Fix partial tracing debug builds
diff --git a/src/hb-debug.hh b/src/hb-debug.hh
index 213e543..6c425f7 100644
--- a/src/hb-debug.hh
+++ b/src/hb-debug.hh
@@ -220,8 +220,8 @@
{}
template <int max_level, typename ret_t>
-struct hb_auto_trace_t {
-
+struct hb_auto_trace_t
+{
explicit inline hb_auto_trace_t (unsigned int *plevel_,
const char *what_,
const void *obj_,
@@ -269,7 +269,17 @@
bool returned;
};
template <typename ret_t> /* Make sure we don't use hb_auto_trace_t when not tracing. */
-struct hb_auto_trace_t<0, ret_t>;
+struct hb_auto_trace_t<0, ret_t>
+{
+ explicit inline hb_auto_trace_t (unsigned int *plevel_,
+ const char *what_,
+ const void *obj_,
+ const char *func,
+ const char *message,
+ ...) HB_PRINTF_FUNC(6, 7) {}
+
+ inline ret_t ret (ret_t v, unsigned int line HB_UNUSED = 0) { return v; }
+};
/* For disabled tracing; optimize out everything.
* https://github.com/harfbuzz/harfbuzz/pull/605 */
