Re: Compiling Xen from source

[David I <dav.sec.lists@xxxxxxxxx>]

Hello,

for information, I was able to compile xen from source on Debian 10, with the following configuration:

david@debian:~/xen/xen$ uname -a
Linux debian 5.7.0-2-amd64 #1 SMP Debian 5.7.10-1 (2020-07-26) x86_64 GNU/Linux
david@debian:~/xen/xen$ gcc --version
gcc (Debian 8.4.0-4) 8.4.0
Copyright © 2018 Free Software Foundation, Inc.
Ce logiciel est un logiciel libre; voir les sources pour les conditions de copie.  Il n'y a
AUCUNE GARANTIE, pas même pour la COMMERCIALISATION ni L'ADÉQUATION À UNE TÂCHE PARTICULIÈRE.

david@debian:~/xen/xen$ git branch
  master
  stable-4.11
* stable-4.13
  stable-4.14
  staging
david@debian:~/xen/xen$ 

with a simple: "./configure && make dist".

But I had to modify some config files following the thread here:

http://buildroot-busybox.2317881.n4.nabble.com/PATCH-1-2-xen-Disable-Werror-when-building-td145149.html

the first build failed with a message: "configure test passed without -werror but failed with -error".

I had to resolve this to edit these files:

xen/Config.mk:

+-HOSTCFLAGS  = -Wall -Werror -Wstrict-prototypes -O2 -fomit-frame-pointer

++HOSTCFLAGS  = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer

xen/xen/arch/x86/Rules.mk:

+-CFLAGS += '-D__OBJECT_LABEL__=$(subst /,$$,$(subst -,_,$(subst $(BASEDIR)/,,$(CURDIR))/$@))'

++CFLAGS += -U__OBJECT_LABEL__ '-D__OBJECT_LABEL__=$(subst /,$$,$(subst -,_,$(subst $(BASEDIR)/,,$(CURDIR))/$@))'

xen/Rules.mk:

+-CFLAGS += '-D__OBJECT_FILE__="$@"'

++CFLAGS += -U__OBJECT_FILE__ '-D__OBJECT_FILE__="$@"'

I haven't tested the binary yet.

Kind regards,

David

Le mer. 16 sept. 2020 à 22:59, Hans van Kranenburg <hans@xxxxxxxxxxx> a écrit :

On 9/16/20 6:12 PM, Olaf Hering wrote:
> On Wed, Sep 16, David I wrote:
>
>> So, how did the debian package was compiled ? is this the same source code with
>> different options ?
>
> Xen 4.11 is from 2018. Use also a compiler from that year.
> Using this years compiler will lead to errors...

In Debian, Buster with Xen 4.11 uses gcc 8.

The Xen 4.11 that is in Debian unstable now does not compile any more
with gcc 10. That's why we really need to get Xen 4.14 in there now to
un-stuck that (even with additional picked patches again already).

Hans