Add options to choose between static and dynamic libraries

Author: Vincent Raman

CMakeLists.txt

@@ -1,6 +1,9 @@
 cmake_minimum_required(VERSION 3.1.0 FATAL_ERROR)
 PROJECT(sioclient)
 
+option(BUILD_SHARED_LIBS "Build the shared library" OFF)
+option(Boost_USE_STATIC_LIBS "Use Boost static version" ON)
+
 if(NOT CMAKE_BUILD_TYPE )
 MESSAGE(STATUS "not define build type, set to release" )
 set(CMAKE_BUILD_TYPE Release )
@@ -11,7 +14,6 @@ endif()
 
 set(BOOST_VER "1.55.0" CACHE STRING "boost version" )
 
-set(Boost_USE_STATIC_LIBS ON) 
 set(Boost_USE_MULTITHREADED ON) 
 set(Boost_USE_STATIC_RUNTIME OFF) 
 find_package(Boost ${BOOST_VER} REQUIRED COMPONENTS system date_time random) 
@@ -21,7 +23,7 @@ aux_source_directory(${CMAKE_CURRENT_LIST_DIR}/src/internal ALL_SRC)
 file(GLOB ALL_HEADERS ${CMAKE_CURRENT_LIST_DIR}/src/*.h )
 set(SIO_INCLUDEDIR ${CMAKE_CURRENT_LIST_DIR})
 
-add_library(sioclient STATIC ${ALL_SRC}) 
+add_library(sioclient ${ALL_SRC})
 target_include_directories(sioclient PRIVATE ${Boost_INCLUDE_DIRS} 
     ${CMAKE_CURRENT_LIST_DIR}/src 
     ${CMAKE_CURRENT_LIST_DIR}/lib/websocketpp 
@@ -35,7 +37,7 @@ list(APPEND TARGET_LIBRARIES sioclient)
 
 find_package(OpenSSL)
 if(OPENSSL_FOUND)
-add_library(sioclient_tls STATIC ${ALL_SRC})
+add_library(sioclient_tls ${ALL_SRC})
 target_include_directories(sioclient_tls PRIVATE ${Boost_INCLUDE_DIRS} 
     ${CMAKE_CURRENT_LIST_DIR}/src 
     ${CMAKE_CURRENT_LIST_DIR}/lib/websocketpp