tests: init.sh: support any non-GNU diff

* tests/init.sh (compare): If "diff -c" is supported but "diff -u" is
not, use "diff -c".  Useful on AIX 6.1, HP-UX 11.31, OSF/1 5.1,
Solaris 8.

diff --git a/tests/init.sh b/tests/init.sh
index 12b3ca3..373d9d4 100644 (file)
--- a/tests/init.sh
+++ b/tests/init.sh
@@ -223,6 +223,8 @@ cleanup_ () { :; }
 
 if ( diff -u "$0" "$0" < /dev/null ) > /dev/null 2>&1; then
   compare () { diff -u "$@"; }
+elif ( diff -c "$0" "$0" < /dev/null ) > /dev/null 2>&1; then
+  compare () { diff -c "$@"; }
 elif ( cmp --version < /dev/null 2>&1 | grep GNU ) > /dev/null 2>&1; then
   compare () { cmp -s "$@"; }
 else