Re: [Boost-build] [Mac XCode 3.1.1][boost_1_37_0] use MaxOSX10.4u.sdk

Subject: Re: [Boost-build] [Mac XCode 3.1.1][boost_1_37_0] use MaxOSX10.4u.sdk
From: Michael Jackson (mike.jackson_at_[hidden])
Date: 2008-11-11 09:13:15

On Nov 11, 2008, at 8:19 AM, Jeff Flinn wrote:

> How do I specify that the osx 10.4 universal sdk is used when building
> boost_1_37_0 on Max OSX 10.5.5 and XCode 3.1.1.
>
> Using:
>
> bjam --toolset=darwin architecture=combined link=static debug  
> release stage
>
> uses the 10.5 sdk, which causes problems when our app links with
> boost::filesystem.
>
> Thanks, Jeff

Interesting, What issues are you having with the link stage? By using  
the 10.4uSDK you are basically saying that your application should  
only work on 10.4. If it works on 10.5 you are lucky.

If you want to be able to run on 10.4 and 10.5 then you need to set  
the SDK to 10.5 but the deployment target to 10.4 so that GCC performs  
weak linking to the SDKs.

from the following web page: <http://public.kitware.com/Bug/view.php?id=6195 
 >
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Adjusting the SDK value has this effect.

"The name or path of the base SDK being used during the build. The  
product will be built against the headers and libraries located inside  
the indicated SDK. This path will be prepended to all search paths,  
and will be passed through the environment to the compiler and linker."

And for deployment target:

"Code will load on this and later versions of Mac OS X. Framework APIs  
that are unavailable in earlier versions will be weak-linked; your  
code should check for null function pointers or specific system  
versions before calling newer APIs." This can be set by using the "- 
mmacosx-version-min" flag, as in -mmacosx-version-min=10.4

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_________________________________________________________
Mike Jackson                  mike.jackson_at_[hidden]
BlueQuartz Software                    www.bluequartz.net
Principal Software Engineer                  Dayton, Ohio