From 895179674130d73fc768dc79ef3dc47b72b5710a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Lisandro=20Dami=C3=A1n=20Nicanor=20P=C3=A9rez=20Meyer?=
 <perezmeyer@gmail.com>
Date: Wed, 14 Nov 2018 10:39:45 -0300
Subject: [PATCH] Print a usage message when invoked without parameters.

Thanks Felix Geyer for the tip.
---
 debian/debtoolchainfilegen | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/debian/debtoolchainfilegen b/debian/debtoolchainfilegen
index 769157469..27cf8eeb2 100755
--- a/debian/debtoolchainfilegen
+++ b/debian/debtoolchainfilegen
@@ -29,6 +29,12 @@
 #
 #  ./debtoolchainfilegen armhf > cmake_toolchain_armhf.cmake
 
+if [ -z "$1" ]
+then
+  echo "Usage: debtoolchainfilegen (arch) > cmake_toolchain_<arch>.cmake"
+  exit 1
+fi
+
 ARCH=$1
 
 DEB_HOST_GNU_TYPE=$(dpkg-architecture -f "-a$1" -qDEB_HOST_GNU_TYPE)