meson: make wpipc optional and disabled by default

This is only intended to be used with specific embedded
applications. There is no good reason to use it on
a standard desktop environment.

lib/wpipc/meson.build

+if get_option('wpipc').disabled()
+  wpipc_dep = disabler()
+  subdir_done()
+endif
+
 wpipc_lib_sources = files(
   'utils.c',
   'protocol.c',

meson_options.txt

@@ -19,3 +19,5 @@ option('systemd-system-unit-dir',
 option('systemd-user-unit-dir',
        type : 'string',
        description : 'Directory for user systemd units')
+option('wpipc', type : 'feature', value : 'disabled',
+       description: 'Build the wpipc library and module-ipc')

modules/meson.build

@@ -177,13 +177,15 @@ shared_library(
   dependencies : [wp_dep, pipewire_dep, mathlib],
 )
 
-shared_library(
-  'wireplumber-module-ipc',
-  [
-    'module-ipc.c',
-  ],
-  c_args : [common_c_args, '-DG_LOG_DOMAIN="m-ipc"'],
-  install : true,
-  install_dir : wireplumber_module_dir,
-  dependencies : [wp_dep, pipewire_dep, wpipc_dep],
-)
+if wpipc_dep.found()
+  shared_library(
+    'wireplumber-module-ipc',
+    [
+      'module-ipc.c',
+    ],
+    c_args : [common_c_args, '-DG_LOG_DOMAIN="m-ipc"'],
+    install : true,
+    install_dir : wireplumber_module_dir,
+    dependencies : [wp_dep, pipewire_dep, wpipc_dep],
+  )
+endif

tests/examples/meson.build

@@ -9,13 +9,15 @@ executable('audiotestsrc-play',
   dependencies : [giounix_dep, wp_dep, pipewire_dep],
 )
 
-executable('wpipc-client',
-  'wpipc-client.c',
-  c_args : [
-    '-D_GNU_SOURCE',
-    '-DG_LOG_USE_STRUCTURED',
-    '-DG_LOG_DOMAIN="wpipc-client"',
-  ],
-  install: false,
-  dependencies : [wpipc_dep],
-)
+if wpipc_dep.found()
+  executable('wpipc-client',
+    'wpipc-client.c',
+    c_args : [
+      '-D_GNU_SOURCE',
+      '-DG_LOG_USE_STRUCTURED',
+      '-DG_LOG_DOMAIN="wpipc-client"',
+    ],
+    install: false,
+    dependencies : [wpipc_dep],
+  )
+endif

tests/meson.build

 subdir('wp')
 subdir('wplua')
-subdir('wpipc')
+subdir('wpipc', if_found: wpipc_dep)
 subdir('modules')
 subdir('examples')