MycroftOS: BNuilding now uses a proper Makefile.

- Big thx once again to the HassOS guys.

Makefile

@@ -0,0 +1,43 @@
+RELEASE_DIR = release
+
+BUILDROOT=buildroot
+BUILDROOT_EXTERNAL=buildroot-external
+DEFCONFIG_DIR = $(BUILDROOT_EXTERNAL)/configs
+
+TARGETS := $(notdir $(patsubst %_defconfig,%,$(wildcard $(DEFCONFIG_DIR)/*_defconfig)))
+TARGETS_CONFIG := $(notdir $(patsubst %_defconfig,%-config,$(wildcard $(DEFCONFIG_DIR)/*_defconfig)))
+
+.NOTPARALLEL: $(TARGETS) $(TARGETS_CONFIG) all
+
+.PHONY: $(TARGETS) $(TARGETS_CONFIG) all clean help
+
+all: $(TARGETS)
+
+$(RELEASE_DIR):
+	mkdir -p $(RELEASE_DIR)
+
+$(TARGETS_CONFIG): %-config:
+	@echo "config $*"
+	$(MAKE) -C $(BUILDROOT) BR2_EXTERNAL=../$(BUILDROOT_EXTERNAL) "$*_defconfig"
+
+$(TARGETS): %: $(RELEASE_DIR) %-config
+	@echo "build $@"
+	$(MAKE) -C $(BUILDROOT) BR2_EXTERNAL=../$(BUILDROOT_EXTERNAL) 2>&1 | tee logs/buildroot_output.txt
+	cp -f $(BUILDROOT)/output/images/sdcard.img $(RELEASE_DIR)/MycroftOS_$@.img
+
+	# Do not clean when building for one target
+ifneq ($(words $(filter $(TARGETS),$(MAKECMDGOALS))), 1)
+	@echo "clean $@"
+	$(MAKE) -C $(BUILDROOT) BR2_EXTERNAL=../$(BUILDROOT_EXTERNAL) clean
+endif
+	@echo "finished $@"
+
+clean:
+	$(MAKE) -C $(BUILDROOT) BR2_EXTERNAL=../$(BUILDROOT_EXTERNAL) clean
+
+help:
+	@echo "Supported targets: $(TARGETS)"
+	@echo "Run 'make <target>' to build a target image."
+	@echo "Run 'make all' to build all target images."
+	@echo "Run 'make clean' to clean the build output."
+	@echo "Run 'make <target>-config' to configure buildroot for a target."

documentation/building.md

@@ -17,9 +17,15 @@ If this is the very first time you are going to build an image, you need to exec
 This will patch the Buildroot packages.
 
 ## Building the image.
-We can build the image(s) by running the following command;
+Building the image(s) can be done by utilizing a proper Makefile;
 <br>
-- ./scripts/build.sh
+To see the available commands, just run: 'make help'
 <br>
-At this moment only one image get's build. Namely the one for RPi3. Later on in time this section will get expanded with other possible supported hardware.
+As example to build the rpi3 version;<br>
+make clean<br>
+make rpi3-config<br>
+make rpi3<br>
+<br>
+To build all available buids, run;<br>
+make all