Re: [gentoo-dev] RFC about another *DEPEND variable

[Brian Harring <ferringb@gmail.com>]

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On Sat, Sep 23, 2006 at 10:34:03AM -0400, Mike Frysinger wrote:
> On Saturday 23 September 2006 10:24, Alin Nastac wrote:
> > I see only libraries in NEEDED and it is probably generated
> > automatically. There is no way for the automatic tools to discover the
> > dependency between pptpd and ppp version.
> 
> that gets back to ABI versus dynamic plugins ... we already know we'll need a 
> new DEPEND to track dlopen-ed plugins
> 
> > Besides, even if I would have somehow /usr/lib/ppp/2.4.3 in NEEDED file
> > of the pptpd, the amount of computation needed to discover which package
> > offers such thing would be prohibitive. The reciprocal operation (find
> > which packages use the old path before upgrade) would also be prohibitive.
> 
> no it wouldnt ... when you merge a package, you record all the SONAME's it 
> provides:
> scanelf -qRS "${D}" > SONAME
> 
> in fact, running `scanelf -qlpRS` doesnt take that long on my machine

Flush the cache... Makes a world of difference.  Additionally, he is 
talking about what is *done* with that data after the fact, iow other 
words walking the entire vdb to find all affected pkgs.  Can pretty 
much gurantee after a build that data isn't likely to be available 
(part of the reason portageq calls during building are slow).

Could collapse that into a simple mapping, but that introduces 
backwards compatibility issues...

~harring

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