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Adding box2d header causes a torrent of compiler errors

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By User



I am experiencing either an extremely weird error or a temporary loss of brain function.





I have a box2d / cocos project running in XCode. This all works fine but my code is currently a proof of concept "hack". Stage one of cleaning up the code is creating classes for various objects.





Now, if I create a brand new Objective C class (inherited off NSObject) as below it all compiles fine. As soon as I attempt to import the "Box2D.h" I receive a gazillion errors originating from the box2d library saying it cannot be built. 201 to be precise and it indicates no issues with the class itself. Can anyone shed any light? I have already tried a clean and rebuild as well as restarting XCode.





My super complicated class definition







#import "Box2D.h"



@interface test : NSObject



@end







An example compiler error thrown







Expected '=', ',', ';', 'asm' or '__attribute__' before 'b2Fixture' in /Users/..../libs/Box2D/Dynamics/b2Body.h




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Comments

  1. Tips For AllMarch 1, 2012 at 9:40 AM

    You need an Objective-C++ file for this, because Box2D is written in C++ and thus doesn't compile in Objective-C out of the box. Luckily, its just a matter of renaming your file from myClass.m to myClass.mm

    ReplyDelete
  2. Tips For AllMarch 1, 2012 at 9:40 AM

    A quick google turned up the header in question. It looks like C++ code. That means you'll need to compile as Objective-C++ if you want things to work. Probably you're not doing that now - the easy way is to change your file's extention to .mm.

    ReplyDelete

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