Zebediah Figura : vkd3d-shader: Treat undefined identifiers as equal to 0 in #if directives.

[Alexandre Julliard]

Module: vkd3d
Branch: master
Commit: d4929660c3247c2198d4f6f641813256638307a2
URL:    https://source.winehq.org/git/vkd3d.git/?a=commit;h=d4929660c3247c2198d4f6f641813256638307a2

Author: Zebediah Figura <zfigura at codeweavers.com>
Date:   Tue Jan 19 11:18:17 2021 -0600

vkd3d-shader: Treat undefined identifiers as equal to 0 in #if directives.

Signed-off-by: Zebediah Figura <zfigura at codeweavers.com>
Signed-off-by: Henri Verbeet <hverbeet at codeweavers.com>
Signed-off-by: Matteo Bruni <mbruni at codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard at winehq.org>

---

 libs/vkd3d-shader/preproc.y | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libs/vkd3d-shader/preproc.y b/libs/vkd3d-shader/preproc.y
index f9047c9..008d01e 100644
--- a/libs/vkd3d-shader/preproc.y
+++ b/libs/vkd3d-shader/preproc.y
@@ -588,6 +588,11 @@ expr
             $$ = preproc_parse_integer($1);
             vkd3d_free($1);
         }
+    | T_IDENTIFIER
+        {
+            $$ = 0;
+            vkd3d_free($1);
+        }
     | T_DEFINED T_IDENTIFIER
         {
             $$ = !!preproc_find_macro(ctx, $2);