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# Check for a working shell.
# Copyright (C) 2000-2001, 2007, 2009-2016 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, 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., 59 Temple Place - Suite 330, Boston, MA
# 02111-1307, USA.
# AC_PROG_SHELL
# -------------
# Check for a working (i.e. POSIX-compatible) shell.
# Written by Paul Eggert <eggert@twinsun.com>,
# from an idea suggested by Albert Chin-A-Young <china@thewrittenword.com>.
AC_DEFUN([AC_PROG_SHELL],
[AC_MSG_CHECKING([for a POSIX-compliant shell])
AC_CACHE_VAL(ac_cv_path_shell,
[ac_command='
# Test the noclobber option, using the portable POSIX.2 syntax.
set -C
rm -f conftest.c
>conftest.c || exit
>|conftest.c || exit
!>conftest.c || exit
# Test that $(...) works.
test "$(expr 3 + 4)" -eq 7 || exit
'
# Solaris 11 /bin/sh (AT&T Research) 93u 2011-02-08 has a file
# descriptor bug that breaks zgrep and is hard to test for
# directly. At some point $(...) is reading a pipe from the
# subshell, but the pipe is also open in the parent shell, so
# the read deadlocks. Prefer some other shell if available.
ac_maybe_solaris_sh_bug='test "${.sh.version}"'
ac_cv_path_shell=no
case $SHELL in
/*)
rm -f conftest.c
if ("$SHELL" -c "$ac_command") 2>/dev/null; then
"$SHELL" -c "$ac_maybe_solaris_sh_bug" 2>/dev/null ||
ac_cv_path_shell=$SHELL
fi
esac
case $ac_cv_path_shell in
no)
# Prefer shells that are more likely to be installed in the
# same place on all hosts of this platform. Therefore, prefer
# shells in /bin and /usr/bin to shells in the installer's
# PATH. Also, loop through PATH first and then through
# shells, since less-"nice" shells in /bin and /usr/bin are
# more likely to be installed than "nicer" shells elsewhere.
ac_break_if_good_shell=:
as_save_IFS=$IFS; IFS=:
for as_dir in /bin /usr/bin $PATH
do
IFS=$as_save_IFS
case $as_dir in
/*)
for ac_base in sh bash ksh sh5; do
rm -f conftest.c
if ("$as_dir/$ac_base" -c "$ac_command") 2>/dev/null; then
if "$as_dir/$ac_base" -c "$ac_maybe_solaris_sh_bug" 2>/dev/null
then
test "$ac_cv_path_shell" = no
else
ac_break_if_good_shell=break
:
fi && ac_cv_path_shell=$as_dir/$ac_base
$ac_break_if_good_shell
fi
done
$ac_break_if_good_shell
esac
done
rm -f conftest.c
esac])
AC_MSG_RESULT($ac_cv_path_shell)
SHELL=$ac_cv_path_shell
if test "$SHELL" = no; then
SHELL=/bin/sh
AC_MSG_WARN([using $SHELL, even though it does not conform to POSIX])
fi
if "$SHELL" -c "$ac_maybe_solaris_sh_bug" 2>/dev/null; then
AC_MSG_WARN([using $SHELL, even though it may have file descriptor bugs])
fi
AC_SUBST(SHELL)])
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