From fe44fe963fa2285096ba8c59d975feef474bd830 Mon Sep 17 00:00:00 2001
From: acqn <acqn163@outlook.com>
Date: Fri, 7 Aug 2020 17:40:40 +0800
Subject: [PATCH] Disallowed empty enums.

---
 src/cc65/declare.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/cc65/declare.c b/src/cc65/declare.c
index 636e0d61d..41f96c20a 100644
--- a/src/cc65/declare.c
+++ b/src/cc65/declare.c
@@ -549,8 +549,8 @@ static SymEntry* ParseEnumDecl (const char* Name)
     ident           Ident;
     long            MinConstant = 0;
     unsigned long   MaxConstant = 0;
-    const Type*     NewType     = type_int;  /* new enumerator type */
-    const Type*     MemberType  = type_int;  /* default enumerator type */
+    const Type*     NewType     = 0;        /* new member type */
+    const Type*     MemberType  = type_int; /* default member type */
 
     /* Accept forward definitions */
     if (CurTok.Tok != TOK_LCURLY) {
@@ -677,6 +677,11 @@ static SymEntry* ParseEnumDecl (const char* Name)
     }
     ConsumeRCurly ();
 
+    /* Check if there have been any members. Error if none */
+    if (NewType == 0) {
+        Error ("Empty enum is invalid");
+    }
+
     /* This evaluates the underlying type of the whole enum */
     MemberType = GetEnumeratorType (MinConstant, MaxConstant, 0);
     if (MemberType == 0) {