[libvirt] Problems using libvirt (linking errors)

[Johannes Formann]

Atsushi SAKAI <sakaia at jp.fujitsu.com> wrote:

Hi,

>   I guess You are missing linking libvirt.

What do you mean, would it be autmoticaly linked like other librarys in
/usr/lib? (sorry, I'm not a c/c++ expert)

> If not, Please check libvirt library by using nm command.

# nm /usr/lib/libvirt.so.0.4.4 
nm: /usr/lib/libvirt.so.0.4.4: no symbols

# nm -D /usr/lib/libvirt.so.0.4.4 
<lost of output like..>
cxa_finalize
         U __errno_location
         U __fprintf_chk
         U __fxstat64
         w __gmon_start__
         U __isnan
         U __memmove_chk
         U __printf_chk
         U __snprintf_chk
         U __sprintf_chk
         U __strcat_chk
         U __strcpy_chk
         U __strdup
         U __strncat_chk
         U __strncpy_chk
         U __strndup
         U __strtod_internal
         U __strtol_internal
         U __strtoll_internal
         U __strtoul_internal
         U __strtoull_internal
00010820 T __virAlloc
000107e0 T __virAllocN
00017bc0 T __virBufferAdd
00017880 T __virBufferAddChar
00017c60 T __virBufferContentAndReset
00017550 T __virBufferError
00017ac0 T __virBufferVSprintf
00033890 T __virConfFree
00033b00 T __virConfGetValue
00033c40 T __virConfNew
00034b50 T __virConfReadFile
00034ad0 T __virConfReadMem

including 
0000f570 T virConnectOpen
0000f300 T virInitialize

So the libary itself should be ok, and I have only some stupid errors in
the makefile?

regards Johannes

> Thanks
> Atsushi SAKAI
> 
> 
> johannes at formann.de (Johannes Formann) wrote:
> 
> > Hello,
> > 
> > I habe a problem using a recent libvirt-Version (0.4.4) (installed from
> > backports.org) in my own programms.
> > I had used an older Version a while ago, but I think something might
> > have changed in the API(?), since the old code has the same problems
> > now.
> > 
> > I include the headers
> > #include <libvirt/libvirt.h>
> > #include <libvirt/virterror.h>
> > 
> > but when linking, I'll get errors like
> > XSSserver.o: In function `XSSserver::XSSserverinitializeService(void*)':
> > /root/rsplib-2.5.0/rsplib/XSSserver.cc:68: undefined reference to
> > `virInitialize'
> > /root/rsplib-2.5.0/rsplib/XSSserver.cc:72: undefined reference to
> > `virConnectOpen'
> > 
> > 
> > here is the function:
> > bool XSSserver::XSSserverinitializeService(void* userData)
> > {
> >     if ( virInitialize() != 0) {
> >         puts("WARNING: vir Initializew failed\n") ;
> >         return false;
> >     }
> >     virCon=virConnectOpen(NULL);
> >     if (virCon != NULL ) {
> >         return true;
> >     }
> >     puts("WARNING: Initialisierung misslungen") ;
> >     return false;
> > }
> > 
> > Any hints what I've done wrong/how to debug that problem?
> > 
> > regards  Johannes
> > 
> > --
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