66 lines
1.7 KiB
Plaintext
66 lines
1.7 KiB
Plaintext
dnl SPDX-License-Identifier: FSFULLR
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# Find a POSIX-conforming shell.
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# Copyright (C) 2007-2008 Free Software Foundation, Inc.
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# This file is free software; the Free Software Foundation
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# gives unlimited permission to copy and/or distribute it,
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# with or without modifications, as long as this notice is preserved.
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# Written by Paul Eggert.
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# If a POSIX-conforming shell can be found, set POSIX_SHELL and
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# PREFERABLY_POSIX_SHELL to it. If not, set POSIX_SHELL to the
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# empty string and PREFERABLY_POSIX_SHELL to '/bin/sh'.
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AC_DEFUN([gl_POSIX_SHELL],
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[
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AC_CACHE_CHECK([for a shell that conforms to POSIX], [gl_cv_posix_shell],
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[gl_test_posix_shell_script='
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func_return () {
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(exit [$]1)
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}
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func_success () {
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func_return 0
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}
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func_failure () {
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func_return 1
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}
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func_ret_success () {
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return 0
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}
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func_ret_failure () {
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return 1
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}
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subshell_umask_sanity () {
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(umask 22; (umask 0); test $(umask) -eq 22)
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}
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test "[$](echo foo)" = foo &&
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func_success &&
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! func_failure &&
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func_ret_success &&
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! func_ret_failure &&
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(set x && func_ret_success y && test x = "[$]1") &&
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subshell_umask_sanity
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'
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for gl_cv_posix_shell in \
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"$CONFIG_SHELL" "$SHELL" /bin/sh /bin/bash /bin/ksh /bin/sh5 no; do
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case $gl_cv_posix_shell in
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/*)
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"$gl_cv_posix_shell" -c "$gl_test_posix_shell_script" 2>/dev/null \
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&& break;;
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esac
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done])
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if test "$gl_cv_posix_shell" != no; then
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POSIX_SHELL=$gl_cv_posix_shell
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PREFERABLY_POSIX_SHELL=$POSIX_SHELL
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else
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POSIX_SHELL=
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PREFERABLY_POSIX_SHELL=/bin/sh
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fi
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AC_SUBST([POSIX_SHELL])
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AC_SUBST([PREFERABLY_POSIX_SHELL])
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])
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