t/ax/is

   1 #! /bin/sh
   2 # Copyright (C) 2012-2017 Free Software Foundation, Inc.
   3 #
   4 # This program is free software; you can redistribute it and/or modify
   5 # it under the terms of the GNU General Public License as published by
   6 # the Free Software Foundation; either version 2, or (at your option)
   7 # any later version.
   8 #
   9 # This program is distributed in the hope that it will be useful,
  10 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 # GNU General Public License for more details.
  13 #
  14 # You should have received a copy of the GNU General Public License
  15 # along with this program.  If not, see <https://www.gnu.org/licenses/>.
  16
  17 # Test that two whitespace-separated lists are equal.
  18 # Assumes the two lists are passed on the command line separated by
  19 # a '==' string.
  20 # This script is useful to test equality of lists in makefile rules,
  21 # in the face of variables defined through line-continuations,
  22 # automake rewrites and expansions of empty variables.
  23
  24 # NOTE: keep this file Bourne-compatible, for the sake of systems with
  25 #       non-POSIX /bin/sh (like Solaris).
  26
  27 set -e
  28 set -u
  29
  30 # Initialize before unsetting, for shells (like older bash or Solaris
  31 # ksh) that fail to unset variables that are already unset.
  32 exp= got=; unset exp got
  33 seen_eqeq=no
  34 while test $# -gt 0; do
  35   if test x"$1" = x"=="; then
  36     if test $seen_eqeq = no; then
  37       seen_eqeq=yes
  38     else
  39       echo "$0: more than one '==' argument seen on command line" >&2
  40       exit 2
  41     fi
  42   else
  43     if test $seen_eqeq = no; then
  44       got=${got+"$got "}$1
  45     else
  46       exp=${exp+"$exp "}$1
  47     fi
  48   fi
  49   shift
  50 done
  51
  52 if test $seen_eqeq = no; then
  53   echo "$0: no '==' argument seen on command line" >&2
  54   exit 2
  55 fi
  56
  57 test x"${exp-}" = x"${got-}"