Re: cross compiling kvm

[Jerone Young <jyoung5-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>]

On Mon, 2007-11-26 at 11:57 +0100, Gerd Koenig wrote:
> hello,
> 
> can someone give me an information regarding the cross compile ability of kvm 
> (especially for qemu)? 
> Which is the first version of kvm, which is considered to be able to cross 
> compile?

It would be one of the newer versions. I started to sending cross
compile stuff probably around kvm-47 timeframe (I barely remember).
Definitely not kvm-28 though.

> 
> I tried KVM-28, which failed totally to cross-compile and I used KVM-53, which 
> already had better support to cross compile, but still is not perfect (makes 
> some assumptions about the host system, e.g. sdl-config).
> With some minor changes in the configure script for qemu I got kvm-53 cross 
> compiled. Unfortunatly kvm-53 doesn't run wit the preemption patches for 
> 2.6.21.6-rt21 but this is another question for later...
> 
> Of course, it can be possible, that I do something totally wrong.
> 
> This is my configure call:
> ./configure --arch=i386 --cross-prefix=/opt/crosstool/i686-pentium-linux-gnu/\
> gcc-3.4.3-glibc-2.3.3/bin/i686-pentium-linux-gnu- \
> --kerneldir=/home/gerdko/thinkiod_work/linux --disable-vnc-tls \
> --prefix=/home/gerdko/thinkiod_work/install
> 
> you might ask, why I use a cross compiler for x86? Well, I want to use kvm on 
> an embedded device, which doesn't have local gcc installed, so I need to 
> compile everything on another host.

I have found that your going to want to add "--with-patched-kernel" to
your command line also.

To solve your SDL issue you probably want to cross compile a version SDL
in a directory .. then add to the --qemu-cflags option &
--qemu-ldflags. Same whould go for stuff like ZLib.

./configure --arch=i386
--cross-prefix=/opt/crosstool/i686-pentium-linux-gnu/\
gcc-3.4.3-glibc-2.3.3/bin/i686-pentium-linux-gnu- \
--kerneldir=/home/gerdko/thinkiod_work/linux --disable-vnc-tls \
--prefix=/home/gerdko/thinkiod_work/install \
--with-patched-kernel \
--qemu-cflags="--static -I <SDL_DIR>/include -I <zlib_dir>/lib" \   
--qemu-ldflags="-L <SDL_DIR>/lib -L <zlib_dir>/include"

Another thing that you need to sneak in is that your going to need is
adding "--static" flag into the qemu compilation (which I do in
--qemu-cflags in the example).

Cross compiling qemu is a little bit of a pain.due to the external
dependencies. But it is possible.

Now just to add some more info to be over verbose. Way back we hacked
something together for powerpc and we had to manually compile cross
compile qemu doing the following:
	
        export LDFLAGS="-L/home/public/zlib-ppc/lib"
        export CFLAGS="-I/home/public/zlib-ppc/include"
       
       ./configure \
               --target-list=ppcemb-softmmu \
               --cpu=powerpc \
               --disable-gcc-check \
               --disable-sdl \
               --disable-gfx-check \
               --disable-kqemu \
               --cpu=powerpc \
               --cross-prefix=powerpc-440-linux-gnu- \
               --static
        
We didn't use SDL, but we did run into the same problem with zlib. Then
we just copied the executable over.

Hope that helps.

> 
> greetings,
> gerd
> 
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