General-purpose Makefile for C++ programs

Makefile

CXX = g++
LINKER = g++
AR = ar cr
LINKER_SO = g++ -shared

# package name
PACKAGE = $(shell basename $(shell pwd))

# platform
PLATFORM = $(shell uname -s)

# Windows MinGW identifier
ifeq ($(PLATFORM), MINGW32_NT-5.1)
	WIN32 = yes
endif
ifeq ($(PLATFORM), MINGW32_NT-6.1)
	WIN32 = yes
endif

# configuration
CONFIGURATION ?= debug
# debug
ifeq ($(CONFIGURATION), debug)
	CXXFLAGS = -g -O0 -Wall -Wextra
	LDFLAGS = -g
	CPPFLAGS = -DDEBUG
endif
# release
ifeq ($(CONFIGURATION), release)
	CXXFLAGS = -O2 -Wall -Wextra -flto
	LDFLAGS = -O2 -flto -fuse-linker-plugin
endif

# output and temporary directories
BIN_DIR = bin/$(CONFIGURATION)
OBJ_DIR = obj/$(CONFIGURATION)

# package specific settings
-include Makefile.$(PACKAGE)
-include Makefile.$(PACKAGE).$(PLATFORM)

# output target mode
MODE ?= exe
# executable
ifeq ($(MODE), exe)
	BIN = $(PACKAGE)
	ifdef WIN32
		BIN = $(PACKAGE).exe
	endif
endif
# static library
ifeq ($(MODE), lib)
	BIN = lib$(PACKAGE).a
endif
# shared object
ifeq ($(MODE), shared_obj)
	ifdef WIN32
		BIN = $(PACKAGE).dll
	else
		BIN = lib$(PACKAGE).so
		CXXFLAGS += -fPIC
	endif
endif

OUTPUT = $(BIN_DIR)/$(BIN)

# list of source files
SRC = $(wildcard *.cpp)
SRC += $(wildcard $(addsuffix /*.cpp, $(MODULES)))

# list of header files
HEADERS = $(wildcard *.h)
HEADERS += $(wildcard $(addsuffix /*.h, $(MODULES)))

OBJ = $(addprefix $(OBJ_DIR)/, $(SRC:.cpp=.o))
OBJ_SUBDIRS = $(addprefix $(OBJ_DIR)/, $(MODULES))

.PHONY: all clean

all: $(OUTPUT)

$(OUTPUT): $(OBJ) | $(BIN_DIR)
	@echo "Package: $(PACKAGE)"
	@echo "Configuration: $(CONFIGURATION)"
	@echo "Platform: $(PLATFORM)"
	@echo "Mode: $(MODE)"
# executable
ifeq ($(MODE), exe)
	$(LINKER) $(LDFLAGS) -o $@ $(OBJ) $(LIBS)
endif
# static library
ifeq ($(MODE), lib)
	$(AR) $@ $(OBJ)
endif
# shared object
ifeq ($(MODE), shared_obj)
	$(LINKER_SO) $(LDFLAGS) -o $@ $(OBJ) $(LIBS)
endif
	@echo "Finished building target: $@"

# external references
$(OUTPUT): $(REFS)

# compilation
$(OBJ_DIR)/%.o: %.cpp
	@echo "Compiling: $<"
	$(CXX) $(CXXFLAGS) $(CPPFLAGS) $(INCLUDES) -o $@ -c $<

# recompile if any header was changed
$(OBJ): $(HEADERS)

# list of all directories without duplicates
DIRS = $(sort $(OBJ_DIR) $(OBJ_SUBDIRS) $(BIN_DIR))

# make directories
$(DIRS):
	mkdir -p $@

$(OBJ): | $(OBJ_DIR) $(OBJ_SUBDIRS)
$(OBJ_SUBDIRS): | $(OBJ_DIR)

clean:
	rm -f $(OBJ) $(OUTPUT)