build: add soname to shared libraries

Use PROJECT_VERSION.API_LEVEL.RELEASE_DATE as soname to enable
applications to select and link against shared libraries based
on their SO versions.

Author: bkmgit

CMakeLists.txt

@@ -69,6 +69,16 @@ option (Seastar_DEPRECATED_OSTREAM_FORMATTERS
   "Enable operator<< for formatting standard library containers, which will be deprecated in future"
   ON)
 
+set (Seastar_RELEASE_DATE
+  20221127
+  CACHE
+  STRING
+  "Last release date")
+
+set_property (CACHE Seastar_RELEASE_DATE
+  PROPERTY
+  STRINGS 20221127)
+
 set (Seastar_API_LEVEL
   "7"
   CACHE
@@ -780,6 +790,15 @@ add_library (seastar
   src/websocket/server.cc
   )
 
+# Shared library soname  
+set_target_properties(seastar PROPERTIES
+  VERSION ${PROJECT_VERSION}.${Seastar_API_LEVEL}.${Seastar_RELEASE_DATE}
+  SOVERSION ${PROJECT_VERSION})
+
+# We disable _FORTIFY_SOURCE because it generates false positives with longjmp() (src/core/thread.cc)
+set_source_files_properties(src/core/thread.cc
+  PROPERTIES COMPILE_FLAGS -U_FORTIFY_SOURCE)
+
 add_library (Seastar::seastar ALIAS seastar)
 
 add_dependencies (seastar
@@ -1170,6 +1189,10 @@ if (Seastar_INSTALL OR Seastar_TESTING)
     src/testing/seastar_test.cc
     src/testing/test_runner.cc)
 
+  set_target_properties(seastar_testing PROPERTIES
+    VERSION ${PROJECT_VERSION}.${Seastar_API_LEVEL}.${Seastar_RELEASE_DATE}
+    SOVERSION ${PROJECT_VERSION})
+
   add_library (Seastar::seastar_testing ALIAS seastar_testing)
 
   target_compile_definitions (seastar_testing
@@ -1189,6 +1212,9 @@ if (Seastar_INSTALL OR Seastar_TESTING)
     include/seastar/testing/perf_tests.hh
     tests/perf/perf_tests.cc
     tests/perf/linux_perf_event.cc)
+  set_target_properties(seastar_perf_testing PROPERTIES
+    VERSION ${PROJECT_VERSION}.${Seastar_API_LEVEL}.${Seaster_RELEASE_DATE}
+    SOVERSION ${PROJECT_VERSION})
   add_library (Seastar::seastar_perf_testing ALIAS seastar_perf_testing)
   target_compile_definitions (seastar_perf_testing
     PRIVATE ${Seastar_PRIVATE_COMPILE_DEFINITIONS})