Add GNU make based build system

Makefile

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+.PHONY: all flash clean
+
+all: compile flash
+
+compile:
+	$(MAKE) -C src
+
+flash:
+	$(MAKE) -C src program
+
+clean:
+	$(MAKE) -C src clean
+

Makefile.conf

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+HERE:=$(dir $(lastword $(MAKEFILE_LIST)))
+
+# Project Name
+TARGET?=blink
+
+# Configure for debugging
+# common configurations:
+# use DEBUG = 1 and OPT = -Og for debugging
+# or DEBUG = 0 and OPT = -O3 for performance
+DEBUG=0
+OPT=-O3
+
+# (optional) Includes FatFS source files within project.
+#USE_FATFS = 1
+
+# Relative to dir 'src'
+LIBDAISY_DIR=../../heck_libDaisyWrong
+DAISYSP_DIR=../../heck_DaisySPWrong
+
+ CXXFLAGS+=-Wall -Wno-unused -Wno-reorder-ctor -Wno-switch
+
+######### Overrides from build.conf #########
+-include $(HERE)build.conf
+
+ifneq (,$(findstring g++,$(CXX)))
+    CXXFLAGS+=-fdiagnostics-color=always
+else ifneq (,$(findstring clang,$(CXX)))
+    CXXFLAGS+=-fcolor-diagnostics
+endif
+
+ifeq ($(DEBUG),1)
+    CXXFLAGS+=-g -O0
+else
+    CXXFLAGS+=-DNDEBUG=1 -O3
+endif

build.conf.example

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+# Build config
+# also, infos for the build system about the dev environment
+
+# TARGET sets the program to compile and flash
+# the name of the main cxx file without the prefix 'main_'
+TARGET=blink
+#TARGET=testtone
+
+DEBUG=0
+
+# Daisy dependencies relative to dir 'src'
+LIBDAISY_DIR=../../heck_libDaisy
+DAISYSP_DIR=../../heck_DaisySP

src/Makefile

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+include ../Makefile.conf
+
+ALL_SRC=$(wildcard *.cc)
+TARGET_SRC=main_$(TARGET).cc
+MODULES_SRC=$(filter-out main_%,$(ALL_SRC))
+CXX_SRC=$(MODULES_SRC) $(TARGET_SRC)
+
+$(info CXXFLAGS: $(CXXFLAGS))
+$(info SOURCES: $(ALL_SRC))
+$(info MODULES: $(MODULES_SRC))
+$(info TARGET_SRC: $(TARGET_SRC))
+$(info CXX_SRC: $(CXX_SRC))
+
+# libDaisy Makefile variables
+CPPFLAGS=$(CXXFLAGS)
+SYSTEM_FILES_DIR=$(LIBDAISY_DIR)/core
+CPP_SOURCES=$(CXX_SRC)
+
+include $(SYSTEM_FILES_DIR)/Makefile