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# SPDX-License-Identifier: FSFAP
#
# AX_POSIX_SHELL
# -------------
# Check for a POSIX-compatible shell.
#
# LICENSE
#
# Copyright (c) 2021 Internet Systems Consortium
#
# Copying and distribution of this file, with or without modification, are
# permitted in any medium without royalty provided the copyright notice
# and this notice are preserved. This file is offered as-is, without any
# warranty.
AC_DEFUN([AX_POSIX_SHELL],
[AC_CACHE_CHECK([for a POSIX-compatible shell], [ac_cv_prog_shell],
[ac_test_shell_script='
test "$(expr 1 + 1)" = "2" &&
test "$(( 1 + 1 ))" = "2"
'
for ac_cv_prog_shell in \
"$CONFIG_SHELL" "$SHELL" /bin/sh /bin/bash /bin/ksh /bin/sh5 no; do
AS_CASE([$ac_cv_prog_shell],
[/*],[
AS_IF(["$ac_cv_prog_shell" -c "$ac_test_shell_script" 2>/dev/null],
[break])
])
done
])
AS_IF([test "$ac_cv_prog_shell" = "no"],
[SHELL=/bin/sh
AC_MSG_WARN([using $SHELL, even though it does not conform to POSIX])
],
[SHELL="$ac_cv_prog_shell"
])
AC_SUBST([SHELL])
])
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