自动编译目标文件时，如何使我的Makefile使用CFLAGS标志？

Question

I have a Makefile for this game I'm making. It looks like this.

 CC = g++
 CFLAGS = -std=c++11 -w

 game: main.o item.o game.o player.o map.o room.o menu.o notebook.o enemy.o  
   $(CC) $(CFLAGS) -o game main.o item.o game.o player.o map.o room.o menu.o notebook.o enemy.o
   mv game ../

I am using the -std=c++11 line in the CFLAGS line, however, when I run make , I am told that I need to use C++11 since I am using the #include <random> line in one of my files. I hadn't noticed the compilation wasn't always using the CFLAGS line when compiling until this.

What do I need to do in order to make the automatic compilation of the object files use the CFLAGS also?

Answer 1

Specify how to generate your .o files:

%.o: %.c
    $(CC) $(CFLAGS) -c $< -o $@

As @juanchopanza mentions, you should really be using CXX and CXXFLAGS .