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