new module vararrays

[Paul Eggert]

I installed this into gnulib, since I think other modules can use it:

2006-10-24  Paul Eggert  <address@hidden>

        * modules/vararrays: New file.
        * m4/vararrays.m4: New file, taken from diffutils.
        * MODULES.html.sh: New module vararrays.

Index: MODULES.html.sh
===================================================================
RCS file: /cvsroot/gnulib/gnulib/MODULES.html.sh,v
retrieving revision 1.154
diff -p -u -r1.154 MODULES.html.sh
--- MODULES.html.sh     24 Oct 2006 18:18:19 -0000      1.154
+++ MODULES.html.sh     24 Oct 2006 22:27:11 -0000
@@ -1697,6 +1697,16 @@ func_all_modules ()
   func_wrap H2
   func_echo "$element"
 
+  element="Core language properties"
+  element=`printf "%s" "$element" | sed -e "$sed_lt" -e "$sed_gt"`
+  func_section_wrap isoc_core_properties
+  func_wrap H3
+  func_echo "$element"
+
+  func_begin_table
+  func_module vararrays
+  func_end_table
+
   element="Sizes of integer types <limits.h>"
   element=`printf "%s" "$element" | sed -e "$sed_lt" -e "$sed_gt"`
   func_section_wrap isoc_sup_limits
--- /dev/null   2005-09-24 22:00:15.000000000 -0700
+++ m4/vararrays.m4     2006-10-24 15:17:50.000000000 -0700
@@ -0,0 +1,37 @@
+# Check for variable-length arrays.
+
+#serial 1
+
+# From Paul Eggert
+
+# Copyright (C) 2001 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2, or (at your option)
+# any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+# 02110-1301, USA.
+
+AC_DEFUN([AC_C_VARARRAYS],
+[
+  AC_CACHE_CHECK([for variable-length arrays],
+    ac_cv_c_vararrays,
+    [AC_TRY_COMPILE(
+       [],
+       [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
+])
--- /dev/null   2005-09-24 22:00:15.000000000 -0700
+++ modules/vararrays   2006-10-24 15:20:28.000000000 -0700
@@ -0,0 +1,20 @@
+Description:
+Variable-length arrays
+
+Files:
+m4/vararrays.m4
+
+Depends-on:
+
+configure.ac:
+AC_C_VARARRAYS
+
+Makefile.am:
+
+Include:
+
+License:
+LGPL
+
+Maintainer:
+Paul Eggert