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Re: [libvirt] [PATCH 1/2] set HAVE_LIBNL in config.h



On 06/23/2011 08:41 AM, Matthias Bolte wrote:
2011/6/23 Stefan Berger<stefanb linux vnet ibm com>:
Set HAVE_LIBNL to be able to conditionally compile libnl code.

Signed-off-by: Stefan Berger<stefanb linux vnet ibm com>

---
  configure.ac |    3 +++
  1 file changed, 3 insertions(+)

Index: libvirt-acl/configure.ac
===================================================================
--- libvirt-acl.orig/configure.ac
+++ libvirt-acl/configure.ac
@@ -2377,7 +2377,10 @@ if test "$with_macvtap" = "yes"; then
     ], [
         AC_MSG_ERROR([libnl-devel>= $LIBNL_REQUIRED is required for macvtap support])
     ])
+    have_libnl=yes
+    AC_DEFINE_UNQUOTED([HAVE_LIBNL], 1, [whether the netlink library is available])
  fi
+AM_CONDITIONAL([HAVE_LIBNL], [test "$have_libnl" = "yes"])

  AC_SUBST([LIBNL_CFLAGS])
  AC_SUBST([LIBNL_LIBS])


HAVE_LIBNL is just an alias for WITH_MACVTAP by this construct. So you
could just use WITH_MACVTAP in the code instead of HAVE_LIBNL. Or do
you plan to use libnl also for non-macvtap related code.

Initially I was using WITH_MACVTAP for the conditional compilation in the 2nd patch, but this seems wrong since code dependent on -lnl should have a corresponding HAVE_LIBNL. I did obviously not go as far as making the above check for libnl independent of macvtap. I'd probably get it wrong. So really what should be done is

check for libnl on a linux system and set HAVE_LIBNL if found
if 'with_macvtap' is yes, check whether previously libnl was found. I guess one could check the 'have_libnl' for that.

   Stefan



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