+# We require $(...) support unconditionally.
+# We require a few additional shell features only when $EXEEXT is nonempty,
+# in order to support automatic $EXEEXT emulation:
+# - hyphen-containing alias names
+# - we prefer to use ${var#...} substitution, rather than having
+# to work around lack of support for that feature.
+# The following code attempts to find a shell with support for these features
+# and re-exec's it. If not, it skips the current test.
+
+gl_shell_test_script_='
+test $(echo y) = y || exit 1
+test -z "$EXEEXT" && exit 0
+shopt -s expand_aliases
+alias a-b="echo zoo"
+v=abx
+ test ${v%x} = ab \
+ && test ${v#a} = bx \
+ && test $(a-b) = zoo
+'
+
+if test "x$1" = "x--no-reexec"; then
+ shift
+else
+ for re_shell_ in "${CONFIG_SHELL:-no_shell}" /bin/sh bash dash zsh pdksh fail
+ do
+ test "$re_shell_" = no_shell && continue
+ test "$re_shell_" = fail && skip_ failed to find an adequate shell
+ if "$re_shell_" -c "$gl_shell_test_script_" 2>/dev/null; then
+ exec "$re_shell_" "$0" --no-reexec "$@"
+ echo "$ME_: exec failed" 1>&2
+ exit 127
+ fi
+ done
+fi
+
+test -n "$EXEEXT" && shopt -s expand_aliases
+