USE dependencies

[wanne32]

Every time i update @wolrd I spent half a day manually playing SAT solver for USE-dependencies on USE-Flags creating an larger and larger /etc/portage/package.use/zzz file preventing me using more and more binary packages.
Especially since emerge dosn't understand the difference between USE-Flags I put there because I need it and USE-Flags that are mere dependencies and should be removed with depclean when they are no longer needed.
I don't care if dev-qt/qtbase is build with gles2-only or -gles2-only. But emerge suggesting putting an infinit amount of lines that contradict the one before is less than helpful.
Is there any proper dependency solver or at least a proper machine readable output for all dependencies so that i can write my own one?

[Banana]

This sounds to me you are doing indivdual settings, which lead into doing more individual stuff.

So maybe you can provide an example with output which tells us what are your problems/wishes
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[wanne32]

I think the problem is not to complicated to understand. And of course the problem is now solved again manually and I am not that eager recompiling hundreds of packages to reproduce it.
There are a few different packages. A few require (over 5 edges) dev-qt/qtbase with gles2-only the others without.
I the end the solution was to compile media-video/pipewire and media-video/ffmpeg without v4l since I do not need that. But of course
emerge --update --deep --with-bdeps=y --ask @world
was never suggesting that instead first suggesting to add
>=dev-qt/qtbase-5.15.16 gles2-only to
/etc/portage/package.use/zzz
When I add that it will suggest to add
>=dev-qt/qtbase-5.15.16 -gles2-only
/etc/portage/package.use/zzz
and so on
What question do you have?

[nicop]

Although I wonder why I am responding to this thread, here is what others could read :

Some packages from dev-qt have "hard-links" for useflags (eg. opengl,gles2-only) and sometimes backtrack fails :
dev-qt/multimedia have dev-qt/qtgui:6[gles2-only=,png=,X?]
dev-qt/qtopengl have dev-qt/qtgui:6[gles2-only=] and dev-qt/qtwidgets:6[gles2-only=]
and so on for dev-qt/qtbase

My personal (and possibly ugly) solution is to apply useflags to the entire category :
dev-qt/* -gles2-only

For your example, media-libs/libv4l have this dep with qt6 enabled : dev-qt/qtbase:6[gui,opengl,widgets,-gles2-only]

[logrusx]

I suggest moving zzz out of package.use/accept_keywords and starting over. Post problematic output, point out what's problematic and we will take over from there.

Your explanation is very unclear, but it sounds like you are getting repeated contradicting outputs from emerge for one and the same package, one time enable this, one time disable this. That suggests you may have something you should not have in world or package.mask/accept_keywords/use.

You don't need to recompile hundreds of packages to diagnose this issue, just replace --ask with --pretend and post wgetpastes.

I understand your frustration but if you don't want to do that to diagnose your issue, posts like that are completely unnecessary.

Best Regards,
Georgi