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include: Use __has_builtin to detect __builtin_offsetof support

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The __has_builtin operator is more specific and is supported by GCC
and Clang, while __is_identifier() is less specific and only supported
by Clang, so we should prefer the former whenever it is available, and
only fallback to use the latter when the former is missing and the
latter.
This commit is contained in:
Guillem Jover 2022-12-20 22:47:02 +01:00
parent ec88b7bbbc
commit fe21244b05
1 changed files with 4 additions and 1 deletions
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5
include/bsd/sys/cdefs.h
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@ -37,6 +37,9 @@
#ifndef __is_identifier
#define __is_identifier(x) 1
#endif
#ifndef __has_builtin
#define __has_builtin(x) !__is_identifier(x)
#endif
#ifdef LIBBSD_OVERLAY
/*
@ -182,7 +185,7 @@
* require it.
*/
#ifndef __offsetof
# if LIBBSD_GCC_VERSION >= 0x0401 || !__is_identifier(__builtin_offsetof)
# if LIBBSD_GCC_VERSION >= 0x0401 || __has_builtin(__builtin_offsetof)
# define __offsetof(type, field) __builtin_offsetof(type, field)
# else
# ifndef __cplusplus