How to link prebuilt .so files using CMakeLists.txt

Question

I am trying to use cmake with android studio to compile c++ code, and I have a .so library which needs to be linked with the target.

I am new to cmake and this is what I have:

add_library(
    my_target
    SHARED
    ${SRCS}
)

find_library(
    SSL
    apex_fips_libs/libccmssl.so
)

target_link_libraries(
    my_target
    ${SSL}
)

Folder structure:

-- Src
   -- some.cpp
   -- some2.cpp
   -- CMakeLists.txt
   -- apex_fips_libs
       --libccmssl.so

But I am getting following error:

CMake Error: The following variables are used in this project, but they are set to NOTFOUND.
Please set them or make sure they are set and tested correctly in the CMake files:
  SSL

I understand that SSL is not being set as find_library does not find the .so , but why?

I even tried using the absolute path. Can someone point me to the correct way of doing this?

Thank You.

Answer 1

If you're guaranteed to have that library there already built then perhaps this is the easiest solution

target_link_libraries(my_target ${CMAKE_SOURCE_DIR}/apex_fips_libs/libccmssl.so)

Otherwise you might want to try something more like

find_library(SSL NAMES ccmssl PATHS ${CMAKE_SOURCE_DIR}/apex_fips_libs)
target_link_libraries(my_target ${SSL})