Add CMake flag to log C API invocations, to aid debugging (#5925)

* Add CMake flag to log C API invocations, to aid debugging

* Remove unnecessary parentheses

jvm-packages/create_jni.py

@@ -21,7 +21,8 @@ CONFIG = {
 
     "USE_CUDA": "OFF",
     "USE_NCCL": "OFF",
-    "JVM_BINDINGS": "ON"
+    "JVM_BINDINGS": "ON",
+    "LOG_CAPI_INVOCATION": "OFF"
 }
 
 
@@ -70,6 +71,7 @@ def normpath(path):
 
 if __name__ == "__main__":
     parser = argparse.ArgumentParser()
+    parser.add_argument('--log-capi-invocation', type=str, choices=['ON', 'OFF'], default='OFF')
     parser.add_argument('--use-cuda', type=str, choices=['ON', 'OFF'], default='OFF')
     cli_args = parser.parse_args()
 
@@ -93,6 +95,9 @@ if __name__ == "__main__":
             else:
                 maybe_parallel_build = ""
 
+            if cli_args.log_capi_invocation == 'ON':
+                CONFIG['LOG_CAPI_INVOCATION'] = 'ON'
+
             if cli_args.use_cuda == 'ON':
                 CONFIG['USE_CUDA'] = 'ON'
                 CONFIG['USE_NCCL'] = 'ON'

jvm-packages/pom.xml

@@ -38,6 +38,7 @@
         <scala.version>2.12.8</scala.version>
         <scala.binary.version>2.12</scala.binary.version>
         <hadoop.version>2.7.3</hadoop.version>
+        <log.capi.invocation>OFF</log.capi.invocation>
         <use.cuda>OFF</use.cuda>
     </properties>
     <repositories>

jvm-packages/xgboost4j/pom.xml

@@ -84,6 +84,8 @@
                           <executable>python</executable>
                           <arguments>
                             <argument>create_jni.py</argument>
+                            <argument>--log-capi-invocation</argument>
+                            <argument>${log.capi.invocation}</argument>
                             <argument>--use-cuda</argument>
                             <argument>${use.cuda}</argument>
                           </arguments>