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# Check for variable-length arrays.
# serial 4
# From Paul Eggert
# Copyright (C) 2001, 2009-2013 Free Software Foundation, Inc.
# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.
AC_DEFUN([AC_C_VARARRAYS],
[
AC_CACHE_CHECK([for variable-length arrays],
ac_cv_c_vararrays,
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
[],
[[static int x; char a[++x]; a[sizeof a - 1] = 0; return a[0];]])],
ac_cv_c_vararrays=yes,
ac_cv_c_vararrays=no)])
if test $ac_cv_c_vararrays = yes; then
AC_DEFINE([HAVE_C_VARARRAYS], [1],
[Define to 1 if C supports variable-length arrays.])
fi
])
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