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Setting up weak-linking in Xcode, as described in TN2064

Subject: Setting up weak-linking in Xcode, as described in TN2064
From: Rick Mann <email@hidden>
Date: Thu, 28 Feb 2008 14:38:53 -0800
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Hi. I've just read TN2064, http://developer.apple.com/technotes/tn2002/tn2064.html . I'd like to set up weak-linking in my app, but I'm not clear on where to set some of the variables.

I have my Carbon app project, and it links against another project (a C ++ application framework) that produces a statically-linked library. Both projects share a single .xcconfig file.

Can set things in the .xcconfig like MAC_OS_X_VERSION_MIN_REQUIRED? Does Xcode automatically define build settings in as preprocessor macros in the source, too?

Really I'm asking, how do I configure my Xcode project(s) to weak-link 10.5 APIs and hard-link 10.4 and earlier?

TIA,

--
Rick

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