Allow to build as a shared library.

Respect BUILD_SHARED_LIBS with fallback to the previous behaviour for
the special target (official static binary).

To build tg_owt as a shared library, use `-DBUILD_SHARED_LIBS:BOOL=ON`.
If you want a static library, use `-DBUILD_SHARED_LIBS:BOOL=OFF`.

Signed-off-by: Vitaly Zaitsev <[email protected]>

CMakeLists.txt

@@ -5,7 +5,6 @@ cmake_policy(SET CMP0091 NEW)
 set_property(GLOBAL PROPERTY USE_FOLDERS ON)
 
 set(TG_OWT_SPECIAL_TARGET "" CACHE STRING "Use special platform target, like 'macstore' for Mac App Store.")
-option(TG_OWT_USE_PROTOBUF "Use protobuf to generate additional headers. Useful for packaged build." OFF)
 
 if (NOT TG_OWT_SPECIAL_TARGET STREQUAL "osx")
     set(CMAKE_OSX_DEPLOYMENT_TARGET 10.12 CACHE STRING "Minimum OS X deployment version" FORCE)
@@ -19,6 +18,9 @@ else()
     set(TG_OWT_PACKAGED_BUILD 1)
 endif()
 
+option(BUILD_SHARED_LIBS "Builds shared libraries instead of static." ${TG_OWT_PACKAGED_BUILD})
+option(TG_OWT_USE_PROTOBUF "Use protobuf to generate additional headers. Useful for packaged build." ${BUILD_SHARED_LIBS})
+
 project(tg_owt
     LANGUAGES C CXX ASM
     DESCRIPTION "WebRTC build for Telegram"
@@ -59,9 +61,11 @@ if (TG_OWT_USE_PROTOBUF)
     add_subdirectory(cmake/protobuf)
 endif()
 
-add_library(tg_owt STATIC)
+add_library(tg_owt)
 init_target(tg_owt)
 
+set_target_properties(tg_owt PROPERTIES SOVERSION 0 VERSION 0.0.0)
+
 if (is_x86 OR is_x64)
     target_link_libraries(tg_owt
     PUBLIC