Alexandre Julliard : include/msvcrt: Make offsetof constant for compatibility with Mingw.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: e76912880aca42f21db6445bf48ed24c4221af41
URL:    https://source.winehq.org/git/wine.git/?a=commit;h=e76912880aca42f21db6445bf...

Author: Alexandre Julliard 
Date:   Mon Apr 22 13:13:36 2019 +0200

include/msvcrt: Make offsetof constant for compatibility with Mingw.

Signed-off-by: Alexandre Julliard

---

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 0ceb65d..cc38d56 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)