1# ===========================================================================
2#     http://www.gnu.org/software/autoconf-archive/ax_configure_args.html
3# ===========================================================================
4#
5# SYNOPSIS
6#
7#   AX_CONFIGURE_ARGS
8#
9# DESCRIPTION
10#
11#   Helper macro for AX_ENABLE_BUILDDIR.
12#
13#   The traditional way of starting a subdir-configure is running the script
14#   with ${1+"$@"} but since autoconf 2.60 this is broken. Instead we have
15#   to rely on eval'ing $ac_configure_args however some old autoconf
16#   versions do not provide that. To ensure maximum portability of autoconf
17#   extension macros this helper can be AC_REQUIRE'd so that
18#   $ac_configure_args will alsways be present.
19#
20#   Sadly, the traditional "exec $SHELL" of the enable_builddir macros is
21#   spoiled now and must be replaced by "eval + exit $?".
22#
23#   Example:
24#
25#     AC_DEFUN([AX_ENABLE_SUBDIR],[dnl
26#       AC_REQUIRE([AX_CONFIGURE_ARGS])dnl
27#       eval $SHELL $ac_configure_args || exit $?
28#       ...])
29#
30# LICENSE
31#
32#   Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
33#
34#   This program is free software; you can redistribute it and/or modify it
35#   under the terms of the GNU General Public License as published by the
36#   Free Software Foundation; either version 3 of the License, or (at your
37#   option) any later version.
38#
39#   This program is distributed in the hope that it will be useful, but
40#   WITHOUT ANY WARRANTY; without even the implied warranty of
41#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
42#   Public License for more details.
43#
44#   You should have received a copy of the GNU General Public License along
45#   with this program. If not, see <http://www.gnu.org/licenses/>.
46#
47#   As a special exception, the respective Autoconf Macro's copyright owner
48#   gives unlimited permission to copy, distribute and modify the configure
49#   scripts that are the output of Autoconf when processing the Macro. You
50#   need not follow the terms of the GNU General Public License when using
51#   or distributing such scripts, even though portions of the text of the
52#   Macro appear in them. The GNU General Public License (GPL) does govern
53#   all other use of the material that constitutes the Autoconf Macro.
54#
55#   This special exception to the GPL applies to versions of the Autoconf
56#   Macro released by the Autoconf Archive. When you make and distribute a
57#   modified version of the Autoconf Macro, you may extend this special
58#   exception to the GPL to apply to your modified version as well.
59
60#serial 9
61
62AC_DEFUN([AX_CONFIGURE_ARGS],[
63   # [$]@ is unsable in 2.60+ but earlier autoconf had no ac_configure_args
64   if test "${ac_configure_args+set}" != "set" ; then
65      ac_configure_args=
66      for ac_arg in ${1+"[$]@"}; do
67         ac_configure_args="$ac_configure_args '$ac_arg'"
68      done
69   fi
70])
71