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On Thu, 22 Feb 2007 19:08:48 +0000, Ciaran McCreesh |
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<ciaranm@×××××××.org> wrote: |
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> As has been discussed in the past, the only correct way of handling |
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> this from an ebuild perspective is lots of use && has_version calls |
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Which sounds like trying to mimic whatever the deps solver logic may |
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have been, no? So, why not just let the dep solver itself give the |
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right answer to the ebuild? It could well set a resolved DEPEND |
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variable (lets call it $RESOLVED_DEPEND for instance) in the ebuild |
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env, that one could query with some helper functions. |
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Example: |
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- DEPEND="cat/foo |
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|| ( |
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sdl? ( media-libs/libsdl ) |
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svga? ( media-libs/svgalib ) |
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opengl? ( virtual/opengl ) |
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ggi? ( media-libs/libggi ) |
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virtual/x |
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) |
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bar? ( cat/baz )" |
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- USE="sdl -svga opengl -ggi bar" |
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- media-libs/libsdl not installed, but virtual/opengl already |
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satisfied. |
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==> RESOLVED_DEPEND="cat/foo virtual/opengl cat/baz" |
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And in the ebuild: |
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if has_dep media-libs/libsdl ; then |
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myconf="${myconf} --enable-sdl" |
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elif has_dep media-libs/svgalib ; then |
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myconf="${myconf} --enable-svgalib" |
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Or even: |
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myconf=" |
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$(dep_enable media-libs/libsdl sdl) |
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$(dep_enable media-libs/svgalib) |
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..." |
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(where has_dep() and dep_enable() are helper functions, similar to |
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use() and use_enable() but for querying the $RESOLVED_DEPEND var) |
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> So, is there a legitimate reason for this complication to exist? Or |
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> should use? blocks being direct children of || ( ) be forbidden? |
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It's not clear to me what would be your prefered DEPEND syntax for the |
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ebuild(5) example you've quoted. Something like this maybe?: |
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sdl? ( media-libs/libsdl ) |
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!sdl? ( |
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svga? ( media-libs/svgalib ) |
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!svga? ( |
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... |
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(which is not really equivalent) |
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|
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-- |
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TGL. |
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-- |
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