Libguestfs - Oct 2015 - Re: Build libguestfs error with undefined reference to `guestfs_int_init_libvirt_backend'

Dear all,

I am trying to build libguestfs library on my system : Ubuntu Server 12.04
x64bit on XEN hypervisor.

I have followed all instructions on their homepage but whey i am trying to
build the library make -> gives me the following error: libguestfs.so:
undefined reference to `guestfs_int_init_libvirt_backend'

Here is a sample code of the error :

make[2]: Entering directory `/home/str/libguestfs-1.30.3/examples'
  CCLD     create-disk
../src/.libs/libguestfs.so: undefined reference to
`guestfs_int_init_libvirt_backend'
collect2: ld returned 1 exit status
make[2]: *** [create-disk] Error 1
make[2]: Leaving directory `/home/str/libguestfs-1.30.3/examples'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/home/str/libguestfs-1.30.3'
make: *** [all] Error 2

I have already installed all the dependencies for the library [sudo apt-get
build-dep libguestfs] and updated my automake version to 1.13[latest for
ubuntu 12.04] as i have read on another redhat list post [this one :
https://www.redhat.com/archives/libguestfs/2014-January/msg00015.html ] but
still nothing.. I must be missing something !

I haven't done anything rather than ./configure && make

Any tips/help would be appreciated.

Stratos

On Thu, Oct 15, 2015 at 11:57:49PM +0300, Efstratios Skleparis
wrote:
> Dear all,
> 
> I am trying to build libguestfs library on my system : Ubuntu Server 12.04
> x64bit on XEN hypervisor.
> 
> I have followed all instructions on their homepage but whey i am trying to
> build the library make -> gives me the following error: libguestfs.so:
> undefined reference to `guestfs_int_init_libvirt_backend'
> 
> Here is a sample code of the error :
> 
> make[2]: Entering directory `/home/str/libguestfs-1.30.3/examples'
>   CCLD     create-disk
> ../src/.libs/libguestfs.so: undefined reference to
> `guestfs_int_init_libvirt_backend'
> collect2: ld returned 1 exit status
> make[2]: *** [create-disk] Error 1
> make[2]: Leaving directory `/home/str/libguestfs-1.30.3/examples'
> make[1]: *** [all-recursive] Error 1
> make[1]: Leaving directory `/home/str/libguestfs-1.30.3'
> make: *** [all] Error 2
> 
> I have already installed all the dependencies for the library [sudo apt-get
> build-dep libguestfs] and updated my automake version to 1.13[latest for
> ubuntu 12.04] as i have read on another redhat list post [this one :
> https://www.redhat.com/archives/libguestfs/2014-January/msg00015.html ] but
> still nothing.. I must be missing something !
> 
> I haven't done anything rather than ./configure && make
Yup, this is actually a bug in the library.

I'm guessing you have libvirt-dev installed, but it is some ancient
version (less than 0.10.2 specifically).  This means libvirt is
compiled out of the library here:

https://github.com/libguestfs/libguestfs/blob/677c721e85380fc54ae6d0bebe885101360a6028/src/launch-libvirt.c#L64-L80

but still referenced here:

https://github.com/libguestfs/libguestfs/blob/677c721e85380fc54ae6d0bebe885101360a6028/src/launch.c#L518-L520

You can just comment out lines 518-520 in the latter file to make it work.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
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The attached patch may be a full fix.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
virt-p2v converts physical machines to virtual machines.  Boot with a
live CD or over the network (PXE) and turn machines into KVM guests.
http://libguestfs.org/virt-v2v

[Please keep all replies on the list.]

On Fri, Oct 16, 2015 at 03:01:42AM +0300, Efstratios Skleparis
wrote:
> Dear Richard,
> 
> Yes I do have libvirt-dev installed already and virsh --version was : 0.9.8
> !
> 
> - I tried to comment out the lines but still i got some errors due to that
> [ undeclared variables etc. ]
> 
> - Made changes to files :
> 
>   src/guestfs-internal.h
> 
>  src/launch-libvirt.c
> 
>   src/launch.c
> 
> As you mentioned on the patch but still had errors on building the
> library..
> 
> Didn't save the error output because the solution was just to update
> libvirt , 0.9.8 version to a latter one has that bug as it seemed..
> 
> I chose to update from 0.9.8 to 1.2.20 from tarball and finally I could
> build the library -> ./configure && make worked like charm [took
like 6-8
> mins though : P] !!
> 
> Thanks again for your time and your fast response !


-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
virt-df lists disk usage of guests without needing to install any
software inside the virtual machine.  Supports Linux and Windows.
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