build: support enabled options when building seastar-module

before this change, when building seastar-module, we don't check for
the enabled features. so, for instance io uring backend is not enabled
even `Seastar_IO_URING` is set.

in this change we

* check for the enabled options,
* link against the related libraries, and
* add the required macro definitions

this should enable seastar-module to build with, for instance, io_uring
backend enabled. as `SEASTAR_HAVE_URING` enables this backend when
building `src/core/reactor_backend.cc`.

Fixes scylladb#2249
Signed-off-by: Kefu Chai <[email protected]>

src/CMakeLists.txt

@@ -96,7 +96,8 @@ target_compile_definitions (seastar-module
  SEASTAR_SCHEDULING_GROUPS_COUNT=${Seastar_SCHEDULING_GROUPS_COUNT}
  SEASTAR_COROUTINES_ENABLED
  PRIVATE
- SEASTAR_MODULE)
+ SEASTAR_MODULE
+ ${Seastar_PRIVATE_COMPILE_DEFINITIONS})
 target_compile_options (seastar-module
  PUBLIC
  -U_FORTIFY_SOURCE)
@@ -126,6 +127,18 @@ target_link_libraries (seastar-module
  yaml-cpp::yaml-cpp
  "$<BUILD_INTERFACE:Valgrind::valgrind>"
  Threads::Threads)
+if (Seastar_NUMA)
+ target_link_libraries (seastar-module
+ PRIVATE numactl::numactl)
+endif ()
+if (Seastar_HWLOC)
+ target_link_libraries (seastar-module
+ PRIVATE hwloc::hwloc)
+endif ()
+if (Seastar_IO_URING)
+ target_link_libraries (seastar-module
+ PRIVATE URING::uring)
+endif ()
 
 install (
  TARGETS seastar-module