meson: Link with libinotify on FreeBSD

make vm-build-freebsd fails with:

    ld: error: undefined symbol: inotify_init1
    >>> referenced by filemonitor-inotify.c:183 (../src/util/filemonitor-inotify.c:183)
    >>>               util_filemonitor-inotify.c.o:(qemu_file_monitor_new) in archive libqemuutil.a

On FreeBSD the inotify functions are defined in libinotify.so. Add it
to the dependencies.

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-ID: <20240206002344.12372-5-iii@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

meson.build

@@ -2384,6 +2384,22 @@ else
 endif
 config_host_data.set('CONFIG_ASAN_IFACE_FIBER', have_asan_fiber)
 
+have_inotify_init = cc.has_header_symbol('sys/inotify.h', 'inotify_init')
+have_inotify_init1 = cc.has_header_symbol('sys/inotify.h', 'inotify_init1')
+inotify = not_found
+if (have_inotify_init or have_inotify_init1) and host_os == 'freebsd'
+  # libinotify-kqueue
+  inotify = cc.find_library('inotify')
+  if have_inotify_init
+    have_inotify_init = inotify.found()
+  endif
+  if have_inotify_init1
+    have_inotify_init1 = inotify.found()
+  endif
+endif
+config_host_data.set('CONFIG_INOTIFY', have_inotify_init)
+config_host_data.set('CONFIG_INOTIFY1', have_inotify_init1)
+
 # has_header_symbol
 config_host_data.set('CONFIG_BLKZONED',
                      cc.has_header_symbol('linux/blkzoned.h', 'BLKOPENZONE'))
@@ -2400,10 +2416,6 @@ config_host_data.set('CONFIG_FIEMAP',
 config_host_data.set('CONFIG_GETRANDOM',
                      cc.has_function('getrandom') and
                      cc.has_header_symbol('sys/random.h', 'GRND_NONBLOCK'))
-config_host_data.set('CONFIG_INOTIFY',
-                     cc.has_header_symbol('sys/inotify.h', 'inotify_init'))
-config_host_data.set('CONFIG_INOTIFY1',
-                     cc.has_header_symbol('sys/inotify.h', 'inotify_init1'))
 config_host_data.set('CONFIG_PRCTL_PR_SET_TIMERSLACK',
                      cc.has_header_symbol('sys/prctl.h', 'PR_SET_TIMERSLACK'))
 config_host_data.set('CONFIG_RTNETLINK',
@@ -4407,6 +4419,9 @@ summary_info += {'libudev':           libudev}
 summary_info += {'FUSE lseek':        fuse_lseek.found()}
 summary_info += {'selinux':           selinux}
 summary_info += {'libdw':             libdw}
+if host_os == 'freebsd'
+  summary_info += {'libinotify-kqueue': inotify}
+endif
 summary(summary_info, bool_yn: true, section: 'Dependencies')
 
 if host_arch == 'unknown'

util/meson.build

@@ -104,7 +104,11 @@ if have_block
   util_ss.add(files('throttle.c'))
   util_ss.add(files('timed-average.c'))
   if config_host_data.get('CONFIG_INOTIFY1')
-    util_ss.add(files('filemonitor-inotify.c'))
+    freebsd_dep = []
+    if host_os == 'freebsd'
+      freebsd_dep = inotify
+    endif
+    util_ss.add(files('filemonitor-inotify.c'), freebsd_dep)
   else
     util_ss.add(files('filemonitor-stub.c'))
   endif