Generic makefile for C projects that follow the "app" + "include" + "source" configuration.

Makefile

# Defines which shell command to use to clean the terminal, depending on the platform. 
ifeq ($(OS), Windows_NT)
	# Clean on Windows
	clean_cmd = @del /s /q *.o > null
else
	# Clean on UNIX systems
	clean_cmd = @rm -f *.o
endif

# A recursive function that allows to list all files with a given extension, in folders and sub-folders, from a given source.
rwildcard=$(wildcard $1$2) $(foreach d,$(wildcard $1*),$(call rwildcard,$d/,$2))

# Name of the generated program
target  := <program name>

# Arguments to be passed to the compiler.
copt_G 		:= -g -Wall	# For debug
copt_O		:= -O3		# For release
cinclude	:= include
cwarns		:= -Wno-unused-function
cflags  	:= $(copt_G) -I$(cinclude) $(cwarns)
export CFLAGS = $(cflags)

# Root and directories
srcroot := source/
approot := app/
objroot := ./obj

# Files of library
lib_src	:= $(call rwildcard,$(srcroot),*.c)
lib_obj := $(patsubst %.c,%.o,$(lib_src))

# Files of application
app_src	:= $(call rwildcard,$(approot),*.c)
app_obj := $(patsubst %.c,%.o,$(app_src))

$(target): $(lib_obj) $(app_obj)
	$(CC) -o $@ $^
	$(info Compilation completed!)

$(objroot)/%.o: %.c
	$(CC) -c $<

clean:
		$(clean_cmd)
all: 	$(target)

.PHONY: all
.SILENT: