[CMake] Linking against OS X Frameworks

[ML]

Hi Guys,

With all of your help and reading intensely though the documentation  
to understand each command. I am starting to really get this.

I am doing great now.

What is the command to force 32-bit carbon as now that I set 10.4 as  
my SDK and I am running on a 64 -bit machine I am getting errors like:

In file included from /Volumes/Data/jtsm/Checkout/Universal GUI/source/ 
thirdparty/OSX/MoreFilesX/MoreFilesX.c:80:
/Developer/SDKs/MacOSX10.4u.sdk/System/Library/Frameworks/ 
Carbon.framework/Headers/Carbon.h:20:6: error: #error 64-bit not  
supported

I wish Apple had decided to support 64-bit Carbon, but that is another  
thread all together.

-Jason


On Aug 9, 2009, at 2:30 PM, Michael Wild wrote:

>
> On 9. Aug, 2009, at 23:09, Mike Jackson wrote:
>
>> On Sun, Aug 9, 2009 at 3:07 PM, Michael Wild<themiwi at gmail.com>  
>> wrote:
>>>
>>> On 9. Aug, 2009, at 18:59, ML wrote:
>>>
>>>> Michael,
>>>>
>>>> Thank you for this example! It was really informative. Definitely a
>>>> missing piece in my knowledge thus far.
>>>>
>>>> One question:
>>>>
>>>> I get an error stating:
>>>>
>>>> CMake Error at CMakeLists.txt:70 (message):
>>>> MoreFilesX requires the SDK version to be not newer than 10.4u  
>>>> (10.6
>>>> detected)
>>>>
>>>> this comes from here:
>>>>
>>>>> # figure out Mac OSX SDK version (do not care for the u-suffix  
>>>>> in 10.4u)
>>>>> get_filename_component( SDK_VER ${CMAKE_OSX_SYSROOT} NAME )
>>>>> string( REPLACE ".sdk" "" SDK_VER ${SDK_VER} )
>>>>> string( REPLACE "MacOSX" "" SDK_VER ${SDK_VER} )
>>>>> string( REGEX REPLACE "[a-zA-Z]" "" SDK_VER ${SDK_VER} )
>>>>> # this REALLY needs the 10.4 SDK.
>>>>> if( ${SDK_VER} VERSION_GREATER 10.4 )
>>>>> message( SEND_ERROR "MoreFilesX requires the SDK version to be  
>>>>> not newer
>>>>> than 10.4u (${SDK_VER} detected)" )
>>>>> endif( ${SDK_VER} VERSION_GREATER 10.4 )
>>>>
>>>> So how do I turn around and set 10.4u if it is not automatically  
>>>> detected?
>>>>
>>>> It is like this:
>>>>
>>>> CMAKE_OSX_SYSROOT=/Developer/SDKs/MacOSX10.4u.sdk
>>>>
>>>> Best,
>>>>
>>>> -Jason
>>>>
>>>
>>> CMake by default detects the most current SDK. If you want to use a
>>> different one, you have to set it in the cache, by e.g. executing
>>>
>>> cmake -DCMAKE_OSX_SYSROOT=/Developer/SDKs/MacOSX10.4u.sdk
>>> -DCMAKE_OSX_DEPLOYMENT_TARGET=10.4 .
>>>
>>> in the build tree. Above command also sets  
>>> CMAKE_OSX_DEPLOYMENT_TARGET=10.4
>>> for consistency.
>>>
>>> Please note that it is supported (and meaningful) to have  
>>> different versions
>>> of the SDK and the deployment target (both of them may be newer  
>>> than the
>>> other, so "all combinations allowed"). However, this has  
>>> implications on
>>> compiling, linking and loading, which I can't remember just off  
>>> the top of
>>> my head.
>>>
>>> Michael
>>
>> the CMAKE_OSX_DEPLOYMENT_TARGET setting controls the "Weak Linking"
>> that OS  X does. It basically says what the minimum version of OS X
>> your program can run on.
>>
>>
>> the CMAKE_OSX_SYSROOT setting controls the "maximum" version of OS X
>> that your program can run on. By setting BOTH to 10.4 you are
>> basically saying that your program can run ONLY on OS X 10.4. Is that
>> what you want?
>>
>> If you link against a library that has a function in 10.5 that is not
>> in 10.4 then your program will likely crash. It is up to you to take
>> the necessary steps in your code to ensure this does not happen,  
>> maybe
>> by using an alternate function?
>>
>> If you read bug number 6195 you will get all the detailed  
>> explanations
>> you need plus all the history that will allow you to make an informed
>> decision about how to set those values:
>>
>> http://public.kitware.com/Bug/view.php?id=6195
>>
>> Mike
>
> According to this document http://developer.apple.com/documentation/DeveloperTools/Conceptual/cross_development/Configuring/configuring.html
>
> your information is partially wrong: CMAKE_OSX_SYSROOT gives you the  
> maximum SDK version from which you can USE features at built time.  
> All newer features will not be available. It doesn't say anything  
> about run time.
>
> CMAKE_OSX_DEPLOYMENT_TARGET, on the other hand, gives the minimum  
> version required to run the application. All the symbols that fall  
> in between these two versions (where CMAKE_OSX_DEPLOYMENT_TARGET has  
> to be lower or equal to CMAKE_OSX_SYSROOT) are weakly linked,  
> meaning their address is set to NULL and need to be tested at  
> runtime whether they are available (described here http://developer.apple.com/documentation/DeveloperTools/Conceptual/cross_development/Using/using.html#//apple_ref/doc/uid/20002000-1114537-BABHHJBC 
>  and here http://developer.apple.com/technotes/tn2002/tn2064.html)
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