On 07-09-2012 20:36:02 +0100, Ciaran McCreesh wrote: > The correct fix for "not needing to rebuild" stuff is to SLOT libraries > like crazy, and have a SLOT per thing-we-don't-call-ABI. This then > needs := dependencies, so that packages can say "and remember which > SLOT I was built against". > > However, there are some packages that cannot easily be SLOTted to the > degree that we'd like. This is where sub-SLOTs come in. Given > sub-SLOTted packages dep:1/a and dep:1/b, this says "I'd like to have > slots 1a and 1b, but it's too difficult to allow 1a and 1b to be > installed at the same time". > > So suppose the user has pkg with a dependency upon dep, with slot 1 and > a := operator. They install pkg when dep:1/a is installed. The user > then installs dep:1/b. In an ideal world, dep:1/a would remain > installed in parallel with dep:1/b, but your friendly Gentoo developers > have decided it's not worth their time to allow this. Thus, dep:1/a has > to be uninstalled to allow dep:1/b to be installed. But this would > break pkg, since pkg needs dep:1/a. However, a clever dependency > resolver can note that reinstalling pkg would fix it, since dep:1/b > also satisfies pkg's slot 1 := dependency (but not the locked 1/a > dependency that the installed version of pkg has picked up).
Thanks. It seems we're there. At last. -- Fabian Groffen Gentoo on a different level
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