-Objc Other linker flags gives duplicate symbol error

Question

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.

Check the code where you are importing the framework using #import. Check whether you are importing .h or .m file — Arun, Oct 01 '16 at 11:46
If that doesn't work try removing and adding the framework again — Arun, Oct 01 '16 at 11:47
@Arun https://github.com/saru2020/SARUnArchiveANY.. ADD -ObjC in other linker flag — Mahavir, Oct 01 '16 at 12:05
@Mahavir OK, so update your question with the argument you are passing to `-force_load`. It has to include the full path to the library you want to load all the symbols from. — Droppy, Oct 01 '16 at 12:09
See [this answer](http://stackoverflow.com/a/25890484/3588973). — Droppy, Oct 01 '16 at 12:14

boraseoksoon · Answer 1 · 2016-10-01T12:09:03.213

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.

-Objc Other linker flags gives duplicate symbol error

1 Answers1