From b67b8ddd38c5f974ef686c29fdf2798ac7f77faf Mon Sep 17 00:00:00 2001
From: acqn <acqn163@outlook.com>
Date: Sun, 19 Jul 2020 21:23:20 +0800
Subject: [PATCH] Disabled applying 'sizeof' to bit-fields.

---
 src/cc65/expr.c | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/src/cc65/expr.c b/src/cc65/expr.c
index b05083323..0b668f402 100644
--- a/src/cc65/expr.c
+++ b/src/cc65/expr.c
@@ -1898,14 +1898,19 @@ void hie10 (ExprDesc* Expr)
                 CodeMark Mark;
                 GetCodePos (&Mark);
                 hie10 (Expr);
-                /* If the expression is a literal string, release it, so it
-                ** won't be output as data if not used elsewhere.
-                */
-                if (ED_IsLocLiteral (Expr)) {
-                    ReleaseLiteral (Expr->LVal);
+                if (ED_IsBitField (Expr)) {
+                    Error ("Cannot apply 'sizeof' to bit-field");
+                    Size = 0;
+                } else {
+                    /* If the expression is a literal string, release it, so it
+                    ** won't be output as data if not used elsewhere.
+                    */
+                    if (ED_IsLocLiteral (Expr)) {
+                        ReleaseLiteral (Expr->LVal);
+                    }
+                    /* Calculate the size */
+                    Size = CheckedSizeOf (Expr->Type);
                 }
-                /* Calculate the size */
-                Size = CheckedSizeOf (Expr->Type);
                 /* Remove any generated code */
                 RemoveCode (&Mark);
             }