meson: Add option to control building wayland-scanner

Wayland requires a binary, wayland-scanner, to be run during the build
process. For any configuration other than native builds (including
cross compiling and even 32-bit x86 builds on an x86-64 build machine)
Wayland's build process builds and uses its own wayland-scanner.

For any builds using a cross file, wayland-scanner is built for the host
machine and therefore cannot be executed during the build of the Wayland
libraries. Instead builds using a cross file must execute the build
machine's wayland-scanner (typically /usr/bin/wayland-scanner).

As such, to build Wayland's libraries for a non-native ABI a package
manager must build and install /usr/bin/wayland-scanner first. But then
the build for the native ABI then rebuilds wayland-scanner itself and
doesn't use the system's, and worse, wants to install its own, which
conflicts with the /usr/bin/wayland-scanner already installed!

So, add the -Dscanner=... option to control whether to install
wayland-scanner.

Signed-off-by: Matt Turner <mattst88@gmail.com>

1 files changed, 14 insertions, 13 deletions

diff --git a/meson.build b/meson.build
index 26b084f..540dee8 100644
--- a/meson.build
+++ b/meson.build
@@ -84,19 +84,20 @@ if get_option('libraries')
 	subdir('cursor')
 	subdir('egl')
 	subdir('tests')
+	if get_option('documentation')
+		subdir('doc')
+	endif
 endif
 
-if get_option('documentation')
-	subdir('doc')
-endif
-
-install_data([
-	'wayland-scanner.mk',
-	'protocol/wayland.xml',
-	'protocol/wayland.dtd',
-])
+if get_option('scanner')
+	install_data([
+		'wayland-scanner.mk',
+		'protocol/wayland.xml',
+		'protocol/wayland.dtd',
+	])
 
-install_data(
-	[ 'wayland-scanner.m4' ],
-	install_dir: join_paths(get_option('prefix'), get_option('datadir'), 'aclocal'),
-)
+	install_data(
+		[ 'wayland-scanner.m4' ],
+		install_dir: join_paths(get_option('prefix'), get_option('datadir'), 'aclocal'),
+	)
+endif