Check if opus_compare is executable in run_vectors.sh
If opus_compare doesn't exist or isn't executable, tests failed normally
which could be misleading.
So test for existence and mode to avoid this ambiguity.
diff --git a/tests/run_vectors.sh b/tests/run_vectors.sh
index 1cc445d..116a743 100755
--- a/tests/run_vectors.sh
+++ b/tests/run_vectors.sh
@@ -57,6 +57,11 @@
exit 0
fi
+if [ ! -x $OPUS_COMPARE ]; then
+ echo ERROR: Compare program not found: $OPUS_COMPARE
+ exit 1
+fi
+
if [ -x $OPUS_DEMO ]; then
echo Decoding with $OPUS_DEMO
else