Quoting Georgi Georgiev <[EMAIL PROTECTED]>:
Quoting "Kevin F. Quinn" <[EMAIL PROTECTED]>:
On Thu, 22 Feb 2007 19:08:48 +0000
Ciaran McCreesh <[EMAIL PROTECTED]> wrote:
The example given in ebuild(5) is:
|| (
sdl? ( media-libs/libsdl )
svga? ( media-libs/svgalib )
opengl? ( virtual/opengl )
ggi? ( media-libs/libggi )
virtual/x
)
Took me a while to figure out why anyone would want to write that; the
key is that ebuild(5) says only one of the conditions is satisfied;
i.e. even if all the dependencies are present on the system, the
package will build only against the first matching dependency.
The way I see it, the ebuild has to cater for the dynamic situation
anyway, for example doing something like:
src_configure() {
use sdl &&
has_version media-libs/libsdl &&
vid_conf="--enable sdl" ||
use svga &&
has_version media-libs/svgalib &&
vid_conf="--enable svga" ||
use opengl &&
has_version virtual/opengl &&
vid_conf="--enable opengl" ||
use ggi &&
has_version media-libs/libggi &&
vid_conf="--enable ggi" ||
vid_conf="--enable x11"
...
econf ${vid_conf} ...
}
So the dependency could be re-written as:
sdl? ( media-libs/libsdl )
!sdl? ( svga? ( media-libs/svgalib )
!svga? ( opengl? ( virtual/opengl )
!opengl? ( ggi? ( media-libs/libggi )
!ggi? ( virtual/x ) ) ) )
What you wrote for the ebuild-side of the dephandling does not match
the expanded DEPEND string.
If you have all mentioned flags enabled, opengl already installed
and libsdl not installed then the || () would be satisfied by
"opengl? ( virtual/opengl )". Your src_configure() example above
properly sets --enable-opengl. However, the DEPEND string that you
quoted pulls libsdl instead.
Of course, since the DEPEND pulls libsdl, the src_configure() snippet
would set --enable-sdl instead. My bad, but if that really was your
intention there would have been no need for the has_version calls.
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