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On 29/11/2016 04:15, Ian Zimmerman wrote: |
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> On 2016-11-29 01:55, Stroller wrote: |
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> |
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>>> [ebuild R ] dev-db/sqlitebrowser-3.8.0 USE="-qt5 {-test} (-qt4%*)" |
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>>> |
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>>> Does this mean the package will be rebuilt without any qt support at |
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>>> all? Why? |
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>> |
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>> No, I believe it means that the _option_ to enable or disable qt4 has |
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>> been removed. |
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> |
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> Well - notice the 'R'. So the package (or at least the version, see |
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> below) has not been changed since last time. |
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> |
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>> It could be that the package is always compiled with qt4, or that it's |
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>> always disabled, or that `make` detects it automatically. The best |
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>> things to look at are the ebuild and the changelog. |
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> |
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> There is no changelog for this package :-( |
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> |
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> In the ebuild, the only occurrence of the string "qt4" is: |
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> |
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> src_prepare() { |
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> # https://github.com/qingfengxia/qhexedit still bundled |
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> # x11-libs/qscintilla[qt4?,qt5?] still bundled |
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> # ^^^^ |
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> find libs/{antlr-2.7.7,qcustomplot-source} -delete || die |
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> cmake-utils_src_prepare |
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> } |
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> |
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> I don't think this is responsible for the emerge output. |
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> |
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> Is it possible for the ebuild to change (in particular, for USE flags to |
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> be removed) without a change in version number? |
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> |
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|
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Yes. |
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|
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It's quite common to have a change in an ebuild that makes no difference |
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at all to the files on disk if it's already emerged. Bumping the version |
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in that case forces a rebuild everywhere to give exactly the same result |
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= not good. |
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|
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If the package is not already merged on a given machine, then a new |
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install simply does what it should. |
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|
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Suppose you had a situation where a package had qt4 in USE but because |
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of the way it works it's not actually possible to install it without |
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qt4. Merging it with USE=qt4 would always proceed, and with USE=-qt4 |
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would always error out (you can get to this state gradually over time) |
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|
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In that case, removing the flag entirely from USE would make zero |
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difference where the package is already installed, so no version bump is |
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needed. |
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|
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All this depends on the judgement of the ebuild maintainer |
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|
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-- |
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Alan McKinnon |
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alan.mckinnon@×××××.com |