# Check for a working shell.
-# Copyright (C) 2000-2001, 2007, 2009-2012 Free Software Foundation, Inc.
+# 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)
# 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 "$ac_command") 2>/dev/null; then
- ac_cv_path_shell=$SHELL
+ "$SHELL" -c "$ac_maybe_solaris_sh_bug" 2>/dev/null ||
+ ac_cv_path_shell=$SHELL
fi
esac
case $ac_cv_path_shell in
- (no)
+ no)
# Prefer shells that are more likely to be installed in the
# same place on all hosts of this platform. Therefore, prefer
# shells in /bin and /usr/bin to shells in the installer's
# PATH. Also, loop through PATH first and then through
# shells, since less-"nice" shells in /bin and /usr/bin are
# more likely to be installed than "nicer" shells elsewhere.
+ ac_break_if_good_shell=:
as_save_IFS=$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
- ac_cv_path_shell=$as_dir/$ac_base
- break
+ 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
- case $ac_cv_path_shell in
- (/*) break
- esac
+ $ac_break_if_good_shell
esac
done
rm -f conftest.c
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)])