In Gentoo:

In the make.conf configuration file, is there a way to disable all USE
flags by default, for example by using a wildcard, then explicitly set the
ones that I want?

For example, all flags disabled, except the foo and bar flags:

USE="-* foo bar"

Is it possible to have more than one USE= line in the
/etc/make.conf file?

For example:

USE="foo"
USE="bar"

Currently my make.conf file has one long USE line which explicitly sets
or clears each of the known global flags.

Regards,

Mark.

--
Mark Hobley,
393 Quinton Road West,
Quinton, BIRMINGHAM.
B32 1QE.

Mark Hobley wrote:
> In Gentoo:
>
> In the make.conf configuration file, is there a way to disable all USE
> flags by default, for example by using a wildcard, then explicitly set the
> ones that I want?
>
> For example, all flags disabled, except the foo and bar flags:
>
> USE="-* foo bar"

As far as I know, no.


> Is it possible to have more than one USE= line in the
> /etc/make.conf file?
>
> For example:
>
> USE="foo"
> USE="bar"

Yes, you can have multiple, but not in the way you suggest, the method
would imply that the last USE line would be used and all the previous
ones would be "ignored". This is how it's done:

USE="line one \
line two \
line three"


--

//Aho

Mark Hobley <markhobley@hotpop.donottypethisbit.com> wrote:
>
> Is it possible to have more than one USE= line in the
> /etc/make.conf file?
>
> For example:
>
> USE="foo"
> USE="bar"

It's a shell script, so you can do:

USE="foo"
USE="$USE bar"

--
*Art

On Sunday 20 April 2008 22:48, J.O. Aho wrote:

>> For example, all flags disabled, except the foo and bar flags:
>>
>> USE="-* foo bar"
>
> As far as I know, no.

It's indeed possible, and it used to be a widely-used practice for some time
for some people. Doing that nowadays is more risky, since there have been
cases where stuff has broken due to that, see eg bug #183451.

On 04/20/08 16:08, Mark Hobley wrote:
> In Gentoo:
>
> In the make.conf configuration file, is there a way to disable all USE
> flags by default, for example by using a wildcard, then explicitly set the
> ones that I want?

Yes. USE=-* foo bar

>
> For example, all flags disabled, except the foo and bar flags:
>
> USE="-* foo bar"
>
> Is it possible to have more than one USE= line in the
> /etc/make.conf file?
>
> For example:
>
> USE="foo"
> USE="bar"

Never tried it since continuing the USE statement across lines is
already easy.

USE="-*
foo
bar"

USE=-* \
foo \
bar

>
> Currently my make.conf file has one long USE line which explicitly sets
> or clears each of the known global flags.
>
> Regards,
>
> Mark.

Doug