Re: [gentoo-user] Gentoo speed comparison to other distros

[Mark David Dumlao <madumlao@gmail.com>]

On Fri, Mar 15, 2013 at 5:26 PM, Neil Bothwick <neil@digimed.co.uk> wrote:
> On Fri, 15 Mar 2013 13:47:49 +0800, Mark David Dumlao wrote:
>
>> > There's no need to rebuild everything, and those other flags make no
>> > sense when using -e. Generally you only need
>> >
>> > emerge -uaD --changed-use @world
>> >
>>
>> I know that, in general principle. But it's a test environment. I'd
>> assume stricter standards of "purity" there than elsewhere. simply
>> going by changed-use can break some library dependencies. We need to
>> use depclean to remove build deps junk after the emptytree, and we're
>> revdep-rebuilding twice in case the depclean borked something. (To be
>> really strict, revdep-rebuild should be repeated until it stops
>> building things...)
>
> portage should handle that itself nowadays, but it doesn't hurt to run
> revdep-rebuild to be sure. You could use -N instead of --changed-use but I
> still think -e is unnecessary.
>>
>> Heck in some setups empty-tree will simply fail thanks to circular
>> deps of the global use flags and you'll need manual intervention to
>> bootstrap a package with less USE...
>
> And that's a good reason to not use -e. If you do use -e, none of the
> other options make any sense, -u -D and -N are meaningless if the system
> thinks nothing is installed and there's no point in using -t without -a
> or -p, and with -e it would generate so much output I'm not sure many
> people would bother reading it all.

I'm pretty sure I just recycled the emptytree + deep/newuse advice
from one of the docs. I see it mentioned in the wiki at least.

http://en.gentoo-wiki.com/wiki/Freeing_Up_Disk_Space

Honestly, though, it's just a case of muscle memory at work. Usually I
just -uDNtv everything and just add options after that like -1, -a...