Fix domain events C example on Win32

printf on Win32 does not necessarily support %lld and we don't
have GNULIBs wrapper for printf(). Switch to use asprintf() for
which we do have a gnulib wrapper with %lld support

* examples/domain-events/events-c/event-test.c: Fix formatting
  of %lld on Win32
* cfg.mk: Don't require use of virAsprintf since this is an
  example app for out of tree users to follow

1 files changed, 10 insertions, 2 deletions

diff --git a/examples/domain-events/events-c/event-test.c b/examples/domain-events/events-c/event-test.c
index 7d05dd83d..1f46d42a2 100644
--- a/examples/domain-events/events-c/event-test.c
+++ b/examples/domain-events/events-c/event-test.c
@@ -169,8 +169,16 @@ static int myDomainEventRTCChangeCallback(virConnectPtr conn ATTRIBUTE_UNUSED,
                                           long long offset,
                                           void *opaque ATTRIBUTE_UNUSED)
 {
-    printf("%s EVENT: Domain %s(%d) rtc change %lld\n", __func__, virDomainGetName(dom),
-           virDomainGetID(dom), offset);
+    char *str = NULL;
+    /* HACK: use asprintf since we have gnulib's wrapper for %lld on Win32
+     * but don't have a printf() replacement with %lld */
+    if (asprintf(&str, "%s EVENT: Domain %s(%d) rtc change %lld\n",
+                 __func__, virDomainGetName(dom),
+                 virDomainGetID(dom), offset) < 0)
+        return 0;
+
+    printf("%s", str);
+    free(str);
 
     return 0;
 }