build: Prefix rules to avoid collisions

Other included makefiles are defining common rules,
so we use the "rule/" namespace

Change-Id: Ide5a7444f25181169eb46e434e385d94e15a2dec
Signed-off-by: Philippe Coval <[email protected]>

Author: rzr

Makefile

@@ -6,7 +6,7 @@
 # file, You can obtain one at http://mozilla.org/MPL/2.0/
 #}
 
-default: help
+default: rule/help
 
 topdir?=${CURDIR}
 extra_dir?=${topdir}/tmp
@@ -20,10 +20,10 @@ arduino_mk_url?=https://github.com/sudar/Arduino-Makefile
 ARDMK_DIR?=${extra_dir}/arduino-mk
 
 
-help:
+rule/help:
 	@echo "# Usage:"
-	@echo "# make setup # Will install tools and deps"
-	@echo "# make all # Will build all examples"
+	@echo "# make rule/setup # Will install tools and deps"
+	@echo "# make rule/all # Will build all examples"
 
 ${ARDUINO_DIR}:
 	mkdir -p ${@D}
@@ -60,10 +60,10 @@ rule/arduino_lib_dirs: ${ArduinoMDNS_dir} ${ArduinoJson_dir}
 	ls $^
 #}
 
-setup: rule/arduino_dir rule/arduino_mk_dir rule/arduino_lib_dirs
+rule/setup: rule/arduino_dir rule/arduino_mk_dir rule/arduino_lib_dirs
 	sync
 
-all: $(wildcard examples/*/Makefile | sort)
+rule/all: $(wildcard examples/*/Makefile | sort)
 	for file in $^; do \
  dirname=$$(dirname -- "$${file}") ; ${MAKE} -C $${dirname}; \
  done

examples/LevelSensor/Makefile

@@ -9,10 +9,9 @@
 default: all
 	@echo "# $@: $^"
 
-all: rule/setup
-
 top_reldir?=../..
 topdir?=${CURDIR}/${top_reldir}
+
 -include ${topdir}/Makefile
 
 AVR_TOOLS_DIR?=${ARDUINO_DIR}/hardware/tools/avr
@@ -26,7 +25,10 @@ BOARD_TAG=mega2560
 BOARD_SUB=
 MCU?=at${BOARD_TAG}
 F_CPU?=16000000L
-MONITOR_PORT?=$(shell ls /dev/ttyUSB* /dev/ttyACM* | head -n1)
+MONITOR_PORT?=$(shell ls /dev/ttyUSB* 2> /dev/null \
+	|| ls /dev/ttyACM* 2> /dev/null \
+	|| echo "/dev/TODO/setup/monitor" \
+	| sort | head -n1)
 #}
 
 ARCHITECTURE=avr
@@ -41,3 +43,9 @@ ARDUINO_LIBS += ArduinoMDNS
 ARDUINO_LIBS += ArduinoJson
 
 -include ${arduino_mk}
+
+rule/setup:
+	@echo "Please setup your env to use ${arduino_mk}"
+
+%: rule/setup
+	@echo "Please run \"make $@\" again"