Re: installing a second gcc on the same machine

["James Olin Oden" <james oden gmail com>]

On Wed, Jun 11, 2008 at 10:15 AM, Mark Ryden <markryde gmail com> wrote:
> Hello,
>
>  I want to be able to build a kernel module of FC6 on an FC9 machine,
> I build the module on the FC9 machine against an FC6 kernel tree.
> However, when I insmod it, I get an error: it expects it to be built
> agains the gcc version of FC6.
>
> I want to keep the gcc of FC9.
>
> I tried to install the fc6 gcc rpm, with -force, but this seems to
> overwrite the previous version.
>
> My question is: is there a way to install two gcc rpms on the same machine?
>
You can use -i, --badreloc and --relocate (see rpm's man page).  With
the proper use of these you'll get the other gcc rpm installed off
in some other directory like /opt/gcc-fc6.  This may or may not work
well though depeding on how hard coded the search for various items
are within the gcc package.  If it doesn't you'll need to just resort
to building and installing gcc yourself (which is not really that
hard).

If it does work you've got some new problems though.  You can't
upgrade gcc now, as that will remove both gcc's.  This will mean that
you can either:

    upgrade one
    reinstall the other.

    install the new one
    remove the old one

That last one is an "rpm -i" followed by an "rpm -e", and probably can
be reversed.

Cheers...james
> (BTW: there is no compat version for gcc of FC6 in FC9)
>
> Regards,
> Mark
>
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