Add preference to libsodium static lib

CMakeLists.txt

@@ -50,7 +50,20 @@ else()
     pkg_check_modules(LIBSODIUM QUIET libsodium)
     if(LIBSODIUM_FOUND)
         target_compile_definitions(UDPC PUBLIC UDPC_LIBSODIUM_ENABLED)
+
+        # Try to link with static lib by default.
+        foreach(LIB_DIR IN LISTS ${LIBSODIUM_LIBRARY_DIRS})
+            if(EXISTS "${LIB_DIR}/libsodium.a")
+                set(LIBSODIUM_STATIC_LIB "${LIB_DIR}/libsodium.a")
+                break()
+            endif()
+        endforeach()
+
+        if(EXISTS ${LIBSODIUM_STATIC_LIB})
+            target_link_libraries(UDPC PUBLIC ${LIBSODIUM_STATIC_LIB})
+        else()
             target_link_libraries(UDPC PUBLIC ${LIBSODIUM_LIBRARIES})
+        endif()
         target_include_directories(UDPC PUBLIC ${LIBSODIUM_INCLUDE_DIRS})
         target_compile_options(UDPC PUBLIC ${LIBSODIUM_CFLAGS_OTHER})
         message(STATUS "libsodium enabled")