[gentoo-portage-dev] IUSE_DEFAULTS-v0.1

[Alec Warner]

Soo apparently I wasn't subscribed...stupid address changes ;)

Patch ( which is actually v0.2 since 0.1 was a proof of concept.. ) for 
having USE flag defaults in ebuilds.  The variable IUSE_DEFAULTS was 
chosen for backwards compatability, although I'm sure we will get 
complaints about extra variables and tree bloat.  If you have a better 
variable name, by all means propose it ;)

the default USE_ORDER is:

useorder="env:pkg:conf:iuse_defaults:auto:defaults"

Placing the new defaults before conf:pkg:env but after auto:defaults 
allows the user to easily over-ride these flags in their make.conf or in 
package.use.  The thought was also to try:

useorder="env:pkg:iuse_defaults:conf:auto:defaults"

But I thought it would be confusing to users as the IUSE defaults would 
over-ride make.conf settings.  This would be a regression from previous 
behaviors, although still over-rideable in package.use

Please pay especially close attention to the ebuild.sh changes as I am 
not familiar with that portion of code and I probably missed a few things.

This patch should apply cleanly to 2.1_pre4 and to trunk.
In order for this to work, you will need to set USE_ORDER="" in 
make.conf, otherwise the USE_ORDER from make.globals is used, and that 
USE_ORDER does not contain iuse_defaults.

-Alec Warner