On Wed, Mar 3, 2010 at 8:15 AM, Eric Noulard <eric.noul...@gmail.com> wrote:
> 2010/3/3 David Cole <david.c...@kitware.com>: > > The CMake generator for Xcode simply uses object pointers as the seed for > > those hex ids: that's why they change every time you run cmake. It's also > > what makes it easy to guarantee that those ids are unique without having > a > > data structure to track it. > > Re-using the same ids would be possible, but it would add complexity to > the > > xcode generator, and the ids would have to be cached and tracked somehow. > > It's a fairly tall order... If you have the time to propose how to do it, > > perhaps submitting a feature request and a patch to the bug tracker, I > would > > be happy to review it. > > Don't know in which case Hex id are used (and I'm not an Mac OS user) but > may be it would be possible to derive those id as a simple hash function > (like http://sites.google.com/site/murmurhash/) > of something which somehow unique but invariant > like the filename + path + project name + etc... > > Since this kind of function should be fast, may be you do not even > have to cache the hexid. > Theoretically there may be some collision but occurence probability > should be very low. > > My 2 cents idea. > > All good ideas... I do not have time or funding to work on these ideas in any sort of near term time frame... Patches are welcome. David
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