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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PFL - Portage file list - find which package a file or command belongs to.
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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?