i am using cmake 2.8.0 on mac os x 10.6.2 with xcode 3.2.1 for generating 
.xcodeproj files for a large cross platform project. 

internally, .xcodeproj package files neatly distinguish project from user data 
information (such as debug settings) in separate files: project.pbxproj and 
user.pbxuser. in there, file references are tracked by hex ids: 

  104043E30104043E30104043 /* main.cpp */ 

now it happens, that each time i sync to head of the repository (with typically 
only a handful files changed) and recreate the project, cmake selects a 
complete new set of hex ids for its project.pbxproj file. as a result, 
user.pbxuser (while it does not get overwritten by cmake) is rendered no longer 
useful and is subsequently reset by xcode to default. 

is there a way to preserve those hex ids (or my debug setting for that matter)? 
maybe cmake could be configured with a "seed hex ref" from which all others are 
derived in a consistent manner. 
[on win_vx90 this works - maybe refs are stored by path rather than id] 

thank you.
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