Shared library .so version (#3407)

Co-authored-by: John Paul Adrian Glaubitz <[email protected]>

CMakeLists.txt

@@ -14,6 +14,12 @@ set(INSTALL_CMAKE_DIR lib/cmake CACHE PATH "Installation directory for cmake fil
 
 set(CMAKE_FIND_PACKAGE_PREFER_CONFIG TRUE)
 
+# Version number
+set(VERSION_MAJOR 1)
+set(VERSION_MINOR 3)
+set(VERSION_PATCH 18)
+
+
 option(S2N_NO_PQ "Disables all Post Quantum Crypto code. You likely want this
 for older compilers or uncommon platforms." OFF)
 option(S2N_NO_PQ_ASM "Turns off the ASM for PQ Crypto even if it's available for the toolchain.
@@ -239,6 +245,9 @@ file(GLOB S2N_SRC
 add_library(${PROJECT_NAME} ${S2N_HEADERS} ${S2N_SRC})
 set_target_properties(${PROJECT_NAME} PROPERTIES LINKER_LANGUAGE C)
 
+set_target_properties(${PROJECT_NAME} PROPERTIES VERSION ${VERSION_MAJOR}.${VERSION_MINOR}.${VERSION_PATCH})
+set_target_properties(${PROJECT_NAME} PROPERTIES SOVERSION ${VERSION_MAJOR})
+
 set(CMAKE_C_FLAGS_DEBUGOPT "")
 
 target_compile_options(${PROJECT_NAME} PRIVATE -pedantic -std=gnu99 -Wall -Wimplicit -Wunused -Wcomment -Wchar-subscripts