[CMake] Configure Mac OS X for 32-bit

[Michael Wild]

Ahh, you want a release build to be i386 AND ppc and your debug build to be just ppc? Use different binary trees then. Simple as that. If you're not satisfied with that, put a feature request for CMAKE_OSX_ARCHITECTURES_<CONFIG> in the bug tracker...

Michael

On 2. May, 2010, at 23:39 , Tron Thomas wrote:

> Hello Werner,
> It is not just a simple matter of setting the architectures to either i386 or ppc.  For debug, the project should create an architecture specific build.  For release, the project should build an universal binary.
> The help documentation for CMake mentions a property call OSX_ARCHITECTURES_DEBUG which sounds like it should do the trick for setting the architectures needed for a debug build.  I have tried using this property and it doesn't work for me.  I wonder if there might be some bugs in CMake around setting the proper architectures for different build types on Mac OS X.
> 
> I could trying using the -m32 compiler option and see how that works.  I would just expect there should be a more direct way to solve this problem.  I'm also concerned that applying the option might cause an error.  I believe that CMake is going to configure the project to use the -arch x86_64 flag, and I'm not sure how well things will work if the -arch x86_64 is used with the -m32 flag.
> 
>> Hi Thomas,
>> 
>> On 5/2/10 5:41 PM, Tron Thomas wrote:
>>   
>>> Before when I was using an earlier version of CMake, it would configure
>>> the project to build a 32-bit version of all the project target's
>>> regardless of which version of Mac OS X I was using.  It would also
>>> build just the platform specific version of the targets for a debug build.
>>> 
>>> Now that I have upgraded to CMake version 2.8.1, CMake wants to
>>> configure the project's targets to build for 64-bit on Mac OS X 10.6.
>>> 
>>> The only way I've found so far to make Mac OS X 10.6 build 32-bit, is to
>>> modify the CMAKE_OSX_ARCHITECTURES to include i386.  However, if I set
>>> CMAKE_OSX_ARCHITECTURES to only i386, then it will build create an Intel
>>> version of all targets when I build on a PowerPC system.  That means I
>>> won't be able to run and test the targets on that platform.
>>> 
>>> I'm trying to get things back to where they were before I upgraded to
>>> CMake 2.8.1.  I want it to configure Xcode to build 32-bit targets, with
>>> architecture specific version for debug builds.
>>> 
>>> How can someone accomplish this?
>>>     
>> why not set this option when you call cmake? so:
>> 
>> cmake -DCMAKE_OSX_ARCHITECTURES=386 path-to-source
>> 
>> on your 10.6 system and
>> 
>> cmake -DCMAKE_OSX_ARCHITECTURES=ppc path-to-source
>> 
>> on your old system (that is, if you use the command line cmake).
>> 
>> Alternatively you could add the -m32 option to gcc like this
>> 
>> export CC="gcc -m32"
>> cmake path-to-source
>> 
>> on your 10.6 system where a 32 bit application should then be build
>> (according e.g.
>> http://www.cyberciti.biz/tips/compile-32bit-application-using-gcc-64-bit-linux.html
>> , which should also be true for Mac OS X 10.6).
>> 
>> Regards,
>> Werner
>> 
>>   
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