(change_file_mode): Likewise.
(change_dir_mode): Likewise.
+ * ln.c (do_link): Declare pointer parameters to be const.
+
+ * df.c (selected_fstype): Move definition to precede use.
+ Remove prototype. Declare parameter FSTYPE to be const.
+ (excluded_fstype): Likewise.
+ (main): Fail with a diagnostic if both --human-readable and
+ --portability are used.
+ Likewise if --megabytes and --portability are used.
+
* modechange.c (mode_compile): Declare parameter MODE_STRING const.
Remove register attribute.
(mode_adjust): Likewise for CHANGES.