Fix: C++: incomplete extern C guard transition

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

diff --git a/include/lttng/tracepoint-event.h b/include/lttng/tracepoint-event.h
index e7bcea92ea58d1912b15a4927f8e5b6b22f103dc..c1ca31c85e11a64d0f5b0b5080e08282a06cec58 100644 (file)
--- a/include/lttng/tracepoint-event.h
+++ b/include/lttng/tracepoint-event.h
@@ -10,12 +10,16 @@
  *
  * The above copyright notice and this permission notice shall be included in
  * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
  */
 
-#ifdef __cplusplus
-extern "C" {
-#endif
-
 #ifdef TRACEPOINT_CREATE_PROBES
 
 #define __tp_stringify1(x)     #x
@@ -31,21 +35,32 @@ 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
+#undef TRACEPOINT_INCLUDE_FILE
+#undef TRACEPOINT_INCLUDE
 
 #define TRACEPOINT_CREATE_PROBES
 
 #endif /* TRACEPOINT_CREATE_PROBES */
-
-#ifdef __cplusplus
-}
-#endif