[OpenWrt-Devel] Can't link to ubus / ubox from C++ package

[Tomer Eliyahu]

Hi,

Sorry if I am repeating this question (I posted it in the developers
forum and stackoverflow), but I am out of luck for 3 days now and come
to think it might be an openwrt bug, forgive me if i'm mistaken..

I am writing a GUI for openwrt which uses UBUS to get indications for
system status.

For some reason, I can't get it to compile with ubus / ubox - I keep
getting the same error:

[color=#FF0000]/local/store/openwrt/build_dir/target-arm_cortex-a7+neon-vfpv4_uClibc-0.9.33.2_eabi/ilixi_mgui-source/src/UBusThread.cpp:11:
undefined reference to `uloop_init()'[/color]

It is the same for other ubus API. I'm quite new to CPP, but linking
to other C libraries works perfectly, for examlpe blobmsg_get_u32().

BTW - I used both CMAKE and Autotools (configure), both tools produced
the same error when trying to call ubus/ubox functions.

Any thoughts?

[b]UBusThread.h:[/b]
[code]
#ifndef SRC_UBUSTHREAD_H_
#define SRC_UBUSTHREAD_H_

#include <lib/Thread.h>
#include <libubox/ustream.h>
#include <libubus.h>
#include "StatusBar.h"

namespace MGUI
{

class UBusThread : public ilixi::Thread
{
public:
    UBusThread(StatusBar* target);

    virtual
    ~UBusThread();

    virtual int
    run();

private:
    StatusBar* _bar;
    ubus_context* _ubus;
};

} /* namespace MGUI */

#endif /* SRC_UBUSTHREAD_H_ */
[/code]

[b]UBusThread.cpp:[/b]
[code]
#include "UBusThread.h"

namespace MGUI
{

UBusThread::UBusThread(StatusBar* bar)
        : Thread(),
          _bar(bar)
{
    char buf[10];
    uloop_init();
}

UBusThread::~UBusThread()
{
}

} /* namespace MGUI */
[/code]

[b]mgui/CMakeLists.txt:[/b]
[code]
#
# mgui (marvell gui) project cmake
###################################

cmake_minimum_required(VERSION 2.6)

PROJECT(MGUI)

ADD_DEFINITIONS(-Os -ggdb -Wall -Werror -Wmissing-declarations
-DMARVELL_EXTENDED)

# define resource files target install
SET(MGUI_DATADIR ${CMAKE_INSTALL_PREFIX}/share/ilixi-1.0.0)
ADD_DEFINITIONS(-DDATADIR="${MGUI_DATADIR}")

SET_DIRECTORY_PROPERTIES(PROPERTIES
    ADDITIONAL_MAKE_CLEAN_FILES
"Makefile;ipkg-install;ipkg-pxa1826;Makefile;CMakeCache.txt;CMakeFiles;cmake_install.cmake;install_manifest.txt;")

# find necessary libraries
INCLUDE(CheckLibraryExists)

find_library(json NAMES json-c json)
LIST(APPEND LIBS ubox ubus uci ${json} blobmsg_json)

find_library(librt NAMES rt librt)
LIST(APPEND LIBS ${librt})

# find ilixi-1.0.0
INCLUDE(FindPkgConfig)
PKG_CHECK_MODULES(ILIXI REQUIRED ilixi>=1.0.0)
ADD_DEFINITIONS(${ILIXI_CFLAGS})
LIST(APPEND LIBS ${ILIXI_LIBRARIES})

CONFIGURE_FILE(config.h.in config.h @ONLY)
INCLUDE_DIRECTORIES(${CMAKE_CURRENT_BINARY_DIR})

ADD_SUBDIRECTORY(src)
ADD_SUBDIRECTORY(data)
[/code]

[b]src/CMakeLists.txt[/b]
[code]

# define sources and linked libraries
SET(SOURCES
    main.cpp
    MGuiPlatform.h
    BatteryIcon.cpp
    BatteryIcon.h
    BottomBar.cpp
    BottomBar.h
    BTIcon.cpp
    BTIcon.h
    CellularIcon.cpp
    CellularIcon.h
    GPSIcon.cpp
    GPSIcon.h
    MGuiApplication.cpp
    MGuiApplication.h
    SDCardIcon.cpp
    SDCardIcon.h
    SimIcon.cpp
    SimIcon.h
    SimpleIcon.cpp
    SimpleIcon.h
    StatusBar.cpp
    StatusBar.h
    UBusThread.cpp
    UBusThread.h
    WiFiIcon.cpp
    WiFiIcon.h
)

# create and install executable
ADD_EXECUTABLE(mgui ${SOURCES})
TARGET_LINK_LIBRARIES(mgui ${LIBS})
INSTALL(TARGETS mgui RUNTIME DESTINATION bin)
[/code]
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