Linking a prebuilt binary in cpp does not work? - c++

Question

I just build the following package: faiss and my cpp program now recognises all library header so I can include them into my program. But my programm throws undefined reference to. So when I built faiss it created a libfaiss.a and a libfaiss.so which one to link and how??? I think I have tried any solution that I could find in the internet, but my knowledge of the build/linking process is limited.
My Faiss build-directory looks like this:
faiss-1.5.3/
-libfaiss.a
-libfaiss.so
-foo.h
-foo.o
-foo.cpp
-bar.h
-...
My tries. (I am using ROS, catkin_simple and gtests)
So this is how I would usually do it:
find_library(LibFaiss faiss HINT /home/tim/faiss/faiss-1_5_3/faiss-1.5.3/)
catkin_add_gtest(test_inverted_nn test/test_inverted-nn.cc
WORKING_DIRECTORY ${CMAKE_BINARY_DIR}})
target_link_libraries(test_inverted_nn ${LIBRARY_NAME} ${LibFaiss})
I get the following Error:
/usr/bin/ld: cannot find -lLibFaiss-NOTFOUND}
collect2: error: ld returned 1 exit status
CMakeFiles/test_inverted_nn.dir/build.make:358: recipe for target '/home/tim/catkin_ws/devel/lib/nn/test_inverted_nn' failed
make[3]: *** [/home/tim/catkin_ws/devel/lib/inverted_nn/test_inverted_nn] Error 1
I also found this Solution here Import an external library into a ROS node, but that does not work for me:
add_library(libfaiss STATIC IMPORTED)
set_target_properties(libfaiss PROPERTIES IMPORTED_LOCATION /home/tim/faiss/faiss-1_5_3/faiss-1.5.3/libfaiss.a)
target_link_libraries(test_inverted_nn ${LIBRARY_NAME} ${libfaiss})
This throws the following Error:
/usr/bin/ld: cannot find -l}
collect2: error: ld returned 1 exit status
EDIT
After correcting the not_found error I am getting the following error:
CMake Warning at /opt/ros/melodic/share/catkin/cmake/test/gtest.cmake:180 (add_executable):
Cannot generate a safe runtime search path for target
test_inverted_multi_index because files in some directories may conflict
with libraries in implicit directories:
runtime library [libz.so.1] in /usr/lib/x86_64-linux-gnu may be hidden by files in:
/usr/local/lib
Some of these libraries may not be found correctly.
*** It does not matter what I add inside target_link_libraries I am always getting that error***
EDIT2
So with the tipp of #Aconcagua I deleted everything from the CMakeLists.txt and only added the following to my cmake options:
-DCMAKE_CXX_FLAGS=-L/home/tim/faiss/faiss-1_5_3/faiss-1.5.3/
But Im still getting the undefined reference errors. It does not make any difference