-#serial 1
+# Check for a working shell.
-# Check for a working (i.e. POSIX-compatible) shell.
+# Copyright (C) 2000-2001, 2007, 2009-2017 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_DEFUN([AC_PROG_SHELL],
+ [AC_MSG_CHECKING([for a POSIX-compliant shell])
AC_CACHE_VAL(ac_cv_path_shell,
- [ac_cv_path_shell=no
- IFS="${IFS= }"; ac_save_ifs="$IFS"; IFS=":"
- ac_dummy=/bin:/usr/bin:/usr/bin/posix:/usr/xpg4/bin:$PATH
- for ac_dir in $ac_dummy; do
- for ac_base in sh bash ksh sh5; do
- case "$ac_dir" in
- /*)
- if ("$ac_dir/$ac_base" -c '
+ [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
- # Test the noclobber option,
- # using the portable POSIX.2 syntax.
- set -C
- rm -f conftest.c || exit
- >conftest.c || exit
- >|conftest.c || exit
- !>conftest.c || exit
+ 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
- ') 2>/dev/null; then
- ac_cv_path_shell="$ac_dir/$ac_base"
- break
- fi
- ;;
- esac
- done
- if test "$ac_cv_path_shell" != no; then
- break
- fi
- done
- IFS="$ac_save_ifs"])
+ 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 is not POSIX-compliant)
+ 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)])
projects / debian / gzip / blobdiff