diff --git a/tools/merge/.gitignore b/tools/merge/.gitignore
new file mode 100644
index 0000000000000000000000000000000000000000..7fc71ccb60c84c94b0457580cc5b555a31c82b4b
--- /dev/null
+++ b/tools/merge/.gitignore
@@ -0,0 +1 @@
+/a.out