Re: [Xen-users] trouble with building latest xen code

[Aastha Mehta <aasthakm@xxxxxxxxx>]

On 20 February 2014 13:48, Ian Campbell <Ian.Campbell@xxxxxxxxxx> wrote:
> On Thu, 2014-02-20 at 13:42 +0100, Aastha Mehta wrote:
>> On 20 February 2014 13:28, Ian Campbell <Ian.Campbell@xxxxxxxxxx> wrote:
>> > On Thu, 2014-02-20 at 13:15 +0100, Aastha Mehta wrote:
>> >> On 20 February 2014 11:43, Ian Campbell <Ian.Campbell@xxxxxxxxxx> wrote:
>> >> > On Thu, 2014-02-20 at 11:40 +0100, Aastha Mehta wrote:
>> >> >> I just figured out the problem. While building the Xen code, I blindly
>> >> >> used all the dependencies listed on
>> >> >> http://wiki.xen.org/wiki/Compiling_Xen_From_Source and used apt-get to
>> >> >> install libyajl-dev. Looks like apt-cache has older version of the
>> >> >> library available. Even though I later installed the latest yajl from
>> >> >> the github, the default library being used was the older version. I
>> >> >> uninstalled the older version and then re-installed the latest and
>> >> >> everything works now.
>> >> >
>> >> > Which older version were you using and on which distro?
>> >> >
>> >> > If Xen doesn't build with the packages present in some major distro I
>> >> > think we want to know about it.
>> >> >
>> >> > Ian.
>> >> >
>> >> >
>> >>
>> >> Distro - Ubuntu 12.04.3 LTS (Precise),
>> >> Kernel - 3.13.2
>> >> Xen version - 4.4 unstable (custom build)
>> >> yajl older version: 1.0.12-2
>> >> # aptitude versions libyajl-dev
>> >> Package libyajl-dev:
>> >> pi  1.0.12-2                    precise                         500
>> >> Package libyajl-dev:i386:
>> >> p   1.0.12-2                    precise                         500
>> >>
>> >> Latest yajl version available: 2.0.1
>> >>
>> >> There is some change in the yajl code between version 1 and 2, which
>> >> prevents the tools, specifically libxl from compiling.
>> >
>> > Thanks.
>> >
>> > libxl is supposed to handle yajl1 as well as yajl2, detected at compile
>> > time. The only references to yajl_gen_config I can see are correctly
>> > within #ifdef HAVE_YAJL_V2 blocks and shouldn't be used when compiling
>> > against yajl1.
>> >
>> > Does Ubuntu's yajl 1.0.12 include /usr/include/yajl/yajl_version.h? This
>> > is used to detect which version, via the YAJL_MAJOR #define in it.
>> > http://packages.ubuntu.com/precise/amd64/libyajl-dev/filelist says it
>> > was there and it contained:
>> >         #define YAJL_MAJOR 1
>> >         #define YAJL_MINOR 0
>> >         #define YAJL_MICRO 12
>> >
>> > so I think libxl should have been using the yajl1 compatible code in
>> > libxl_json.h
>> >
>> > Did you by any chance have a mixture of packaged and unpackaged versions
>> > of libyajl installed when you saw this failure?
>> >
>> > Ian.
>> >
>>
>> That might have been the case actually. I do remember downloading and
>> installing all sorts of dependencies before building xen. The
>> yajl_version.h file was there, but because of a mixture of versions
>> installed things must have got messed up.
>
> Thanks.
>
> I'm going to assume this was some sort of local weirdness then and not
> worry about it any further.
>
> FWIW I believe all of Xen's dependencies are available packaged in
> Ubuntu so there shouldn't be any need to build any of them from source.
> This should be generally true of most major distros.
>
> Ian.
>

True, I will keep that in mind for the next time.

Thanks,
Aastha.

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