[fixed]Compiling on Mac. Error on forward declarations.

[dreamwalker]

On "CIrrDeviceMacOSX.h"

Code: Select all

class NSWindow;
class NSOpenGLContext;
class NSBitmapImageRep;

Gives out these errors

Code: Select all

Redefinition of 'NSWindow' as a different kind of symbol
Redefinition of 'NSOpenGLContext' as a different kind of symbol
Redefinition of 'NSBitmapImageRep' as a different kind of symbol

Im on Mac 64bit using XCode 4.2 and Mac OS SDK 10.7.

I have tried using macros __cplusplus, removing the forward declarations and/or changing class to @class but it didn't fix the problem.

Has someone gone through this problem and fixed it. Please advise.

[hybrid]

Are you using the current stable version, or a more recent SVN/trunk version? Because we fixed a lot of errors with newer OSX versions for the upcoming Irrlicht 1.8. Irrlicht 1.7.3 will probably not compile under OSX 10.7

[dreamwalker]

Im using Irrlicht 1.7.2. I'll wait for Irrlicht 1.8 or grab from svn.

[dreamwalker]

Fixed it.

Solution:
I changed my compiler to LLVM GCC 4.2 from Apple LLVM Compiler 3.0.

It seems that there are issues with mixing C++ and Objective-C in Apple LLVM Compiler 3.0.
Irrlicht 1.7.2 is compatible with Mac if you use GCC compiler and not the faulty Apple compiler.

[Nadro]

If You use 10.7 or 10.6 SDK, You should also use Irrlicht from SVN, because 1.7.x have a problems with MacOS X Lion (eg. fullscreen doesn't work on my MacBook with NVIDIA GFX with 10.7 SDK). Switch to a GCC only fix compile issues, but it doesn't solve deprecated methods problems, which are removed from SVN version.

[dreamwalker]

Thanks for the heads up Nadro. I appreciate it. Cheers to Irrlicht and Mac.

[All8Up]

As a note, I wanted to get Irr compiling using the latest Os X sdk and also using Clang instead of Gcc since all my other code is working under that setup. After running into the issue with the class redefinitions, I poked into the problem and found a quick and simple solution. Wrap the class references as follows:

#ifndef __OBJC__
class NSWindow;
class NSOpenGLContext;
class NSBitmapImageRep;
#endif

All the C++ code see's the opaque pointers as intended and the ObjC code uses the proper definitions from foundation and appkit. Other than a couple of the demo's failing clean shutdown, everything works like a charm.

[riham]

BTW, these bugs are present in all three versions: 1.7, 1.8 and trunk.

[Nadro]

This bug will not exist any more after merge ogl-es with trunk, where we have reworked window manager.