[vhostmd] [PATCH 2/7] Allow gcc to check calls to vu_log* printf-like functions.

Although using gcc-specific extensions may be suspect, we now also use them in libguestfs without any problems. Lots of non-gcc compilers understand __attribute__ because so much code is now compiled for gcc. Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones virt-p2v converts physical machines to virtual machines. Boot with a live CD or over the network (PXE) and turn machines into Xen guests. http://et.redhat.com/~rjones/virt-p2v