google/protobuf/pyext/descriptor_containers.cc:69:45: error: invalid conversion from ‘const char*’ to ‘char*’ [-fpermissive]

[ratankumar shivaratri]

Hi All,

Basically I am following the tutorial from the below link.

https://github.com/EdjeElectronics/TensorFlow-Object-Detection-on-the-Raspberry-Pi

I have reached till the point where I have to run the below command.

"python3 setup.py build --cpp_implementation" 

I am using Raspberry pi 4 B model. Python version is 3.7

after running the command i have received the below error.

"

pi@raspberrypi:~/protobuf-3.5.1/python $ python3 setup.py build --cpp_implementation

running build

running build_py

running build_ext

building 'google.protobuf.pyext._message' extension

arm-linux-gnueabihf-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -g -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -fPIC -I. -I../src -I/usr/include/python3.7m -c google/protobuf/pyext/descriptor_database.cc -o build/temp.linux-armv7l-3.7/google/protobuf/pyext/descriptor_database.o -Wno-write-strings -Wno-invalid-offsetof -Wno-sign-compare

arm-linux-gnueabihf-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -g -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -fPIC -I. -I../src -I/usr/include/python3.7m -c google/protobuf/pyext/repeated_composite_container.cc -o build/temp.linux-armv7l-3.7/google/protobuf/pyext/repeated_composite_container.o -Wno-write-strings -Wno-invalid-offsetof -Wno-sign-compare

arm-linux-gnueabihf-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -g -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -fPIC -I. -I../src -I/usr/include/python3.7m -c google/protobuf/pyext/descriptor_containers.cc -o build/temp.linux-armv7l-3.7/google/protobuf/pyext/descriptor_containers.o -Wno-write-strings -Wno-invalid-offsetof -Wno-sign-compare

google/protobuf/pyext/descriptor_containers.cc: In function ‘bool google::protobuf::python::descriptor::_GetItemByKey(google::protobuf::python::PyContainer*, PyObject*, const void**)’:

google/protobuf/pyext/descriptor_containers.cc:69:45: error: invalid conversion from ‘const char*’ to ‘char*’ [-fpermissive]

        ((*(charpp) = PyUnicode_AsUTF8AndSize(ob, (sizep))) == NULL? -1: 0): \

                      ~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~

google/protobuf/pyext/descriptor_containers.cc:172:13: note: in expansion of macro ‘PyString_AsStringAndSize’

         if (PyString_AsStringAndSize(key, &name, &name_size) < 0) {

             ^~~~~~~~~~~~~~~~~~~~~~~~

google/protobuf/pyext/descriptor_containers.cc:69:45: error: invalid conversion from ‘const char*’ to ‘char*’ [-fpermissive]

        ((*(charpp) = PyUnicode_AsUTF8AndSize(ob, (sizep))) == NULL? -1: 0): \

                      ~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~

google/protobuf/pyext/descriptor_containers.cc:189:13: note: in expansion of macro ‘PyString_AsStringAndSize’

         if (PyString_AsStringAndSize(key, &camelcase_name, &name_size) < 0) {

             ^~~~~~~~~~~~~~~~~~~~~~~~

error: command 'arm-linux-gnueabihf-gcc' failed with exit status 1

"

Please suggest on how to resolve it. I followed the below options but it did not resolve.

https://github.com/jgarff/rpi_ws281x/issues/294

sudo apt-get update
sudo apt-get install build-essential python-dev git scons swig

sudo apt-get install libzbar-dev libzbar0

sudo apt install python-dev

sudo apt-get install portaudio19-dev

sudo apt install -y python python-pip libffi-dev python-backports.ssl-match-hostname

[Adam Cozzette]

I believe that is due to an API change in Python 3.7 which was fixed in protobuf with this pull request: https://github.com/protocolbuffers/protobuf/pull/4862 If you use a more recent version of protobuf then that should fix the problem.

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[ratankumar shivaratri]

Hi Adam,

Thanks for the suggestion. I have upgraded the protobuf version to 3.9.2 and the issue has been resolved. :)

Is there any option to mark this as resolved or solved or answered?

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[Adam Cozzette]

Great, I'm glad the upgrade solved the problem. I don't think there is any way to mark the mailing list thread resolved so no need to worry about that.

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