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include: types: Use __builtin_offsetof when supported
author
Alex Richardson
<Alexander.Richardson@cl.cam.ac.uk>
Mon, 12 Jul 2021 12:39:59 +0000
(13:39 +0100)
committer
Anup Patel
<anup@brainfault.org>
Sat, 17 Jul 2021 11:10:07 +0000
(16:40 +0530)
Clang provides a __builtin_offsetof which can be detected using
__has_builtin().
Signed-off-by: Alex Richardson <Alexander.Richardson@cl.cam.ac.uk>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
include/sbi/sbi_types.h
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diff --git
a/include/sbi/sbi_types.h
b/include/sbi/sbi_types.h
index
38e3565
..
7fb1af7
100644
(file)
--- a/
include/sbi/sbi_types.h
+++ b/
include/sbi/sbi_types.h
@@
-68,8
+68,14
@@
typedef unsigned long physical_size_t;
#define likely(x) __builtin_expect((x), 1)
#define unlikely(x) __builtin_expect((x), 0)
+#ifndef __has_builtin
+#define __has_builtin(...) 0
+#endif
+
#undef offsetof
-#ifdef __compiler_offsetof
+#if __has_builtin(__builtin_offsetof)
+#define offsetof(TYPE, MEMBER) __builtin_offsetof(TYPE,MEMBER)
+#elif defined(__compiler_offsetof)
#define offsetof(TYPE, MEMBER) __compiler_offsetof(TYPE,MEMBER)
#else
#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)