On 10/28/2013 12:05 PM, Doug Goldstein wrote:
With Mac OS X 10.9, xdrproc_t is no longer defined as:
typedef bool_t (*xdrproc_t) (XDR *, void *, ...);
but instead as
typedef bool-t (*xdrproc_t) (XDR *, void *, unsigned int);
The rationale explained in the header is that using a vararg is incorrect and has a potential to change the ABI slightly. They decided to specify the exact number of parameters and for compatibility with old code decided to make the signature require 3 arguments. The third argument is ignored for cases that its not used and its recommended to supply a 0. --- configure.ac | 41 +++++++++++++++++++++++++++++++++++++++++ src/rpc/virnetmessage.c | 10 ++++++++-- 2 files changed, 49 insertions(+), 2 deletions(-)
I'd like some feedback from someone else who can actually test this on MacOS, as well as FreeBSD, but it does seem reasonable to get in 1.1.4.
diff --git a/configure.ac b/configure.ac index 1c5b168..f2bae88 100644 --- a/configure.ac +++ b/configure.ac @@ -697,6 +697,47 @@ if test x"$with_remote" = x"yes" || test x"$with_libvirtd" = x"yes"; then *) XDR_CFLAGS=$lv_cv_xdr_cflags ;; esac AC_SUBST([XDR_CFLAGS])
Not your fault, but we probably ought to move xdr stuff into m4/virt-xdr.m4 - but that can wait till post-release.
+ AC_DEFINE_UNQUOTED([XDRPROC_T_ARG_COUNT], [$lv_cv_xdrproc_t_args], + [number of arguments that xdrproc_t func ptr takes])
Seems reasonable; but I'm a bit worried about accepting args=2 in the cases where we actually needed the varargs to pass 3. It may be safer to pass 3 always, unless we have empirical evidence that uclibc will fail to compile if we don't limit to exactly 2 (and not just a thread archives where they were contemplating forcing just 2, but where I don't know if the thread was actually applied as a patch).
+#if XDRPROC_T_ARG_COUNT == 3 +# define VIR_XDRPROC(proc, xdr, data) ((proc)((xdr), (data), 0)) +#else +# define VIR_XDRPROC(proc, xdr, data) ((proc)((xdr), (data))) +#endif
This seems like a nice abstraction for the problem at hand. Here's hoping we get someone to provide test results in a timely manner. -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org