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# wmemchr.m4 serial 4
dnl Copyright (C) 2011-2020 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
AC_DEFUN([gl_FUNC_WMEMCHR],
[
AC_REQUIRE([gl_WCHAR_H_DEFAULTS])
dnl We cannot use AC_CHECK_FUNCS here, because the MSVC 9 header files
dnl provide this function as an inline function definition.
AC_CACHE_CHECK([for wmemchr], [gl_cv_func_wmemchr],
[AC_LINK_IFELSE(
[AC_LANG_PROGRAM([[
/* Tru64 with Desktop Toolkit C has a bug: <stdio.h> must be included before
<wchar.h>.
BSD/OS 4.0.1 has a bug: <stddef.h>, <stdio.h> and <time.h> must be included
before <wchar.h>. */
#include <stddef.h>
#include <stdio.h>
#include <time.h>
#include <wchar.h>
]],
[[return ! wmemchr ((const wchar_t *) 0, (wchar_t) ' ', 0);]])
],
[gl_cv_func_wmemchr=yes],
[gl_cv_func_wmemchr=no])
])
if test $gl_cv_func_wmemchr = no; then
HAVE_WMEMCHR=0
fi
])
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