[gentoo-dev] Undocumented and unused USE variables

[Christoph Niethammer <christoph.niethammer@googlemail.com>]

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Hello.

Currently I am doing a from scratch installation of gentoo.

While setting up my USE flags I noticed, that some default USE flags in the 
default environment (default/linux/amd64/10.0/desktop/kde) are neither
documented (in /usr/portage/profiles/use.desc) nor used in IUSE by any package 
(amd64).

I am wondering if they are a leftover from older/outdated packages and could 
be removed.

Here is the list of USE flags I identified at my system:

* Undocumented use flags:
----------
amd64
consolekit
declarative
gdu
kipi
mudflap
nptlonly
pango
phonon
pppd
qt3support
sysfs
xorg

* Unused and undocumented USE flags:
----------
amd64
mudflap
sysfs


For those who want to search on their system I attached two scripts:
* find_undocumented_uses.sh : 
	searches for use flags which are active but not documenten in
	/usr/portage/profiles/use.desc.
* find_unused_uses.sh :
	Checks for given USE flags if they are found in any ebuild's IUSE statment

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