From 732d9b281cbcc88a627fddb660a3b4021e1d94cf Mon Sep 17 00:00:00 2001
From: topecongiro <seuchida@gmail.com>
Date: Thu, 26 Oct 2017 06:03:07 +0900
Subject: [PATCH] Return 0 when ./x.py has no subcommand

---
 src/bootstrap/flags.rs | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/bootstrap/flags.rs b/src/bootstrap/flags.rs
index df378188b4ad0..b5d51598fab88 100644
--- a/src/bootstrap/flags.rs
+++ b/src/bootstrap/flags.rs
@@ -136,9 +136,12 @@ To learn more about a subcommand, run `./x.py <subcommand> -h`");
         let subcommand = match subcommand {
             Some(s) => s,
             None => {
-                // No subcommand -- show the general usage and subcommand help
+                // No or an invalid subcommand -- show the general usage and subcommand help
+                // An exit code will be 0 when no subcommand is given, and 1 in case of an invalid
+                // subcommand.
                 println!("{}\n", subcommand_help);
-                process::exit(1);
+                let exit_code = if args.is_empty() { 0 } else { 1 };
+                process::exit(exit_code);
             }
         };