Reinstall requires new USE flags?

Message

ManDay · Post by **ManDay** » Wed Oct 05, 2011 11:33 am

emerge -pv mesa

Calculating dependencies... done!
[ebuild   R    ] dev-libs/libxml2-2.7.8-r1  USE="ipv6 python* readline -debug -doc -examples -icu -test" 0 kB
[ebuild   R    ] media-libs/mesa-7.11  USE="classic egl gallium llvm nptl shared-glapi -bindist -debug -gbm -gles -motif -openvg -pax_kernel -pic (-selinux) -shared-dricore" VIDEO_CARDS="intel radeon -mach64 -mga -nouveau -r128 -savage -sis -tdfx -via -vmware" 0 kB

Total: 2 packages (2 reinstalls), Size of downloads: 0 kB

The following USE changes are necessary to proceed:
#required by media-libs/mesa-7.11, required by mesa (argument)
=dev-libs/libxml2-2.7.8-r1 python

Can someone explain what is going on here?

mark_alec · Post by **mark_alec** » Wed Oct 05, 2011 12:23 pm

mesa requires libxml2 to be built with python support. So add "dev-libs/libxml2 python" to your package.use file and it should all be fine.

Post by **John R. Graham** » Wed Oct 05, 2011 12:30 pm

Sometimes, when a change is introduced, the ebuild version is not bumped if existing functionality is not broken. Looks like some diabolically clever developer exposed some additional configurability within libxml2 that used to default on and that mesa needs to be on. Not a big deal.

- John

ManDay · Post by **ManDay** » Wed Oct 05, 2011 7:47 pm

John R. Graham wrote:Sometimes, when a change is introduced, the ebuild version is not bumped if existing functionality is not broken. Looks like some diabolically clever developer exposed some additional configurability within libxml2 that used to default on and that mesa needs to be on. Not a big deal.

- John

That means the two packages changed ebuilds synchronously without actually updating the version:

libxml added a USE flag and mesa specified it as required

Hence this doesn't show up when I run -uDN.

Such things should not be done, right?!

Jaglover · Post by **Jaglover** » Wed Oct 05, 2011 9:32 pm

This is not the first time and won't be the last one. Inevitable part of developing software (and dependencies between packages).

Genone · Post by **Genone** » Wed Oct 05, 2011 9:45 pm

mesa-7.11 always had the libxml[python] build time dependency. Question is why libxml got installed without python.

omidxo · Post by **omidxo** » Thu Oct 06, 2011 12:38 am

perl & python have been taken out from make.default, many packages should be rebuild, add them into make.conf with me.

baaann · Post by **baaann** » Thu Oct 06, 2011 11:27 am

omidxo wrote:perl & python have been taken out from make.default, many packages should be rebuild, add them into make.conf with me.

Is there any documentation for this change? If the USE flags are genuinely not required by the system there is no point in putting them in make.conf

Post by **John R. Graham** » Thu Oct 06, 2011 12:24 pm

Change logs, probably.

- John

Trog Dog · Post by **Trog Dog** » Thu Oct 06, 2011 12:48 pm

hope its not a rerun of the fortran use flag, removed one day and then added back the next.

omidxo · Post by **omidxo** » Thu Oct 06, 2011 1:01 pm

baaann wrote:
omidxo wrote:perl & python have been taken out from make.default, many packages should be rebuild, add them into make.conf with me.
Is there any documentation for this change? If the USE flags are genuinely not required by the system there is no point in putting them in make.conf

'by me', not 'with me'. Sorry for my Marslish.

Developer's blog here:
http://blog.jolexa.net/2011/10/05/gento ... t-profile/

Trog Dog · Post by **Trog Dog** » Thu Oct 06, 2011 1:07 pm

omidxo wrote:Developer's blog here:
http://blog.jolexa.net/2011/10/05/gento ... t-profile/

Thanks for the link

baaann · Post by **baaann** » Thu Oct 06, 2011 3:46 pm

Trog Dog wrote:
omidxo wrote:Developer's blog here:
http://blog.jolexa.net/2011/10/05/gento ... t-profile/
Thanks for the link

+1