Allegro在Ubuntu中：未定义引用`al_install_system' [英] Allegro in Ubuntu: undefined reference to `al_install_system'

问题描述

我试图安装Allegro库。我有相同的C ++经验，但似乎我没有做这样的东西。我从源编译Allegro 5.0，并将其放在/usr/lib/gcc/i486-linux-gnu/4.4/include/allegro5中。但是当我尝试编译我的代码时，会出现：

 > g ++ test2.cc -o test2 
 /home/chris/Desktop/c++/test2/.objs/main.o||函数`main'：| 
 main.cpp :(。text + 0x22）||未定义引用`al_install_system'| 
 main.cpp :(。text + 0x3e）||未定义引用`al_create_display'| 
 main.cpp :(。text + 0x6b）||未定义引用`al_map_rgb'| 
 main.cpp :(。text + 0x8e）|| undefined reference to`al_clear_to_color'| 
 main.cpp :(。text + 0x93）||未定义引用`al_flip_display'| 
 main.cpp :(。text + 0xa1）||未定义引用`al_rest'| 
 main.cpp :(。text + 0xa9）|| undefined reference to`al_destroy_display'| 
 || === Build finished：7 errors，0 warnings === | 
  

我使用的代码：

  #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，无法创建显示！\\\
）; 
 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; 
} 
  

allegro-config --libs 不返回任何内容。

解决方案

您需要链接到Allegro库，

allegro-config --libs

有问题的一部分。通常，您应该能够将其添加到命令行，如下所示：

  g ++`allegro-config --libs`在我的系统（Ubuntu 10.10）上，它提供了这个：
 
  $ allegro-config --libs 
 -L ​​/ usr / lib -Wl，-Bsymbolic-functions -lalleg-4.2.2 
  
正在调用正确的 allegro-config  ？也许你应该指定它的完整路径？
 
I tried installing the Allegro library today. I have same experience in C++, but it seems I have none in doing stuff like that. I have compiled Allegro 5.0 from source and put it in /usr/lib/gcc/i486-linux-gnu/4.4/include/allegro5. But when I try to compile my code, this comes up:
    > g++ test2.cc -o test2
/home/chris/Desktop/c++/test2/.objs/main.o||In function `main':|
main.cpp:(.text+0x22)||undefined reference to `al_install_system'|
main.cpp:(.text+0x3e)||undefined reference to `al_create_display'|
main.cpp:(.text+0x6b)||undefined reference to `al_map_rgb'|
main.cpp:(.text+0x8e)||undefined reference to `al_clear_to_color'|
main.cpp:(.text+0x93)||undefined reference to `al_flip_display'|
main.cpp:(.text+0xa1)||undefined reference to `al_rest'|
main.cpp:(.text+0xa9)||undefined reference to `al_destroy_display'|
||=== Build finished: 7 errors, 0 warnings ===|
The code I am using:
#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;
}
allegro-config --libs returns nothing. I had Allegro as package first, but it didn'T work either.
解决方案
You need to link with the Allegro libraries, but you don't seem to do so.

  
allegro-config --libs returns nothing.
There's part of your problem. Normally, you should be able to add it to your command line, like so:
g++ `allegro-config --libs` test2.cc -o test2
On my system (Ubuntu 10.10) it gives this:
$ allegro-config --libs
-L/usr/lib -Wl,-Bsymbolic-functions -lalleg-4.2.2
Are you invoking the right allegro-config? Maybe you should specify the full path to it?

                        
这篇关于Allegro在Ubuntu中：未定义引用`al_install_system'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！