如何在C Makefile中使用外部库和头文件? [英] How to use external libraries and headers in C Makefile?

问题描述

我在目录1中有一个头文件myheader.h和一个静态库libmylib.a.在directory2中，我正在编写一个使用它们的程序.假设我在目录2中有main.c，该目录使用myheader.h和libmylib.a.如何创建Makefile进行编译和链接?

I have a header file myheader.h and a static library libmylib.a file in directory1. In directory2, I'm writing a program which uses them. Suppose I have main.c in directory2 which uses myheader.h and libmylib.a. How do I create a Makefile to compile and link them?

现在，在我的main.c中，我已经添加

Right now, in my main.c, I have added

#include "../directory1/myheader.h"

此刻是我的Makefile:

Here's my Makefile at the moment:

CC = gcc

INCLUDES = -I

CFLAGS = -g -Wall $(INCLUDES)

main: main.o ../directory1/libmylib.a
    $(CC) main.o ../directory1/libmylib.a -o main

main.o: main.c ../directory1/myheader.h
    $(CC) $(CFLAGS) -c main.c

我收到以下警告:

gcc -g -Wall -I -c main.c
/home/me/directory2/main.c:72: undefined reference to `foo'
collect2: ld returned 1 exit status
make: *** [main.o] Error 1

其中foo是库中的功能之一.

where foo is one of the functions in the library.

推荐答案

好.修复它.

我删除了 #include"../directory1/myheader.h" ，并将其替换为 #include"myheader.h" .

I removed #include "../directory1/myheader.h" and replaced it with #include "myheader.h".

然后在Makefile中使用:

Then in the Makefile, I used:

CC = gcc

INCLUDES = -I../directory1

CFLAGS = -g -Wall $(INCLUDES)

LDFLAGS = -L../directory1

main: main.o ../directory1/libmylib.a
    $(CC) main.o $(LDFLAGS) -lmylib -o main

main.o: main.c ../directory1/myheader.h
    $(CC) $(CFLAGS) -c main.c

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