+dnl CF_C11_NORETURN version: 3 updated: 2021/03/28 11:36:23
+dnl ---------------
+AC_DEFUN([CF_C11_NORETURN],
+[
+AC_MSG_CHECKING(if you want to use C11 _Noreturn feature)
+CF_ARG_ENABLE(stdnoreturn,
+ [ --enable-stdnoreturn enable C11 _Noreturn feature for diagnostics],
+ [enable_stdnoreturn=yes],
+ [enable_stdnoreturn=no])
+AC_MSG_RESULT($enable_stdnoreturn)
+
+if test $enable_stdnoreturn = yes; then
+AC_CACHE_CHECK([for C11 _Noreturn feature], cf_cv_c11_noreturn,
+ [AC_TRY_COMPILE([
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdnoreturn.h>
+static _Noreturn void giveup(void) { exit(0); }
+ ],
+ [if (feof(stdin)) giveup()],
+ cf_cv_c11_noreturn=yes,
+ cf_cv_c11_noreturn=no)
+ ])
+else
+ cf_cv_c11_noreturn=no,
+fi
+
+if test "$cf_cv_c11_noreturn" = yes; then
+ AC_DEFINE(HAVE_STDNORETURN_H, 1,[Define if <stdnoreturn.h> header is available and working])
+ AC_DEFINE_UNQUOTED(STDC_NORETURN,_Noreturn,[Define if C11 _Noreturn keyword is supported])
+ HAVE_STDNORETURN_H=1
+else
+ HAVE_STDNORETURN_H=0
+fi
+
+AC_SUBST(HAVE_STDNORETURN_H)
+AC_SUBST(STDC_NORETURN)
+])dnl
+dnl ---------------------------------------------------------------------------