Re: [gentoo-portage-dev] /etc/make.profile/use.defaults

[Pieter Van den Abeele <pvdabeel@gentoo.org>]

On 12 May 2004, at 17:19, Andrew Gaffney wrote:

>> I've come across another issue. 'emerge -epvt xfree' shows that 
>> python wants to install tcl and tk because of the 'tcltk' USE flag 
>> where my program doesn't. That USE flag is not defined in my 
>> /etc/make.profile/make.defaults or /etc/make.conf. 'ufed' shows that 
>> it is defined in /etc/make.profile/use.defaults. I've never come 
>> across this file before. What does it do?
>
> Nevermind. From 'man portage':
>
> use.defaults
>     Here  we  DO  NOT  define  the  default  USE flags, but the 
> so-called
>     auto-USE flags.  This rather unknown portage feature activates a 
> USE
>     flag if a specific package is installed and the flag  was  not  
> explicitly
>     deactivated.  This file contains the associations between USE 
> flags and
>     packages that trigger the auto-USE feature.
>
>     In other words, if we never put "sdl" or "-sdl" into our USE, but 
> we have
>     media-libs/libsdl emerged, then portage automagically sticks "sdl" 
> into our
>     USE for us.
>
>     Format:
>     - comments begin with #
>     - one USE flag per line with a list of DEPEND atom bases
>
>     Example:
>     # media-libs/libsdl will activate "sdl"
>     sdl        media-libs/libsdl
>     # activate tcltk only if we have both
>     # dev-lang/tcl and dev-lang/tk
>     tcltk      dev-lang/tcl   dev-lang/tk
>
> That makes sense, but shouldn't Portage not use these when operating 
> with the '--emptytree' flag since it pretends that nothing is 
> installed?

I think that with 'installed' in this case they also include 'scheduled 
for installation' (although I'm not 100% sure). For instance If portage 
schedules tcl and tk in an emptytree, then the tcltk useflag will be 
enabled for packages having IUSE="tcltk" that are added to the schedule 
afterwards.

Pieter 


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