Compilation error caused by cv_bridge and python version problems error: return-statement with no value, in function returning'void*' [-fpe

 

/usr/include/python2.7/numpy/__multiarray_api.h:1537:144: error: return-statement with no value, in function returning ‘void*’ [-fpermissive]
 #define import_array() {if (_import_array() < 0) {PyErr_Print(); PyErr_SetString(PyExc_ImportError, "numpy.core.multiarray failed to import"); return NUMPY_IMPORT_ARRAY_RETVAL; } }

 

Reason: the code calls opencv4, the latest version of cv_bridge also uses opencv4, but the system uses python2 by default

Multiple different python and opencv versions are installed in the system

The corresponding version recognized by cv_bridged during compilation is as follows:

Print out the library version information by adding the following code to the cmakelists.txt of cv_bridge:

# Print some message showing some of them
message("##############################################")
message(STATUS "OpenCV library status:")
message(STATUS "    version: ${OpenCV_VERSION}")
message(STATUS "    libraries: ${OpenCV_LIBRARIES}")
message(STATUS "    include path: ${OpenCV_INCLUDE_DIRS}")
message("##############################################")

# Print some message showing some of them
message("##############################################")
message(STATUS "PYTHON library status:")
message(STATUS "    PYTHON_VERSION_MAJOR: ${PYTHON_VERSION_MAJOR}")
message(STATUS "    PYTHON_VERSION_MINOR: ${PYTHON_VERSION_MINOR}")
message(STATUS "    include path: ${PYTHON_NUMPY_INCLUDE_DIR}")
message("##############################################")

 

solution:

Modify python related variables from the default version 2 to version 3

In the cmakelists.txt file of the cv_bridge package, add the following code:

set(PYTHON_NUMPY_INCLUDE_DIR ~/.local/lib/python3.6/site-packages/numpy/core/include)
set(PYTHON_INCLUDE_PATH /usr/include/python3.6)

View the numpy storage directory through the command pip3 show numpy

python3 -V view python3 installation directory

 

A new error occurred:

make[2]: *** No rule to make target '/usr/lib/x86_64-linux-gnu/libboost_python37.so', needed by '/home/chenlu/uuv/devel/lib/python2.7/dist-packages/cv_bridge/boost/cv_bridge_boost.so'.  Stop.
CMakeFiles/Makefile2:8771: recipe for target 'vision_opencv/cv_bridge/src/CMakeFiles/cv_bridge_boost.dir/all' failed
make[1]: *** [vision_opencv/cv_bridge/src/CMakeFiles/cv_bridge_boost.dir/all] Error 2

Solution: Add soft connection

chenlu@chenlupc:/usr/lib/x86_64-linux-gnu$ sudo ln -s libboost_python-py36.so libboost_python37.so
chenlu@chenlupc:/usr/lib/x86_64-linux-gnu$ sudo ln -s libboost_python-py36.a libboost_python37.a