ENH: Added quick means to turn on verbose output for debugging this test.

Tests/CustomCommand/CMakeLists.txt

@@ -327,6 +327,8 @@ CONFIGURE_FILE(${CMAKE_CURRENT_SOURCE_DIR}/check_command_line.c.in
                @ONLY IMMEDIATE)
 ADD_EXECUTABLE(check_command_line
   ${CMAKE_CURRENT_BINARY_DIR}/check_command_line.c)
+# SET_TARGET_PROPERTIES(check_command_line PROPERTIES
+#   COMPILE_FLAGS -DCHECK_COMMAND_LINE_VERBOSE)
 ADD_CUSTOM_COMMAND(
   OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/command_line_check
   COMMAND ${CMAKE_COMMAND} -DMARK_FILE=${CMAKE_CURRENT_BINARY_DIR}/check_mark.txt

Tests/CustomCommand/check_command_line.c.in

@@ -21,7 +21,9 @@ int main(int argc, const char* argv[])
       }
     else
       {
-      /*printf("[%s]\n", *a);*/
+#if defined(CHECK_COMMAND_LINE_VERBOSE)
+      printf("[%s]\n", *a);
+#endif
       }
     }
   if(*a || *e)