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Quoting "Kevin F. Quinn" <kevquinn@g.o>: |
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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 and |
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libsdl not installed then the || () would be satisfied by "opengl? ( |
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virtual/opengl )". Your src_configure() example above properly sets |
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--enable-opengl. However, the DEPEND string that you quoted pulls |
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libsdl instead. |
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|
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> and you have the same result, which means the originally quoted syntax |
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> is redundant. The only advantage it has is that it looks a little bit |
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> prettier - but I'd argue the logic is clearer in the re-written version. |
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> |
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> I guess the question remains, though - should that syntax be in EAPI=0 |
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> or not... |
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> |
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> -- |
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> Kevin F. Quinn |
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> |
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