opts: added docs

docs/markdown/Build-options.md

@@ -20,6 +20,9 @@ option('integer_opt', type : 'integer', min : 0, max : 5, value : 3) # Since 0.4
 option('free_array_opt', type : 'array', value : ['one', 'two'])  # Since 0.44.0
 option('array_opt', type : 'array', choices : ['one', 'two', 'three'], value : ['one', 'two'])
 option('some_feature', type : 'feature', value : 'enabled')  # Since 0.47.0
+option('long_desc', type : 'string', value : 'optval',
+       description : 'An option with a very long description' +
+                     'that does something in a specific context') # Since 0.55.0
 ```
 
 For built-in options, see [Built-in options][builtin_opts].

docs/markdown/snippets/options_string_concat.md

@@ -0,0 +1,14 @@
+## String concatenation in meson_options.txt
+
+It is now possible to use string concatenation (with the `+` opperator) in the
+meson_options.txt file. This allows splitting long option descriptions.
+
+```meson
+option(
+  'testoption',
+  type : 'string',
+  value : 'optval',
+  description : 'An option with a very long description' +
+                'that does something in a specific context'
+)
+```