On Friday, 2 March 2018 11:34:09 GMT Peter Humphrey wrote:
> On Friday, 2 March 2018 11:12:36 GMT Helmut Jarausch wrote:
> > Hi,
> > 
> > I'd like to install a second Gentoo system on a partition by running
> > QEMU using that partition (directly) - this is to create and update a
> > Gentoo
> > system with different CFLAGS (for an older machine).

The QEMU guest's complete filesystem is contained within a *virtual* disk 
image.  As far as the host OS is concerned, the guest's disk with all 
partitions on it, is a file.  You can store this image file wherever you want 
and map the QEMU on the host to launch it.

> > Having no experience in such setups my initial problem is how to
> > install grub2 on that partition (only). I don't want to modify the MBR
> > of the whole drive containing that partition.

You do not install the guest's GRUB or any other boot loader on the host's 
partition.  You install it within the virtual disk after you have launched the 
guest having attached a LiveCD to it, using QEMU.

> I do the same for my Atom machine by NFS-exporting its /usr/portage to a
> chroot on my main machine. The question of booting doesn't arise; all that's
> needed is a copy of /etc/portage* and the world file. If that sounds
> interesting I can show you some more detail.
> * Things like -march and --jobs differ to suit the host machine, but that's
> about all.

As noted above you'll need to set up CFLAGS in the guest's make.conf file to 
suit the *guest* platform and its CPU.  Setting up "-march=native" won't work 


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