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Systemtap 1.2 <sys/sdt.h> tried to expand STAP_PROBE3 into an initialization: volatile __typeof__(arg) foo = arg; but that fails if arg was declared as 'char arg[100]'. Rather than make all callers to PROBE deal with the stupidity of <sys/sdt.h>, we instead make PROBE cast away the problem. Some of this preprocessor abuse copies ideas in src/libvirt.c. * daemon/libvirtd.h (PROBE): Add casts to all arguments, using... (VIR_ADD_CASTS, VIR_ADD_CAST, VIR_ADD_CAST2, VIR_ADD_CAST3) (VIR_ADD_CAST_EXPAND, VIR_ADD_CAST_PASTE, VIR_COUNT_ARGS) (VIR_ARG5, PROBE_EXPAND): New macros. Reported by Wen Congyang.
LibVirt : simple API for virtualization
Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.
Daniel Veillard <veillard@redhat.com>