Re: installing a second gcc on the same machine

["Mark Ryden" <markryde gmail com>]

Hi,
Thanks all for your answers !
>If it doesn't you'll need to just resort
>to building and installing gcc yourself (which is not really that
>hard).

I am trying to install and build gcc myself, as this seems the best
option; I downloaded the
gcc src.rpm and ran:
rpm -ivh
and then
rpmbuild -bp --target=x86_64 gcc41.spec (there are many pathces in
this source rpm)

Now, under /usr/src/redhat/BUILD I have a folder named:
gcc-4.1.1-20061011

I navigated there; I should run ./configure, but is there a way I can
know what are the options
for the configure which the gcc on FC6 was compiled with ?  There are
really many options and
I am afraid that if I will miss one, the when trying to build my
module with the generated gcc, it will give
errors. (I have access to a machine on which FC6 with this gcc runs;
but is there a way I can know what
are the options gcc was compiled when this gcc rpm was build ? maybe
by some option to
rpmbuild --rebuild??)

regards,
Mark






On Wed, Jun 11, 2008 at 5:40 PM, James Olin Oden <james oden gmail com> wrote:
> 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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