[gentoo-dev] iuse defaults example

[William Hubbs <williamh@gentoo.org>]

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On Mon, Jul 09, 2007 at 11:26:19PM +0100, Ciaran McCreesh wrote:
> As for IUSE defaults... There were objections against that feature on
> the grounds that it's unnecessary and increased maintenance. Do they
> really offer any benefit over package.use?


Would iuse defaults not be appropriate when a certain use flag is
recommended as the default for most users for a package??

Here is an example, I think, where an iuse default would make sense.
Espeak uses the portaudio library as a way to actually play sounds.
However, it can also be compiled without portaudio in order to just
generate wav files.

The way espeak is currently in the tree, it requires portaudio, and that
is the way I figure most people would want it to compile.

The issue though is that the way we have it right now it is not possible
to build espeak only to create wav files.  There would be 2 ways I can
see to do that.

1)  Use the portaudio use flag, and put it in IUSE as +portaudio so that
a user can turn it off if they desire, or
2) use a use flag something like "noportaudio", which would turn it off
if the user enables it, but I don't like that because of the reverse
logic -- If a flag is in use, it should enable support for something,
not disable it.

Is there another option that I'm missing, or is something like this a
good case for iuse defaults?

- -- 
William Hubbs
gentoo accessibility team lead
williamh@gentoo.org
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