Errors during messages compilation in ROS2

ros2

asked 2019-08-10 13:15:50 -0500

115 ●63 ●68 ●77

updated 2019-08-11 04:54:30 -0500

I get these errors and warning:

/home/le/master/build/rtabmap_ros/rosidl_generator_py/rtabmap_ros/msg/_info_s.c:686:23: warning: implicit declaration of function ‘PyLong_AsSize_t’; did you mean ‘PyLong_AsSsize_t’? [-Wimplicit-function-declaration]
     size_t itemsize = PyLong_AsSize_t(itemsize_attr);
                       ^~~~~~~~~~~~~~~
                       PyLong_AsSsize_t
/home/le/master/build/rtabmap_ros/rosidl_generator_py/rtabmap_ros/_rtabmap_ros_s.ep.rosidl_typesupport_c.c:9:15: error: variable ‘rtabmap_ros__module’ has initializer but incomplete type
 static struct PyModuleDef rtabmap_ros__module = {
               ^~~~~~~~~~~

Even though my messages are quite normal:

#std_msgs/Header header

# Set either node_id or node_label
int32 node_id
string node_label

# optional: if not set, the base frame of the robot is used
string frame_id

What could be the reason?

Part of my CMakeLists:

find_package(ament_cmake REQUIRED)
find_package(rclcpp)
find_package(cv_bridge)
find_package(sensor_msgs)
find_package(builtin_interfaces REQUIRED)
find_package(rosidl_default_generators REQUIRED)

set(msg_files
    "msg/Info.msg")

rosidl_generate_interfaces(${PROJECT_NAME}
  ${msg_files}
  DEPENDENCIES builtin_interfaces std_msgs geometry_msgs
  ADD_LINTER_TESTS
)

EDIT:

Here is my full msg, even though from my side, that did not make any difference:

#std_msgs/Header header

int32 ref_id
int32 loop_closure_id
int32 proximity_detection_id

geometry_msgs/Transform loop_closure_transform

####
# For statistics...
####
# std::map<int, float> posterior;
int32[] posterior_keys
float32[] posterior_values

# std::map<int, float> likelihood;
int32[] likelihood_keys
float32[] likelihood_values

# std::map<int, float> raw_likelihood;
int32[] raw_likelihood_keys
float32[] raw_likelihood_values

# std::map<int, int> weights;
int32[] weights_keys
int32[] weights_values

# std::map<int, std::string> labels;
int32[] labels_keys
string[] labels_values

# std::map<std::string, float> stats
string[] stats_keys
float32[] stats_values

# std::vector<int> local_path
int32[] local_path
int32 current_goal_id

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2 Answers

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answered 2019-08-12 11:59:47 -0500

Dirk Thomas
16276 ●62 ●190 ●215

The generated code uses PyLong_AsSize_twhich is a valid function in the Python C API: https://docs.python.org/3/c-api/long....

Maybe you are using an older not supported Python version to compile the code?

Do you have python3-dev installed - if yes, which version (dpkg -l | grep python3-dev)?

What does the following command output: cat build/rtabmap_ros/CMakeCache.txt | grep PYTHON_

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python3-dev version: 3.6.7-1~18.04

The command output:

PYTHON_EXECUTABLE:FILEPATH=/usr/bin/python3
PYTHON_INCLUDE_DIR:PATH=/usr/include/python3.6m
PYTHON_LIBRARY:FILEPATH=/usr/lib/x86_64-linux-gnu/libpython3.6m.so
PYTHON_LIBRARY_DEBUG:FILEPATH=PYTHON_LIBRARY_DEBUG-NOTFOUND
PYTHON_VERSION:STRING=
//ADVANCED property for variable: PYTHON_EXECUTABLE
PYTHON_EXECUTABLE-ADVANCED:INTERNAL=1
//ADVANCED property for variable: PYTHON_INCLUDE_DIR
PYTHON_INCLUDE_DIR-ADVANCED:INTERNAL=1
PYTHON_INSTALL_DIR:INTERNAL=lib/python3.6/site-packages
//ADVANCED property for variable: PYTHON_LIBRARY
PYTHON_LIBRARY-ADVANCED:INTERNAL=1
//ADVANCED property for variable: PYTHON_LIBRARY_DEBUG
PYTHON_LIBRARY_DEBUG-ADVANCED:INTERNAL=1
PYTHON_SOABI:INTERNAL=cpython-36m-x86_64-linux-gnu

EdwardNur ( 2019-08-12 15:30:58 -0500 )edit

The version numbers and info looks all correct. In which locations is the Python header (locate Python.h)? Also try building with VERBOSE=1 set before and post the compiler invocation which will show all used include directories.

Dirk Thomas ( 2019-08-12 15:43:56 -0500 )edit

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-1

answered 2019-08-10 14:34:09 -0500

zmk5

71 ●6 ●5 http://zmk5.github.io

updated 2019-08-10 17:54:41 -0500

The first error you are getting is because you have a misspelling. You declared the function as PyLong_AsSsize_t() instead of PyLong_AsSize_t(). You essentially added as extra s to when you declared the function.

The second says that your variable rtabmap_ros__module has an incomplete type, so there is more to the type name than just PyModuleDef maybe.

I was able to get your code to run with the following

msg/Info.msg:

int32 node_id
string node_label

string frame_id

CMakeLists.txt:

cmake_minimum_required(VERSION 3.5)
project(test_msgs)

# Default to C99
if(NOT CMAKE_C_STANDARD)
  set(CMAKE_C_STANDARD 99)
endif()

# Default to C++14
if(NOT CMAKE_CXX_STANDARD)
  set(CMAKE_CXX_STANDARD 14)
endif()

if(CMAKE_COMPILER_IS_GNUCXX OR CMAKE_CXX_COMPILER_ID MATCHES "Clang")
  add_compile_options(-Wall -Wextra -Wpedantic)
endif()

# find dependencies
find_package(ament_cmake REQUIRED)
find_package(std_msgs REQUIRED)
find_package(builtin_interfaces REQUIRED)
find_package(rosidl_default_generators REQUIRED)

set(msg_files
  "msg/Info.msg"
)

rosidl_generate_interfaces(${PROJECT_NAME}
  ${msg_files}
  DEPENDENCIES builtin_interfaces std_msgs
  ADD_LINTER_TESTS
)

if(BUILD_TESTING)
  find_package(ament_lint_auto REQUIRED)
  ament_lint_auto_find_test_dependencies()
endif()

ament_package()

and package.xml:

<?xml version="1.0"?>
<?xml-model href="http://download.ros.org/schema/package_format3.xsd" schematypens="http://www.w3.org/2001/XMLSchema"?>
<package format="3">
  <name>test_msgs</name>
  <version>0.0.0</version>
  <description>TODO: Package description</description>
  <maintainer email="some@email.com">zmk5</maintainer>
  <license>TODO: License declaration</license>

  <buildtool_depend>ament_cmake</buildtool_depend>

  <build_depend>std_msgs</build_depend>
  <build_depend>builtin_interfaces</build_depend>
  <build_depend>rosidl_default_generators</build_depend>

  <test_depend>ament_lint_auto</test_depend>
  <test_depend>ament_lint_common</test_depend>

  <exec_depend>std_msgs</exec_depend>
  <exec_depend>builtin_interfaces</exec_depend>
  <exec_depend>rosidl_default_runtime</exec_depend>

  <member_of_group>rosidl_interface_packages</member_of_group>

  <export>
    <build_type>ament_cmake</build_type>
  </export>
</package>

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@zmk5 yes but isn't something that ROS2 generated those python files? Because if you look at the files location, that was generated bu rosidl generator, not by me.

EdwardNur ( 2019-08-10 15:38:47 -0500 )edit

I guess I'm not sure what you were doing to begin with. Are you compiling your own message? What does your CMakeLists.txt file look like? is the message you wrote the whole file .msg file you want to generate?

zmk5 ( 2019-08-10 16:32:24 -0500 )edit

@zmk5 I have edited with CMakeLists.

EdwardNur ( 2019-08-10 16:38:45 -0500 )edit

Are these in your package.xml file?

<build_depend>builtin_interfaces</build_depend>
<build_depend>rosidl_default_generators</build_depend>
<exec_depend>builtin_interfaces</exec_depend>
<exec_depend>rosidl_default_runtime</exec_depend>

I've tried compiling your message, but I can't seem to get the same error you are getting.

zmk5 ( 2019-08-10 16:49:21 -0500 )edit

Also if you are using std_msgs and geometry_msgs as dependencies you should add them to find_package and in your package.xml.

zmk5 ( 2019-08-10 17:46:39 -0500 )edit

@zmk5 Hmm, that is stange. The thing is that I did not write those functions where I am getting errors, I am pretty sure that rosidle_generator has some script which creates those functions based on the messages, as if you look at the location of the file, it is stored inside the folder of rosidl generator, not my folders. Yes, I have the same package.xml. I have also edited with my full message but the reason I did not paste it is to preserve the simplicity as even if I remove them, I get the same errors. May be I have some broken binaries of ROS2 dashing? I installed on Ubuntu via binaries 1 month ago

EdwardNur ( 2019-08-11 04:52:57 -0500 )edit

Maybe update your packages using sudo apt update && sudo apt upgrade? Could be a fix in the newer versions. I had an issue recently that was fixed by just updating my packages.

zmk5 ( 2019-08-11 11:24:04 -0500 )edit

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