summaryrefslogtreecommitdiffstats
path: root/m4/ax_posix_shell.m4
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 15:59:48 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 15:59:48 +0000
commit3b9b6d0b8e7f798023c9d109c490449d528fde80 (patch)
tree2e1c188dd7b8d7475cd163de9ae02c428343669b /m4/ax_posix_shell.m4
parentInitial commit. (diff)
downloadbind9-3b9b6d0b8e7f798023c9d109c490449d528fde80.tar.xz
bind9-3b9b6d0b8e7f798023c9d109c490449d528fde80.zip
Adding upstream version 1:9.18.19.upstream/1%9.18.19upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'm4/ax_posix_shell.m4')
-rw-r--r--m4/ax_posix_shell.m439
1 files changed, 39 insertions, 0 deletions
diff --git a/m4/ax_posix_shell.m4 b/m4/ax_posix_shell.m4
new file mode 100644
index 0000000..2755fae
--- /dev/null
+++ b/m4/ax_posix_shell.m4
@@ -0,0 +1,39 @@
+# 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])
+ ])