On Wed, 23 Jan 2013 17:01:11 -0600, Bruce Hill wrote:

> > > N = newuse (pkgs with changed USE flags)  
> > 
> > --changed-use makes more sense than -N, it saves unnecessary
> > compiling.  
> 
> If I understand "man emerge", --newuse tells me if an installed
> package has a USE flag that was added, removed, turned on, or turned
> off; whereas --changed-use only notifies me if a USE flag that I've
> chosen on my installed packages are changed -- not any other USE flags
> the maintainer, or some other committer, has changed (those have bitten
> me in the past).

That's right. So --changed-use only reemerges the package if the change
only affects your system, whereas -N will rebuild it even if the changed
flag is of no interest to you, such as when a flag you were not using is
removed. It saves recompiling packages for no reason, which is presumably
the reason it was added, it is a newer option than -N.


-- 
Neil Bothwick

This is the day for firm decisions! Or is it?