On Thu, 29 Nov 2012 17:09:34 +0100 justin <j...@gentoo.org> wrote: > On 29/11/12 16:51, Ian Stakenvicius wrote: [...] > > ..ok remind me again what the .pc files provide you? this is so > > that you can have slotted blas providers and various packages can > > choose their preferred one instead of having to use the eselected > > one? or... > > > > Not exactly. > The user can choose for each package newly by eselecting the wanted > implementation. This is the user side. From the pm side we ensure that > the choice is really respected by linking against package specific > names [1] instead of the generic ones e.g. libblas.so. And this can be > achieved in an easy way by using pkg-config. > > justin > > 1) > # eselect blas set atlas-threads > # pkg-config --libs blas > -lptf77blas -lm -latlas -lpthread > > # eselect blas set reference > # pkg-config --libs blas > -lrefblas >
This immediately bears the following questions: * How do you ensure the linked against implementation doesn't get depcleaned? revdep-rebuild maybe? * How do you let users configure the implementation to be used on a per package basis? Interrupt an emerge world to set the appropriate implementation for the next few packages?
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