-Objc Other linker flags gives duplicate symbol error - ios
I am using Unrar4iOS.Framework. It works fine but when I add -Objc other linker flags. it gives me duplicate error.
duplicate symbol __Z12CallbackProcjlll in:
Library/Developer/Xcode/DerivedData/SARUnArchiveANY-fgljekydpkmvrlgapbahtfvvhsdl/Build/Intermediates/SARUnArchiveANY.build/Debug-iphonesimulator/SARUnArchiveANY.build/Objects-normal/x86_64/Unrar4iOS.o
/My Project/SARUnArchiveANY-master/SARUnArchiveANY/vendor/Frameworks/Unrar4iOS.framework/Unrar4iOS(Unrar4iOS.o)
duplicate symbol _OBJC_IVAR_$_Unrar4iOS.header in:
Library/Developer/Xcode/DerivedData/SARUnArchiveANY-fgljekydpkmvrlgapbahtfvvhsdl/Build/Intermediates/SARUnArchiveANY.build/Debug-iphonesimulator/SARUnArchiveANY.build/Objects-normal/x86_64/Unrar4iOS.o
My Project/SARUnArchiveANY-master/SARUnArchiveANY/vendor/Frameworks/Unrar4iOS.framework/Unrar4iOS(Unrar4iOS.o)
duplicate symbol _OBJC_IVAR_$_Unrar4iOS.flags in:
Library/Developer/Xcode/DerivedData/SARUnArchiveANY-fgljekydpkmvrlgapbahtfvvhsdl/Build/Intermediates/SARUnArchiveANY.build/Debug-iphonesimulator/SARUnArchiveANY.build/Objects-normal/x86_64/Unrar4iOS.o
My Project/SARUnArchiveANY-master/SARUnArchiveANY/vendor/Frameworks/Unrar4iOS.framework/Unrar4iOS(Unrar4iOS.o)
I had require to add use Objc flag to use other library.
If you are specifying the -all_load or -Objc flag and the static libraries has the same symbol name of classes in your project,you’ll see these “duplicate symbol” errors in linking time.
reason why?
This flag causes the linker to load every object file in the library that defines an Objective-C class or category. While this option will typically result in a larger executable (due to additional object code loaded into the application), it will allow the successful creation of effective Objective-C static libraries that contain categories on existing classes.
from Apple official document.
In your project, Now, 3 symbol in Unrar4iOS.o has been crashed.
For example on your first duplicate symbol error log,
__Z12CallbackProcjlll symbol crashed in
(1) Library/Developer/Xcode/DerivedData/SARUnArchiveANY-fgljekydpkmvrlgapbahtfvvhsdl/Build/Intermediates/SARUnArchiveANY.build/Debug-iphonesimulator/SARUnArchiveANY.build/Objects-normal/x86_64/Unrar4iOS.o
(2) /My Project/SARUnArchiveANY-master/SARUnArchiveANY/vendor/Frameworks/Unrar4iOS.framework/Unrar4iOS(Unrar4iOS.o)
and the same pattern will go for the second and third duplicate symbol.
duplicate symbol __Z12CallbackProcjlll in:
Library/Developer/Xcode/DerivedData/SARUnArchiveANY-fgljekydpkmvrlgapbahtfvvhsdl/Build/Intermediates/SARUnArchiveANY.build/Debug-iphonesimulator/SARUnArchiveANY.build/Objects-normal/x86_64/Unrar4iOS.o
/My Project/SARUnArchiveANY-master/SARUnArchiveANY/vendor/Frameworks/Unrar4iOS.framework/Unrar4iOS(Unrar4iOS.o)
duplicate symbol _OBJC_IVAR_$_Unrar4iOS.header in:
Library/Developer/Xcode/DerivedData/SARUnArchiveANY-fgljekydpkmvrlgapbahtfvvhsdl/Build/Intermediates/SARUnArchiveANY.build/Debug-iphonesimulator/SARUnArchiveANY.build/Objects-normal/x86_64/Unrar4iOS.o
My Project/SARUnArchiveANY-master/SARUnArchiveANY/vendor/Frameworks/Unrar4iOS.framework/Unrar4iOS(Unrar4iOS.o)
duplicate symbol _OBJC_IVAR_$_Unrar4iOS.flags in:
Library/Developer/Xcode/DerivedData/SARUnArchiveANY-fgljekydpkmvrlgapbahtfvvhsdl/Build/Intermediates/SARUnArchiveANY.build/Debug-iphonesimulator/SARUnArchiveANY.build/Objects-normal/x86_64/Unrar4iOS.o
My Project/SARUnArchiveANY-master/SARUnArchiveANY/vendor/Frameworks/Unrar4iOS.framework/Unrar4iOS(Unrar4iOS.o)
So, To summary your project symptom, Now, in your project,Unrar4iOS.framework and SARUnArchiveANY library crashes each-other with three duplicated symbol in : Unrar4iOS object file.
Plus, below is the SARUnArchiveANY git repository introduction.
it already specified SARUnArchiveANY library contains Unrar4iOS.
SARUnArchiveANY
A very useful library for Unarchiving the .zip, .rar, .7z files for iOS.
Simply An Integration of the following libraries :
Unrar4iOS
SSZipArchive
LZMA SDK (7z)
from https://github.com/saru2020/SARUnArchiveANY
To solve the problem, I recommend this link.
http://atnan.com/blog/2012/01/12/avoiding-duplicate-symbol-errors-during-linking-by-removing-classes-from-static-libraries
you could solve the problem because I did it before already.
Related
Duplicate symbol error when adding NSManagedObject subclass, duplicate link
I was trying to create NSManagedObject subclasses (2 related entities) automatically in Xcode. They are generated like this: However, before I do anything further, when I tried to build and run it, a link error occur, as shown: duplicate symbol _OBJC_CLASS_$_Photo in: /Users/Kefeng/Library/Developer/Xcode/DerivedData/Photomania-aellrakjngugnzcgrleiytvrfvyt/Build/Intermediates/Photomania.build/Debug-iphonesimulator/Photomania.build/Objects-normal/x86_64/Photo+CoreDataClass.o duplicate symbol _OBJC_METACLASS_$_Photo in: /Users/Kefeng/Library/Developer/Xcode/DerivedData/Photomania-aellrakjngugnzcgrleiytvrfvyt/Build/Intermediates/Photomania.build/Debug-iphonesimulator/Photomania.build/Objects-normal/x86_64/Photo+CoreDataClass.o duplicate symbol _OBJC_CLASS_$_Photography in: /Users/Kefeng/Library/Developer/Xcode/DerivedData/Photomania-aellrakjngugnzcgrleiytvrfvyt/Build/Intermediates/Photomania.build/Debug-iphonesimulator/Photomania.build/Objects-normal/x86_64/Photography+CoreDataClass.o duplicate symbol _OBJC_METACLASS_$_Photography in: /Users/Kefeng/Library/Developer/Xcode/DerivedData/Photomania-aellrakjngugnzcgrleiytvrfvyt/Build/Intermediates/Photomania.build/Debug-iphonesimulator/Photomania.build/Objects-normal/x86_64/Photography+CoreDataClass.o ld: 4 duplicate symbols for architecture x86_64 clang: error: linker command failed with exit code 1 (use -v to see invocation) I tried several times by creating new projects and do the same thing. My original intention is to add some custom methods into those to subclasses. But when I add anything into e.g. Photo+CoreData.h/m, the same error as above showed up. I found some answers about the "double include" or "save files to the wrong directory", but I didn't do that. Anybody have any idea about this?
If you do not generate managed object subclass automatically, then don't forget to check "Codegen" settings for an Entity in Data Model Inspector:
Edit: Thanks to some help from #iPeter, found the following: After doing Editor > Generate NSManagedObject files, if you trash the files BEFORE building, your project should build no problems. Then #import "myManagedObjectName+CoreDataClass.h" (where the MO name is the one in the entity inspector in core data) into any classes where you require those Managed Objects. In other words, you don't require any of the actual ManagedObject files in your folder. Xcode keeps the generated ones in your Derived Data folder. If for some reason you need those files to remain in your file directory, the following workaround will work. Go to your Target and delete the CoreDataClass sources in your Compile Sources. Leaving you with this: Most of the new attributes / relationships I added after the initial generation of ManagedObject subclasses were available as properties after a build. In one case where I renamed an existing relationship, I had to do Editor > Generate NSManagedObject Subclasses again, then I trashed the new files in my folder, built, and everything worked OK. Just wrote a blog post that includes this info for anybody interested.
You should delete all these entities, change "Codegen" settings to "Manual/None" for them in Data Model Inspector, and generate entities again. It works good! You don't need to remove +CoreDataClass.h files from Compile Source. You don't need to mark entities as abstract. You don't need to generate classes by yourself. You should change only "Codegen" settings and regenerate entities automatically.
late post ... but for me was simply a copy paste of an entity, Xcode does not seem to change the original class name associated with the entity (observed on Xcode 9.0.1)
You need to remove the CoreData related sub class generated by yourself, and you can keep the #import line with those classes, now all those files will be generated automatically when build the project.
I recently tried the above answer and it failed. Somehow, Xcode was still generating the files. I solved it using the following method: Mark all entities as Abstract Build Remove Abstract flag Build Success ! This sounds like a bug in Xcode...
Duplicate symbol found
I have just imported MailCore2 into my project and I have followed all the steps that they have stated, but I am still getting an issue. duplicate symbol _hmac_md5_final in: XYZ/Debug-iphonesimulator/libetpan-ios.a(md5.o) ABC/libs/libsmbclient.a(hmacmd5.o) duplicate symbol _hmac_md5 in: XYZ/Debug-iphonesimulator/libetpan-ios.a(md5.o) ABC/libs/libsmbclient.a(hmacmd5.o) ld: 2 duplicate symbols for architecture x86_64 From what I can understand, _hmac_md5 and _hmac_md5_final appear in both of the files libetpan-ios.a * libsmbclient.a. In other posts people state that I need to remove one of the links or rename. I am using KxSMB and MailCore2 so I have no idea how to do any of these. I have tried methods in other posts as much as I can follow them but: I don't understand where I need to go. I try them but end up getting far more errors.
duplicate symbol _XBAnimationInterpolatorEaseInOut
I've created a single view iOS app. Added pod 'XBPageCurl'. When I add #import "XBPageCurlView.h" to any view controller I get this error duplicate symbol _XBAnimationInterpolatorEaseInOut in: /Users/alexander/Library/Developer/Xcode/DerivedData/CurlTest-fphbvwtzauotgidxuqzdympohxqz/Build/Intermediates/CurlTest.build/Debug-iphoneos/CurlTest.build/Objects-normal/arm64/ViewController.o /Users/alexander/Library/Developer/Xcode/DerivedData/CurlTest-fphbvwtzauotgidxuqzdympohxqz/Build/Products/Debug-iphoneos/libPods-XBPageCurl.a(XBAnimation.o) ld: 4 duplicate symbols for architecture arm64 This is not happening with a test project from github. Any idea how to get rid of it?
In build settings set "No Common Blocks" to NO
I removed any reference of interpolator block and moved the logic from it to - (BOOL)step:(NSTimeInterval)dt
Apple Mach-O Link
I got an error while compiling my code. The issue identifier labels it as 'Apple Mach-O Link Linker command failed'. I have no clue what this is so I have not been able to find a solution. duplicate symbol _OBJC_METACLASS_$_XYZFlipsideViewController in: /Users/studentuse/Library/Developer/Xcode/DerivedData/RSC- aardgrngtzicssfffcbdqsezpqmv/Build/Intermediates/RSC.build/Debug- iphonesimulator/RSC.build/Objects-normal/i386/XYZAppDelegate.o /Users/studentuse/Library/Developer/Xcode/DerivedData/RSC- aardgrngtzicssfffcbdqsezpqmv/Build/Intermediates/RSC.build/Debug- iphonesimulator/RSC.build/Objects-normal/i386/XYZFlipsideViewController.o ld: 6 duplicate symbols for architecture i386 clang: error: linker command failed with exit code 1 (use -v to see invocation) //This line has the mistake What is the problem with the code? (This is only part of the code.)
The problem is that you have defined the implementation of the class XYZFlipsideViewController twice, and the linker can't figure out which definition you meant: duplicate symbol _OBJC_METACLASS_$_XYZFlipsideViewController The two places it is defined in are these two object files: XYZAppDelegate.o XYZFlipsideViewController.o There are two possible explanations: You have a #implementation XYZFlipsideViewController ... #end block in both of the source files XYZAppDelegate.m and XYZFlipsideViewController.m, or You have the #implementation ... #end block inside a header file which is #include/#imported by both of those source files In the first case, the solution is to remove one of the #implementation blocks. In the second case, the solution is to move the #implementation block from the header into the source file, but keep the #interface block in the header file. It's important to understand the distinction between #interface and #implementation -- the former says "Here is the name of a class, the names of its instance variables, and the names of its member functions", whereas the latter says "Here are all the definitions of the class's properties and member functions".
Make sure and check your actual project directory for multiple files of the file it says you have duplicates of. Sometimes I forget to click send To trash vs remove reference when deleting and re creating files. I am not sure this is your problem, but I have had similar problems like this before. Good Luck! ^^
SPManagedObject creating "duplicate symbol" error
Simperium is giving me the following error: ld: duplicate symbol [REDACTED]/Simperium.framework/Simperium(SPManagedObject.o) and [OTHER-REDACTED]/Build/Intermediates/MyApp.build/Debug-iphonesimulator/MyApp.build/Objects-normal/i386/SPManagedObject.o Any idea what causes this duplicate symbol bug? (I put REDACTED in there so it's not specific to my app)
You'll see this error if you accidentally auto-generate .h and .m files for the SPManagedObject entity in the model editor. You should only auto-generate files for your own entities, since Simperium.framework provides the SPManagedObject class for you.