cmake: Add option to build shared libs

See https://cmake.org/cmake/help/latest/variable/BUILD_SHARED_LIBS.html

Signed-off-by: Andreas Schneider <asn@cryptomilk.org>
Reviewed-by: Anderson Toshiyuki Sasaki <ansasaki@redhat.com>

CMakeLists.txt

@@ -222,6 +222,7 @@ message(STATUS "Server support : ${WITH_SERVER}")
 message(STATUS "GSSAPI support : ${WITH_GSSAPI}")
 message(STATUS "GEX support : ${WITH_GEX}")
 message(STATUS "Pcap debugging support : ${WITH_PCAP}")
+message(STATUS "Build shared library: ${BUILD_SHARED_LIBS}")
 message(STATUS "Unit testing: ${UNIT_TESTING}")
 message(STATUS "Client code testing: ${CLIENT_TESTING}")
 message(STATUS "Blowfish cipher support: ${WITH_BLOWFISH_CIPHER}")

DefineOptions.cmake

@@ -10,6 +10,7 @@ option(WITH_MBEDTLS "Compile against libmbedtls" OFF)
 option(WITH_BLOWFISH_CIPHER "Compile with blowfish support" OFF)
 option(WITH_PCAP "Compile with Pcap generation support" ON)
 option(WITH_INTERNAL_DOC "Compile doxygen internal documentation" OFF)
+option(BUILD_SHARED_LIBS "Build shared libraries" ON)
 option(UNIT_TESTING "Build with unit tests" OFF)
 option(CLIENT_TESTING "Build with client tests; requires openssh" OFF)
 option(SERVER_TESTING "Build with server tests; requires openssh and dropbear" OFF)