From 407dc10874de9496b783d3847791eb9544324ca6 Mon Sep 17 00:00:00 2001
From: erich <erich@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Sat, 1 Oct 1994 10:58:44 +0000
Subject: [PATCH] (shadow_label): Emit an error if the label is already
 declared at this label scope.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@8191 138bc75d-0d04-0410-961f-82ee72b054a4
---
 gcc/c-decl.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/gcc/c-decl.c b/gcc/c-decl.c
index 57796336188..fa16ad7c4a3 100644
--- a/gcc/c-decl.c
+++ b/gcc/c-decl.c
@@ -2440,6 +2440,21 @@ shadow_label (name)
 
   if (decl != 0)
     {
+      register tree dup;
+
+      /* Check to make sure that the label hasn't already been declared
+	 at this label scope */
+      for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
+	if (TREE_VALUE (dup) == decl)
+	  {
+	    error ("duplicate label declaration `%s'", 
+		   IDENTIFIER_POINTER (name));
+	    error_with_decl (TREE_VALUE (dup),
+			     "this is a previous declaration");
+	    /* Just use the previous declaration.  */
+	    return lookup_label (name);
+	  }
+
       shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
       IDENTIFIER_LABEL_VALUE (name) = decl = 0;
     }
-- 
2.11.4.GIT