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build: try to use _Static_assert if static_assert is not available

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* configure.ac: Check for _Static_assert if static_assert
is not available.
* static_assert.h [!HAVE_STATIC_ASSERT && HAVE__STATIC_ASSERT]
(static_assert): Define to _Static_assert.
This commit is contained in:
Дмитрий Левин 2018-04-27 07:19:52 +00:00
parent 96ebee2121
commit bd9845770f
2 changed files with 34 additions and 7 deletions
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30
configure.ac
View File

@ -797,13 +797,31 @@ fi
AC_CACHE_CHECK([for static_assert], [st_cv_have_static_assert],
[AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <assert.h>]],
[[static_assert(1,"")]])],
[[static_assert(1,"")]]
)
],
[st_cv_have_static_assert=yes],
[st_cv_have_static_assert=no])])
if test "x$st_cv_have_static_assert" = xyes; then
AC_DEFINE([HAVE_STATIC_ASSERT], [1],
[Define to 1 if the system provides static_assert])
fi
[AC_LINK_IFELSE([AC_LANG_PROGRAM([],
[[_Static_assert(1,"")]]
)
],
[st_cv_have_static_assert=_Static_assert],
[st_cv_have_static_assert=no]
)
]
)
]
)
case "x$st_cv_have_static_assert" in
xyes)
AC_DEFINE([HAVE_STATIC_ASSERT], [1],
[Define to 1 if the system provides static_assert])
;;
x_Static_assert)
AC_DEFINE([HAVE__STATIC_ASSERT], [1],
[Define to 1 if the system provides _Static_assert])
;;
esac
AC_CHECK_LIB([dl], [dladdr], [dl_LIBS='-ldl'], [dl_LIBS=])
if test "x$ac_cv_lib_dl_dladdr" = xyes; then

11
static_assert.h
View File

@ -30,7 +30,16 @@
#include "assert.h"
#ifndef HAVE_STATIC_ASSERT
#if defined HAVE_STATIC_ASSERT
/* static_assert is already available */
#elif defined HAVE__STATIC_ASSERT
# undef static_assert
# define static_assert _Static_assert
#else /* !HAVE_STATIC_ASSERT && !HAVE__STATIC_ASSERT */
# define static_assert(expr, message) \
extern int (*strace_static_assert(int))[sizeof(int[2 * !!(expr) - 1])]