[CMake] Configure Mac OS X for 32-bit

[Werner Smekal]

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


> 
> On 05/02/2010 01:58 AM, Michael Wild wrote:
>> Well, setting CMAKE_OSX_ARCHITECTURES to i386 AND ppc is going to get
>> you a universal build, both of the architectures being 32-bit. So,
>> what is it exactly that you want?
>>
>> Michael Wild
>>
>> On Sun, May 2, 2010 at 8:15 AM, Tron Thomas <tron.thomas at verizon.net
>> <mailto:tron.thomas at verizon.net>> wrote:
>>
>>     It looks like:
>>
>>     set (CMAKE_OSX_ARCHITECTURES "i386 ppc")
>>
>>     will build a universal binary for a debug build on any platform.
>>      How can someone configure things so that Xcode will build a
>>     platform specific debug version that is 32-bit?
>>
>>
>>
>>     On 05/01/2010 04:55 PM, Mike Jackson wrote:
>>
>>         You need to set the CMAKE_OSX_ARCHITECTURES to i386. The
>>         default build
>>         on snow leopard is 64bit where as on leopard it is 32 bit.
>>
>>         -----
>>         Mike Jackson                      www.bluequartz.net
>>         <http://www.bluequartz.net>
>>         Principal Software Engineer       mike.jackson at bluequartz.net
>>         <mailto:mike.jackson at bluequartz.net>
>>         BlueQuartz Software               Dayton, Ohio
>>
>>
>>         On May 1, 2010, at 15:33, Tron Thomas<tron.thomas at verizon.net
>>         <mailto:tron.thomas at verizon.net>>  wrote:
>>
>>          
>>
>>             I am writing a cross platform application using CMake that
>>             builds on
>>             Mac OS X.  I just upgraded to CMake 2.8-1.  When I
>>             configure and
>>             build my project on my Power Mac G5 system running Mac OS
>>             X 10.5.8,
>>             the project builds just fine.
>>
>>             When I try to configure the project on my MacBook Pro
>>             running Mac OS
>>             X 10.6.3, I get link errors because the project has been
>>             configured
>>             to build 64-bit applications and some of the needed
>>             libraries and
>>             frameworks the project links with are only 32-bit.
>>
>>             How can I configure my CMake scripts so that the project
>>             will build
>>             a 32-bit application on my MacBook Pro?
>>
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>>
>>
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> 
> 
> 
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