How 2 keep slotted installs out of emerge -cp list?[Solved]

[CaptainBlood]

Hi dear all,
I've recently installed latest binutils (2.22-r1 I believe).
It so happened that at least 1 package doesn't install yet (nm-applet if I'm not wrong) with that new binutils package.
So I have to keep former stable binutils installed for a while still.

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emerge -cp

always propose to remove oldest package.

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--exclude

parameter is a good remedy, but has to be remembered each time and instanciated for each concerned package.

Is there any way to have

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emerge -c

command keeping many slotted packages without the use of

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--exclude

parameter?

Thanks for your attention.

[krinn]

depclean remove obsolete package, if you wish to teach your portage what is obsolete and what is not, your world file is there for that.

So your solve is just that, add the package-version to your world file and they won't be considered anymore as obsolete/removable.
This is generally seen by users strike by depclean removing their kernel (they emerge gentoo-sources but not gentoo-sources-2.3.0 and so depclean will think gentoo-sources-2.3.1 install mean gentoo-sources-2.3.0 is now ok to be remove)

[Etal]

You can do "emerge --noreplace foobar:1.2" where "1.2" is the slot number. That will add that slotted version of foobar to the world file, as krinn said.

[CaptainBlood]

Thanks to both of you. I'll give it a try.
I generally use

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--noreplace

after I realized I have done an excessive cleanup of my world file.
I"m happy I've learned another purpose to it.

Thanks for your attention, interest and support.

EDIT : Actually for binutils I had to

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emerge --noreplace sys-devel/binutils-2.21.1-r1

since I couldn't succeed with a :2.21 syntax as suggested.
new line in world file is as

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sys-devel/binutils:x86_64-pc-linux-gnu-2.21.1