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On 12/08/15 02:19 PM, Alexis Ballier wrote: |
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> On Wed, 12 Aug 2015 20:00:42 +0200 Ulrich Mueller |
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> <ulm@g.o> wrote: |
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> |
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>>>>>>> On Wed, 12 Aug 2015, Ciaran McCreesh wrote: |
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>> |
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>>>> pkg_pretend() { if use qt4; then required_use -qt5 else |
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>>>> required_use qt5 fi } |
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>> |
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>>> And how would the PM understand that -qt5 is conditional upon |
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>>> qt4? Such knowledge is required if it's supposed to |
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>>> auto-resolve stuff... |
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>> |
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>> Right, the above was too simple (and wrong). It should have |
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>> been: |
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>> |
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>> pkg_pretend() { use qt4 && use qt5 && required_use -qt5 use qt4 |
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>> || use qt5 || required_use qt4 } |
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> |
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> what is the difference ? |
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> |
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> pkg_pretend still needs to be executed to guess what useflags |
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> are enabled or not, which information is needed before |
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> dependency calculation |
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> |
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> or are we talking about moving pkg_pretend into dependency |
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> calculation? |
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> |
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pkg_pretend is already executed during dependency calculation in |
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portage, although this doesn't seem to actually be specified in PMS: |
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"The pkg_pretend function is called some unspecified time before a |
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(possibly hypothetical) normal sequence." as per PMS sec.9.2 |
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