[gentoo-user] Switching off a long list of USE flags

[gentoo-user] Switching off a long list of USE flags

[gevisz]

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I would like to build sane-backend only for one specific scanner.

However, there are a huge lot of different USE flags for other scanners
that are already switched on by default.

Is there any easy way to switch them off?

Something like:

          media-gfx/sane-backends -sane_backends* sane_backends_hp

Exactly that way does not work, but may be something like that...

...instead of directly switching off every one of them.

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Re: [gentoo-user] Switching off a long list of USE flags

[Yohan Pereira]

On 19/09/13 at 05:14pm, gevisz wrote:
> I would like to build sane-backend only for one specific scanner.
> 
> However, there are a huge lot of different USE flags for other scanners
> that are already switched on by default.
> 
> Is there any easy way to switch them off?
> 
> Something like:
> 
>           media-gfx/sane-backends -sane_backends* sane_backends_hp
> 
> Exactly that way does not work, but may be something like that...
> 
> ...instead of directly switching off every one of them.

you can try 

media-gfx/sane-backends -* sane_backends_hp <other flags you need>

-- 

- Yohan Pereira

The difference between a Miracle and a Fact is exactly the difference
between a mermaid and a seal.
                -- Mark Twain

Re: [gentoo-user] Switching off a long list of USE flags

[Frank Steinmetzger]

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On Thu, Sep 19, 2013 at 07:58:05PM +0530, Yohan Pereira wrote:

> > I would like to build sane-backend only for one specific scanner.
> > 
> > However, there are a huge lot of different USE flags for other scanners
> > that are already switched on by default.
> > 
> > Is there any easy way to switch them off?
> > […]
> > ...instead of directly switching off every one of them.
> 
> you can try 
> 
> media-gfx/sane-backends -* sane_backends_hp <other flags you need>

as eix tells you:

     SANE_BACKENDS="+abaton +agfafocus +apple ..."

It’s not just use flags, but an expanding variable. So if you put
SANE_BACKENDS="your device here" into make conf, only the specified
driver will be built. It’s the same principle that goes with VIDEO_CARDS
and LINGUAS, for example.
-- 
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The best secret of all: to be a genius and be the only one to know.

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Re: [gentoo-user] Switching off a long list of USE flags

[Wang Xuerui]

2013/9/19 gevisz <gevisz@gmail.com>:
> I would like to build sane-backend only for one specific scanner.
>
> However, there are a huge lot of different USE flags for other scanners
> that are already switched on by default.
>
> Is there any easy way to switch them off?
>
> Something like:
>
>           media-gfx/sane-backends -sane_backends* sane_backends_hp
>
> Exactly that way does not work, but may be something like that...
>
> ...instead of directly switching off every one of them.

According to the Package Manager Specification, the variable should
not be incremental, i.e. any value set would override *any* defaults
or previously set values. So just do SANE_BACKENDS="xxx" in your
make.conf, same as what you'd do for VIDEO_CARDS and the like.

Hope it helps :)

Re: [gentoo-user] Switching off a long list of USE flags

[gevisz]

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2013/9/19 Wang Xuerui <idontknw.wang@gmail.com>

> 2013/9/19 gevisz <gevisz@gmail.com>:
> > I would like to build sane-backend only for one specific scanner.
> >
> > However, there are a huge lot of different USE flags for other scanners
> > that are already switched on by default.
> >
> > Is there any easy way to switch them off?
> >
> > Something like:
> >
> >           media-gfx/sane-backends -sane_backends* sane_backends_hp
> >
> > Exactly that way does not work, but may be something like that...
> >
> > ...instead of directly switching off every one of them.
>
> According to the Package Manager Specification, the variable should
> not be incremental, i.e. any value set would override *any* defaults
> or previously set values. So just do SANE_BACKENDS="xxx" in your
> make.conf, same as what you'd do for VIDEO_CARDS and the like.
>
> Hope it helps :)
>

Yes,

SANE_BACKENDS="hp"

works,

SANE_BACKENDS="+hp3500"

does not.

Thank you for all who replied.

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Re: [gentoo-user] Switching off a long list of USE flags

[Neil Bothwick]

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On Thu, 19 Sep 2013 17:14:02 +0300, gevisz wrote:

> I would like to build sane-backend only for one specific scanner.
> 
> However, there are a huge lot of different USE flags for other scanners
> that are already switched on by default.
> 
> Is there any easy way to switch them off?

Yes, switch on the one you want. The only time all the backends are
enabled are when SANE_BACKENDS is not defined. Set that to the scanner
you have in make.conf and that is all you will get.


-- 
Neil Bothwick

NOTE: In order to control energy costs the light at the end
of the tunnel has been shut off until further notice...

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