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Use normal static_assert in mrb_static_assert as much as possible

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* `_Static_assert` can also be used with `-std=gnu99` on GCC >= 4.6.
* `static_assert` can be used on MSVC.
* `static_assert` can be used even on old G++/Clang++ if
  `__GXX_EXPERIMENTAL_CXX0X__` is defined.
This commit is contained in:
KOBAYASHI Shuji
2020-08-11 20:25:40 +09:00
parent ab5726d4e4
commit bab7e9f032
1 changed files with 8 additions and 4 deletions
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include/mruby.h
+8 -4
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@@ -62,12 +62,16 @@
#define mrb_assert_int_fit(t1,n,t2,max) ((void)0)
#endif
#if (defined __STDC_VERSION__ && __STDC_VERSION__ >= 201112L) || \
(defined __cplusplus && __cplusplus >= 201103L)
# include <assert.h>
#if (defined __cplusplus && __cplusplus >= 201103L) || \
(defined _WIN32 && !defined __MINGW32__) || \
(defined __GXX_EXPERIMENTAL_CXX0X__) /* for old G++/Clang++ */
# define mrb_static_assert(exp, str) static_assert(exp, str)
#elif defined __STDC_VERSION__ && \
((__STDC_VERSION__ >= 201112L) || \
(defined __GNUC__ && __GNUC__ * 100 + __GNUC_MINOR__ >= 406))
# define mrb_static_assert(exp, str) _Static_assert(exp, str)
#else
/* C version of static_assert() */
# /* alternative implementation of static_assert() */
# define _mrb_static_assert_cat0(a, b) a##b
# define _mrb_static_assert_cat(a, b) _mrb_static_assert_cat0(a, b)
# ifdef __COUNTER__