From 4c0029711248f7d2fe947ee95efee9571ec0b719 Mon Sep 17 00:00:00 2001
From: Jussi Pakkanen <jpakkane@gmail.com>
Date: Mon, 31 Jul 2017 11:20:09 +0100
Subject: Improve ac_converter to print a help message.

---
 tools/ac_converter.py | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/tools/ac_converter.py b/tools/ac_converter.py
index eda5097..739c42c 100755
--- a/tools/ac_converter.py
+++ b/tools/ac_converter.py
@@ -14,7 +14,9 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-"""This script reads config.h.meson, looks for header
+help_message = """Usage: %s <config.h.meson>
+
+This script reads config.h.meson, looks for header
 checks and writes the corresponding meson declaration.
 
 Copy config.h.in to config.h.meson, replace #undef
@@ -364,6 +366,11 @@ function_data = \
 headers = []
 functions = []
 sizes = []
+
+if len(sys.argv) != 2:
+    print(help_message % sys.argv[0])
+    sys.exit(0)
+
 with open(sys.argv[1]) as f:
     for line in f:
         line = line.strip()
-- 
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