A generic Makefile based on https://spin.atomicobject.com/2016/08/26/makefile-c-projects

Makefile

TARGET ?= a.out
SRC_DIRS ?= .

SRCS := $(shell find $(SRC_DIRS) -name '*.cpp' -or -name '*.c')
OBJS := $(addsuffix .o,$(basename $(SRCS)))
DEPS := $(OBJS:.o=.d)

INC_DIRS := $(shell find $(SRC_DIRS) -type d -not -path '*/.*')
INC_FLAGS := $(addprefix -I,$(INC_DIRS))

CPPFLAGS ?= $(INC_FLAGS) -MMD -MP -Wall -g -std=c++17
LDFLAGS  := -pthread -lm

$(TARGET): $(OBJS)
        $(CXX) $(LDFLAGS) $(OBJS) -o $@ $(LDLIBS)
        $(RM) $(OBJS) $(DEPS)

.PHONY: clean
clean:
        $(RM) $(TARGET) $(OBJS) $(DEPS)

-include $(DEPS)