在C ++中的不同目录中包含头文件 [英] Include header file in different directory in c++

问题描述

我一直在学习c ++，并遇到以下问题: 我有一个类似的目录结构:

I've been learning c++ and encountered the following question: I have a directory structure like:

 - current directory

  - Makefile

  - include

     - header.h

  - src

      - main.cpp

我的标题.h:

#include <iostream> 

using namespace std;

void print_hello();

我的main.cpp:

#include "header.h"

int main(int argc, char const *argv[])
{
    print_hello();
    return 0;
}

void print_hello()
{
    cout<<"hello world"<<endl;
}

我的Makefile:

CC = g++
OBJ = main.o
HEADER = include/header.h 
CFLAGS = -c -Wall 

hello: $(OBJ) 
    $(CC) $(OBJ) -o $@

main.o: src/main.cpp $(HEADER)
    $(CC) $(CFLAGS) $< -o $@

clean: 
    rm -rf *o hello

make的输出是:

g ++ -c -Wall src/main.cpp -o main.o src/main.cpp:1:20:致命错误:header.h:没有这样的文件或目录 编译终止. Makefile:10:目标"main.o"的配方失败 make:*** [main.o]错误1

g++ -c -Wall src/main.cpp -o main.o src/main.cpp:1:20: fatal error: header.h: No such file or directory compilation terminated. Makefile:10: recipe for target 'main.o' failed make: *** [main.o] Error 1

我在这里犯了什么错误.真令人沮丧非常感谢任何建议！

What mistakes I have made in here. It's frustrating. Really appreciate any advice!

推荐答案

您告诉Makefile必须存在include/header.h，并告诉C ++源文件它需要header.h….但是您没有告诉编译器这些标头在哪里(即在"include"目录中).

You told the Makefile that include/header.h must be present, and you told the C++ source file that it needs header.h … but you did not tell the compiler where such headers live (i.e. in the "include" directory).

执行此操作:

CFLAGS = -c -Wall -Iinclude

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