From 439f6027934708fe7ca592aba8db78dbdd698614 Mon Sep 17 00:00:00 2001
From: Richard Stallman <rms@gnu.org>
Date: Tue, 19 Jan 1993 15:09:34 +0000
Subject: [PATCH] (build_compound_expr): Use non_lvalue if value is 0.

From-SVN: r3277
---
 gcc/c-typeck.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/gcc/c-typeck.c b/gcc/c-typeck.c
index 04134a06a26..d1f49a78804 100644
--- a/gcc/c-typeck.c
+++ b/gcc/c-typeck.c
@@ -3645,7 +3645,10 @@ build_compound_expr (list)
 	list = TREE_OPERAND (list, 0);
 #endif
 
-	return TREE_VALUE (list);
+      /* Don't let (0, 0) be null pointer constant.  */
+      if (integer_zerop (TREE_VALUE (list)))
+	return non_lvalue (TREE_VALUE (list));
+      return TREE_VALUE (list);
     }
 
   if (TREE_CHAIN (list) != 0 && TREE_CHAIN (TREE_CHAIN (list)) == 0)
-- 
2.30.2