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internal/static_assert.h rework

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ISO/IEC 9899:2011 section 7.2 states that <assert.h> must define
static_assert.  Use it when available.
This commit is contained in:
卜部昌平 2019-12-02 17:06:40 +09:00
parent 6581db2187
commit 68c0dc8d36
Notes: git 2019-12-26 20:46:06 +09:00 
Merged: https://github.com/ruby/ruby/pull/2711
1 changed files with 13 additions and 6 deletions
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19
internal/static_assert.h
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@ -9,13 +9,20 @@
* modify this file, provided that the conditions mentioned in the
* file COPYING are met. Consult the file for details.
*/
#include <assert.h> /* for static_assert */
#include "compilers.h" /* for __has_extension */
#if defined(static_assert)
/* Take assert.h definition */
# define STATIC_ASSERT(name, expr) static_assert(expr, # name ": " # expr)
#elif __has_extension(c_static_assert) || GCC_VERSION_SINCE(4, 6, 0)
# define STATIC_ASSERT(name, expr) \
__extension__ _Static_assert(expr, # name ": " # expr)
#if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 201112L)
# define STATIC_ASSERT(name, expr) _Static_assert(expr, #name ": " #expr)
#elif GCC_VERSION_SINCE(4, 6, 0) || __has_extension(c_static_assert)
# define STATIC_ASSERT(name, expr) RB_GNUC_EXTENSION _Static_assert(expr, #name ": " #expr)
#else
# define STATIC_ASSERT(name, expr) typedef int static_assert_##name##_check[1 - 2*!(expr)]
#endif
# define STATIC_ASSERT(name, expr) \
typedef int static_assert_ ## name ## _check[1 - 2 * !(expr)]
#endif /* static_assert */
#endif /* INTERNAL_STATIC_ASSERT_H */