用allegro 5和g ++编译C ++代码 [英] Compiling C++ code with allegro 5 and g++

问题描述

为了使用allegro 5编译代码，我需要添加什么标志给g ++？我尝试了

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`

但这不工作。我使用ubuntu 11.04。我使用 http://wiki.allegro.cc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：

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

还有一堆未定义的错误，如：未定义的引用`al_install_system'

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

从SVN在您的系统上安装 allegro5 。您应该知道的一件事是，这个构建不附带 allegro-config 。如果您在系统上安装了它，则表示您之前已安装了 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带来了许多更改，包括不同的初始化过程，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!\n");
      return -1;
   }

   display = al_create_display(640, 480);
   if(!display) {
      fprintf(stderr, "failed to create display!\n");
      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;
}

注意到另一个包括与以前版本的allegro不同的目录和库名称：

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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