[CMake] Cmake : undefined reference to `udev_device_get_devnode'

[Nikita Barawade]

Dear All,



I am building an application using cmake with external shared library libLLAPI.so on Ububtu .


I am getting following error:


make -f Source/CMakeFiles/app.dir/build.make Source/CMakeFiles/app.dir/build
make[2]: Entering directory `/home/nikita/intel/CMake_intel/API/Build/Cmake/LLAPI_TestApp/Build'
Linking CXX executable app
cd /home/nikita/intel/CMake_intel/API/Build/Cmake/LLAPI_TestApp/Build/Source && /usr/bin/cmake -E cmake_link_script CMakeFiles/app.dir/link.txt --verbose=1
/usr/bin/c++       CMakeFiles/app.dir/__/Include/moc_cansettings.cxx.o CMakeFiles/app.dir/__/Include/moc_Logfile.cxx.o CMakeFiles/app.dir/__/Include/moc_SpmGui.cxx.o CMakeFiles/app.dir/main.cpp.o CMakeFiles/app.dir/AllModule.cpp.o CMakeFiles/app.dir/analogmeasure.cpp.o CMakeFiles/app.dir/Can.cpp.o CMakeFiles/app.dir/cansettings.cpp.o CMakeFiles/app.dir/ccTalk.cpp.o CMakeFiles/app.dir/Channel.cpp.o CMakeFiles/app.dir/Common.cpp.o CMakeFiles/app.dir/Dex.cpp.o CMakeFiles/app.dir/Fan.cpp.o CMakeFiles/app.dir/Firmware.cpp.o CMakeFiles/app.dir/Gpio.cpp.o CMakeFiles/app.dir/I2c.cpp.o CMakeFiles/app.dir/LocalPortI2C.cpp.o CMakeFiles/app.dir/LocalPortSerial.cpp.o CMakeFiles/app.dir/Logfile.cpp.o CMakeFiles/app.dir/Mdb.cpp.o CMakeFiles/app.dir/Motor.cpp.o CMakeFiles/app.dir/Onewire.cpp.o CMakeFiles/app.dir/PowerModule.cpp.o CMakeFiles/app.dir/protocolA.cpp.o CMakeFiles/app.dir/rtc.cpp.o CMakeFiles/app.dir/SafeMem.cpp.o CMakeFiles/app.dir/Serial.cpp.o CMakeFiles/app.dir/SevenSegment.cpp.o CMakeFiles/app.dir/Spi.cpp.o CMakeFiles/app.dir/SpmGui.cpp.o CMakeFiles/app.dir/ThreadProcess.cpp.o CMakeFiles/app.dir/USBRelayModule.cpp.o CMakeFiles/app.dir/WriteFile.cpp.o CMakeFiles/app.dir/app_automoc.cpp.o  -o app -rdynamic -lQtGui -lQtCore ../../../LLAPI/build/Source/libLLAPI.so -Wl,-rpath,/home/nikita/intel/CMake_intel/API/Build/Cmake/LLAPI_TestApp/Build/../../LLAPI/build/Source
CMakeFiles/app.dir/SpmGui.cpp.o: In function `SpmGui::pbPushSelectClicked()':
SpmGui.cpp:(.text+0x3904): undefined reference to `llapiVersionRead'
../../../LLAPI/build/Source/libLLAPI.so: undefined reference to `udev_device_get_devnode'
../../../LLAPI/build/Source/libLLAPI.so: undefined reference to `udev_device_new_from_syspath'
../../../LLAPI/build/Source/libLLAPI.so: undefined reference to `udev_device_unref'
../../../LLAPI/build/Source/libLLAPI.so: undefined reference to `udev_enumerate_get_list_entry'
../../../LLAPI/build/Source/libLLAPI.so: undefined reference to `udev_enumerate_add_match_subsystem'
../../../LLAPI/build/Source/libLLAPI.so: undefined reference to `udev_enumerate_scan_devices'
../../../LLAPI/build/Source/libLLAPI.so: undefined reference to `udev_device_get_sysattr_value'
../../../LLAPI/build/Source/libLLAPI.so: undefined reference to `udev_device_new_from_devnum'
../../../LLAPI/build/Source/libLLAPI.so: undefined reference to `udev_device_get_parent_with_subsystem_devtype'
../../../LLAPI/build/Source/libLLAPI.so: undefined reference to `udev_unref'
../../../LLAPI/build/Source/libLLAPI.so: undefined reference to `udev_list_entry_get_name'
../../../LLAPI/build/Source/libLLAPI.so: undefined reference to `udev_enumerate_new'
../../../LLAPI/build/Source/libLLAPI.so: undefined reference to `udev_list_entry_get_next'
../../../LLAPI/build/Source/libLLAPI.so: undefined reference to `udev_new'
../../../LLAPI/build/Source/libLLAPI.so: undefined reference to `udev_enumerate_unref'
collect2: error: ld returned 1 exit status
make[2]: *** [Source/app] Error 1
make[2]: Leaving directory `/home/nikita/intel/CMake_intel/API/Build/Cmake/LLAPI_TestApp/Build'
make[1]: *** [Source/CMakeFiles/app.dir/all] Error 2
make[1]: Leaving directory `/home/nikita/intel/CMake_intel/API/Build/Cmake/LLAPI_TestApp/Build'
make: *** [all] Error 2


Before this, while building a library libLLAPI.so I got error " fatal error: libudev.h: No such file or directory" .

It worked fine after installing libudev-dev .


CmakeList.txt  for app:

include_directories (../../../Lib/LLAPI/Include)
include_directories (../Include)
include_directories (../../LLAPI/Include)
include_directories (../../../Build/Cmake/LLAPI_TestApp/Build/Source)

QT4_WRAP_UI(UISrcs ../Form/cansettings.ui ../Form/Logfile.ui ../Form/ssbGui.ui)
QT4_WRAP_CPP(MOCSrcs ../Include/cansettings.h ../Include/Logfile.h ../Include/ssbGui.h)

add_library(LLAPI SHARED IMPORTED)
set_property(TARGET LLAPI PROPERTY IMPORTED_LOCATION ${CMAKE_BINARY_DIR}/../../LLAPI/build/Source/libLLAPI.so)

add_executable (app ${UISrcs} ${MOCSrcs} main.cpp cansettings.cpp Logfile.cpp ssbGui.cpp)

target_link_libraries (app ${QT_LIBRARIES} LLAPI)
#target_link_libraries (app ${QT_LIBRARIES} Qt4::QtGui Qt4::QtXml LLAPI)

install (TARGETS app RUNTIME DESTINATION ${PROJECT_BINARY_DIR}/lib)


Searched on Internet for solution but could not fix it.

Please guide .



Regards,
Nikita
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