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Replace a CONSTCOND for a void value as a replacement for __unreachable builtin

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This only applies if we are not using clang or gcc but it lets us use the
__unreachable() buitin in expressions.

Suggested by:	tijl
This commit is contained in:
Pedro F. Giffuni 2015-05-15 17:51:03 +00:00
parent d433cf9a8a
commit 1d8055035f
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=282981
1 changed files with 1 additions and 1 deletions
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sys/sys/cdefs.h
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@ -391,7 +391,7 @@
#if __has_builtin(__builtin_unreachable) || __GNUC_PREREQ__(4, 6)
#define __unreachable() __builtin_unreachable()
#else
#define __unreachable() do {} while (/*CONSTCOND*/0)
#define __unreachable() ((void)0)
#endif
#if __has_attribute(alloc_align) || __GNUC_PREREQ__(4, 9)