The orignial is from github.
https://gist.github.com/mauriciopoppe/de8908f67923091982c8c8136a063ea6
CXX ?= g++
# path #
SRC_PATH = src
BUILD_PATH = build
BIN_PATH = $(BUILD_PATH)/bin
# executable #
BIN_NAME = DemoPanel
# extensions #
SRC_EXT = cpp
# code lists #
# Find all source files in the source directory, sorted by
# most recently modified
SOURCES = $(shell find $(SRC_PATH) -name '*.$(SRC_EXT)' | sort -k 1nr | cut -f2-)
# Set the object file names, with the source directory stripped
# from the path, and the build path prepended in its place
OBJECTS = $(SOURCES:$(SRC_PATH)/%.$(SRC_EXT)=$(BUILD_PATH)/%.o)
# Set the dependency files that will be used to add header dependencies
DEPS = $(OBJECTS:.o=.d)
# flags #
COMPILE_FLAGS = -std=c++17 -Wall -Wextra -g
INCLUDES = -I inc/ -I /usr/include/c++/7/
# Space-separated pkg-config libraries used by this project
LIBS =
.PHONY: default_target
default_target: release
.PHONY: release
release: export CXXFLAGS := $(CXXFLAGS) $(COMPILE_FLAGS)
release: dirs
@$(MAKE) all
.PHONY: dirs
dirs:
@echo "Creating directories"
@mkdir -p $(dir $(OBJECTS))
@mkdir -p $(BIN_PATH)
.PHONY: clean
clean:
@echo "Deleting $(BIN_NAME) symlink"
@$(RM) $(BIN_NAME)
@echo "Deleting directories"
@$(RM) -r $(BUILD_PATH)
@$(RM) -r $(BIN_PATH)
# checks the executable and symlinks to the output
.PHONY: all
all: $(BIN_PATH)/$(BIN_NAME)
@echo "Making symlink: $(BIN_NAME) -> $<"
@$(RM) $(BIN_NAME)
@ln -s $(BIN_PATH)/$(BIN_NAME) $(BIN_NAME)
# Creation of the executable
$(BIN_PATH)/$(BIN_NAME): $(OBJECTS)
@echo "Linking: $@"
$(CXX) $(OBJECTS) -o $@ ${LIBS}
# Add dependency files, if they exist
-include $(DEPS)
# Source file rules
# After the first compilation they will be joined with the rules from the
# dependency files to provide header dependencies
$(BUILD_PATH)/%.o: $(SRC_PATH)/%.$(SRC_EXT)
@echo "Compiling: $< -> $@"
$(CXX) $(CXXFLAGS) $(INCLUDES) -MP -MMD -c $< -o $@