使用 allegro 5 和 g++ 编译 C++ 代码

2022-01-23 00:00:00 g++ c++ allegro allegro5

为了使用 allegro 5 编译代码，我需要向 g++ 添加哪些标志?我试过了

What flags do I need to add to g++ in order to compile code using allegro 5? I tried

g++ allegro5test.cpp -o allegro5test `allegro-config --libs`

但这不起作用.我正在使用 ubuntu 11.04.我使用 http://wiki.allegro.cc 中的说明安装了 allegro 5/index.php?title=Install_Allegro5_From_SVN/Linux/Debian

but that is not working. I'm using ubuntu 11.04. I installed allegro 5 using the instructions at http://wiki.allegro.cc/index.php?title=Install_Allegro5_From_SVN/Linux/Debian

我试过了:

g++ allegro5test.cpp -o allegro5test `allegro-config --cflags --libs`

而且它还给出了一堆未定义的错误，例如:未定义的对 `al_install_system' 的引用

And it also gives a bunch of undefined errors, like: undefined reference to `al_install_system'

allegro-config --cflags --libs 输出:

-I/usr/local/include
-L/usr/local/lib -lalleg

推荐答案

这样您就成功地从 SVN 将 allegro5 安装到了您的系统上.您应该知道的一件事是，此版本不附带 allegro-config.如果您的系统上有它，则表示您以前安装了 allegro4.

So you successfully installed allegro5 on your system from the SVN. One thing you should know is that this build doesn't come with allegro-config. If you have it on your system it means you have previously installed allegro4.

allegro5 带来了很多变化，包括不同的初始化程序、库和函数名称.

allegro5 brings many changes, including different initialization procedures, library and function names.

这是一个新版本的 hello world 应用程序:

Here's a hello world application for new version:

#include <stdio.h>
#include <allegro5/allegro.h>

int main(int argc, char **argv)
{
   ALLEGRO_DISPLAY *display = NULL;

   if(!al_init()) {
      fprintf(stderr, "failed to initialize allegro!
");
      return -1;
   }

   display = al_create_display(640, 480);
   if(!display) {
      fprintf(stderr, "failed to create display!
");
      return -1;
   }

   al_clear_to_color(al_map_rgb(0,0,0));
   al_flip_display();
   al_rest(10.0);
   al_destroy_display(display);
   return 0;
}

注意编译此应用程序的命令如何引用另一个包含目录和库名称，这与之前版本的 allegro 不同:

Notice how the command to compile this application refers to another include directory and library names, which are different from the previous version of allegro:

g++ hello.cpp -o hello -I/usr/include/allegro5 -L/usr/lib -lallegro

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