Create a shared lib that depends on dlib using Cmake - c++11

Question

I'm building a shared library in C++ that depends on dlib using CMake.
While it has been possible for me to build and install a shared dlib using make and make install, so far I haven't figured out the way to link to this shared dlib library.
The examples of usage given in the DLib website always link to a static library.
This is what I have so far:
cmake_minimum_required(VERSION 2.8.12)
project(face_align)
set(CMAKE_CXX_STANDARD 11)
find_package(dlib)
add_library(face_align SHARED src/mylib.cpp)
target_link_libraries(face_align dlib::dlib)
The linker complains like so:
/usr/bin/ld: cannot find -ldlib::dlib
collect2: error: ld returned 1 exit status
CMakeFiles/face_align.dir/build.make:94: recipe for target 'libface_align.so' failed
make[2]: *** [libface_align.so] Error 1
CMakeFiles/Makefile2:67: recipe for target 'CMakeFiles/face_align.dir/all' failed
make[1]: *** [CMakeFiles/face_align.dir/all] Error 2
Makefile:83: recipe for target 'all' failed
make: *** [all] Error 2
If I remove the SHARED from
add_library(face_align SHARED src/mylib.cpp) the project builds successfully. This makes me think that dlib:dlib is pointing to the static library. I see that there is a dlib:dlib_shared but no success linking to this one either.

Answer 1

The answer seems to be (1) linking to dlib as a static library (2) making the code linking to dlib position independent:
cmake_minimum_required(VERSION 2.8.12)
project(face_align)
set(CMAKE_CXX_STANDARD 11)
# Unfortunately, this only links dlib as static library
add_subdirectory(libs/dlib dlib_build)
add_library(face_align SHARED src/mylib.cpp)
# This makes the target position independent, allowing to link an static library to a dynamic one.
set_target_properties(face_align PROPERTIES POSITION_INDEPENDENT_CODE ON) # This made it work
# Link Dlib
target_link_libraries(face_align dlib::dlib)
EDIT:
Also, in Linux (I haven't tested this in other S.O.s) CMake does some magic and, after installing dlib library in shared mode:
$ cd $DLIB
$ mkdir build && cd build
$ cmake ../dlib
$ make && make install
Is possible to simply add the library using target_link_libraries as follows:
cmake_minimum_required(VERSION 2.8.12)
project(face_align)
set(CMAKE_CXX_STANDARD 11)
add_library(face_align SHARED src/mylib.cpp)
# Link Dlib
target_link_libraries(face_align dlib)
Then, in your code, include headers as follows:
#include <dlib/your_dlib_header_here.h>