[gentoo-embedded] Cross Dev Tricks + Hardened questions

[Shinkan]

Hi there,

I'm quite sorry to annoy you, but I'm quite new to Gentoo, and the Embedded
Handbook (which appears to be the best information source for what I want to
do) does not make it clear for me.
I hope you'll be able to help me a little.

I have a base host system, which is a x86 hardened-profiled Gentoo 10.0.
I would like to use it to build target systems with the most control Gentoo
can offer.
I first looked at Catalyst but Cross-dev things seemed more accurate for
what I want to do.

Let's say I want to make a "example-v1" target system.
I want my host to build on a "example-v1-build" directory everything needed
to build and emerge binaries for my target system.
I want my host to build with "example-v1-build" files and toolchain a
"example-v1-target" directory which would contain emerged system.
"example-v1-target" would contain a very minimal system, with no gcc, emerge
or dev things. It just have to be able to run C/C++ binaries for a given
arch.

I would like to use crossdev because I want to specify which version of
glibc/gcc/etc I will use for one given target.
Furthermore, I would like my toolchain to build "hardened" binaries, as
those we get by using an hardened stage3.

I don't get the process from the Embedded Handbook.
Do I have to set some CHOST, CTARGET, ROOT or PORTAGE_CONFDIR env vars or
crossdev will handle that some way ?
How can I tell to crossdev : "build the cross toolchain to my
example-v1-build directory" ?
How can I then tell to emerge "emerge and build from my example-v1-build
directory to example-v1-target" ? Do I have to chroot in "example-v1-build"
? In this case wouldn't I lost all emerge capabilities ?

Many thanks in advance for your help.
Sorry I can't figure it all by myself despite the good docs.

-- 
Pierre.
"Sometimes when I'm talking, my words can't keep up with my thoughts. I
wonder why we think faster than we speak. Probably so we can think twice." -
Bill Watterson