GNU将所有.cpp文件编译为.o并包含.h文件

Question

So i have folder that looks like this

OS
  Makefile
  /include
    head.h
  /src
    main.cpp
    head.cpp
  /objects

How can i use Makefile to compile all .cpp files to objects folder then compile all .o files with include .h to my actual cpp program.I currently have:

CPP_FILES := $(wildcard src/*.cpp)
H_FILES := $(wildcard include/*.h)
OBJ :=$(wildcard objects/*.o)
LIBS := -Wall
CC := -std=c++14

What do I enter next to make all those .cpp files to .o and compile them with .h included.Thank you for your time

Answer 1

You can use pattern rules (previously known as "suffix rules") for that. As you use GNU make, you can write this line to compile all .cpp files in src/ to .o files in objects/ , assuming the Makefile is placed in the top directory:

objects/%.o: src/%.cpp
    $(CXX) -c $(CFLAGS) $< -o $@

In GNU make syntax $< denotes the dependency (a .cpp file in this case), $@ denotes the target (the object file).

The .h files do not need to be compiled, just set up the correct include path as part of the string the CFLAGS variable contains:

 CFLAGS += -I./include