On Tue, Jun 26, 2007 at 09:25:45AM -0400, Matthias Clasen wrote: > On Tue, 2007-06-26 at 15:26 +0200, Axel Thimm wrote: > > > > > > > Care to provide a concrete example of a symbol that has been added in a > > > stable series, breaking applications ? I can't think of any. > > > > http://www.google.com/search?q=g_assert_warning > > (2,460 which all seem to discuss the missing symbol in various higher > > stack packages) > > > > And according to the changelog you should be aware of that: > > Oh, I am aware of g_assert_warning. But it is not the example I asked > you for, since it was added in 2.5.3, in the middle of a development > series. That is not something that you will see in a released Fedora, > unless something unforeseen happens. But it made its way into the stable release nonetheless (there are very few references to odd versions in the google results above, and I know for sure I never used a development release when I encounterd this at ATrpms), so whether there was historically a development cycle doesn't matter, comparing the stable releases matters and the fact remains that: o Two different stable releases had a different set of symbols o These two stable releases had the same soname o One stable release (the younger one) was ABI-wise a superset of the older one So all these together give: There is backward compatibility in this project (OK), but certainly no forward compatibility (also OK, nobody and his cat even less care about forward compatibility, so why should you). And that brings up back to: o no ensured forward compatibility in libraries o still same soname o rpm and anything higher can't detect any lack of forward compatibility to force pulling in later versions of libraries Leading utlimatively again to o A security-updates repo can only be built against itself (itself = release + itself). -- Axel.Thimm at ATrpms.net
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