sw: Switch to non-recursive Make build system (#171)

sw/apps/common.mk

@@ -0,0 +1,23 @@
+# Copyright 2023 ETH Zurich and University of Bologna.
+# Licensed under the Apache License, Version 2.0, see LICENSE for details.
+# SPDX-License-Identifier: Apache-2.0
+#
+# Luca Colagrande <[email protected]>
+
+DATA_DIR    := $(realpath $(SRC_DIR)/../data)
+SCRIPTS_DIR := $(realpath $(SRC_DIR)/../scripts)
+
+$(APP)_DATA_CFG ?= $(DATA_DIR)/params.json
+SECTION         ?=
+DATA_H          := $($(APP)_BUILD_DIR)/data.h
+DATAGEN_PY       = $(SCRIPTS_DIR)/datagen.py
+
+$(APP)_HEADERS := $(DATA_H)
+$(APP)_INCDIRS := $(dir $(DATA_H)) $(SRC_DIR)
+
+$(dir $(DATA_H)):
+	mkdir -p $@
+
+$(DATA_H): DATA_CFG := $($(APP)_DATA_CFG)
+$(DATA_H): $(DATAGEN_PY) $($(APP)_DATA_CFG) | $(dir $(DATA_H))
+	$< -c $(DATA_CFG) --section="$(SECTION)" $@

sw/dnn/common.mk

@@ -4,32 +4,6 @@
 #
 # Luca Colagrande <[email protected]>
 
-# Usage of absolute paths is required to externally include this Makefile
-MK_DIR := $(dir $(realpath $(lastword $(MAKEFILE_LIST))))
-
-DATA_DIR       := $(realpath $(MK_DIR)/$(APP)/data)
-SCRIPTS_DIR    := $(realpath $(MK_DIR)/$(APP)/scripts)
-SRC_DIR        := $(realpath $(MK_DIR)/$(APP)/src)
-COMMON_SRC_DIR := $(realpath $(MK_DIR)/src)
-
-DATA_CFG ?= $(DATA_DIR)/params.json
-SECTION  ?=
-
-SRCS    ?= $(realpath $(SRC_DIR)/main.c)
-INCDIRS ?= $(dir $(DATA_H)) $(SRC_DIR) $(COMMON_SRC_DIR)
-
-DATAGEN_PY = $(SCRIPTS_DIR)/datagen.py
-DATA_H    ?= $(DATA_DIR)/data.h
-
-$(dir $(DATA_H)):
-	mkdir -p $@
-
-$(DATA_H): $(DATAGEN_PY) $(DATA_CFG) | $(dir $(DATA_H))
-	$< -c $(DATA_CFG) --section="$(SECTION)" $@
-
-.PHONY: clean-data clean
-
-clean-data:
-	rm -f $(DATA_H)
-
-clean: clean-data
+include $(ROOT)/sw/apps/common.mk
+$(APP)_INCDIRS += $(ROOT)/sw/dnn/src
+$(APP)_INCDIRS += $(ROOT)/sw/blas