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

Signed-off-by: Alexandre Julliard <julliard@winehq.org>

include/msvcrt: Make offsetof constant for compatibility with Mingw.
e7691288 · Alexandre Julliard · f402bcd0 · e7691288
Commit e7691288 authored Apr 22, 2019 by Alexandre Julliard
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stddef.h include/msvcrt/stddef.h +3 -1

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--- 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)