I have problems integrating finalizer to xcode project I get the warnings like this
Warning: Ignored symbols were detected in this build. In some cases ignored symbols could cause incorrect finalization. This may be caused by different static libraries containing the same symbol.
warning: no debug symbols in executable (-arch armv7)
Along with a long list like this
Ignored symbol '_int_update' defined at address 0xfb2cc -- it was already defined at 0xd2c94
Ignored symbol '_init' defined at address 0xfcbd8 -- it was already defined at 0xfcba4
Ignored symbol '_update' defined at address 0xfcbe4 -- it was already defined at 0xfcbb0
Ignored symbol '_final' defined at address 0xfcbf0 -- it was already defined at 0xfcbbc
Any help or suggestions would be appreciated.
If there are 2 or more symbols defined among all the relocatable object files having the same name, the linker will choose one of them and the other symbols are ignored.
If these symbols have different types, it may lead an incomprehensible bug at run-time.
There is an example in chapter 7 of Computer Systems_A Programmer-'s Perspective:
Related
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.
I am having problems updating to a particular Ruby version. The failed install is prompting me to run brew doctor, to which I get the following output.
Is this something that I need to correct? And if so how?
Pauls-MacBook-Pro:~ pauldriver$ brew doctor
Warning: Passing arbitrary symbols to `option` is deprecated: :static
Symbols are reserved for future use, please pass a string instead
Warning: Passing arbitrary symbols to `option` is deprecated: :static
Symbols are reserved for future use, please pass a string instead
Warning: Passing arbitrary symbols to `option` is deprecated: :static
Symbols are reserved for future use, please pass a string instead
Warning: Passing arbitrary symbols to `option` is deprecated: :"build-examples"
Symbols are reserved for future use, please pass a string instead
Warning: Passing arbitrary symbols to `option` is deprecated: :"build-examples"
Symbols are reserved for future use, please pass a string instead
Warning: Passing arbitrary symbols to `option` is deprecated: :"build-examples"
Symbols are reserved for future use, please pass a string instead
Warning: Passing arbitrary symbols to `option` is deprecated: :"build-tests"
Symbols are reserved for future use, please pass a string instead
Warning: Passing arbitrary symbols to `option` is deprecated: :"build-tests"
Symbols are reserved for future use, please pass a string instead
Warning: Passing arbitrary symbols to `option` is deprecated: :"build-tests"
Symbols are reserved for future use, please pass a string instead
Your system is ready to brew.
They are warnings and the final line is the conclusion: Your system is ready to brew.
I wouldn't worry too much.
It looks like your Ruby version is newer than the one used to develop the version of Homebrew you have. Updating Homebrew (brew update) could fix the issues and remove the warnings.
In a static library project for iOS 6, some functions in a .c file is referenced by others, and therefore are considered global symbols, but should not be exposed to the user of this library.
How can I strip these function names out? Also, how can I hide those obj file names as well so that nobody could see the .o names in nm output?
I have tried to enable/set:
Deployment Postprocessing
Strip Debug Symbols During Copy
Strip Linked Product
Strip Stype: either 'Non-Global Symbols' or 'Debugging symbols'
Use Separate Strip
EDIT:
I see that there is another Build Setting item 'Additional Strip Flags'.
By adding in it a flag -R /path/to/symbol_list_file, strip command would remove symbols indicated in the file, or -s /path/to/exported_symbol_list_file -u to indicate interfaces and leaving undefined symbols at the same time.
No, you can't. A static library is simply a collection of object files and the object files within the static library have no special privileges over those using the static library.
You can obviously strip the final binary.
If you must hide symbols then they need to be static, which forces you to use fewer implementations files to allow the symbol to be shared, which is inconvenient.
I am porting a static library project composed entirely of "C" files to iOS and when I try to use the library in an application I get a bunch of undefined symbols.
The problem appears to be name decoration. For example, let's say I have the function:
unsigned int hello_world(int arg1, int arg2);
When I use "nm" to look at the .a file I see the following:
For file1.c where the function is implemented:
0000002c T __Z10hello_worldii
For file2.c that calls the function:
U __Z10hello_worldii
But for file3.c that also calls the function and for which the symbol is undefined I get:
U _hello_world
All three .c files are in the library project. The prototype is in a header file that is included by both file2.c and file3.c. Are the __Z10 and ii C++ name decorations? If so, why are these C files being compiled as C++?
EDIT:
Codo's question in regard to the "Compile Sources As" setting led me to try changing it to "C" from "According to File Type". This forced all files to be compiled as "C" and resolved the function name mangling problem but I still had 42 undefined symbols which almost all turned out to be variables. I noticed that there were no initializers for these variables so I added an initializer to one of them and when I rebuilt the project that uses the library, I only had 3 undefined symbols. It appears that adding just one initializer to a variable enabled the linker to resolve all references to that modules variables. The 3 remaining undefined symbols appear to be yet another problem(s).
EDIT2:
Of the 3 remaining errors, 1 was an uninitialized variable from another module and 2 were in-lined functions that needed to be declared static.
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.