[Cmake] Re: Carbon, Cocoa, X

[Chris Scharver]

I already have my own FindOpenGL.cmake that I use specifically to 
address differences between building with X11 and building with Cocoa. 
In particular, I don't want X11 libs linked into the Cocoa application 
at all. Currently they are linked even if they're not used. Currently, 
all the X11 stuff is found when CMake configures OpenGL. 
FindOpenGL.cmake could grab whatever extra windowing libs are required, 
whether it's X11 or the Cocoa frameworks (but not both!) I define an 
OPENGL_APPLE_USE_X11 option within FindOpenGL.cmake, but some of my 
previous mails about that should be in the archives. There are 
definitely some ugly tricks involved, but it does work properly with 
CMake 1.8.

Maybe the windowing-related modules (FLTK, GLUT, OpenGL, Qt) should all 
check the desired windowing implementation. For Carbon and Cocoa, they 
only need to link the appropriate frameworks. For X11 they can use the 
FindX11 module.

It does throw in overhead since you have to check for which windowing 
system is being used for a given project, but it would be wonderful to 
have a consistent approach in CMake modules for doing this. It really 
shows the power of CMake when I demonstrate how effortlessly I can 
switch between different build configurations!

Chris

On Apr 2, 2004, at 9:35 AM, Bill Hoffman wrote:

> It should probably be fixed at the CMake level.
> Ken and I talked about it a bit, and the problem is that
> OSX is really several distinct platforms.   So, we should
> treat it that way.
>
> Something like this:
>
> CMake/Modules/Platforms/Darwin.cmake
> SET(CMAKE_APPLE_CARBON_DEVEL 1 CACHE "using cabon development")
> SET(CMAKE_APPLE_COCO_DEVEL 0 CACHE "using coco development")
> SET(CMAKE_APPLE_X11_DEVEL 0 CACHE "using X11 development")
>
> Then change all of the modules in CMake/Modules that refer to
> APPLE, to check for which flavor of apple it should be looking for.
>
>
> -Bill
>
> At 10:13 PM 3/31/2004, Yves Starreveld wrote:
>> Bill,
>>
>> I have been working on the multiple different builds on OSX problem.
>>
>> When building for X11, we need to use different libs for opengl, tcl 
>> and tk than when building for the other two.
>>
>> Should I add this support at the level of CMake, so that on OSX, it 
>> finds installed frameworks for Tk and Tcl for the Carbon/Cocoa 
>> builds, and also tcl and tk libs for the X11 builds, or should I just 
>> make it work at the VTK level, so that when USE_X11 is switched on, 
>> the OpenGL Framework is not used, but the -lGL, etc are used?
>>
>> It would be nice to finally sort this out cleanly, since it appears 
>> more and more folks are using this stuff now.
>>
>> Yves
>
>
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--
Chris Scharver
Electronic Visualization Laboratory
The University of Illinois at Chicago
Ph: 312-996-3002   FAX: 312-413-7585
<http://www.evl.uic.edu/scharver/>