编辑源文件后，"make"不会重新编译 [英] 'make' does not recompile when source file has been edited

问题描述

我正在用C写一些Conway的《生命游戏》的实现.源代码分为三个文件:main.c和functions.c/functions.h，在其中放置函数定义和声明.

现在，要创建一个单元格网格，我有一个这种类型的矩阵:

Cell grid[GRID_HEIGHT][GRID_WIDTH];

其中GRID_HEIGHT和GRID_WIDTH是在functions.h中定义的常量:

#define GRID_HEIGHT 10
#define GRID_WIDTH 10

程序运行正常，使用make和Makefile编译.但是问题是:如果我尝试更改GRID_HEIGHT或GRID_WIDTH，当我再次运行我的Makefile时，它说所有文件都是最新的！ 我尝试使用良好的方法gcc main.c etc.进行编译，它可以正常运行.那么，为什么make不重新编译源代码?

这是我的Makefile:

CC = gcc
OBJECTS = main.o functions.o

Game\ of\ Life : $(OBJECTS)
    $(CC) $(OBJECTS) -o Game\ of\ Life -lncurses

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

解决方案

因为您尚未告诉我们重新编译取决于functions.h.

尝试将其添加到您的Makefile中:

%.o : functions.h

或者，将现有规则修改为:

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

I'm writing a little implementation of Conway's Game of Life in C. The source code is split in three files: main.c and functions.c/functions.h, where I put my functions definitions and declarations.

Now, to create a grid of cell, I have a matrix of this type:

Cell grid[GRID_HEIGHT][GRID_WIDTH];

where GRID_HEIGHT and GRID_WIDTH are constants defined in functions.h:

#define GRID_HEIGHT 10
#define GRID_WIDTH 10

The program runs fine, compiled with make and Makefile. But the problem is: if I try to change GRID_HEIGHT or GRID_WIDTH, when I run again my Makefile it says that all files are up-to-date! I've tried to compile using the good ol' way gcc main.c etc. and it runs as it should. So, why make does not recompile the source?

This is my Makefile:

CC = gcc
OBJECTS = main.o functions.o

Game\ of\ Life : $(OBJECTS)
    $(CC) $(OBJECTS) -o Game\ of\ Life -lncurses

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

解决方案

Because you haven't told it that recompilation depends on functions.h.

Try adding this to your Makefile:

%.o : functions.h

Alternatively, modify your existing rule to be:

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

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