cocos2d for iPhone

A fast, easy to use, free, and community supported 2D game engine

1. 

   dnsolo
   Member

   Hi all,

   I'm getting the following error in Xcode which doesn't seem to make much sense...

   duplicate symbol _creditsOption in /Users/dnsolo/Downloads/Game/build/Game.build/Debug-iphonesimulator/Game.build/Objects-normal/i386/MenuScene.o and /Users/dnsolo/Downloads Game/build/Game.build/Debug-iphonesimulator/Game.build/Objects-normal/i386/GameAppDelegate.o

   I've checked the code and it's fine, there are no duplicate symbols in MenuScene or GameAppDelegate. I've done a 'clean all targets' but no joy. I've also tried deleting the entire build directory but that doesn't work either.

   Has anyone encountered this type of error before? I suspect I have a corrupted Xcode project and will have to rebuild it
   from scratch which I really don't want to do!

   cheers,

   dan

   Posted 2 years ago #
2. 

   dnsolo
   Member

   Quick update...I've rebuilt the entire project from scratch but still get the same error!!

   Duplicate symbol _creditsOption in /Users/dnsolo/Downloads/Game/build/Game.build/Debug-iphonesimulator/Game.build/Objects-normal/i386/MenuScene.o and /Users/dnsolo/Downloads Game/build/Game.build/Debug-iphonesimulator/Game.build/Objects-normal/i386/GameAppDelegate.o

   Any ideas?

   cheers,

   dan

   Posted 2 years ago #
3. 

   Clain
   Member

   Can you post your MenuScene.h/.m and GameAppDelegate.h/.m ?

   Posted 2 years ago #
4. 

   dnsolo
   Member

   Hi Clain,

   My 2 headers are:

   @interface GameAppDelegate : NSObject <UIApplicationDelegate> {
   UIWindow *window;
   NSArray *pickerValues;
   }

   @property (nonatomic, retain) NSArray *pickerValues;

   @end

   and...

   #import "OpponentSelection.h"
   #import "Menu1Option.h"
   #import "Credits.h"

   CGSize windowSize;

   NSArray *menuItems1MA;

   AtlasSprite *bg;
   Menu1Option *tournamentOption;
   Menu1Option *practiceModeOption;
   Menu1Option *settingsOption;
   Menu1Option *creditsOption;
   Credits *cs;

   @interface MenuScene : Scene {}
   @end

   @interface MenuLayer: Layer {}
   - (void)runTournament;
   - (void)runPracticeMode;
   - (void)runSettings;
   - (void)runCredits;
   @end

   The error I'm now getting is:

   Duplicate symbol _cs in /Users/dnsolo/Downloads/Game/build/Game.build/Debug-iphonesimulator/Game.build/Objects-normal/i386/MenuScene.o and /Users/dnsolo/Downloads Game/build/Game.build/Debug-iphonesimulator/Game.build/Objects-normal/i386/GameAppDelegate.o

   One thing to note, if I add the keyword 'extern' to the 'cs' reference (i.e extern Credits *cs;) the compiler error changes to:

   duplicate symbol _creditsOption in /Users/dnsolo/Downloads/Game/build/Game.build/Debug-iphonesimulator/Game.build/Objects-normal/i386/MenuScene.o and /Users/dnsolo/Downloads Game/build/Game.build/Debug-iphonesimulator/Game.build/Objects-normal/i386/GameAppDelegate.o

   Posted 2 years ago #
5. 

   Clain
   Member

   And what about the Credits.h file ? Any chance you defined/used Menu1Option *creditsOption; or Credits *cs; in there ?

   Posted 2 years ago #
6. 

   dnsolo
   Member

   No, my Credits.h code is below:

   #import <Foundation/Foundation.h>
   #import <UIKit/UIKit.h>
   #import "cocos2d.h"
   #import "SingletonSoundManager.h"

   AtlasSprite *bgCredits;
   AtlasSprite *previousMenuButton;
   ParticleSystem* emitter;

   @interface Credits : Scene {}
   @end

   @interface CreditsLayer : Layer {}
   - (void) returnToMenu;
   @end

   Posted 2 years ago #
7. 

   Clain
   Member

   If you haven't found the cause of the compiling error, my guess is you have used the same name for two of your variables throughout all your files (.h and .m). Is there any particular reason why you declare your variables as global instead of making them instance variables ?

   Posted 2 years ago #
8. 

   adunsmoor
   Member

   It looks like you need to add the "extern" keyword to your global variable declarations in your header. This tells the compiler not allocate space for the variable. Then make sure you *don't* have the extern key word in the file where those variables are actually defined.

   // myclass.h
   extern int global_counter;

   // myclass.m
   int global_counter = 0;

   Google "extern keyword c" for more details about how this works.

   Hope that helps.

   Posted 2 years ago #

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