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

[wanne32]

Sorry for not answering so long.
But again: Yes of course deleting zzz and searching manually for a solution that solves the problem.
I know exactly where this discussion is going if I post this output: Suggestions how to add use flags to satisfy all dependencies.
As I said I already found one without conflicting USE-Flags.
I do not want a solution for that particular problem. I want a general way to find solutions that satisfy all dependencies depending on my USE-Flag preference.

[pjp]

[logrusx]

[Genone]

[logrusx]

[wanne32]

> There is no such thing as portage is not a mind-reading tool.
SAT-Solving is hard. Even NP hard. But not as hard as mind reading.
> To add to Genone's response, emerge does, but you don't know how to talk its language.
This is the reason why I am asking here.

Again this is a very very easy question: I give emerge a set of USE-flags for a few packages. I want a set of USE-flags back so that there are no conflicting USE-flag requirements. Preferably a set as small set as possible.

If it's so easy why can no one answer the question how to do it?! Instead of talking around about things that are totally irrelevant to that problem?


By default emerge already does something like that: It recognizes conflicts and proposes one solution to that problem. So most of the time you can just play outer loop and call emerge often enough an do what it suggests but neither is that satisfying to call emerge over and over again and copy and paste what it suggests nor will it always find a solution, since you have to do backtracking if you choose the wring of multiple solutions.

[NeddySeagoon]

wanne32,

It can't be done as portage cannot make choices for you.
As the system architect, that's your job.

Gentoo gives you the tools to configure and install your very own Linux distro.
It expects you to use them to express your choices/decisions.
Portage can give you hints, which can be wrong.
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Regards,

NeddySeagoon

Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail.

[logrusx]

[Genone]

[wanne32]

[NeddySeagoon]

wanne32,

Now you want portage to work like a chess engine.
'Guess' at a solution to the first problem and proceed on that basis ... and so on recursively.
How long do you want to wait for a solution that you don't like?

Dependency resolution is already over an hour on low end hardware, without any 'guesses'.

The problems arise for users setting per package USE flags without understanding that USE flags cannot be set on a per package basis in isolation.
Portages --autounmask feature should never be used without understanding the deeper effects of what it will do.
That means in most cases, don't use it. It can dig a bigger hole than you are already in.
_________________
Regards,

NeddySeagoon

Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail.

[wanne32]

[NeddySeagoon]

wanne32,

Low end hardware means an AMD E350 ... it takes over an hour to work out what to do.
Raspberry Pis can take a lot longer.
My AMD 5950X is a lot faster.

[pietinger]