# statesave.m4 serial 2

# Copyright (C) 2000-2012 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 3 of the License, 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, see <http://www.gnu.org/licenses/>.

# AC_STATE_SAVE(FILE)

# -------------------

# Save the shell variables and directory listing.  AT_CHECK_ENV uses these to

# confirm that no test modifies variables outside the Autoconf namespace or

# leaves temporary files.  AT_CONFIG_CMP uses the variable dumps to confirm

# that tests have the same side effects regardless of caching.

#

# The sed script duplicates uniq functionality (thanks to 'info sed

# uniq' for the recipe), in order to avoid a MacOS 10.5 bug where

# readdir can list a file multiple times in a rapidly changing

# directory, while avoiding yet another fork.

m4_defun([AC_STATE_SAVE],

[(set) 2>&1 | sort >state-env.$1

ls | sed '/^at-/d;/^state-/d;/^config\./d

  h

  :b

  $b

  N

  /^\(.*\)\n\1$/ {

    g

    bb

  }

  $b

  P

  D' >state-ls.$1

])# AC_STATE_SAVE