Re: [gentoo-user] Re: revdep-rebuild wants to rebuild always dev-java/swt-3.2-r2

[Alan McKinnon <alan@linuxholdings.co.za>]

On Thursday 05 April 2007, Marc Blumentritt wrote:
> Thanks for the answers, but to be honest, I still do not get, what
> the problem is and how to solve it. Could someone explain me, what
> goes wrong, if I use a binary package like sun-jdk?

The problem is that you can't recompile sun-jdk.

Say you have package A which needs library B. You update library B to 
the next higher version, but neither library B nor it's ebuild is aware 
of other packages that use or may use it. Don't try and "fix" this - 
there be dragons...

revdep-rebuild might now detect that binary files in package A are still 
looking for old libs that have been replaced in the meantime. The 
solution is easy - recompile package A and the build process will find 
and link to the correct libraries that you now *do* have. But you can't 
do that with a third party binary app.

Remember that ebuild defines which *packages* they depend on, not the 
files in those packages. So it's quite possible that sun compiled 
something that would like to use lib-1.2.3.so and you have 
lib-1.2.5.so. It all still works nicely because the shared libraries 
system is designed to cope with this as an essential feature, but 
revdep-rebuild will complain.

You *could* get around the problem with a complex arrangment of 
symlinks, but then you'd have to maintain them. It's so much easier to 
just tell revdep-rebuild to ignore the binary package altogether, using 
Rumen and Neil's suggestions

alan


-- 
Optimists say the glass is half full,
Pessimists say the glass is half empty,
Developers say wtf is the glass twice as big as it needs to be?

Alan McKinnon
alan at linuxholdings dot co dot za
+27 82, double three seven, one nine three five
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