[Qt-interest] Mac OS X Leopard (10.5.x) and 4.5 - Backward compatibility to Tiger (10.4.x) ?

[Mike Jackson]

On 2009-03-08 20:55:59 -0400, Dan White <ygor at comcast.net> said:

> In the call to "configure", can I specify more than one item in the  
> "sdk" option like this :
> 
> ./configure \
> 	-prefix . \
> 	-prefix-install \
> 	-release \
> 	-static \
> 	-fast \
> 	-largefile \
> 	-exceptions \
> 	-accessibility \
> 	-stl \
> 	-qt-sql-sqlite \
> 	-no-qt3support \
> 	-no-phonon \
> 	-svg \
> 	-no-mmx \
> 	-no-webkit \
> 	-no-framework \
> 	-universal \
> 	-sdk "/Developer/SDKs/MacOSX10.4u.sdk /Developer/SDKs/MacOSX10.5.sdk"
> 
> I am building Qt 4.5.0 on a Leopard (10.5.x) box and want my  
> applications to run on Tiger (10.4.x) boxen as well.
> 
> Thanks.

Dan,
If you need to deploy on 10.4 then you will need to add the following 
gcc/g++ flags to your compile.

-mmacosx-version-min=10.4.

and leave the -sdk /Developer/SDKs/MacOSX10.5.sdk

This scenario will make sure your app can run on 10.4 and 10.5. IF you 
use the 10.4u SDK then the MAXIMUM version of OS X that would be 
officially supported is 10.4. It _may_ run on 10.5 but there is no 
guarantee.

Now, a few fun things:
  64 Bit builds Require Cocoa. Qt/Cocoa REQUIRES 10.5 Leopard. There is 
NO DEPLOYMENT to 10.4 Tiger.
  64 Bit builds Require Frameworks. Frameworks REQUIRES Dynamic Libraries.

So here is what you are "stuck" with for 64 Bit builds
   Universal Binary, Dylib based Frameworks with a -mmacosx-version-min=10.5.

Hope that helps.

Mike Jackson
Principal Software Engineer
Bluequartz Sofware (www.bluequartz.net)