Meson: ensure variable defined
A gallium driver is undefined if passing -Dgallium-drivers=''
Fixes: e0b037d6979b2 ("meson: Build SWR driver")
Signed-off-by: Dylan Baker <dylan.c.baker@intel.com>
Acked-by: Jordan Justen <jordan.l.justen@intel.com>
Acked-by: Jason Ekstrand <jason.ekstrand@intel.com>
diff --git a/meson.build b/meson.build
index 1a1d3fd..77e4e89 100644
--- a/meson.build
+++ b/meson.build
@@ -125,6 +125,7 @@
with_gallium_i915 = false
with_gallium_svga = false
with_gallium_virgl = false
+with_gallium_swr = false
_drivers = get_option('gallium-drivers')
if _drivers == 'auto'
if not ['darwin', 'windows'].contains(host_machine.system())