Xcode4 我该如何强制“执行”命令；“违约”；OSX上的_al_mangled_main的可见性？

我得到的错误与下面链接中询问的人相同。答案已经有了，但我该怎么做呢？谢谢你的帮助

edit1）这是代码：

#include "allegro5/allegro.h"
#include "allegro5/allegro_image.h"
#include "allegro5/allegro_native_dialog.h"

int main(){

   ALLEGRO_DISPLAY *display = NULL;
   ALLEGRO_BITMAP  *image   = NULL;

   if(!al_init()) {
      al_show_native_message_box(display, "Error", "Error", "Failed to initialize allegro!", 
                                 NULL, ALLEGRO_MESSAGEBOX_ERROR);
      return 0;
   }

   if(!al_init_image_addon()) {
      al_show_native_message_box(display, "Error", "Error", "Failed to initialize al_init_image_addon!", 
                                 NULL, ALLEGRO_MESSAGEBOX_ERROR);
      return 0;
   }

   display = al_create_display(800,600);

   if(!display) {
      al_show_native_message_box(display, "Error", "Error", "Failed to initialize display!", 
                                 NULL, ALLEGRO_MESSAGEBOX_ERROR);
      return 0;
   }

   image = al_load_bitmap("image.png");

   if(!image) {
      al_show_native_message_box(display, "Error", "Error", "Failed to load image!", 
                                 NULL, ALLEGRO_MESSAGEBOX_ERROR);
      al_destroy_display(display);
      return 0;
   }

   al_draw_bitmap(image,200,200,0);

   al_flip_display();
   al_rest(2);

   al_destroy_display(display);
   al_destroy_bitmap(image);

   return 0;
}

Undefined symbols for architecture x86_64:
  "_al_show_native_message_box", referenced from:
      __al_mangled_main in main.o
  "_al_init_image_addon", referenced from:
      __al_mangled_main in main.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

这些是错误：

#include "allegro5/allegro.h"
#include "allegro5/allegro_image.h"
#include "allegro5/allegro_native_dialog.h"

int main(){

   ALLEGRO_DISPLAY *display = NULL;
   ALLEGRO_BITMAP  *image   = NULL;

   if(!al_init()) {
      al_show_native_message_box(display, "Error", "Error", "Failed to initialize allegro!", 
                                 NULL, ALLEGRO_MESSAGEBOX_ERROR);
      return 0;
   }

   if(!al_init_image_addon()) {
      al_show_native_message_box(display, "Error", "Error", "Failed to initialize al_init_image_addon!", 
                                 NULL, ALLEGRO_MESSAGEBOX_ERROR);
      return 0;
   }

   display = al_create_display(800,600);

   if(!display) {
      al_show_native_message_box(display, "Error", "Error", "Failed to initialize display!", 
                                 NULL, ALLEGRO_MESSAGEBOX_ERROR);
      return 0;
   }

   image = al_load_bitmap("image.png");

   if(!image) {
      al_show_native_message_box(display, "Error", "Error", "Failed to load image!", 
                                 NULL, ALLEGRO_MESSAGEBOX_ERROR);
      al_destroy_display(display);
      return 0;
   }

   al_draw_bitmap(image,200,200,0);

   al_flip_display();
   al_rest(2);

   al_destroy_display(display);
   al_destroy_bitmap(image);

   return 0;
}

Undefined symbols for architecture x86_64:
  "_al_show_native_message_box", referenced from:
      __al_mangled_main in main.o
  "_al_init_image_addon", referenced from:
      __al_mangled_main in main.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

---

edit2）对于使用此代码的记录，一切都很好

Allegro 5是模块化的。经验法则是，如果您使用的是

#include

，则需要链接到相应的库。就你而言：

\u al\u show\u native\u message\u box

：链接到

-lallegro\u native\u对话框

---

\u al_init_image_addon

：链接到

-lallegro_image

您使用的是什么版本的Allegro？如果您使用的是5.0.0以上的版本，这应该不会有问题。事实上，我使用的是5.1（不稳定）分支。甚至尝试了svn的5（稳定）版本（应该是最新的），但仍然是相同的，您应该在问题中包含错误消息的详细信息，以防出现不同的情况。（例如，忘记与-lallegro_main链接）@Matthew：编辑第一条消息以满足您的需要：）