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