cmake: Support building nghttpx with systemd

CMakeLists.txt

@@ -66,6 +66,7 @@ if(OPENSSL_FOUND AND LIBEV_FOUND AND ZLIB_FOUND)
 else()
   set(ENABLE_APP_DEFAULT OFF)
 endif()
+find_package(Systemd 209)
 find_package(Jansson  2.5)
 set(ENABLE_HPACK_TOOLS_DEFAULT ${JANSSON_FOUND})
 # 2.0.8 is required because we use evconnlistener_set_error_cb()
@@ -193,6 +194,7 @@ endif()
 # libev (for src)
 set(HAVE_LIBEV      ${LIBEV_FOUND})
 set(HAVE_ZLIB       ${ZLIB_FOUND})
+set(HAVE_SYSTEMD    ${SYSTEMD_FOUND})
 set(HAVE_LIBEVENT_OPENSSL ${LIBEVENT_FOUND})
 if(LIBEVENT_FOUND)
   # Must both link the core and openssl libraries.
@@ -497,6 +499,7 @@ message(STATUS "summary of build options:
       Jansson:        ${HAVE_JANSSON} (LIBS='${JANSSON_LIBRARIES}')
       Jemalloc:       ${HAVE_JEMALLOC} (LIBS='${JEMALLOC_LIBRARIES}')
       Zlib:           ${HAVE_ZLIB} (LIBS='${ZLIB_LIBRARIES}')
+      Systemd:        ${HAVE_SYSTEMD} (LIBS='${SYSTEMD_LIBRARIES}')
       Boost::System:  ${Boost_SYSTEM_LIBRARY}
       Boost::Thread:  ${Boost_THREAD_LIBRARY}
     Third-party:

cmake/FindSystemd.cmake

@@ -0,0 +1,19 @@
+# - Try to find systemd
+# Once done this will define
+#  SYSTEMD_FOUND        - System has systemd
+#  SYSTEMD_INCLUDE_DIRS - The systemd include directories
+#  SYSTEMD_LIBRARIES    - The libraries needed to use systemd
+
+include(FeatureSummary)
+set_package_properties(Systemd PROPERTIES
+        URL "http://freedesktop.org/wiki/Software/systemd/"
+        DESCRIPTION "System and Service Manager")
+
+find_package(PkgConfig QUIET)
+pkg_check_modules(PC_SYSTEMD QUIET libsystemd)
+find_library(SYSTEMD_LIBRARIES NAMES systemd ${PC_SYSTEMD_LIBRARY_DIRS})
+find_path(SYSTEMD_INCLUDE_DIRS systemd/sd-login.h HINTS ${PC_SYSTEMD_INCLUDE_DIRS})
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(SYSTEMD DEFAULT_MSG SYSTEMD_INCLUDE_DIRS SYSTEMD_LIBRARIES)
+mark_as_advanced(SYSTEMD_INCLUDE_DIRS SYSTEMD_LIBRARIES)

src/CMakeLists.txt

@@ -126,6 +126,12 @@ if(ENABLE_APP)
     shrpx.cc
   )
 
+  if(HAVE_SYSTEMD)
+    target_link_libraries(nghttpx_static ${SYSTEMD_LIBRARIES})
+    target_compile_definitions(nghttpx_static PUBLIC HAVE_LIBSYSTEMD)
+    target_include_directories(nghttpx_static PUBLIC ${SYSTEMD_INCLUDE_DIRS})
+  endif()
+
   if(HAVE_MRUBY)
     target_link_libraries(nghttpx_static mruby-lib)
   endif()