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      1 # statesave.m4 serial 2
      2 
      3 # Copyright (C) 2000-2012 Free Software Foundation, Inc.
      4 
      5 # This program is free software: you can redistribute it and/or modify
      6 # it under the terms of the GNU General Public License as published by
      7 # the Free Software Foundation, either version 3 of the License, or
      8 # (at your option) any later version.
      9 #
     10 # This program is distributed in the hope that it will be useful,
     11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
     12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     13 # GNU General Public License for more details.
     14 #
     15 # You should have received a copy of the GNU General Public License
     16 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
     17 
     18 # AC_STATE_SAVE(FILE)
     19 # -------------------
     20 # Save the shell variables and directory listing.  AT_CHECK_ENV uses these to
     21 # confirm that no test modifies variables outside the Autoconf namespace or
     22 # leaves temporary files.  AT_CONFIG_CMP uses the variable dumps to confirm
     23 # that tests have the same side effects regardless of caching.
     24 #
     25 # The sed script duplicates uniq functionality (thanks to 'info sed
     26 # uniq' for the recipe), in order to avoid a MacOS 10.5 bug where
     27 # readdir can list a file multiple times in a rapidly changing
     28 # directory, while avoiding yet another fork.
     29 m4_defun([AC_STATE_SAVE],
     30 [(set) 2>&1 | sort >state-env.$1
     31 ls | sed '/^at-/d;/^state-/d;/^config\./d
     32   h
     33   :b
     34   $b
     35   N
     36   /^\(.*\)\n\1$/ {
     37     g
     38     bb
     39   }
     40   $b
     41   P
     42   D' >state-ls.$1
     43 ])# AC_STATE_SAVE
     44