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On Friday 08 July 2011 18:39:04 Stroller did opine thusly: |
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> On 8 July 2011, at 16:19, Alan McKinnon wrote: |
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> > ... |
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> > easy. |
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> > |
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> > Two USE flags: gtk2 and gtk3 |
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> > |
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> > in ebuild: |
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> > |
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> > DEPEND=" |
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> > |
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> > gtk2? (x11-libs/gtk+:2) |
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> > gtk3? (x11-libs/gtk+:3) |
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> > |
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> > " |
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> > |
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> > in src-configure() write the code such that it establishes a |
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> > precedence |
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> > |
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> > If both flags are set, build against gtk+:3 |
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> > If only one flag is set, build against that toolkit |
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> > If no flags are set, do something appropriate. |
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> |
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> This is the way it was done for gtk vs. gtk2, but the bug has been |
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> updated since I first read it (over 24 hours ago) and apparently |
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> the Gnome team don't want the two separate flags in the future. |
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> |
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> I'm not really a gtk or Gnome (or X11) user, so I don't really know, |
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> but the two separate flags did strike me as a bit of an ugly / |
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> clumsy way of doing things. |
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It's also the only mechanism I know of to do it. |
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If the ebuild will support two toolkits and the choice of which to use |
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is based solely on a user's preference, there is only one way to |
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resolve that - a precedence list. There's no way around that. |
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Some global mechanism would be nice and could be useful in various |
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cases: |
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gtk+-2 vs gtk+-3 |
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openssl vs gnuts |
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mysql vs mariadb |
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Those are also virtuals. |
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-- |
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alan dot mckinnon at gmail dot com |
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