# 4. Finally
# $ exit
+# 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
+
# We use a trap below for cleanup. This requires us to go through
# hoops to get the right exit status transported through the handler.
# So use `Exit STATUS' instead of `exit STATUS' inside of the tests.
}
# Consider the files in directory, $1.
-# For each file name of the form PROG.exe, create a shim function named
+# For each file name of the form PROG.exe, create an alias named
# PROG that simply invokes PROG.exe, then return 0. If any selected
# file name or the directory name, $1, contains an unexpected character,
# define no function and return 1.
-create_exe_shim_functions_()
+create_exe_shims_()
{
case $EXEEXT in
'') return 0 ;;
*) echo "$0: unexpected \$EXEEXT value: $EXEEXT" 1>&2; return 1 ;;
esac
- base_names_=$(find_exe_basenames_ $1) \
+ base_names_=`find_exe_basenames_ $1` \
|| { echo "$0 (exe_shim): skipping directory: $1" 1>&2; return 1; }
if test -n "$base_names_"; then
for base_ in $base_names_; do
- # Create a function named $base whose sole job is to invoke
- # $base_$EXEEXT, assuming its containing dir is already in PATH.
- eval "$base_() { $base_$EXEEXT"' "$@"; }'
+ alias "$base_"="$base_$EXEEXT"
done
fi
esac
PATH="$abs_path_dir_:$PATH"
- # Create a function FOO for each FOO.exe in this directory.
- create_exe_shim_functions_ "$abs_path_dir_"
+ # Create an alias, FOO, for each FOO.exe in this directory.
+ create_exe_shims_ "$abs_path_dir_" \
+ || fail_ "something failed (above): $abs_path_dir_"
shift
done
export PATH