Re: [uml-user] how to build programs for running in UML

[Han <kee...@gm...>]

On Tue, Aug 6, 2013 at 7:51 PM, Michael Richardson <mc...@sa...> wrote:

>
> Han <kee...@gm...> wrote:
>     > I am trying to build and run some of my C programs in UML.  One way
> I tried is
>     > to build (i.e. compile) the program on the host,  then run it in
> UML.  The
>     > problem is that the UML rootfs I used lacks many of the /usr/lib/
> shared
>     > libraries, hence the program failed to run.
>
> Well, you have to install the things you need then.
>
>     > My question is:  what is the best practice to build and run C
> programs for UML?
>     >  Do people normally compile the program on the host and then run it
> in UML?
>     > Or  compile the program directly in UML and then run it?
>
> I make sure I have the same operating system and 32/64-bit-ness, and I use
> hostfs, and I use "make DESTDIR=/path/to/my/uml/instance install".
>

[Han] in my case, the host is using a different linux kernel and different
32/64-bit-ness.  And I can't change that.  And I also cannot mount the UML
rootfs (don't have permission) to add things from the host.

the linux machine I used to build the UML rootfs is different from the
linux host that I run the UML.


>
>     > If folks compile the C programs in UML directly,  where the "gcc"
> comes from?
>     >  Is it built part of the rootfs,  or some add-ons?  Any pointers for
> that?
>
> It's part of the rootfs, and you have a complete operating system there.
> You use yum or apt or yast2 to install whatever you need.
>

[Han]  I don't have the network connection from inside the UML yet. Need to
set up that first and try to install things.

thanks.


>
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