[CMake] Configure Mac OS X for 32-bit

[Richard Wackerbarth]

You might try this approach:
Since you want to use 32-bit on MacOSX 10.6, when in debug, set the architecture only in your particular case

cmake_minimum_required(VERSION 2.4)
PROJECT(Test)
IF (${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
   Message("${CMAKE_SYSTEM_VERSION}")
   STRING (REGEX MATCH "^[^.]+" __v ${CMAKE_SYSTEM_VERSION} )
   STRING (REGEX MATCH "[0-9][0-9]$" __version "00${__v}" )
   STRING (COMPARE GREATER ${__version} "09" _host_is_snow_leopard_or_newer )
   IF (${_host_is_snow_leopard_or_newer}) 
      IF (x${CMAKE_BUILD_TYPE} STREQUAL "xDebug")
         SET (CMAKE_OSX_ARCHITECTURES "i386")
      ENDIF (x${CMAKE_BUILD_TYPE} STREQUAL "xDebug")
   ENDIF (${_host_is_snow_leopard_or_newer})
ENDIF (${CMAKE_SYSTEM_NAME} MATCHES "Darwin")

ADD_EXECUTABLE(HelloWorld Hello)

or this approach

IF (${CMAKE_SYSTEM_PROCESSOR} STREQUAL "i386")
   SET (CMAKE_OSX_ARCHITECTURES "i386")
ENDIF (${CMAKE_SYSTEM_PROCESSOR} STREQUAL "i386")

Richard

On May 2, 2010, at 10:41 AM, 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?
> 
> 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> 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
>> Principal Software Engineer       mike.jackson at bluequartz.net
>> BlueQuartz Software               Dayton, Ohio
>> 
>> 
>> On May 1, 2010, at 15:33, Tron Thomas<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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