwcesmbqxvkbkbatdbze/Build/Products/Debug-iphoneos -filelist /Users/kahanejosh/Library/Developer/Xcode/DerivedData/workingTitle-cawhuhbkmwcesmbqxvkbkbatdbze/Build/Intermediates/workingTitle.build/Debug-iphoneos/workingTitle.build/Objects-normal/armv7/workingTitle.LinkFileList -dead_strip -all_load -ObjC -miphoneos-version-min=3.0 -framework CoreGraphics -framework Foundation -framework OpenGLES -framework QuartzCore -framework UIKit -framework AudioToolbox -framework OpenAL -lz -framework AVFoundation "-lcocos2d libraries" -o /Users/kahanejosh/Library/Developer/Xcode/DerivedData/workingTitle-cawhuhbkmwcesmbqxvkbkbatdbze/Build/Products/Debug-iphoneos/workingTitle.app/workingTitle
ld: duplicate symbol _OBJC_IVAR_$_sunnyHillsTL._tileMap in /Users/kahanejosh/Library/Developer/Xcode/DerivedData/workingTitle-cawhuhbkmwcesmbqxvkbkbatdbze/Build/Products/Debug-iphoneos/libcocos2d libraries.a(sunnyHillsTL.o) and /Users/kahanejosh/Library/Developer/Xcode/DerivedData/workingTitle-cawhuhbkmwcesmbqxvkbkbatdbze/Build/Intermediates/workingTitle.build/Debug-iphoneos/workingTitle.build/Objects-normal/armv7/sunnyHillsTL.o
collect2: ld returned 1 exit status
Command /Xcode 4/Platforms/iPhoneOS.platform/Developer/usr/bin/llvm-gcc-4.2 failed with exit code 1
It looks like you have two targets set up and your source is getting used in both. So, you create a static library with the sunnyHillsTL class that gets put into libcocoas2d libraries.a and then you are using the same object file as well. Either don't directly use the class in your target (don't add the class to the target) if you're using the library, or don't have this class be compiled as part of the static library.
Seems like you have two instance variables named «tileMap» in your «sunnyHillsTL» class...
install Command Line Tools from your Xcode.
in Xcode -> Preferences -> Downloads -> Components ->Command Line Tools
Related
I know this Question has been asked many times before, but none has solved my problem uptill now. I know that this error occurs when you got multiple copies of your file in project.
I tried to clean the build, delete any LoginController.m file in Compile Sources and then build. Fine - no errors. When I added my LoginController.m file in Complie resources, compiler again gave the same error.
Next I what I tried is delete all .m files from Compile Sources, clean and rebuild successfully, and added each .m file very carefully. Again same error has been raised. I did not find any duplicate file, then why the heck is this happening?
Please someone guide me. Thanks alot.
EDIT:
Error is:
Ld /Users/svp/Library/Developer/Xcode/DerivedData/TryAgain-dhbbyywxclvxfodbunqysmmfefcl/Build/Products/Debug-iphonesimulator/TryAgain.app/TryAgain normal i386
cd /Users/svp/Desktop/TryAgain
setenv MACOSX_DEPLOYMENT_TARGET 10.6
setenv PATH "/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin"
/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/clang -arch i386 -isysroot /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator5.0.sdk -L/Users/svp/Library/Developer/Xcode/DerivedData/TryAgain-dhbbyywxclvxfodbunqysmmfefcl/Build/Products/Debug-iphonesimulator -L/Users/svp/Desktop/TryAgain/TryAgain -L/Users/svp/Desktop/TryAgain/../CorePlot_1.0/Binaries/iOS -F/Users/svp/Library/Developer/Xcode/DerivedData/TryAgain-dhbbyywxclvxfodbunqysmmfefcl/Build/Products/Debug-iphonesimulator -filelist /Users/svp/Library/Developer/Xcode/DerivedData/TryAgain-dhbbyywxclvxfodbunqysmmfefcl/Build/Intermediates/TryAgain.build/Debug-iphonesimulator/TryAgain.build/Objects-normal/i386/TryAgain.LinkFileList -mmacosx-version-min=10.6 -Xlinker -objc_abi_version -Xlinker 2 -ObjC -all_load -fobjc-arc -D__IPHONE_OS_VERSION_MIN_REQUIRED=50000 -framework MediaPlayer -lz -framework AVFoundation -framework MobileCoreServices -framework SystemConfiguration -framework CFNetwork -framework QuartzCore -framework UIKit -framework Foundation -framework CoreGraphics -lCorePlot-CocoaTouch -o /Users/svp/Library/Developer/Xcode/DerivedData/TryAgain-dhbbyywxclvxfodbunqysmmfefcl/Build/Products/Debug-iphonesimulator/TryAgain.app/TryAgain
ld: duplicate symbol _OBJC_CLASS_$_LoginController in /Users/svp/Library/Developer/Xcode/DerivedData/TryAgain-dhbbyywxclvxfodbunqysmmfefcl/Build/Intermediates/TryAgain.build/Debug-iphonesimulator/TryAgain.build/Objects-normal/i386/LoginController.o and /Users/svp/Library/Developer/Xcode/DerivedData/TryAgain-dhbbyywxclvxfodbunqysmmfefcl/Build/Intermediates/TryAgain.build/Debug-iphonesimulator/TryAgain.build/Objects-normal/i386/Navigator.o for architecture i386
Command /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/clang failed with exit code 1
Your error message says that the binaries created from both LoginController.m and Navigator.m define an implementation for your LoginController class. It sometimes happens that this is because of a shared header file that contains implementation logic. Check your Navigator.h/.m for references to a LoginController.
i am trying to implement this: http://www.hatzlaha.co.il/150842/FAST-Corner-V2 in my app. They share complete compiling project that is doing what I want. I am trying to use it in my app but I got stuck in compiling my application after copying function.
I got this error from compiler:
Ld /Users/wojciechradomski2/Library/Developer/Xcode/DerivedData/ARmgr-bxkvnxdnsjbaioahqhygfsmofpxn/Build/Products/Debug-iphoneos/ARmgr.app/ARmgr normal armv6
cd /Users/wojciechradomski2/Documents/xCode/AR/ARmgr
setenv IPHONEOS_DEPLOYMENT_TARGET 4.0
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/llvm-g++-4.2 -arch armv6 -isysroot /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.3.sdk -L/Users/wojciechradomski2/Library/Developer/Xcode/DerivedData/ARmgr-bxkvnxdnsjbaioahqhygfsmofpxn/Build/Products/Debug-iphoneos -L/Users/wojciechradomski2/Documents/xCode/AR/ARmgr/ARmgr/opencv_device/lib -F/Users/wojciechradomski2/Library/Developer/Xcode/DerivedData/ARmgr-bxkvnxdnsjbaioahqhygfsmofpxn/Build/Products/Debug-iphoneos -filelist /Users/wojciechradomski2/Library/Developer/Xcode/DerivedData/ARmgr-bxkvnxdnsjbaioahqhygfsmofpxn/Build/Intermediates/ARmgr.build/Debug-iphoneos/ARmgr.build/Objects-normal/armv6/ARmgr.LinkFileList -dead_strip -lstdc++ -lz -miphoneos-version-min=4.0 -framework OpenGLES -framework AssetsLibrary -framework MobileCoreServices -framework MediaPlayer -framework QuartzCore -framework CoreVideo -framework CoreMedia -framework AVFoundation -framework Accelerate -framework UIKit -framework Foundation -framework CoreGraphics -lcv -lcxcore -o /Users/wojciechradomski2/Library/Developer/Xcode/DerivedData/ARmgr-bxkvnxdnsjbaioahqhygfsmofpxn/Build/Products/Debug-iphoneos/ARmgr.app/ARmgr
Undefined symbols for architecture armv6:
"fast9_detect_nonmax(unsigned char const*, int, int, int, int, int*)", referenced from:
-[CameraViewController captureOutput:didOutputSampleBuffer:fromConnection:] in CameraViewController.o
ld: symbol(s) not found for architecture armv6
collect2: ld returned 1 exit status
As readme file says I need only to import fast.h, and I am doing it.
I checked all libraries, imports and frameworks - I have them all.
The above error displays even with someting like this:
fast9_score(NULL, NULL, NULL, NULL, NULL);
After removing this line everything compiles fine.
Any ideas what I am missing or doing wrong?
From my cursory glance, the missing function is defined in fast.cc. So make sure you have it in your project, and it gets compiled and linked with your desired target.
Edit: A hint: if you get missing symbols in the linker, just grep for the files which contain that symbol. You may find the one that defines it... I just did a "grep -r fast9_detect_nonmax *" in the source directory of the project you linked in your post, and found the file.
I am getting Apple Mach-O Linker Id error, while compiling the iphone app. And getting below error
Ld
"/Users/adminbluepal/Library/Developer/Xcode/DerivedData/Tiger-czyksblsmfqdqybamuutemvjbdek/Build/Products/Debug-iphonesimulator/Tiger
Dev.app/Tiger Dev" normal i386
cd /Users/adminbluepal/Desktop/Dir-Tiger_latest
setenv MACOSX_DEPLOYMENT_TARGET 10.6
setenv PATH "/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin"
/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc-4.2
-arch i386 -isysroot /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator4.3.sdk
-L/Users/adminbluepal/Library/Developer/Xcode/DerivedData/Tiger-czyksblsmfqdqybamuutemvjbdek/Build/Products/Debug-iphonesimulator
-F/Users/adminbluepal/Library/Developer/Xcode/DerivedData/Tiger-czyksblsmfqdqybamuutemvjbdek/Build/Products/Debug-iphonesimulator
-filelist "/Users/adminbluepal/Library/Developer/Xcode/DerivedData/Tiger-czyksblsmfqdqybamuutemvjbdek/Build/Intermediates/Tiger.build/Debug-iphonesimulator/Tiger.build/Objects-normal/i386/Tiger
Dev.LinkFileList" -Xlinker
--no-demangle -mmacosx-version-min=10.6 -Xlinker -objc_abi_version -Xlinker 2 -liLibs -framework AVFoundation -framework AudioToolbox -framework CoreMedia
-framework Foundation -framework GameKit -framework OpenGLES -framework
QuartzCore -framework Security
-framework SystemConfiguration -framework UIKit -lz -o "/Users/adminbluepal/Library/Developer/Xcode/DerivedData/Tiger-czyksblsmfqdqybamuutemvjbdek/Build/Products/Debug-iphonesimulator/Tiger
Dev.app/Tiger Dev"
ld: library not found for -liLibs
collect2: ld returned 1 exit status
Command
/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc-4.2
failed with exit code 1
Please help me out of this
Thank you,
Madan Mohan
Yesterday i had this problem.... cleared that error with the help of this answer. it may help you also...
You probably don't have the CoreGraphics.framework added to your frameworks list.
To make sure, click the "Frameworks" folder on Xcode. If the framework isn't listed on the table to the right, you'll need to add it by right-clicking the Frameworks folder, chooseing "Add Existing Framework..." and then choosing it from the list.
Source stack overflow previous question
Sounds like you're trying to use the iLibs library (Google says it's something for game development). XCode cannot properly link to it. Try adding their Framework to your project, or read the help docs of the library for help with its setup. Alternatively, see if you can remove the "-liLibs" linker flag in your build settings, if you aren't using the library.
i downloaded a project and i want to try it, but when i'm trying to compile it i get always this error:
Build TuneIn Radio of project TuneInRadio with configuration Release
Ld "build/Release-iphonesimulator/TuneIn Radio.app/TuneIn Radio" normal i386
cd /Users/marco/Downloads/projects
setenv PATH "/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin"
/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc-4.2 -arch i386 -isysroot /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator4.2.sdk -L/Users/marco/Downloads/projects/build/Release-iphonesimulator -L/Users/marco/Downloads/projects -L/Users/marco/Downloads/projects/TuneInRadio-iphonesimulator -L/Users/marco/Downloads/projects/MMS/build/Release-iphonesimulator -L/Users/marco/Downloads/projects/ffmpeg/build/Release-iphonesimulator -F/Users/marco/Downloads/projects/build/Release-iphonesimulator -F/Users/marco/Downloads/projects -filelist "/Users/marco/Downloads/projects/build/TuneInRadio.build/Release-iphonesimulator/TuneIn Radio.build/Objects-normal/i386/TuneIn Radio.LinkFileList" -lTuneInRadio -llibmms -lffmpegLib -ObjC -Xlinker -objc_abi_version -Xlinker 2 -framework Foundation -framework CoreGraphics -framework QuartzCore -framework CoreFoundation -framework AudioToolbox -framework MediaPlayer -framework CoreLocation -framework UIKit -lz.1 -framework SystemConfiguration -framework MapKit -o "/Users/marco/Downloads/projects/build/Release-iphonesimulator/TuneIn Radio.app/TuneIn Radio"
ld: warning: directory '/Users/marco/Downloads/projects/TuneInRadio-iphonesimulator' following -L not found
ld: warning: directory '/Users/marco/Downloads/projects/MMS/build/Release-iphonesimulator' following -L not found
ld: library not found for -lTuneInRadio
collect2: ld returned 1 exit status
Command /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc-4.2 failed with exit code 1
Any advice on what kind of steps i can follow to reach the error ?
Thank's
The error indicates the problem:
ld: library not found for -lTuneInRadio
this means that your build/make is trying to find a library (called libTuneInRadio) to compile this program you're trying to build but it can't find it in the paths (the default ones + the ones described by the '-L' options on gcc call).
Not knowing any more about what you're compiling/building makes it impossible to say precisely what's happening other than you're missing this library.
Given the name of the library, it sounds like it should be part of the project you're trying to build (or maybe there is a related TuneInRadio-lib project), so I would suggest reading the README or BUILDING or similarly named file that might have come with the project to determine how to successfully compile this program.
I had the same problem compiling the project for iOS simulator, the problem is that the source code you downloaded does not contain the libTuneRadio.a library for TuneInRadio-iphonesimulator, so first create that folder and second move the libTuneRadio.a from TuneInRadio-iphoneos to the recently created folder. That should make it.
My application compiled successfully but it crashes as it cannot find any CasseteAudioPlayer class, so i guess there is still something wrong.
I've been fighting this for a few hours now and I'm getting fed up. My project builds fine with a debug simulator build , release simulator build and a debug device build, but for some reason it won't build with a release device build. I have a static library containing my cocos2d code, and another static library containing a game engine I wrote.
Because the game engine contains categories, I had to use the all_load linker flag to get it to run. Without this flag, the code builds fine. However, I get an unrecognized selector sent to instance exception when I try to run the game.
Here's the first build error:
ld: duplicate symbol _OBJC_CLASS_$_FontLabel in /Users/helixed/Dropbox/Documents/Development/iPhone/Cocos2d/build/Release-iphoneos/libcocos2d.a(FontLabel.o) and /Users/helixed/Dropbox/Documents/Development/iPhone/Cocos2d/build/Release-iphoneos/libcocos2d.a(FontLabel.o)
Ld build/Shapeless.build/Release-iphoneos/Shapeless.build/Objects-normal/armv6/Shapeless normal armv6
cd /Users/helixed/Dropbox/Documents/Development/iPhone/Apps/Shapeless
setenv IPHONEOS_DEPLOYMENT_TARGET 4.0
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/llvm-g++-4.2 -arch armv6 -isysroot /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.0.sdk -L/Users/helixed/Dropbox/Documents/Development/iPhone/Apps/Shapeless/build/Release-iphoneos -F/Users/helixed/Dropbox/Documents/Development/iPhone/Apps/Shapeless/build/Release-iphoneos -filelist /Users/helixed/Dropbox/Documents/Development/iPhone/Apps/Shapeless/build/Shapeless.build/Release-iphoneos/Shapeless.build/Objects-normal/armv6/Shapeless.LinkFileList -dead_strip -ObjC -all_load -miphoneos-version-min=4.0 /Users/helixed/Dropbox/Documents/Development/iPhone/Cocos2d/build/Release-iphoneos/libChipmunk.a /Users/helixed/Dropbox/Documents/Development/iPhone/Cocos2d/build/Release-iphoneos/libcocos2d.a /Users/helixed/Dropbox/Documents/Development/iPhone/BlackHawk/build/Release-iphoneos/libBlackHawk.a -framework Foundation -framework UIKit -framework CoreGraphics -framework QuartzCore -framework OpenGLES -framework OpenAL -framework AVFoundation -framework AudioToolbox -lz -framework iAd -o /Users/helixed/Dropbox/Documents/Development/iPhone/Apps/Shapeless/build/Shapeless.build/Release-iphoneos/Shapeless.build/Objects-normal/armv6/Shapeless
ld: duplicate symbol _OBJC_CLASS_$_FontLabel in /Users/helixed/Dropbox/Documents/Development/iPhone/Cocos2d/build/Release-iphoneos/libcocos2d.a(FontLabel.o) and /Users/helixed/Dropbox/Documents/Development/iPhone/Cocos2d/build/Release-iphoneos/libcocos2d.a(FontLabel.o)
collect2: ld returned 1 exit status
Command /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/llvm-g++-4.2 failed with exit code 1
And here's the second:
Ld build/Shapeless.build/Release-iphoneos/Shapeless.build/Objects-normal/armv7/Shapeless normal armv7
cd /Users/helixed/Dropbox/Documents/Development/iPhone/Apps/Shapeless
setenv IPHONEOS_DEPLOYMENT_TARGET 4.0
setenv PATH "/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin:/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin"
/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/llvm-g++-4.2 -arch armv7 -isysroot /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.0.sdk -L/Users/helixed/Dropbox/Documents/Development/iPhone/Apps/Shapeless/build/Release-iphoneos -F/Users/helixed/Dropbox/Documents/Development/iPhone/Apps/Shapeless/build/Release-iphoneos -filelist /Users/helixed/Dropbox/Documents/Development/iPhone/Apps/Shapeless/build/Shapeless.build/Release-iphoneos/Shapeless.build/Objects-normal/armv7/Shapeless.LinkFileList -dead_strip -ObjC -all_load -miphoneos-version-min=4.0 /Users/helixed/Dropbox/Documents/Development/iPhone/Cocos2d/build/Release-iphoneos/libChipmunk.a /Users/helixed/Dropbox/Documents/Development/iPhone/Cocos2d/build/Release-iphoneos/libcocos2d.a /Users/helixed/Dropbox/Documents/Development/iPhone/BlackHawk/build/Release-iphoneos/libBlackHawk.a -framework Foundation -framework UIKit -framework CoreGraphics -framework QuartzCore -framework OpenGLES -framework OpenAL -framework AVFoundation -framework AudioToolbox -lz -framework iAd -o /Users/helixed/Dropbox/Documents/Development/iPhone/Apps/Shapeless/build/Shapeless.build/Release-iphoneos/Shapeless.build/Objects-normal/armv7/Shapeless
ld: duplicate symbol _OBJC_CLASS_$_FontLabel in /Users/helixed/Dropbox/Documents/Development/iPhone/Cocos2d/build/Release-iphoneos/libcocos2d.a(FontLabel.o) and /Users/helixed/Dropbox/Documents/Development/iPhone/Cocos2d/build/Release-iphoneos/libcocos2d.a(FontLabel.o)
collect2: ld returned 1 exit status
Command /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/llvm-g++-4.2 failed with exit code 1
This is the only think keeping me from releasing, so I really appreciate the help.
Thanks.
I faced a similar problem, I had accidentally included (#import) the implementation file instead of the header file
When the compiler throws an error that 2 object files contain a duplicate symbol, check for how you have included (#import) the that duplicate symbol's class in the 2 implementation files.
I had this problem with adding both Facebook sdk and Dropbox sdk. The problem was both of the SDks are using having JSON lib so I removed one of them ans it works now.
Do you have it twice in your project structure? Check the left side of XCode and look through all the folders and make sure you don't have it in there multiple times.
Do you have a different set of device architectures (armv6, armv7, etc.) in your Release build than in your Debug build settings (either project, or target which overrides project settings)?
I think the solution to your problem lies in the unrecognized selector issue that you tried to solve using the -all_load flag. I use cocos2d-iphone in a static library and didn't need that flag. If you read up what it does, it should tell you that it's unlikely to be related to your problem:
What does the -all_load linker flag do?
It fixes linking to static libraries containing ONLY categories and NO classes. That certainly isn't true for cocos2d-iphone.
I recommend to figure out why you get unrecognized selector warnings without this flag. If necessary ask another question here.
You should also turn on the "Unrecognized Selector" build warning in the project's Build Settings, so that you get this warning while compiling as opposed to when it crashes while running the game (then it's too late and you wasted a lot of time). It's one of the settings I always turn on in an Xcode project.