Author: ed
Date: Tue Dec 13 19:37:27 2011
New Revision: 228477
URL: http://svn.freebsd.org/changeset/base/228477
Log:
Make support for C1X keywords more complete.
- _Alignof(), which returns the aligment of a certain type.
- _Static_assert(), which can be used to check compile-time assertions.
- _Thread_local, which uses TLS on a variable.
MFC after: 3 months
Reviewed by: mdf
Modified:
head/sys/sys/cdefs.h
Modified: head/sys/sys/cdefs.h
==============================================================================
--- head/sys/sys/cdefs.h Tue Dec 13 18:11:25 2011 (r228476)
+++ head/sys/sys/cdefs.h Tue Dec 13 19:37:27 2011 (r228477)
@@ -218,15 +218,34 @@
#endif
#endif
-
+/*
+ * Keywords added in C1X.
+ */
#if defined(__cplusplus) && __cplusplus >= 201103L
+#define _Alignof(e) alignof(e)
#define _Noreturn [[noreturn]]
+#define _Static_assert(e, s) static_assert(e, s)
+#define _Thread_local thread_local
#elif defined(__STDC_VERSION__) && __STDC_VERSION__ > 201000L
-/* Do nothing - _Noreturn is a keyword */
-#elif defined(__GNUC__)
+/* Do nothing. They are language keywords. */
+#else
+/* Not supported. Implement them manually. */
+#ifdef __GNUC__
+#define _Alignof(e) __alignof__(e)
#define _Noreturn __attribute__((__noreturn__))
+#define _Thread_local __thread
#else
+#define _Alignof(e) __offsetof(struct { char __a; e __b; },
__b)
#define _Noreturn
+#define _Thread_local
+#endif
+#ifdef __COUNTER__
+#define _Static_assert(e, s) __Static_assert(e, __COUNTER__)
+#else
+#define _Static_assert(e, s) __Static_assert(e, __LINE__)
+#endif
+#define __Static_assert(e, c) ___Static_assert(e, c)
+#define ___Static_assert(e, c) typedef char __assert ## c[(e) ? 1 : -1]
#endif
#if __GNUC_PREREQ__(2, 96)
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