CMake linking not finding libraries - c++

Question

I have a executable:
add_executable(treshhold src/main.cpp)
add_dependencies(treshhold ${PROJECT_NAME})
I have a directory
/opt/halcon/lib/x64-linux
which contains multiple .so files:
hAcqArgos3D-P1xx.so hAcqGigEVision.so hAcqMatrixVisionAcquire.so hAcquEye.so hioOPC_UA.so libhalconcpp.so libhalcon.so libhdevenginecpp.so
hAcqArgos3D-P1xxxl.so hAcqGigEVisionxl.so hAcqMatrixVisionAcquirexl.so hAcquEyexl.so hioOPC_UAxl.so libhalconcppxl.so libhalconxl.so libhdevenginecppxl.so
hAcqFile.so hAcqLPS36.so hAcqO3D3xx.so hAcqVideo4Linux2.so libhalconcpp10.so libhalconc.so libhdevenginecpp10.so libuastack.so
hAcqFilexl.so hAcqLPS36xl.so hAcqO3D3xxxl.so hAcqVideo4Linux2xl.so libhalconcpp10xl.so libhalconcxl.so libhdevenginecpp10xl.so libusb-1.0-usan.so.0
linked used using and tried both:
include_directories(/opt/halcon/lib/x64-linux)
link_directories(/opt/halcon/lib/x64-linux)
But when i try a to link a certain library
target_link_libraries(treshhold libhalconc)
i get the error:
[ 50%] Linking CXX executable treshhold
/usr/bin/ld: cannot find -llibhalconc
And if i try not to make the target link i get the missing reference error from the compiler.
EDIT Full file:
cmake_minimum_required(VERSION 2.8.3)
project(ros_halcon_bridge)
find_package(catkin REQUIRED COMPONENTS
roscpp
rospy
std_msgs
)
add_executable(treshhold src/main.cpp)
add_dependencies(treshhold ${PROJECT_NAME})
include_directories(/opt/halcon/lib/x64-linux)
link_directories(/opt/halcon/lib/x64-linux)
target_link_libraries(treshhold libhalconc)
EDIT2
I would want to add all libraries with the following:
target_link_libraries(treshhold hAcqArgos3D-P1xx.so hAcqGigEVision.so hAcqMatrixVisionAcquire.so hAcquEye.so hioOPC_UA.so libhalconcpp.so libhalcon.so libhdevenginecpp.so hAcqArgos3D-P1xxxl.so hAcqGigEVisionxl.so hAcqMatrixVisionAcquirexl.so hAcquEyexl.so hioOPC_UAxl.so libhalconcppxl.so libhalconxl.so libhdevenginecppxl.so hAcqFile.so hAcqLPS36.so hAcqO3D3xx.so hAcqVideo4Linux2.so libhalconcpp10.so libhalconc.so libhdevenginecpp10.so libuastack.so hAcqFilexl.so hAcqLPS36xl.so hAcqO3D3xxxl.so hAcqVideo4Linux2xl.so libhalconcpp10xl.so libhalconcxl.so libhdevenginecpp10xl.so libusb-1.0-usan.so.0)
but that results in:
[ 50%] Linking CXX executable treshhold
/usr/bin/ld: cannot find -lhAcqArgos3D-P1xx
/usr/bin/ld: cannot find -lhAcqGigEVision
/usr/bin/ld: cannot find -lhAcqMatrixVisionAcquire
/usr/bin/ld: cannot find -lhAcquEye
/usr/bin/ld: cannot find -lhioOPC_UA
/usr/bin/ld: cannot find -lhalconcpp
/usr/bin/ld: cannot find -lhalcon
/usr/bin/ld: cannot find -lhdevenginecpp
/usr/bin/ld: cannot find -lhAcqArgos3D-P1xxxl
/usr/bin/ld: cannot find -lhAcqGigEVisionxl
/usr/bin/ld: cannot find -lhAcqMatrixVisionAcquirexl
/usr/bin/ld: cannot find -lhAcquEyexl
/usr/bin/ld: cannot find -lhioOPC_UAxl
/usr/bin/ld: cannot find -lhalconcppxl
/usr/bin/ld: cannot find -lhalconxl
/usr/bin/ld: cannot find -lhdevenginecppxl
/usr/bin/ld: cannot find -lhAcqFile
/usr/bin/ld: cannot find -lhAcqLPS36
/usr/bin/ld: cannot find -lhAcqO3D3xx
/usr/bin/ld: cannot find -lhAcqVideo4Linux2
/usr/bin/ld: cannot find -lhalconcpp10
/usr/bin/ld: cannot find -lhalconc
/usr/bin/ld: cannot find -lhdevenginecpp10
/usr/bin/ld: cannot find -luastack
/usr/bin/ld: cannot find -lhAcqFilexl
/usr/bin/ld: cannot find -lhAcqLPS36xl
/usr/bin/ld: cannot find -lhAcqO3D3xxxl
/usr/bin/ld: cannot find -lhAcqVideo4Linux2xl
/usr/bin/ld: cannot find -lhalconcpp10xl
/usr/bin/ld: cannot find -lhalconcxl
/usr/bin/ld: cannot find -lhdevenginecpp10xl
/usr/bin/ld: cannot find -lusb-1.0-usan

Answer 1

You can see what CMake is doing with
make VERBOSE=1
Then you should be able to find out what's wrong with the generated command.
Only once you're sure about the command you really want should you bother with how to write it correctly with cmake