学习makefile [英] Learning makefiles

问题描述

我正在尝试学习Makefile.我必须为我的Unix管理/编程类做一个分配，该分配涉及为三个文件创建一个makefile:Savings.h Savings.cpp和SavingsTest.cpp.我的老师对Makefile的解释并不多.我看了我的书后，就了解了总体思路，但是语法上却遇到了麻烦.我按照我的书中的示例进行操作，但出现错误.到目前为止，这是我的makefile代码:

I am trying to learn makefiles. I have to do an assignment for my Unix admin/programming class that involves creating a makefile for three files: savings.h savings.cpp and savingsTest.cpp. My teacher didn't really explain much to us about makefiles. I looked in my book and I understand the general idea but I am having trouble with the syntax. I followed the example my book has but I get an error. Here is my code for the makefile so far:

 savingsTest.0:  savingsTest.cpp savings.cpp savings.h
                 cc -c savingsTest.cpp

 savings.o:  savings.cpp savings.h
             cc -c savings.cpp

这是我得到的错误:

  cc -c savingsTest.cpp
  cc: No input file specified, no output generated
  *** Error code 1
  make: Fatal error: Command failed for target `savingsTest'
  v245-2% emacs makefile.txt

有人可以帮助我理解语法，以便确定我做错了什么.谢谢任何响应我们的人.

Can somebody please help me understand the syntax so I can determine what I am doing wrong. Thank you to anybody that responds to help.

推荐答案

您需要整理出C ++编译器的名称.我要假设它是CC，但是还有很多其他名称(例如g++).

You need to sort out the name of your C++ compiler. I'm about to assume it is CC, but there are lots of other names (g++ for instance).

您的程序savingsTest.0依赖于两个目标文件:savings.o和savingsTest.o. savings.o文件取决于savings.cpp和savings.h. savingsTest.o文件取决于savingsTest.cpp和savings.h.

Your program savingsTest.0 depends on two object files: savings.o and savingsTest.o. The savings.o file depends on savings.cpp and savings.h. The savingsTest.o file depends on savingsTest.cpp and savings.h.

全部写为:

savingsTest.0: savings.o savingsTest.o
        CC -o $@ savings.o savingsTest.o

savingsTest.o: savingsTest.cpp savings.h
        CC -c savingsTest.cpp
savings.o: savings.cpp savings.h
        CC -c savings.cpp

您可能会省略最后两个命令行； make知道如何将.cpp编译为.o.

You could probably leave out the last two command lines; make knows how to compile a .cpp to .o.

您将学习如何在makefile中使用宏. $@是要构建的程序或文件的名称(因此它是savingsTest.0的简写).有理由使用它-尤其是，不要重复自己.

You'll learn to use macros in your makefile. $@ is the name of the program or file being built (so it is a shorthand for savingsTest.0). There are reasons to use it — notably, don't repeat yourself.

通常应将宏用于命令和命令参数，库以及文件列表.

You should normally use macros for commands and command arguments, for libraries, and for lists of files.

这篇关于学习makefile的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！