[build] Use variants

- Move helpers functions into build/helpers.mak
- Move official warning into official targets only

Makefile

@@ -1,34 +1,20 @@
-include build/config.mak
-
 # Disable default Make rules
 .SUFFIXES:
 
-object_for = $(addprefix $(BUILD_DIR)/,$(addsuffix .o,$(basename $(1))))
-
 # Define the default recipe
-
 default:
 
-# Define a standard rule helper
-# If passed a last parameter value of with_local_version, we also define an
-# extra rule that can build source files within the $(BUILD_DIR). This is useful
-# for rules that can be applied for intermediate objects (for example, when
-# going .png -> .cpp -> .o).
+include build/config.mak
+include build/defaults.mak
+include build/platform.$(PLATFORM).mak
+include build/toolchain.$(TOOLCHAIN).mak
+include build/variants.mak
+include build/helpers.mk
 
-define rule_label
-@ echo "$(shell printf "%-8s" $(strip $(1)))$(@:$(BUILD_DIR)/%=%)"
+define foo
 endef
 
-define rule_for
-ifeq ($(strip $(5)),with_local_version)
-$(addprefix $$(BUILD_DIR)/,$(strip $(2))): $(addprefix $$(BUILD_DIR)/,$(strip $(3))) | $(if $(findstring official,${MAKECMDGOALS}),official_authorization)
-	@ echo "$(shell printf "%-8s" $(strip $(1)))$$(@:$$(BUILD_DIR)/%=%)"
-	$(Q) $(4)
-endif
-$(addprefix $$(BUILD_DIR)/,$(strip $(2))): $(strip $(3)) | $$$$(@D)/. $(if $(findstring official,${MAKECMDGOALS}),official_authorization)
-	@ echo "$(shell printf "%-8s" $(strip $(1)))$$(@:$$(BUILD_DIR)/%=%)"
-	$(Q) $(4)
-endef
+$(eval $(call foo))
 
 .PHONY: info
 info:
@@ -83,7 +69,9 @@ $(BUILD_DIR)%/.:
 # Each sub-Makefile can either add sources to $(%_src) variables or define a
 # new executable target. The $(%_src) variables list the sources that can be
 # built and linked to executables being generated.
-
+ifndef USE_LIBA
+  $(error platform.mak should define USE_LIBA)
+endif
 ifeq ($(USE_LIBA),0)
 include liba/Makefile.bridge
 else
@@ -102,7 +90,7 @@ include build/struct_layout/Makefile
 include build/scenario/Makefile
 include quiz/Makefile # Quiz needs to be included at the end
 
-all_src = $(apps_all_src) $(escher_src) $(ion_all_src) $(kandinsky_src) $(liba_src) $(libaxx_src) $(poincare_src) $(python_src) $(runner_src) $(ion_target_device_flasher_light_src) $(ion_target_device_flasher_verbose_src) $(ion_target_device_bench_src) $(tests_src)
+all_src = $(apps_src) $(escher_src) $(ion_src) $(kandinsky_src) $(liba_src) $(libaxx_src) $(poincare_src) $(python_src) $(runner_src) $(ion_device_flasher_src) $(ion_device_bench_src) $(tests_src)
 all_objs = $(call object_for,$(all_src))
 .SECONDARY: $(all_objs)