From 130031168de44e38e84000f279951ef70a99cb66 Mon Sep 17 00:00:00 2001
From: Samuel Iglesias Gonsalvez <siglesias@igalia.com>
Date: Wed, 2 Sep 2015 15:58:01 +0200
Subject: [PATCH] glsl: layout qualifier can appear more than once since OpenGL
 4.20
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Also if GL_ARB_shading_language_420pack extension is enabled.

Signed-off-by: Samuel Iglesias Gonsalvez <siglesias@igalia.com>
Reviewed-by: Kristian Høgsberg <krh@bitplanet.net>
---
 src/glsl/glsl_parser.yy | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/glsl/glsl_parser.yy b/src/glsl/glsl_parser.yy
index 59e4527b238..4dd5384dac8 100644
--- a/src/glsl/glsl_parser.yy
+++ b/src/glsl/glsl_parser.yy
@@ -2595,9 +2595,15 @@ interface_block:
    {
       $$ = $1;
    }
-   | layout_qualifier basic_interface_block
+   | layout_qualifier interface_block
    {
-      ast_interface_block *block = $2;
+      ast_interface_block *block = (ast_interface_block *) $2;
+
+      if (!state->has_420pack() && block->layout.has_layout()) {
+         _mesa_glsl_error(&@1, state, "duplicate layout(...) qualifiers");
+         YYERROR;
+      }
+
       if (!block->layout.merge_qualifier(& @1, state, $1)) {
          YYERROR;
       }
-- 
2.30.2