Parsing error when generating code/config for protoc generated C++ code

[eliott-arkeale]

C++ code generated by protoc (protobuf compiler) can lead to parsing errors when generating C++ code or config with plcncli using one of the following commands:

plcncli generate code
plcncli generate config
plcncli generate all

Error looks like this:

exchange.pb.h(407,0): error CPP0005: A parsing exception was thrown.

parsing exception occured while parsing 'brace_group' expected '(skip([}]) + skip(multiline_ws*))' at line number 407, and character number 0

A fix has been documented on the PLCNext Community forum (here).
You have to move all your protoc generated C++ files from src to another directory. For example, rpc/. To include these files during compilation, you have to update the CMakeLists.txtconfiguration. For example, if we moved the files to a rpc/ folder like mentioned earlier, it can be done like this:

################# create target #######################################################

file(GLOB_RECURSE Headers CONFIGURE_DEPENDS src/*.h src/*.hpp src/*.hxx intermediate/code/*.h intermediate/code/*.hpp intermediate/code/*.hxx rpc/*.h)
file(GLOB_RECURSE Sources CONFIGURE_DEPENDS src/*.cpp src/*.cc intermediate/code/*.cpp rpc/*.cc)
add_library(${CMAKE_PROJECT_NAME} SHARED ${Headers} ${Sources})

#######################################################################################

################# project include-paths ###############################################

target_include_directories(${CMAKE_PROJECT_NAME}
    PUBLIC
    $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/intermediate/code>
    $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/src>
    $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/rpc>)

#######################################################################################

Alternatively, you can generate code/config files with plcncli before generating code with protoc. For instance, this fix can be used if the project is compiled with a script:

#!bin/bash

plcncli generate all
protoc --cpp_out=./ file.proto
plcncli build

[martinboers]

For reference, this zip file contains the source code that causes the parsing error in this case:
exchange.pb.zip