Allow tracepoint providers to be compiled with g++

[lttng-ust.git] / include / lttng / tracepoint-event.h

diff --git a/include/lttng/tracepoint-event.h b/include/lttng/tracepoint-event.h
index d36a9bafc3b470888b29f7e9010638f893f6f853..4630788c114625c7de68fdcbed122f69568bb63b 100644 (file)
--- a/include/lttng/tracepoint-event.h
+++ b/include/lttng/tracepoint-event.h
@@ -20,12 +20,12 @@
  * SOFTWARE.
  */
 
+#ifdef TRACEPOINT_CREATE_PROBES
+
 #ifdef __cplusplus
 extern "C" {
 #endif
 
-#ifdef TRACEPOINT_CREATE_PROBES
-
 #define __tp_stringify1(x)     #x
 #define __tp_stringify(x)      __tp_stringify1(x)
 
@@ -39,21 +39,36 @@ extern "C" {
        TRACEPOINT_EVENT_INSTANCE(_provider, _name, _name,              \
                        _TP_PARAMS(_args))
 
-#define TRACEPOINT_INCLUDE     __tp_stringify(TRACEPOINT_INCLUDE_FILE)
 
 #undef TRACEPOINT_CREATE_PROBES
 
 #define TRACEPOINT_HEADER_MULTI_READ
+
+/*
+ * LTTng-UST 2.0 expects TRACEPOINT_INCLUDE_FILE, but this approach has
+ * the unwanted side-effect of expanding any macro name found within
+ * TRACEPOINT_INCLUDE_FILE.
+ *
+ * Starting from LTTng-UST 2.1, we expect the TRACEPOINT_INCLUDE to be
+ * defined by probes as a string. We still check for
+ * TRACEPOINT_INCLUDE_FILE for API backward compatibility.
+ */
+#ifdef TRACEPOINT_INCLUDE_FILE
+#define TRACEPOINT_INCLUDE     __tp_stringify(TRACEPOINT_INCLUDE_FILE)
+#endif
+
 #include TRACEPOINT_INCLUDE
 
 #include <lttng/ust-tracepoint-event.h>
 
 #undef TRACEPOINT_HEADER_MULTI_READ
-
-#define TRACEPOINT_CREATE_PROBES
-
-#endif /* TRACEPOINT_CREATE_PROBES */
+#undef TRACEPOINT_INCLUDE_FILE
+#undef TRACEPOINT_INCLUDE
 
 #ifdef __cplusplus
 }
 #endif
+
+#define TRACEPOINT_CREATE_PROBES
+
+#endif /* TRACEPOINT_CREATE_PROBES */