Why qt class can't be combined with some C++ source code

stackprogramer

I am developing some features on some open-source projects, but I observe that open source code can be compiled successfully with g++ and cmake....
but when i import cmake project and it can compile successfully in qt....
my problom is where that i want to add some layers that use qt classed i faced with too many strange errors.....
for special case for srsran project when I used this section i have too many erros....How can overcome this problem in qt? This is only one problem but altogether Qt with other source cpp i faced with too many strange errors....

can anyone guide me? Thanks in advance

cmake section


######Custom CMake setction for creating GUI ENB

set(CMAKE_INCLUDE_CURRENT_DIR ON)
set(CMAKE_AUTOUIC ON)
set(CMAKE_AUTOMOC ON)
set(CMAKE_AUTORCC ON)

#set(CMAKE_CXX_STANDARD 20)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
# modify the actual value of the current directory's `COMPILE_OPTIONS` (copy from above line remains unchanged). subdirectories inherit a copy of their parent's `COMPILE_OPTIONS` at the time the subdirectory is processed.
add_compile_options(-Wno-error)

find_package(Qt5 COMPONENTS Widgets REQUIRED )

add_executable(LTEeNB
    #main.cc
    main.cpp
    enb_layer.cpp
    enb_layer.h
    mainwindow.cpp
    mainwindow.h
    mainwindow.ui
    config_enb_layer.h
    enb_helper_functions.h
    enbthread.cpp
    enbthread.h
    ../enb.cc
    ../metrics_stdout.cc
    ../metrics_csv.cc
    ../metrics_json.cc
    ../metrics_e2.cc
    #../enb_cfg_parser.cc
  )

target_link_libraries(LTEeNB PRIVATE
                                ${SRSENB_SOURCES}
                                ${SRSRAN_SOURCES}
                                ${CMAKE_THREAD_LIBS_INIT}
                                ${Boost_LIBRARIES}
                                ${SEC_LIBRARIES}
                                ${LIBCONFIGPP_LIBRARIES}
                                ${SCTP_LIBRARIES}
                                enb_cfg_parser
                                srsran_common
                                srsgnb_rrc_config_utils
                                ${LIBCONFIGPP_LIBRARIES}
                                Qt5::Widgets


  )

Source Code

#include <poll.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/mman.h>
#include <unistd.h>

#include "srsran/common/common_helper.h"
#include "srsran/common/config_file.h"
#include "srsran/common/crash_handler.h"
#include "srsran/common/tsan_options.h"
#include "srsran/srslog/event_trace.h"
#include "srsran/srslog/srslog.h"
#include "srsran/support/emergency_handlers.h"
#include "srsran/support/signal_handler.h"

#include <boost/program_options.hpp>
#include <boost/program_options/parsers.hpp>
#include <iostream>
#include <memory>
#include <srsran/common/string_helpers.h>
#include <string>

#include "srsenb/hdr/enb.h"
#include "srsenb/hdr/metrics_csv.h"
#include "srsenb/hdr/metrics_e2.h"
#include "srsenb/hdr/metrics_json.h"
#include "srsenb/hdr/metrics_stdout.h"
#include "srsran/common/enb_events.h"


class enb_layer
{
  //Q_OBJECT
public:
  //public:public:
  enb_layer();
  ~enb_layer();
  int start(int argc, char* argv[]);
  void stop();


};

Error:

/...../lib/include/srsran/asn1/e2sm_kpm_v2.h:56: error: expected ‘}’ before ‘::’ token
   56 | #define None std::numeric_limits<uint32_t>::max()
      |                 ^~

Paul Colby

Hi @stackprogramer,

It looks to me like the compiler is interpreting the code in e2sm_kpm_v2.h as (plane old) C, and not C++. This is probably because one of your *.cc files is including the header (either directly, or indirectly), and CMake is (again, probably) assuming your *.cc files are C (not C++).

You could rename all *.cc files to *.cpp, or tell CMake some other way that they're all C++.

Or if you really do need to mix C and C++ code, you will need to ensure that the C and C++ headers are also separated - eg consider using a *.hpp extension for the C++ headers.

Hope that helps point you in the right direction.

Cheers.

stackprogramer

@Paul-Colby
But new question how can mix c and cpp code that we have not any problems.....when i change header file in cpp to hpp we have problems and errors yet.....

mpergand

@stackprogramer
Maybe you need to use extern "C"
https://stackoverflow.com/questions/12066279/using-c-libraries-for-c-programs

stackprogramer

@mpergand @Paul-Colby Thanks very much,Finally my problem is solved. I defined a pure cpp layer call c function in it and ...i used this layer in other qt classes...