meson: Add options to configure whether to build daemon, tools and modules.

This adds three meson options to enable or disable building daemon, tools, and modules.

Building the daemon or tools depends on building the modules, and disabling modules without disabling
the other two will result in meson giving an appropriate error.

These new options will let users skip building and installing unneeded items when they are not needed,
e.g. when only using the C API in another application.

docs/rst/installing-wireplumber.rst

@@ -64,6 +64,28 @@ Additional options
   The default value is **auto**, which means that documentation will be built
   if **doxygen**, **sphinx** and **breathe** are found and skipped otherwise.
 
+.. option:: -Dmodules=[true|false]
+
+   Build the wireplumber modules.
+
+   The default value is **true**.
+
+.. option:: -Ddaemon=[true|false]
+
+   Build the session manager daemon.
+
+   The default value is **true**.
+
+   Requires **modules** option to be **true**.
+
+.. option:: -Dtools=[true|false]
+
+   Enable or disable building tools.
+
+   The default value is **true**.
+
+   Requires **modules** option to be **true**.
+
 .. option:: -Dsystem-lua=[enabled|disabled|auto]
 
    Force using lua from the system instead of the bundled one.

meson.build

@@ -33,6 +33,16 @@ add_project_arguments([
   ], language: 'c'
 )
 
+build_modules = get_option('modules')
+build_daemon = get_option('daemon')
+if build_daemon and not build_modules
+  error('\'modules\' option is required to be true when the \'daemon\' option is true')
+endif
+build_tools = get_option('tools')
+if build_tools and not build_modules
+  error('\'modules\' option is required to be true when the \'tools\' option is enabled')
+endif
+
 glib_dep = dependency('glib-2.0', version : glib_req_version)
 gobject_dep = dependency('gobject-2.0', version : glib_req_version)
 gmodule_dep = dependency('gmodule-2.0', version : glib_req_version)
@@ -44,8 +54,9 @@ mathlib = cc.find_library('m')
 threads_dep = dependency('threads')
 libintl_dep = dependency('intl')
 
-system_lua = get_option('system-lua')
+if build_modules
-if system_lua
+  system_lua = get_option('system-lua')
+  if system_lua
     if get_option('system-lua-version') != 'auto'
       lua_version_requested = get_option('system-lua-version')
       lua_dep = dependency('lua-' + lua_version_requested, required: false)
@@ -80,18 +91,21 @@ if system_lua
         error ('Could not find lua. Lua version 5.4 or 5.3 required')
       endif
     endif
-else
+  else
     lua_proj = subproject('lua', default_options: ['default_library=static'])
     lua_dep = lua_proj.get_variable('lua_dep')
+  endif
+  summary({'Lua version': lua_dep.version() + (system_lua ? ' (system)' : ' (built-in)')})
 endif
-summary({'Lua version': lua_dep.version() + (system_lua ? ' (system)' : ' (built-in)')})
 
-systemd = dependency('systemd', required: get_option('systemd'))
+if build_modules
-libsystemd_dep = dependency('libsystemd',required: get_option('systemd'))
+  systemd = dependency('systemd', required: get_option('systemd'))
-libelogind_dep = dependency('libelogind', required: get_option('elogind'))
+  libsystemd_dep = dependency('libsystemd',required: get_option('systemd'))
-summary({'systemd conf data': systemd.found(),
+  libelogind_dep = dependency('libelogind', required: get_option('elogind'))
+  summary({'systemd conf data': systemd.found(),
           'libsystemd': libsystemd_dep.found(),
           'libelogind': libelogind_dep.found()}, bool_yn: true)
+endif
 
 gnome = import('gnome')
 pkgconfig = import('pkgconfig')
@@ -121,7 +135,9 @@ add_project_arguments(cc.get_supported_arguments(common_flags), language: 'c')
 
 subdir('lib')
 subdir('docs')
-subdir('modules')
+if build_modules
+  subdir('modules')
+endif
 subdir('src')
 subdir('po')
 

meson_options.txt

@@ -2,6 +2,12 @@ option('introspection', type : 'feature', value : 'auto',
        description : 'Generate gobject-introspection bindings')
 option('doc', type : 'feature', value : 'auto',
        description: 'Enable documentation.')
+option('modules', type : 'boolean', value: 'true',
+       description : 'Build modules')
+option('daemon', type : 'boolean', value: 'true',
+       description : 'Build session manager daemon')
+option('tools', type : 'boolean', value: 'true',
+       description : 'Build CLI tools')
 option('system-lua', type : 'boolean', value : 'false',
        description : 'Use lua from the system instead of the bundled one')
 option('system-lua-version',

src/meson.build

@@ -1,20 +1,24 @@
-wp_sources = [
+if build_tools
-  'main.c',
+  subdir('tools')
-]
+endif
 
-install_subdir('config',
+if build_daemon
+  subdir('systemd')
+
+  install_subdir('config',
     install_dir: wireplumber_data_dir,
     strip_directory : true
-)
+  )
-install_subdir('scripts',
+  install_subdir('scripts',
     install_dir: wireplumber_data_dir,
     strip_directory : false
-)
+  )
 
-subdir('systemd')
+  wp_sources = [
-subdir('tools')
+    'main.c',
+  ]
 
-wireplumber = executable('wireplumber',
+  wireplumber = executable('wireplumber',
     wp_sources,
     c_args : [
       '-D_GNU_SOURCE',
@@ -23,4 +27,5 @@ wireplumber = executable('wireplumber',
     ],
     install: true,
     dependencies : [gobject_dep, gio_dep, wp_dep, pipewire_dep],
-)
+  )
+endif

tests/meson.build

@@ -60,6 +60,8 @@ if pipewire_confdatadir != ''
 endif
 
 subdir('wp')
-subdir('wplua')
+if build_modules
-subdir('modules')
+  subdir('wplua')
+  subdir('modules')
+endif
 subdir('examples')