add symbol versioning

Makefile.am

@@ -33,8 +33,14 @@ wdns/rrtype_to_str.c: wdns/wdns.h wdns/gen_rrtype_to_str
 wdns_libwdns_la_CPPFLAGS = \
 	-include $(top_builddir)/wdns/wdns-private.h
 wdns_libwdns_la_LDFLAGS = $(AM_LDFLAGS) \
-	-version-info $(LIBWDNS_CURRENT):$(LIBWDNS_REVISION):$(LIBWDNS_AGE) \
+	-version-info $(LIBWDNS_CURRENT):$(LIBWDNS_REVISION):$(LIBWDNS_AGE)
+if HAVE_LD_VERSION_SCRIPT
+wdns_libwdns_la_LDFLAGS += \
+	-Wl,--version-script=$(top_srcdir)/wdns/libwdns.sym
+else
+wdns_libwdns_la_LDFLAGS += \
 	-export-symbols-regex "^(wdns_[a-z].*)"
+endif
 wdns_libwdns_la_SOURCES = \
 	libmy/my_alloc.h \
 	libmy/vector.h \

configure.ac

@@ -47,6 +47,8 @@ AC_CHECK_LIB([pcap], [pcap_loop],
 )
 AM_CONDITIONAL([LIBPCAP], [test "$have_libpcap" = "true"])
 
+gl_LD_VERSION_SCRIPT
+
 AC_OUTPUT
 AC_MSG_RESULT([
     $PACKAGE $VERSION

m4/ld-version-script.m4

@@ -0,0 +1 @@
+../libmy/m4/ld-version-script.m4

wdns/libwdns.sym

@@ -0,0 +1,43 @@
+LIBWDNS_0.6.0 {
+global:
+        wdns_clear_message;
+        wdns_clear_rr;
+        wdns_clear_rrset;
+        wdns_clear_rrset_array;
+        wdns_compare_rr_rrset;
+        wdns_copy_uname;
+        wdns_count_labels;
+        wdns_deserialize_rrset;
+        wdns_domain_to_str;
+        wdns_downcase_name;
+        wdns_downcase_rdata;
+        wdns_downcase_rrset;
+        wdns_file_load_names;
+        wdns_is_subdomain;
+        wdns_left_chop;
+        wdns_len_uname;
+        wdns_message_to_str;
+        wdns_opcode_to_str;
+        wdns_parse_message;
+        wdns_print_message;
+        wdns_print_rr;
+        wdns_print_rrset;
+        wdns_print_rrset_array;
+        wdns_rcode_to_str;
+        wdns_rdata_to_str;
+        wdns_res_to_str;
+        wdns_reverse_name;
+        wdns_rr_to_str;
+        wdns_rrclass_to_str;
+        wdns_rrset_array_to_str;
+        wdns_rrset_to_str;
+        wdns_rrtype_to_str;
+        wdns_serialize_rrset;
+        wdns_skip_name;
+        wdns_sort_rrset;
+        wdns_str_to_name;
+        wdns_str_to_rrtype;
+        wdns_unpack_name;
+local:
+        *;
+};