Dlib: The imported target "dlib::dlib" references the file "/usr/lib/libdlib.a" but this file does not exist

[sarmadm]

When including dlib in a custom project using CMake

find_package(dlib REQUIRED)
include_directories(${dlib_INCLUDE_DIRS})

cmakelist file :

cmake_minimum_required(VERSION 2.8.3)
project(gazr)

add_definitions(-std=c++11)


find_package(dlib REQUIRED)
include_directories(${dlib_INCLUDE_DIRS})

option(DEBUG "Enable debug visualizations" ON)
option(WITH_TOOLS "Compile sample tools" ON)
option(WITH_ROS "Build ROS nodes" OFF)

if(WITH_ROS)

find_package(catkin REQUIRED COMPONENTS 
    roscpp 
    tf
    std_msgs
    visualization_msgs
    sensor_msgs
    cv_bridge
    image_transport
    image_geometry
    )

    include_directories(${catkin_INCLUDE_DIRS})

   catkin_package(
   CATKIN_DEPENDS 
      tf
    DEPENDS OpenCV
   LIBRARIES 
   )
   endif()

   if(DEBUG)
   find_package(OpenCV COMPONENTS core imgproc calib3d highgui REQUIRED)
   else()
   find_package(OpenCV COMPONENTS core imgproc calib3d REQUIRED)
   endif()

    message(STATUS "OpenCV version: ${OpenCV_VERSION}")
  if(${OpenCV_VERSION} VERSION_GREATER 2.9.0)
  set(OPENCV3 TRUE)
  add_definitions(-DOPENCV3)
  endif()



 if(DEBUG)
add_definitions(-DHEAD_POSE_ESTIMATION_DEBUG)
 endif()

 include_directories(${OpenCV_INCLUDE_DIRS})

 add_library(gazr SHARED src/head_pose_estimation.cpp)
 target_link_libraries(gazr ${dlib_LIBRARIES} ${OpenCV_LIBRARIES})

if(WITH_ROS)

add_executable(estimate_focus src/estimate_focus.cpp)
target_link_libraries(estimate_focus ${catkin_LIBRARIES} ${OpenCV_LIBRARIES})

add_executable(estimate src/head_pose_estimation_ros.cpp src/ros_head_pose_estimator.cpp)
target_link_libraries(estimate gazr ${catkin_LIBRARIES})

install(TARGETS estimate_focus gazr estimate
ARCHIVE DESTINATION ${CATKIN_PACKAGE_LIB_DESTINATION}
LIBRARY DESTINATION ${CATKIN_PACKAGE_LIB_DESTINATION}
RUNTIME DESTINATION ${CATKIN_PACKAGE_BIN_DESTINATION}
)

install(FILES
    launch/gazr.launch
    launch/gazr_gscam.launch
    calib/logitech-c920_640x360.ini
    share/shape_predictor_68_face_landmarks.dat
    DESTINATION ${CATKIN_PACKAGE_SHARE_DESTINATION}
 )
 endif()

 if(WITH_TOOLS)

if(OPENCV3)
    find_package(OpenCV COMPONENTS core imgproc calib3d highgui imgcodecs videoio     REQUIRED)
  else()
    find_package(OpenCV COMPONENTS core imgproc calib3d highgui REQUIRED)
    endif()

 find_package(Boost COMPONENTS program_options REQUIRED)

  add_executable(gazr_benchmark_head_pose_single_frame       tools/benchmark_head_pose_estimation_single_frame.cpp)
target_link_libraries(gazr_benchmark_head_pose_single_frame gazr ${OpenCV_LIBRARIES})

add_executable(gazr_estimate_head_direction tools/estimate_head_direction.cpp)
target_link_libraries(gazr_estimate_head_direction gazr ${OpenCV_LIBRARIES} ${Boost_LIBRARIES})

add_executable(gazr_show_head_pose tools/show_head_pose.cpp)
target_link_libraries(gazr_show_head_pose gazr ${OpenCV_LIBRARIES} ${Boost_LIBRARIES})

endif()

I get the following error:

  CMake Error at /usr/lib/cmake/dlib/dlib.cmake:76 (message):
  The imported target "dlib::dlib" references the file

  "/usr/lib/libdlib.a"

  but this file does not exist.  Possible reasons include:

* The file was deleted, renamed, or moved to another location.

* An install or uninstall procedure did not complete successfully.

* The installation package was faulty and contained

   "/usr/lib/cmake/dlib/dlib.cmake"

   but not all the files it references.

 Call Stack (most recent call first):
/usr/lib/cmake/dlib/dlibConfig.cmake:35 (include)
CMakeLists.txt:7 (find_package)

[davisking]

Where does /usr/lib/cmake/dlib/dlibConfig.cmake come from? Some package manager or something?

[sarmadm]

I changed cmakelists these two lines :

find_package(dlib REQUIRED)
include_directories(${dlib_INCLUDE_DIRS})

into

set(DLIB_PATH "" CACHE PATH "Path to DLIB")
include(/home/ubuntu/dlib-19.0/dlib/cmake)

the cmake .. done without errors , but make shows this :

ubuntu@ubuntu:~/gazr/build$ make
[ 3%] Built target gazr
[ 4%] Linking CXX executable gazr_benchmark_head_pose_single_frame
CMakeFiles/gazr_benchmark_head_pose_single_frame.dir/tools/benchmark_head_pose_estimation_single_frame.cpp.o: In function _GLOBAL__sub_I_main': benchmark_head_pose_estimation_single_frame.cpp:(.text.startup+0x895): undefined reference toUSER_ERROR__missing_dlib_all_source_cpp_file__OR__inconsistent_use_of_DEBUG_or_ENABLE_ASSERTS_preprocessor_directives_'
libgazr.so: undefined reference to dlib::base64::~base64()' libgazr.so: undefined reference todlib::entropy_decoder_kernel_2::get_target(unsigned int)'
libgazr.so: undefined reference to dlib::entropy_decoder_kernel_2::decode(unsigned int, unsigned int)' libgazr.so: undefined reference todlib::entropy_decoder_kernel_2::~entropy_decoder_kernel_2()'
libgazr.so: undefined reference to cblas_dgemm' libgazr.so: undefined reference todlib::base64::decode(std::istream&, std::ostream&) const'
libgazr.so: undefined reference to dgesvd_' libgazr.so: undefined reference todlib::entropy_decoder_kernel_2::entropy_decoder_kernel_2()'
libgazr.so: undefined reference to dlib::entropy_decoder_kernel_2::set_stream(std::istream&)' libgazr.so: undefined reference todlib::base64::base64()'
collect2: error: ld returned 1 exit status
CMakeFiles/gazr_benchmark_head_pose_single_frame.dir/build.make:104: recipe for target 'gazr_benchmark_head_pose_single_frame' failed
make[2]: * [gazr_benchmark_head_pose_single_frame] Error 1
CMakeFiles/Makefile2:104: recipe for target 'CMakeFiles/gazr_benchmark_head_pose_single_frame.dir/all' failed
make[1]: [CMakeFiles/gazr_benchmark_head_pose_single_frame.dir/all] Error 2
Makefile:83: recipe for target 'all' failed
make: ** [all] Error 2

[davisking]

Link to dlib. The examples/CMakeList.txt is an example of a working
CMakeLists.txt file.

[sarmadm]

now cmake .. is successful but ( make )is showing this error

ubuntu@ubuntu:~/gazr/build$ make

Scanning dependencies of target gazr
[ 12%] Building CXX object CMakeFiles/gazr.dir/src/head_pose_estimation.cpp.o
In file included from /home/tofi/gazr/src/head_pose_estimation.cpp:11:0:
/home/tofi/gazr/src/head_pose_estimation.hpp:5:25: fatal error: dlib/opencv.h: No such file or directory
#include
^
compilation terminated.

[e-fominov]

I changed cmakelists these two lines :
find_package(dlib REQUIRED)
include_directories(${dlib_INCLUDE_DIRS})
into
set(DLIB_PATH "" CACHE PATH "Path to DLIB")
include(/home/ubuntu/dlib-19.0/dlib/cmake)

No need to make such changes. I have working projects that uses this lines and all fine

find_package(dlib REQUIRED)
include_directories(${dlib_INCLUDE_DIRS})
link_directories(${DLIB_LIBRARY_DIRS})

Looks like you dont have correctly installed Dlib in your system. Follow this steps and it should help

git clone https://github.com/davisking/dlib
cd dlib
mkdir build
cmake ..
sudo cmake --build . --target install

After this you should be able to use Dlib from CMakeLists.txt with no including cmake file from dlib

[sarmadm]

Thanks for help. I'm confused now because dlib instructions says that :

Go into the examples folder and type:

  `mkdir build; cd build; cmake .. ; cmake --build .`

I done the instructions in your comment , how can I run dlib c++ examples ?

when I type ubuntu@ubuntu :~/dlib/build$ ./webcam_face_pose_ex

bash: ./webcam_face_pose_ex: No such file or directory

[davisking]

There are a lot of ways to compile C++ code. Dlib tries to be convenient and let you do it any way you want. The recommendations are only a small set of the possible ways you could do it. This thread had mentioned a few.

But if you aren't familiar with different C++ build methods you should just type exactly what the instructions say to do to run the examples.

[mescarra]

The error @sarmadm reports here is still an issue in Ubuntu-16.04 universe repository (and maybe other distros too). The problem arises from the fact that the dlib.cmake file checks for a static library (add_library(dlib::dlib STATIC IMPORTED)) which cannot be found because it is not installed, as a quick dpkg-query -L libdlib-dev | grep grep ".*\.a" can reveal.