-if diff_out_=`exec 2>/dev/null; diff -u "$0" "$0" < /dev/null` \
- && diff -u Makefile "$0" 2>/dev/null | grep '^[+]#!' >/dev/null; then
- # diff accepts the -u option and does not (like AIX 7 'diff') produce an
- # extra space on column 1 of every content line.
- if test -z "$diff_out_"; then
- compare_ () { diff -u "$@"; }
- else
- compare_ ()
- {
- if diff -u "$@" > diff.out; then
- # No differences were found, but Solaris 'diff' produces output
- # "No differences encountered". Hide this output.
- rm -f diff.out
- true
- else
- cat diff.out
- rm -f diff.out
- false
- fi
- }
- fi
-elif
- for diff_opt_ in -U3 -c '' no; do
- test "$diff_opt_" = no && break
- diff_out_=`exec 2>/dev/null; diff $diff_opt_ "$0" "$0" </dev/null` && break
- done
- test "$diff_opt_" != no
-then
+for diff_opt_ in -u -U3 -c '' no; do
+ test "$diff_opt_" != no &&
+ diff_out_=`exec 2>/dev/null; diff $diff_opt_ "$0" "$0" < /dev/null` &&
+ break
+done
+if test "$diff_opt_" != no; then