topic_listener: added missing build deps

The posix build would complain that toipc_listener.cpp did not exist
and there was no rule to create it.

The required rule was added to src/systemcmds/topic_listener/module.mk

The script generate_listener.py is run from the Build tree and needs to
access $(PX4_BASE)/msgs so $(PX4_BASE) is now passed as an argument to
generate_listener.py

Signed-off-by: Mark Charlebois <charlebm@gmail.com>

.gitignore

@@ -48,5 +48,6 @@ unittests/build
 .vagrant
 *.pretty
 xcode
-src/platforms/linux/px4_messages/
-src/systemcmds/topic_listener.cpp
+src/platforms/posix/px4_messages/
+src/platforms/qurt/px4_messages/
+src/systemcmds/topic_listener/topic_listener.cpp

Tools/generate_listener.py

 #!/usr/bin/python
 
 import glob
+import sys
 
-raw_messages = glob.glob("../msg/*.msg")
+# This script is run from Build/<target>_default.build/$(PX4_BASE)/Firmware/src/systemcmds/topic_listener
+
+# argv[1] must be the full path of the top Firmware dir
+
+raw_messages = glob.glob(sys.argv[1]+"/msg/*.msg")
 messages = []
 message_floats = []
 

Tools/posix_apps.py

@@ -33,7 +33,6 @@
 ############################################################################
 
 import glob
-#builtins = glob.glob("../Build/linux_default.build/builtin_commands/COMMAND*")
 builtins = glob.glob("builtin_commands/COMMAND*")
 
 apps = []

src/systemcmds/topic_listener/module.mk

@@ -35,6 +35,9 @@
 # Build the topic listener tool.
 #
 
+$(PX4_BASE)/src/systemcmds/topic_listener/topic_listener.cpp : $(PX4_BASE)/Tools/generate_listener.py
+	$(PX4_BASE)/Tools/generate_listener.py $(PX4_BASE) > $(PX4_BASE)/src/systemcmds/topic_listener/$@
+
 MODULE_COMMAND	 = listener
 SRCS		 = topic_listener.cpp