[Qt-interest] Mac deployment to 10.4

[Rush Manbert]

On Oct 9, 2009, at 12:29 PM, Dave Thorup wrote:
<snip>
>
> As others have already mentioned you'll need to download the Qt  
> sources and build the Qt libraries yourself using the 10.4 SDK as  
> well as targeting 10.4 ( MACOSX_DEPLOYMENT_TARGET=10. ).  You'll  
> also need to be sure that you build Qt as Universal Binaries in  
> order to target your G4 iBook.  We target Mac OS X 10.4 while  
> developing on 10.5 (and now 10.6), you just need to make sure that  
> you build your Qt libraries properly and get your project settings  
> correct as well.  Here are my notes on building Qt to target 10.4:
>
>> Qt needs some special configuration flags to work well with  
>> Leopard. The MACOSX_DEPLOYMENT_TARGET environment variable must be  
>> set to 10.4 (or 10.3 for earlier compatibility). Enter the  
>> following in Terminal before configuring Qt:
>> MACOSX_DEPLOYMENT_TARGET=10.4
>> export MACOSX_DEPLOYMENT_TARGET
>> Configure Qt with the following (note that this doesn't make the  
>> demos or examples which is much faster):
>> ./configure -nomake demos -nomake examples -dwarf2 -sdk /Developer/ 
>> SDKs/MacOSX10.4u.sdk -universal
>> This will ensure that source code is visible in Xcode when  
>> debugging. Add "-universal" to build a Universal Binary version of  
>> Qt.
>> You'll also need to set the following in your Qt pro file for your  
>> projects:
>> QMAKE_MACOSX_DEPLOYMENT_TARGET = 10.4
>> QMAKE_MAC_SDK=/Developer/SDKs/MacOSX10.4u.sdk
>> In order to view the Qt sources in the Xcode Debugger you'll need  
>> to double-click on the "bibblepro" executable in the Executables  
>> section of the Xcode project and select "Use <debug> suffix when  
>> loading frameworks." Where <debug> is selected from a popup menu.
>
> We use Qt 4.4.3, but it should be the same with Qt 4.5.
>

This is an old thread by now, but I would like to extend the  
discussion a little bit.

We need to support deployment on OS X 10.4 through 10.6, and on 10.6  
we need to support X86_64. We want to statically link our executables,  
so we want to build Qt to have static libraries. We develop on 10.6  
using the Xcode 3.2 toolset.

This seems to get us into a problematic area for Qt. The help for  
configure says in regard to the "-arch " setting:
     -arch <arch> ....... Build Qt for <arch>
                          Example values for <arch>: x86 ppc x86_64  
ppc64
                          Multiple -arch arguments can be specified,  
64-bit archs
                          will be built with the Cocoa framework.

and it says in regard to the "-cocoa" setting:
     -cocoa ............. Build the Cocoa version of Qt. Note that -no- 
framework
                          and -static is not supported with -cocoa.  
Specifying
                          this option creates Qt binaries that  
requires Mac OS X
                          10.5 or higher.

It would seem that if we specify "-arch X86_64" we implicitly specify  
"-cocoa" and "-framework" and we limit ourselves to deployment on 10.5  
and above.

But if we only build the 32 bit architectures, specify "-static", and  
omit "-cocoa", then we can't build 64 bit libraries.

What we would like is this:
	- static libraries
	- cocoa or carbon
	- each library supports ppc, x86, and x86_64 architectures (the 10.6  
notion of "universal")
	- deployable on 10.4, 10.5, and 10.6

but that doesn't look like it's possible. In fact, it looks as if I  
could reduce my requirements to this:
	- a single linked application
	- deployable on 10.4, 10.5, and 10.6

and still not be able to satisfy them!

Has anyone else solved/worked around these issues?

- Rush

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