Hi,
On Sun, 10 Sep 2006 13:36:12 +0200 (CEST)
Meino Christian Cramer <[EMAIL PROTECTED]> wrote:
> If I set "X" by default in /etc/make.conf...what happens to programs,
> which simply doesn't know anything about "X" ... for example
> "basename" (...yes, I know, "basename" is an builtin in most
> shells...just an example).
They ignore it. Ebuilds basically just use a few functions to determine
whether a certain USE flag is or is not set. Developers use this for
making the script in the ebuild behave differently. So if there's no
check for a certain USE flag, it will just have no consequences.
> Will make.conf override /usr/portagte/<category>/<progrname>/*.ebuild
> ? If so, what happens, if the gentoo developpers have set "-X"
> intentionally in the *ebuild file and I have set "X" (globally!) in
> make.conf.
Not in that sense. As I said, ebuilds don't have "default flags", just
your system has. If a certain USE flag combination is considered bad
(or just concurrent) by an ebuild's developer, it just has to be
sorted out by the script in the ebuild. In fact, /etc/make.conf
(and /etc/portage/package.use) cannot override ebuild scripting logic.
The logic just respects a few settings in these.
> Currently I am a little anxious to set "X" (or unset it or set/unset
> any other USE flag in make.conf due to its global character).
I can understand that. I think it is advised to use "X" for a machine
that is used as a desktop. You can check what would happen by including
it by setting USE as (temporary) environment variable:
$ USE="X" emerge -pvN world
this would show any package affected by such a change. Same goes for
unsetting flags ("-blah"). Before actually emerging packages for real,
enter the flags to your make.conf.
For package specific settings, use /etc/portage/package.use. This
overrides /etc/make.conf w/ regard to USE flags. Again, you can set and
unset them there.
Note that there is a default for USE flags in your profile. To start
from scratch (not advised for newcomers), you can prefix
your /etc/make.conf's USE setting with "-*". That would disable all
default USE flags from the profile. See "man portage" for details on
the files involved.
As an example, my /etc/make.conf's USE is just:
USE="-* nptl nptlonly ssl zlib jpeg png alsa ncurses pic nls pam"
All the other flags are configured per-package.
> On the other side I dont like to compile qt three times for example,
> due of missing USE flags...(initial compilation, openssl was
> missing, opengl was missing).
Yes, more possibilities to configure packages lead to more
possibilities to misconfigure them :-) BTW, I *did* tell that "-*"
isn't the way to go for everyone, right? ;-)
-hwh
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