rusticl: added

Initial code drop for Rusticl :)

Signed-off-by: Karol Herbst <kherbst@redhat.com>
Acked-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15439>

meson.build

@@ -27,7 +27,7 @@ project(
   ).stdout(),
   license : 'MIT',
   meson_version : '>= 0.53',
-  default_options : ['buildtype=debugoptimized', 'b_ndebug=if-release', 'c_std=c11', 'cpp_std=c++17']
+  default_options : ['buildtype=debugoptimized', 'b_ndebug=if-release', 'c_std=c11', 'cpp_std=c++17', 'rust_std=2021']
 )
 
 # In recent versions, meson can inject some extra arguments to get richer
@@ -953,6 +953,21 @@ else
   with_opencl_icd = false
 endif
 
+with_gallium_rusticl = get_option('gallium-rusticl')
+if with_gallium_rusticl
+  if not with_gallium
+    error('rusticl requires at least one gallium driver.')
+  endif
+
+  if meson.version().version_compare('< 0.61.4')
+    error('rusticl requires meson 0.61.4 or newer')
+  endif
+
+  add_languages('rust', required: true)
+
+  with_clc = true
+endif
+
 dep_clc = null_dep
 if with_libclc
   dep_clc = dependency('libclc')