On Sun, Jun 12, 2016 at 04:12:21PM +0200, Andreas Enge wrote: > On Fri, Jun 10, 2016 at 12:30:45PM -0400, Leo Famulari wrote: > > On Fri, Jun 10, 2016 at 03:10:13PM +0300, Efraim Flashner wrote: > > > +(define-public qtimageformats > > > + (package (inherit qtsvg) > > These patches make me realize my understanding of package inheritance is > > unclear. > > > > If qtsvg is updated, but no other changes are made, will qtimageformats > > (and all the other packages that inherit from qtsvg) need to be rebuilt > > as well? > > > > Looking at `guix refresh -l` and `guix gc --references` suggests the > > answer is "no". > > My understanding is that not the package definition, but the derivation > counts. So for instance, if the version is increased in qtsvg, this new > version also appears in qtimageformats, but if it is set back there, not > even the package definition has changed. > > So this should be safe; in a sense, the inheritance from qtsvg creates a > "qt build system"; since this is so far only used internally to build qt > itself, I think it is okay to not expose it to the exterior world. > > However, another question: Are all the inputs for qtbase needed for all the > other modules, too, or could the list be trimmed? > > Andreas >
quite possibly the inputs could be shortened, but since they're all using qmake for configure I don't really know how to check. The best I have for cross-distro comparison is debian: $ apt-cache depends libqt5svg5 libqt5svg5 PreDepends: dpkg dpkg:i386 Depends: libc6 Depends: libqt5core5a Depends: libqt5gui5 Depends: libqt5widgets5 Depends: libstdc++6 Depends: <qtbase-abi-5-5-1> Depends: zlib1g I don't think I've seen anything like <qtbase-abi-5-5-1> before, but I'm assuming its the list of inputs/depends that qtbase-5.5.1 uses in Debian. qtcore, qtgui and qtwidgets are all outputs of qtbase. -- Efraim Flashner <efr...@flashner.co.il> אפרים פלשנר GPG key = A28B F40C 3E55 1372 662D 14F7 41AA E7DC CA3D 8351 Confidentiality cannot be guaranteed on emails sent or received unencrypted
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