Merge pull request #1194 from ascent12/meson_feature

Build system changes

19 files changed, 385 insertions, 227 deletions

diff --git a/backend/meson.build b/backend/meson.build
index 52abe64d..dd1f4df3 100644
--- a/backend/meson.build
+++ b/backend/meson.build
@@ -1,3 +1,4 @@
+backend_parts = []
 backend_files = files(
 	'backend.c',
 	'drm/atomic.c',
@@ -44,28 +45,17 @@ else
 	backend_files += files('session/direct.c')
 endif
 
-if conf_data.get('WLR_HAS_SYSTEMD', false)
+if logind.found()
 	backend_files += files('session/logind.c')
-	backend_deps += systemd
+	backend_deps += logind
 endif
 
-if conf_data.get('WLR_HAS_X11_BACKEND', false)
-	backend_files += files(
-		'x11/backend.c',
-		'x11/input_device.c',
-		'x11/output.c',
-	)
-	backend_deps += xcb_xkb
-endif
-
-if conf_data.get('WLR_HAS_ELOGIND', false)
-	backend_files += files('session/logind.c')
-	backend_deps += elogind
-endif
+subdir('x11')
 
 lib_wlr_backend = static_library(
 	'wlr_backend',
 	backend_files,
 	include_directories: wlr_inc,
+	link_whole: backend_parts,
 	dependencies: backend_deps,
 )
diff --git a/backend/x11/meson.build b/backend/x11/meson.build
new file mode 100644
index 00000000..1164df1e
--- /dev/null
+++ b/backend/x11/meson.build
@@ -0,0 +1,44 @@
+x11_libs = []
+x11_required = [
+	'xcb',
+	'x11-xcb',
+]
+x11_optional = [
+	'xcb-xkb',
+]
+
+foreach lib : x11_required
+	dep = dependency(lib, required: get_option('x11-backend'))
+	if not dep.found()
+		subdir_done()
+	endif
+
+	x11_libs += dep
+endforeach
+
+foreach lib : x11_optional
+	dep = dependency(lib, required: get_option(lib))
+	if dep.found()
+		x11_libs += dep
+		conf_data.set('WLR_HAS_' + lib.underscorify().to_upper(), true)
+	endif
+endforeach
+
+lib_wlr_backend_x11 = static_library(
+	'wlr_backend_x11',
+	files(
+		'backend.c',
+		'input_device.c',
+		'output.c',
+	),
+	include_directories: wlr_inc,
+	dependencies: [
+		wayland_server,
+		pixman,
+		xkbcommon,
+		x11_libs,
+	],
+)
+
+backend_parts += lib_wlr_backend_x11
+conf_data.set('WLR_HAS_X11_BACKEND', true)
diff --git a/examples/meson.build b/examples/meson.build
index 25ad7566..0fb37a9e 100644
--- a/examples/meson.build
+++ b/examples/meson.build
@@ -1,80 +1,102 @@
 threads = dependency('threads')
 wayland_cursor = dependency('wayland-cursor')
-
 libpng = dependency('libpng', required: false)
-
 # These versions correspond to ffmpeg 4.0
 libavutil = dependency('libavutil', version: '>=56.14.100', required: false)
 libavcodec = dependency('libavcodec', version: '>=58.18.100', required: false)
 libavformat = dependency('libavformat', version: '>=58.12.100', required: false)
 
+# Small hack until https://github.com/mesonbuild/meson/pull/3386/ is merged
+foreach dep : ['libpng', 'libavutil', 'libavcodec', 'libavformat']
+	if not get_variable(dep).found()
+		set_variable(dep, disabler())
+	endif
+endforeach
+
 if not cc.has_header('libavutil/hwcontext_drm.h', dependencies: libavutil)
-    libavutil = disabler()
+	libavutil = disabler()
 endif
 
-executable('simple', 'simple.c', dependencies: wlroots)
-executable('pointer', 'pointer.c', dependencies: wlroots)
-executable('touch', 'touch.c', 'cat.c', dependencies: wlroots)
-executable('tablet', 'tablet.c', dependencies: wlroots)
-executable('rotation', 'rotation.c', 'cat.c', dependencies: wlroots)
-executable('multi-pointer', 'multi-pointer.c', dependencies: wlroots)
-executable('output-layout', 'output-layout.c', 'cat.c', dependencies: wlroots)
-
-executable(
-	'screenshot',
-	'screenshot.c',
-	dependencies: [wayland_client, wlr_protos, wlroots]
-)
-
-executable(
-	'idle',
-	'idle.c',
-	dependencies: [wayland_client, wlr_protos, wlroots, threads]
-)
-
-executable(
-	'idle-inhibit',
-	'idle-inhibit.c',
-	dependencies: [wayland_client, wlr_protos, wlroots, threads]
-)
-
-executable(
-	'layer-shell',
-	'layer-shell.c',
-	dependencies: [wayland_cursor, wayland_client, wlr_protos, wlroots]
-)
-
-executable(
-	'input-inhibitor',
-	'input-inhibitor.c',
-	dependencies: [wayland_cursor, wayland_client, wlr_protos, wlroots]
-)
+examples = {
+	'simple': {
+		'src': 'simple.c',
+		'dep': wlroots,
+	},
+	'pointer': {
+		'src': 'pointer.c',
+		'dep': wlroots,
+	},
+	'touch': {
+		'src': ['touch.c', 'cat.c'],
+		'dep': wlroots,
+	},
+	'tablet': {
+		'src': 'tablet.c',
+		'dep': wlroots,
+	},
+	'rotation': {
+		'src': ['rotation.c', 'cat.c'],
+		'dep': wlroots,
+	},
+	'multi-pointer': {
+		'src': 'multi-pointer.c',
+		'dep': wlroots,
+	},
+	'output-layout': {
+		'src': ['output-layout.c', 'cat.c'],
+		'dep': wlroots,
+	},
+	'screenshot': {
+		'src': 'screenshot.c',
+		'dep': [wayland_client, wlr_protos, wlroots],
+	},
+	'idle': {
+		'src': 'idle.c',
+		'dep': [wayland_client, wlr_protos, wlroots, threads],
+	},
+	'idle-inhibit': {
+		'src': 'idle-inhibit.c',
+		'dep': [wayland_client, wlr_protos, wlroots],
+	},
+	'layer-shell': {
+		'src': 'layer-shell.c',
+		'dep': [wayland_client, wayland_cursor, wlr_protos, wlroots],
+	},
+	'input-inhibitor': {
+		'src': 'input-inhibitor.c',
+		'dep': [wayland_client, wayland_cursor, wlr_protos, wlroots],
+	},
+	'gamma-control': {
+		'src': 'gamma-control.c',
+		'dep': [wayland_client, wayland_cursor, wlr_protos, wlroots],
+	},
+	'dmabuf-capture': {
+		'src': 'dmabuf-capture.c',
+		'dep': [
+			libavcodec,
+			libavformat,
+			libavutil,
+			threads,
+			wayland_client,
+			wlr_protos,
+			wlroots,
+		],
+	},
+	'screencopy': {
+		'src': 'screencopy.c',
+		'dep': [libpng, wayland_client, wlr_protos, wlroots],
+	},
+	'toplevel-decoration': {
+		'src': 'toplevel-decoration.c',
+		'dep': [wayland_client, wlr_protos, wlroots],
+	},
+}
 
-executable(
-	'gamma-control',
-	'gamma-control.c',
-	dependencies: [wayland_cursor, wayland_client, wlr_protos, wlroots]
-)
-
-if libavutil.found() and libavcodec.found() and libavformat.found()
+foreach name, info : examples
 	executable(
-		'dmabuf-capture',
-		'dmabuf-capture.c',
-		dependencies: [wayland_client, wlr_protos, libavutil, libavcodec,
-				libavformat, wlroots, threads ]
+		name,
+		info.get('src'),
+		dependencies: info.get('dep'),
+		build_by_default: get_option('examples'),
 	)
-endif
-
-if libpng.found()
-	executable(
-		'screencopy',
-		'screencopy.c',
-		dependencies: [wayland_client, wlr_protos, wlroots, libpng]
-	)
-endif
-
-executable(
-	'toplevel-decoration',
-	'toplevel-decoration.c',
-	dependencies: [wayland_client, wlr_protos, wlroots]
-)
+endforeach
diff --git a/glgen.sh b/glgen.sh
index 0356cf98..b27750e4 100755
--- a/glgen.sh
+++ b/glgen.sh
@@ -66,7 +66,6 @@ cat > $OUT_H << EOF
 
 #include <EGL/egl.h>
 #include <EGL/eglext.h>
-#include <EGL/eglmesaext.h>
 #include <GLES2/gl2.h>
 #include <GLES2/gl2ext.h>
 
diff --git a/include/wlr/backend/meson.build b/include/wlr/backend/meson.build
new file mode 100644
index 00000000..e005b854
--- /dev/null
+++ b/include/wlr/backend/meson.build
@@ -0,0 +1,16 @@
+install_headers(
+	'drm.h',
+	'headless.h',
+	'interface.h',
+	'libinput.h',
+	'multi.h',
+	'session.h',
+	'wayland.h',
+	subdir: 'wlr/backend',
+)
+
+if conf_data.get('WLR_HAS_X11_BACKEND', false)
+	install_headers('x11.h', subdir: 'wlr/backend')
+endif
+
+subdir('session')
diff --git a/include/wlr/backend/session/meson.build b/include/wlr/backend/session/meson.build
new file mode 100644
index 00000000..21b5a96b
--- /dev/null
+++ b/include/wlr/backend/session/meson.build
@@ -0,0 +1 @@
+install_headers('interface.h', subdir: 'wlr/backend/session')
diff --git a/include/wlr/config.h.in b/include/wlr/config.h.in
new file mode 100644
index 00000000..750ad3b7
--- /dev/null
+++ b/include/wlr/config.h.in
@@ -0,0 +1,19 @@
+#ifndef WLR_CONFIG_H
+#define WLR_CONFIG_H
+
+#mesondefine WLR_HAS_LIBCAP
+
+#mesondefine WLR_HAS_SYSTEMD
+#mesondefine WLR_HAS_ELOGIND
+
+#mesondefine WLR_HAS_X11_BACKEND
+
+#mesondefine WLR_HAS_XWAYLAND
+
+#mesondefine WLR_HAS_XCB_ERRORS
+#mesondefine WLR_HAS_XCB_ICCCM
+#mesondefine WLR_HAS_XCB_XKB
+
+#mesondefine WLR_HAS_POSIX_FALLOCATE
+
+#endif
diff --git a/include/wlr/interfaces/meson.build b/include/wlr/interfaces/meson.build
new file mode 100644
index 00000000..207896b5
--- /dev/null
+++ b/include/wlr/interfaces/meson.build
@@ -0,0 +1,10 @@
+install_headers(
+	'wlr_input_device.h',
+	'wlr_keyboard.h',
+	'wlr_output.h',
+	'wlr_pointer.h',
+	'wlr_tablet_pad.h',
+	'wlr_tablet_tool.h',
+	'wlr_touch.h',
+	subdir: 'wlr/interfaces',
+)
diff --git a/include/wlr/meson.build b/include/wlr/meson.build
index 6259c311..43b5aec9 100644
--- a/include/wlr/meson.build
+++ b/include/wlr/meson.build
@@ -4,11 +4,23 @@ version_data.set_quoted('WLR_VERSION_STR',   meson.project_version())
 version_data.set('WLR_VERSION_MAJOR',        version_array[0])
 version_data.set('WLR_VERSION_MINOR',        version_array[1])
 version_data.set('WLR_VERSION_MICRO',        version_array[2])
-version_data.set('WLR_VERSION_NUM',          '(WLR_VERSION_MAJOR << 16) | (WLR_VERSION_MINOR << 8) | WLR_VERSION_MICRO')
 version_data.set('WLR_VERSION_API_CURRENT',  so_version[0])
 version_data.set('WLR_VERSION_API_REVISION', so_version[1])
 version_data.set('WLR_VERSION_API_AGE',      so_version[2])
 
-wlr_inc_dest = join_paths(get_option('includedir'), 'wlr')
-configure_file(output: 'config.h',  install_dir: wlr_inc_dest, configuration: conf_data)
-configure_file(output: 'version.h', install_dir: wlr_inc_dest, configuration: version_data)
+install_headers(
+	configure_file(input: 'config.h.in', output: 'config.h',configuration: conf_data),
+	configure_file(input: 'version.h.in', output: 'version.h', configuration: version_data),
+	'backend.h',
+	'xcursor.h',
+	subdir: 'wlr'
+)
+if conf_data.get('WLR_HAS_XWAYLAND', false)
+	install_headers('xwayland.h', subdir: 'wlr')
+endif
+
+subdir('backend')
+subdir('interfaces')
+subdir('render')
+subdir('types')
+subdir('util')
diff --git a/include/wlr/render/meson.build b/include/wlr/render/meson.build
new file mode 100644
index 00000000..05127bb7
--- /dev/null
+++ b/include/wlr/render/meson.build
@@ -0,0 +1,9 @@
+install_headers(
+	'dmabuf.h',
+	'egl.h',
+	'gles2.h',
+	'interface.h',
+	'wlr_renderer.h',
+	'wlr_texture.h',
+	subdir: 'wlr/render'
+)
diff --git a/include/wlr/types/meson.build b/include/wlr/types/meson.build
new file mode 100644
index 00000000..8c81cb0e
--- /dev/null
+++ b/include/wlr/types/meson.build
@@ -0,0 +1,42 @@
+install_headers(
+	'wlr_box.h',
+	'wlr_buffer.h',
+	'wlr_compositor.h',
+	'wlr_cursor.h',
+	'wlr_data_device.h',
+	'wlr_export_dmabuf_v1.h',
+	'wlr_gamma_control.h',
+	'wlr_gamma_control_v1.h',
+	'wlr_idle.h',
+	'wlr_idle_inhibit_v1.h',
+	'wlr_input_device.h',
+	'wlr_input_inhibitor.h',
+	'wlr_keyboard.h',
+	'wlr_layer_shell.h',
+	'wlr_linux_dmabuf_v1.h',
+	'wlr_list.h',
+	'wlr_matrix.h',
+	'wlr_output.h',
+	'wlr_output_damage.h',
+	'wlr_output_layout.h',
+	'wlr_pointer.h',
+	'wlr_primary_selection.h',
+	'wlr_region.h',
+	'wlr_screencopy_v1.h',
+	'wlr_screenshooter.h',
+	'wlr_seat.h',
+	'wlr_server_decoration.h',
+	'wlr_surface.h',
+	'wlr_tablet_pad.h',
+	'wlr_tablet_tool.h',
+	'wlr_tablet_v2.h',
+	'wlr_touch.h',
+	'wlr_virtual_keyboard_v1.h',
+	'wlr_wl_shell.h',
+	'wlr_xcursor_manager.h',
+	'wlr_xdg_decoration_v1.h',
+	'wlr_xdg_output.h',
+	'wlr_xdg_shell.h',
+	'wlr_xdg_shell_v6.h',
+	subdir: 'wlr/types',
+)
diff --git a/include/wlr/util/meson.build b/include/wlr/util/meson.build
new file mode 100644
index 00000000..ee72cbd6
--- /dev/null
+++ b/include/wlr/util/meson.build
@@ -0,0 +1,6 @@
+install_headers(
+	'edges.h',
+	'log.h',
+	'region.h',
+	subdir: 'wlr/util',
+)
diff --git a/include/wlr/version.h.in b/include/wlr/version.h.in
new file mode 100644
index 00000000..cdc0fd75
--- /dev/null
+++ b/include/wlr/version.h.in
@@ -0,0 +1,16 @@
+#ifndef WLR_VERSION_H
+#define WLR_VERSION_H
+
+#mesondefine WLR_VERSION_STR
+
+#mesondefine WLR_VERSION_MAJOR
+#mesondefine WLR_VERSION_MINOR
+#mesondefine WLR_VERSION_MICRO
+
+#define WLR_VERSION_NUM ((WLR_VERSION_MAJOR << 16) | (WLR_VERSION_MINOR << 8) | WLR_VERSION_MICRO)
+
+#mesondefine WLR_VERSION_API_CURRENT
+#mesondefine WLR_VERSION_API_REVISION
+#mesondefine WLR_VERSION_API_AGE
+
+#endif
diff --git a/meson.build b/meson.build
index 655eb52d..8458a66c 100644
--- a/meson.build
+++ b/meson.build
@@ -3,7 +3,7 @@ project(
 	'c',
 	version: '0.0.1',
 	license: 'MIT',
-	meson_version: '>=0.44.0',
+	meson_version: '>=0.47.0',
 	default_options: [
 		'c_std=c11',
 		'warning_level=2',
@@ -18,15 +18,7 @@ so_version = ['0', '0', '0']
 
 add_project_arguments('-Wno-unused-parameter', language: 'c')
 add_project_arguments(
-	'-DWLR_SRC_DIR="@0@"'.format(meson.source_root()),
-	language: 'c',
-)
-add_project_arguments(
-	'-I@0@'.format(meson.build_root()),
-	language: 'c',
-)
-add_project_link_arguments(
-	'-Wl,-rpath,@0@'.format(meson.build_root()),
+	'-DWLR_SRC_DIR="@0@"'.format(meson.current_source_dir()),
 	language: 'c',
 )
 add_project_arguments(
@@ -36,7 +28,7 @@ add_project_arguments(
 
 conf_data = configuration_data()
 
-wlr_inc = include_directories('include')
+wlr_inc = include_directories('.', 'include')
 
 cc = meson.get_compiler('c')
 
@@ -62,90 +54,37 @@ libinput       = dependency('libinput', version: '>=1.7.0')
 xkbcommon      = dependency('xkbcommon')
 udev           = dependency('libudev')
 pixman         = dependency('pixman-1')
-libcap         = dependency('libcap', required: get_option('enable-libcap') == 'true')
-systemd        = dependency('libsystemd', required: get_option('enable-systemd') == 'true')
-elogind        = dependency('libelogind', required: get_option('enable-elogind') == 'true')
+libcap         = dependency('libcap', required: get_option('libcap'))
+logind         = dependency('lib' + get_option('logind-provider'), required: get_option('logind'))
 math           = cc.find_library('m', required: false)
 
-exclude_headers = []
 wlr_parts = []
 wlr_deps = []
 
-if libcap.found() and get_option('enable-libcap') != 'false'
+if libcap.found()
 	conf_data.set('WLR_HAS_LIBCAP', true)
 	wlr_deps += libcap
 endif
 
-if systemd.found() and get_option('enable-systemd') != 'false'
-	conf_data.set('WLR_HAS_SYSTEMD', true)
-	wlr_deps += systemd
-endif
-
-if elogind.found() and get_option('enable-elogind') != 'false'
-	conf_data.set('WLR_HAS_ELOGIND', true)
-endif
-
-if get_option('enable-x11_backend') or get_option('enable-xwayland')
-	xcb            = dependency('xcb')
-	xcb_composite  = dependency('xcb-composite')
-	xcb_xfixes     = dependency('xcb-xfixes')
-	xcb_image      = dependency('xcb-image')
-	xcb_render     = dependency('xcb-render')
-	x11_xcb        = dependency('x11-xcb')
-
-	xcb_icccm      = dependency('xcb-icccm', required: false)
-	xcb_xkb        = dependency('xcb-xkb', required: false)
-	xcb_errors     = dependency('xcb-errors', required: get_option('enable-xcb_errors') == 'true')
-
-	if xcb_icccm.found()
-		conf_data.set('WLR_HAS_XCB_ICCCM', true)
-	endif
-
-	if xcb_xkb.found()
-		conf_data.set('WLR_HAS_XCB_XKB', true)
-	endif
-
-	if xcb_errors.found() and get_option('enable-xcb_errors') != 'false'
-		conf_data.set('WLR_HAS_XCB_ERRORS', true)
-	endif
-
-	wlr_deps += [
-		xcb,
-		xcb_composite,
-		x11_xcb,
-	]
-else
-	add_project_arguments('-DMESA_EGL_NO_X11_HEADERS', language: 'c')
-endif
-
-if get_option('enable-x11_backend')
-	conf_data.set('WLR_HAS_X11_BACKEND', true)
-endif
-
-if get_option('enable-xwayland')
-	subdir('xwayland')
-	wlr_parts += [lib_wlr_xwayland]
-	conf_data.set('WLR_HAS_XWAYLAND', true)
-else
-	exclude_headers += 'xwayland.h'
+if logind.found()
+	conf_data.set('WLR_HAS_' + get_option('logind-provider').to_upper(), true)
+	wlr_deps += logind
 endif
 
 if cc.has_header_symbol('fcntl.h', 'posix_fallocate', prefix: '#define _POSIX_C_SOURCE 200112L')
 	conf_data.set('WLR_HAS_POSIX_FALLOCATE', true)
 endif
 
-includedir = get_option('includedir')
-exclude_headers += 'meson.build'
-install_subdir('include/wlr', install_dir: includedir, exclude_files: exclude_headers)
-
-
-subdir('include')
 subdir('protocol')
 subdir('render')
+
 subdir('backend')
 subdir('types')
 subdir('util')
 subdir('xcursor')
+subdir('xwayland')
+
+subdir('include')
 
 wlr_parts += [
 	lib_wl_protos,
@@ -182,6 +121,7 @@ lib_wlr = library(
 	include_directories: wlr_inc,
 	install: true,
 	link_args : symbols_flag,
+	link_depends: symbols_file,
 )
 
 wlroots = declare_dependency(
@@ -190,7 +130,6 @@ wlroots = declare_dependency(
 	include_directories: wlr_inc,
 )
 
-
 summary = [
 	'',
 	'----------------',
@@ -208,14 +147,8 @@ summary = [
 ]
 message('\n'.join(summary))
 
-
-if get_option('enable-rootston')
-	subdir('rootston')
-endif
-
-if get_option('enable-examples')
-	subdir('examples')
-endif
+subdir('examples')
+subdir('rootston')
 
 pkgconfig = import('pkgconfig')
 pkgconfig.generate(
@@ -230,26 +163,31 @@ git = find_program('git', required: false)
 if git.found()
 	all_files = run_command(
 		git,
-		['--git-dir=@0@/.git'.format(meson.current_source_dir()),
-		 'ls-files',
-		 ':/*.[ch]'])
+		'--git-dir=@0@/.git'.format(meson.current_source_dir()),
+		'ls-files',
+		':/*.[ch]',
+	)
 	all_files = files(all_files.stdout().split())
 
 	etags = find_program('etags', required: false)
 	if etags.found() and all_files.length() > 0
-		custom_target('etags',
+		custom_target(
+			'etags',
 			build_by_default: true,
 			input: all_files,
 			output: 'TAGS',
-			command: [etags.path(), '-o', 'TAGS'] + all_files)
+			command: [etags, '-o', '@OUTPUT@', '@INPUT@'],
+		)
 	endif
 
 	ctags = find_program('ctags', required: false)
 	if ctags.found() and all_files.length() > 0
-		custom_target('ctags',
+		custom_target(
+			'ctags',
 			build_by_default: true,
 			input: all_files,
 			output: 'tags',
-			command: [ctags.path(), '-f', 'tags'] + all_files)
+			command: [ctags, '-f', '@OUTPUT@', '@INPUT@'],
+		)
 	endif
 endif
diff --git a/meson_options.txt b/meson_options.txt
index e474b8aa..360c6f6a 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -1,8 +1,10 @@
-option('enable-libcap', type: 'combo', choices: ['auto', 'true', 'false'], value: 'auto', description: 'Enable support for capabilities')
-option('enable-systemd', type: 'combo', choices: ['auto', 'true', 'false'], value: 'auto', description: 'Enable support for logind')
-option('enable-elogind', type: 'combo', choices: ['auto', 'true', 'false'], value: 'auto', description: 'Enable support for logind')
-option('enable-xcb_errors', type: 'combo', choices: ['auto', 'true', 'false'], value: 'auto', description: 'Use xcb-errors util library')
-option('enable-xwayland', type: 'boolean', value: true, description: 'Enable support X11 applications')
-option('enable-x11_backend', type: 'boolean', value: true, description: 'Enable X11 backend')
-option('enable-rootston', type: 'boolean', value: true, description: 'Build the rootston example compositor')
-option('enable-examples', type: 'boolean', value: true, description: 'Build example applications')
+option('libcap', type: 'feature', value: 'auto', description: 'Enable support for rootless session via capabilities (cap_sys_admin)')
+option('logind', type: 'feature', value: 'auto', description: 'Enable support for rootless session via logind')
+option('logind-provider', type: 'combo', choices: ['systemd', 'elogind'], value: 'systemd', description: 'Provider of logind support library')
+option('xcb-errors', type: 'feature', value: 'auto', description: 'Use xcb-errors util library')
+option('xcb-icccm', type: 'feature', value: 'auto', description: 'Use xcb-icccm util library')
+option('xcb-xkb', type: 'feature', value: 'auto', description: 'Use xcb-xkb util library')
+option('xwayland', type: 'feature', value: 'auto', description: 'Enable support for X11 applications')
+option('x11-backend', type: 'feature', value: 'auto', description: 'Enable X11 backend')
+option('rootston', type: 'boolean', value: true, description: 'Build the rootston example compositor')
+option('examples', type: 'boolean', value: true, description: 'Build example applications')
diff --git a/protocol/meson.build b/protocol/meson.build
index 73a3156a..2d2a73ed 100644
--- a/protocol/meson.build
+++ b/protocol/meson.build
@@ -1,32 +1,15 @@
 wl_protocol_dir = wayland_protos.get_pkgconfig_variable('pkgdatadir')
 
-wayland_scanner = find_program('wayland-scanner')
-
-wayland_scanner_server = generator(
-	wayland_scanner,
-	output: '@BASENAME@-protocol.h',
-	arguments: ['server-header', '@INPUT@', '@OUTPUT@'],
-)
-
-# should check wayland_scanner's version, but it is hard to get
-if wayland_server.version().version_compare('>=1.14.91')
-	code_type = 'private-code'
+wayland_scanner_dep = dependency('wayland-scanner', required: false, native: true)
+if wayland_scanner_dep.found()
+	wayland_scanner = find_program(
+		wayland_scanner_dep.get_pkgconfig_variable('wayland_scanner'),
+		native: true,
+	)
 else
-	code_type = 'code'
+	wayland_scanner = find_program('wayland-scanner', native: true)
 endif
 
-wayland_scanner_code = generator(
-	wayland_scanner,
-	output: '@BASENAME@-protocol.c',
-	arguments: [code_type, '@INPUT@', '@OUTPUT@'],
-)
-
-wayland_scanner_client = generator(
-	wayland_scanner,
-	output: '@BASENAME@-client-protocol.h',
-	arguments: ['client-header', '@INPUT@', '@OUTPUT@'],
-)
-
 protocols = [
 	[wl_protocol_dir, 'stable/xdg-shell/xdg-shell.xml'],
 	[wl_protocol_dir, 'unstable/idle-inhibit/idle-inhibit-unstable-v1.xml'],
@@ -67,17 +50,35 @@ wl_protos_headers = []
 
 foreach p : protocols
 	xml = join_paths(p)
-	wl_protos_src += wayland_scanner_code.process(xml)
-	wl_protos_headers += wayland_scanner_server.process(xml)
+	wl_protos_src += custom_target(
+		xml.underscorify() + '_server_c',
+		input: xml,
+		output: '@BASENAME@-protocol.c',
+		command: [wayland_scanner, 'private-code', '@INPUT@', '@OUTPUT@'],
+	)
+	wl_protos_headers += custom_target(
+		xml.underscorify() + '_server_h',
+		input: xml,
+		output: '@BASENAME@-protocol.h',
+		command: [wayland_scanner, 'server-header', '@INPUT@', '@OUTPUT@'],
+	)
 endforeach
 
 foreach p : client_protocols
 	xml = join_paths(p)
-	wl_protos_headers += wayland_scanner_client.process(xml)
+	wl_protos_headers += custom_target(
+		xml.underscorify() + '_client_h',
+		input: xml,
+		output: '@BASENAME@-client-protocol.h',
+		command: [wayland_scanner, 'client-header', '@INPUT@', '@OUTPUT@'],
+	)
 endforeach
 
-lib_wl_protos = static_library('wl_protos', wl_protos_src + wl_protos_headers,
-	dependencies: [wayland_client]) # for the include directory
+lib_wl_protos = static_library(
+	'wl_protos',
+	wl_protos_src + wl_protos_headers,
+	dependencies: wayland_client.partial_dependency(includes: true),
+)
 
 wlr_protos = declare_dependency(
 	link_with: lib_wl_protos,
diff --git a/render/meson.build b/render/meson.build
index 4b90c229..c5401d22 100644
--- a/render/meson.build
+++ b/render/meson.build
@@ -1,6 +1,7 @@
 glgen = find_program('../glgen.sh')
 
-glapi = custom_target('glapi',
+glapi = custom_target(
+	'glapi',
 	input: 'glapi.txt',
 	output: ['@BASENAME@.c', '@BASENAME@.h'],
 	command: [glgen, '@INPUT@', '@OUTPUT0@', '@OUTPUT1@'],
@@ -19,8 +20,7 @@ lib_wlr_render = static_library(
 		'wlr_renderer.c',
 		'wlr_texture.c',
 	),
-	glapi[0],
-	glapi[1],
+	glapi,
 	include_directories: wlr_inc,
 	dependencies: [egl, glesv2, pixman, wayland_server],
 )
diff --git a/rootston/meson.build b/rootston/meson.build
index 8ab872b5..9d1decce 100644
--- a/rootston/meson.build
+++ b/rootston/meson.build
@@ -11,12 +11,17 @@ sources = [
 	'seat.c',
 	'virtual_keyboard.c',
 	'wl_shell.c',
-	'xdg_shell_v6.c',
 	'xdg_shell.c',
+	'xdg_shell_v6.c',
 ]
-if get_option('enable-xwayland')
-	sources += ['xwayland.c']
+
+if conf_data.get('WLR_HAS_XWAYLAND', false)
+	sources += 'xwayland.c'
 endif
+
 executable(
-	'rootston', sources, dependencies: [wlroots, wlr_protos, pixman]
+	'rootston',
+	sources,
+	dependencies: [wlroots, wlr_protos, pixman],
+	build_by_default: get_option('rootston'),
 )
diff --git a/xwayland/meson.build b/xwayland/meson.build
index ec486f58..0bd88924 100644
--- a/xwayland/meson.build
+++ b/xwayland/meson.build
@@ -1,3 +1,32 @@
+xwayland_libs = []
+xwayland_required = [
+	'xcb',
+	'xcb-composite',
+	'xcb-render',
+	'xcb-xfixes',
+]
+xwayland_optional = [
+	'xcb-errors',
+	'xcb-icccm',
+]
+
+foreach lib : xwayland_required
+	dep = dependency(lib, required: get_option('xwayland'))
+	if not dep.found()
+		subdir_done()
+	endif
+
+	xwayland_libs += dep
+endforeach
+
+foreach lib : xwayland_optional
+	dep = dependency(lib, required: get_option(lib))
+	if dep.found()
+		xwayland_libs += dep
+		conf_data.set('WLR_HAS_' + lib.underscorify().to_upper(), true)
+	endif
+endforeach
+
 lib_wlr_xwayland = static_library(
 	'wlr_xwayland',
 	files(
@@ -12,14 +41,11 @@ lib_wlr_xwayland = static_library(
 	include_directories: wlr_inc,
 	dependencies: [
 		wayland_server,
-		xcb,
-		xcb_composite,
-		xcb_xfixes,
-		xcb_image,
-		xcb_render,
-		xcb_icccm,
-		xcb_errors,
+		xwayland_libs,
 		xkbcommon,
 		pixman,
 	],
 )
+
+wlr_parts += lib_wlr_xwayland
+conf_data.set('WLR_HAS_XWAYLAND', true)