最近在调试OJ, 忙了4天多, 最后的问题是judge模块不能正常工作.
judge 模块就是两个C++源文件, 它的工作是
- 从数据库获取用户提交的源码
- 测评
- 将测评结果写到数据库
测评部分是与数据库无关的, 我遇到的问题是C++和数据库无法建立连接.
这个问题根源于我用的是LAMPP的集成版, 而文档里是分别安装Apace, MySQL, 和PHP的.
这两种方式下, 某些库文件, 比如mysql.h和libmysqlclient.so, 的位置是不同的, 因而需要调整的有
- 源码
- makefile文件
我对下列两大块内容都很不熟悉, 导致调试过程进展很慢
- Linux的文件系统, CLI基础
- build 源码的过程
暑假做OpenCV人脸识别项目时, 就发现这两个问题, 但事后没有仔细研究 (太懒). 下面要努力学习这些知识
这篇随笔开个头, 搜集一些关于 Make 的知识.
(以下内容参考 GNU Make Manual)
(GNU Make is a version of Make)
GNU Make is a tool which controls the generation of executables and other non-source files of a program from the program's source files.
Make gets its knowledge of how to build your program from a file called the makefile, which lists each of the non-source files and how to compute it from other files. When you write a program, you should write a makefile for it, so that it is possible to use Make to build and install the program.
In a program, typically, the executable file is updated from object files, which are in turn made by compiling source files.