Print probe provider mismatch error even without -Wsystem-headers

Suggested-by: David OShea <David.OShea@quantum.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

diff --git a/include/lttng/ust-tracepoint-event.h b/include/lttng/ust-tracepoint-event.h
index 8f804d62432eace7d5be6fe8811e017e9b524b3c..c341e043b0224a4607953be82bea90edd97125d0 100644 (file)
--- a/include/lttng/ust-tracepoint-event.h
+++ b/include/lttng/ust-tracepoint-event.h
@@ -72,7 +72,7 @@ void _TP_COMBINE_TOKENS(__tracepoint_provider_mismatch_, TRACEPOINT_PROVIDER)(vo
 #define TRACEPOINT_EVENT_INSTANCE(_provider, _template, _name, _args)  \
        __tracepoint_provider_mismatch_##_provider();
 
-static __attribute__((unused))
+static inline
 void _TP_COMBINE_TOKENS(__tracepoint_provider_check_, TRACEPOINT_PROVIDER)(void)
 {
 #include TRACEPOINT_INCLUDE
@@ -655,6 +655,15 @@ _TP_COMBINE_TOKENS(__lttng_events_init__, TRACEPOINT_PROVIDER)(void)
 {
        int ret;
 
+       /*
+        * __tracepoint_provider_check_ ## TRACEPOINT_PROVIDER() is a
+        * static inline function that ensures every probe PROVIDER
+        * argument match the provider within which they appear. It
+        * calls empty static inline functions, and therefore has no
+        * runtime effect. However, if it detects an error, a linker
+        * error will appear.
+        */
+       _TP_COMBINE_TOKENS(__tracepoint_provider_check_, TRACEPOINT_PROVIDER)();
        ret = lttng_probe_register(&_TP_COMBINE_TOKENS(__probe_desc___, TRACEPOINT_PROVIDER));
        assert(!ret);
 }