From e76912880aca42f21db6445bf48ed24c4221af41 Mon Sep 17 00:00:00 2001
From: Alexandre Julliard <julliard@winehq.org>
Date: Mon, 22 Apr 2019 13:13:36 +0200
Subject: [PATCH] include/msvcrt: Make offsetof constant for compatibility with
 Mingw.

Signed-off-by: Alexandre Julliard <julliard@winehq.org>
---
 include/msvcrt/stddef.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/msvcrt/stddef.h b/include/msvcrt/stddef.h
index 0ceb65d91cd..cc38d569177 100644
--- a/include/msvcrt/stddef.h
+++ b/include/msvcrt/stddef.h
@@ -28,7 +28,9 @@
 #endif
 #endif
 
-#ifdef _WIN64
+#ifdef __GNUC__
+#define offsetof(s,m)       __builtin_offsetof(s,m)
+#elif defined(_WIN64)
 #define offsetof(s,m)       (size_t)((ptrdiff_t)&(((s*)NULL)->m))
 #else
 #define offsetof(s,m)       (size_t)&(((s*)NULL)->m)