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Repair sys/cdefs.h enough to be usable with GCC 5.x

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The __alloc_size and __alloc_align need to be defined to
nothingness for lint, but the existing check is deficient
and allows attributes with working __has_attrubute() to
slip through.
This commit is contained in:
Alexander Kabaev 2015-08-27 14:00:23 +00:00
parent c247c492af
commit 2c51488ec8
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=287206
1 changed files with 12 additions and 13 deletions
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25
sys/sys/cdefs.h
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@ -39,7 +39,6 @@
/*
* Testing against Clang-specific extensions.
*/
#ifndef __has_attribute
#define __has_attribute(x) 0
#endif
@ -212,6 +211,8 @@
#define __unused
#define __packed
#define __aligned(x)
#define __alloc_align(x)
#define __alloc_size(x)
#define __section(x)
#define __weak_symbol
#else
@ -236,6 +237,16 @@
#define __aligned(x) __attribute__((__aligned__(x)))
#define __section(x) __attribute__((__section__(x)))
#endif
#if __has_attribute(alloc_size) || __GNUC_PREREQ__(4, 3)
#define __alloc_size(x) __attribute__((__alloc_size__(x)))
#else
#define __alloc_size(x)
#endif
#if __has_attribute(alloc_align) || __GNUC_PREREQ__(4, 9)
#define __alloc_align(x) __attribute__((__alloc_align__(x)))
#else
#define __alloc_align(x)
#endif
#endif /* lint */
#if !__GNUC_PREREQ__(2, 95)
@ -371,24 +382,12 @@
#define __returns_twice
#endif
#if __has_attribute(alloc_size) || __GNUC_PREREQ__(4, 3)
#define __alloc_size(x) __attribute__((__alloc_size__(x)))
#else
#define __alloc_size(x)
#endif
#if __has_builtin(__builtin_unreachable) || __GNUC_PREREQ__(4, 6)
#define __unreachable() __builtin_unreachable()
#else
#define __unreachable() ((void)0)
#endif
#if __has_attribute(alloc_align) || __GNUC_PREREQ__(4, 9)
#define __alloc_align(x) __attribute__((__alloc_align__(x)))
#else
#define __alloc_align(x)
#endif
/* XXX: should use `#if __STDC_VERSION__ < 199901'. */
#if !__GNUC_PREREQ__(2, 7) && !defined(__INTEL_COMPILER)
#define __func__ NULL