meson: Provide options to disable test/docs

It can be desirable to disable the compilation and processing of both
the test suite and documentation for use cases such as packaging to an
embedded target.

Provide a new meson_options.txt file to allow disabling either or both
of the tests and documentation components of libcamera.

These options can be provided at the initial configuration time, for
example:

  meson build -Dtests=false -Ddocumentation=false

or by reconfiguring an existing build tree:

  cd build
  meson configure -Ddocumentation=false
  meson configure -Dtests=false

Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

meson.build

@@ -27,9 +27,15 @@ libcamera_includes = include_directories('include')
 
 subdir('include')
 subdir('src')
-subdir('test')
 subdir('utils')
-subdir('Documentation')
+
+if get_option('tests')
+	subdir('test')
+endif
+
+if get_option('documentation')
+	subdir('Documentation')
+endif
 
 pkg_mod = import('pkgconfig')
 pkg_mod.generate(libraries : libcamera,

meson_options.txt

@@ -0,0 +1,2 @@
+option('tests', type : 'boolean')
+option('documentation', type : 'boolean')