Anticipate older libldns with travis

configure

@@ -1829,6 +1829,63 @@ $as_echo "$ac_res" >&6; }
 
 } # ac_fn_c_check_decl
 
+# ac_fn_c_check_member LINENO AGGR MEMBER VAR INCLUDES
+# ----------------------------------------------------
+# Tries to find if the field MEMBER exists in type AGGR, after including
+# INCLUDES, setting cache variable VAR accordingly.
+ac_fn_c_check_member ()
+{
+  as_lineno=${as_lineno-"$1"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $2.$3" >&5
+$as_echo_n "checking for $2.$3... " >&6; }
+if eval \${$4+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+$5
+int
+main ()
+{
+static $2 ac_aggr;
+if (ac_aggr.$3)
+return 0;
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  eval "$4=yes"
+else
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+$5
+int
+main ()
+{
+static $2 ac_aggr;
+if (sizeof ac_aggr.$3)
+return 0;
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  eval "$4=yes"
+else
+  eval "$4=no"
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+fi
+eval ac_res=\$$4
+	       { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
+$as_echo "$ac_res" >&6; }
+  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
+
+} # ac_fn_c_check_member
+
 # ac_fn_c_check_type LINENO TYPE VAR INCLUDES
 # -------------------------------------------
 # Tests whether TYPE exists after having included INCLUDES, setting cache
@@ -11401,6 +11458,17 @@ else
 fi
 
 
+ac_fn_c_check_member "$LINENO" "struct ldns_struct_dnssec_zone" "hashed_names" "ac_cv_member_struct_ldns_struct_dnssec_zone_hashed_names" "#include <ldns.h>
+"
+if test "x$ac_cv_member_struct_ldns_struct_dnssec_zone_hashed_names" = xyes; then :
+
+cat >>confdefs.h <<_ACEOF
+#define LDNS_DNSSEC_ZONE_HASHED_NAMES 1
+_ACEOF
+
+fi
+
+
 if test $found_all_libs == 0
 then
     as_fn_error $? "One more dependencies is missing" "$LINENO" 5

configure.ac

@@ -220,6 +220,9 @@ AC_CHECK_LIB([ldns], [ldns_dname_new_frm_str], [], [found_all_libs=0])
 AC_MSG_NOTICE([Checking for dependency libidn])
 AC_CHECK_LIB([idn], [idna_to_ascii_8z], [], [found_all_libs=0])
 
+AC_CHECK_MEMBER([struct ldns_struct_dnssec_zone.hashed_names],
+[AC_DEFINE_UNQUOTED([LDNS_DNSSEC_ZONE_HASHED_NAMES], [1], [When defined ldns_dnssec_zone contained the hashed_names member.])], [], [[#include <ldns.h>]])
+
 if test $found_all_libs == 0
 then
     AC_MSG_ERROR([One more dependencies is missing])

src/config.h.in

@@ -102,6 +102,9 @@
 /* Define to 1 if you have the <uv.h> header file. */
 #undef HAVE_UV_H
 
+/* When defined ldns_dnssec_zone contained the hashed_names member. */
+#undef LDNS_DNSSEC_ZONE_HASHED_NAMES
+
 /* Define to the sub-directory in which libtool stores uninstalled libraries.
    */
 #undef LT_OBJDIR

src/dnssec.c

@@ -502,6 +502,7 @@ priv_getdns_ldns_dnssec_zone_add_rr(ldns_dnssec_zone *zone, ldns_rr *rr)
 		zone->names = ldns_rbtree_create(ldns_dname_compare_v);
 	(void)ldns_rbtree_insert(zone->names, new_node);
 
+#ifdef LDNS_DNSSEC_ZONE_HASHED_NAMES
 	if (!(new_node = LDNS_MALLOC(ldns_rbnode_t))) {
 		ldns_dnssec_name_free(new_name);
 		return LDNS_STATUS_MEM_ERR;
@@ -513,6 +514,7 @@ priv_getdns_ldns_dnssec_zone_add_rr(ldns_dnssec_zone *zone, ldns_rr *rr)
 		zone->hashed_names = ldns_rbtree_create(ldns_dname_compare_v);
 	}
 	(void)ldns_rbtree_insert(zone->hashed_names, new_node);
+#endif
 
 	return ldns_dnssec_zone_add_rr(zone, rr);
 }