Makefile: implement a graph-size target

This commit implements a graph-size target that calls the script of
the same name to generate the graph and CSV files related to package
and file sizes.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Tested-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

Makefile

@@ -686,6 +686,13 @@ graph-depends: graph-depends-requirements
 	|tee $(GRAPHS_DIR)/$(@).dot \
 	|dot $(BR2_GRAPH_DOT_OPTS) -T$(BR_GRAPH_OUT) -o $(GRAPHS_DIR)/$(@).$(BR_GRAPH_OUT)
 
+graph-size:
+	$(Q)mkdir -p $(GRAPHS_DIR)
+	$(Q)$(TOPDIR)/support/scripts/size-stats --builddir $(BASE_DIR) \
+		--graph $(GRAPHS_DIR)/graph-size.$(BR_GRAPH_OUT) \
+		--file-size-csv $(GRAPHS_DIR)/file-size-stats.csv \
+		--package-size-csv $(GRAPHS_DIR)/package-size-stats.csv
+
 else # ifeq ($(BR2_HAVE_DOT_CONFIG),y)
 
 all: menuconfig
@@ -903,6 +910,7 @@ endif
 	@echo '  manual-epub            - build manual in ePub'
 	@echo '  graph-build            - generate graphs of the build times'
 	@echo '  graph-depends          - generate graph of the dependency tree'
+	@echo '  graph-size             - generate stats of the filesystem size'
 	@echo '  list-defconfigs        - list all defconfigs (pre-configured minimal systems)'
 	@echo
 	@echo 'Miscellaneous:'