From 31f19fbc6579a57186cc44e06e8494a34b9de057 Mon Sep 17 00:00:00 2001
From: Piotr Fusik <fox@scene.pl>
Date: Mon, 13 Feb 2017 21:10:21 +0100
Subject: [PATCH] Issue an error for duplicate global variables.

Previously it was an assembler error.
---
 src/cc65/compile.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/cc65/compile.c b/src/cc65/compile.c
index 85a2e9939..9cdeaf7e5 100644
--- a/src/cc65/compile.c
+++ b/src/cc65/compile.c
@@ -188,6 +188,10 @@ static void Parse (void)
                 if (CurTok.Tok == TOK_ASSIGN) {
 
                     /* This is a definition */
+                    if (SymIsDef (Entry)) {
+                        Error ("Global variable `%s' has already been defined",
+                               Entry->Name);
+                    }
                     Entry->Flags |= SC_DEF;
 
                     /* We cannot initialize types of unknown size, or