ESP32 Forum

Posted: **Thu Jan 11, 2024 1:17 pm**

Hello,

we are currently trying to get the code generation for some proto files working in our project.
We followed https://docs.espressif.com/projects/esp ... generation and added the following lines into out component CMakeLists.txt:

Code: Select all

idf_component_register(SRCS 
    "main.cpp"
    "protocol.pb.cc"
)

message(WARNING "COMPONENT_LIB '${COMPONENT_LIB}'")

add_custom_command(
    WORKING_DIRECTORY ${COMPONENT_DIR}
    DEPENDS protocol.proto
    COMMAND echo XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
    COMMAND protoc --proto_path=${COMPONENT_DIR} --cpp_out=${COMPONENT_DIR} protocol.proto
    OUTPUT ${COMPONENT_DIR}/protocol.pb.cc ${COMPONENT_DIR}/protocol.pb.h
)

add_custom_target(
    generate_protobuf
    DEPENDS ${COMPONENT_DIR}/protocol.pb.cc ${COMPONENT_DIR}/protocol.pb.h
)

add_dependencies(
    ${COMPONENT_LIB} generate_protobuf
)

set_property(DIRECTORY "${COMPONENT_DIR}" APPEND PROPERTY
     ADDITIONAL_MAKE_CLEAN_FILES protocol.pb.h protocol.pb.cc)

The used versions are:

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PACKAGES: 
 - framework-arduinoespressif32 @ 3.20005.220925 (2.0.5) 
 - framework-espidf @ 3.40402.0 (4.4.2) 
 - tool-cmake @ 3.16.4 
 - tool-esptoolpy @ 1.40201.0 (4.2.1) 
 - tool-ninja @ 1.7.1 
 - toolchain-esp32ulp @ 1.22851.191205 (2.28.51) 
 - toolchain-xtensa-esp32 @ 8.4.0+2021r2-patch3

When we try to build it, we get the following issues:

Code: Select all

*** [.pio/build/esp32dev/src/protocol.pb.o] Source `src/protocol.pb.cc' not found, needed by target `.pio/build/esp32dev/src/protocol.pb.o'.

The .pb.cc and pb.h files are not generated.
We had a look into the generated build.ninja file and could not find a dependency between __idf_src and generate_protobuf, as if the add_dependencies was ignored.

What is wrong here?

Thanks in advance
Florian

ESP32 Forum

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