Allegro 5.0 library woes T_T

This is a discussion on Allegro 5.0 library woes T_T within the Game Programming forums, part of the General Programming Boards category; Hello All, I'm on Arch Linux and if you don't know about Arch, it has a wicked awesome package manager ...

  1. #1
    Registered User MutantJohn's Avatar
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    Allegro 5.0 library woes T_T

    Hello All,

    I'm on Arch Linux and if you don't know about Arch, it has a wicked awesome package manager so all I did was type "pacman -S allegro" and voila, allegro was installed.

    So, this code works :
    Code:
       ALLEGRO_DISPLAY *display = NULL;
    
    
       if (!al_init()) {
    
    
          fprintf(stderr, "failed to initialize allegro!\n");
          return 1;
       }
    but if I try to use install_keyboard() or anything else, the compiler tells me that it can't find what I want it to.

    Here's my compilation line :
    Code:
    gcc -g -O3 -Wall -Wextra `pkg-config --cflags --libs allegro-5.0 allegro_monolith-5.0` -std=c11
    The monolith one was tacked on because I thought it might matter but it doesn't. How do I get this code to work because this is driving me nuts.

  2. #2
    Registered User ledow's Avatar
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    You need to provide more info.

    Specifically: "the compiler tells me that it can't find what I want it to"... and will have produced a lovely error that tells us exactly what it was after and where it looked.
    - Also, we need to know that you're including the right headers in your code. Seeing the relevant bits of your code might help there too.
    - Does pacman install allegro development headers as well as the library? I can't tell without having it installed but on most distros they are two separate packages (one that lets you USE Allegro in pre-compiled programs, one that lets you MAKE Allegro programs from source).
    - What's your include path generated from pkg-config? What's in that folder? Are the includes you need in there? If not, what does a search for those include files produce (i.e. are they somewhere else)?

    All pretty standard questions to ask yourself, really.

    - Compiler warnings are like "Bridge Out Ahead" warnings. DON'T just ignore them.
    - A compiler error is something SO stupid that the compiler genuinely can't carry on with its job. A compiler warning is the compiler saying "Well, that's bloody stupid but if you WANT to ignore me..." and carrying on.
    - The best debugging tool in the world is a bunch of printf()'s for everything important around the bits you think might be wrong.

  3. #3
    Registered User MutantJohn's Avatar
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    Fair enough, here's my source code :
    Code:
    #include <stdio.h>
    #include <allegro5/allegro.h>
    
    
    int main(void) {
    
    
       ALLEGRO_DISPLAY *display = NULL;
    
    
       if (!al_init()) {
    
    
          fprintf(stderr, "failed to initialize allegro!\n");
          return 1;
       }
    
    
       install_keyboard();
    
    
       return 0;
    }
    And I get the following errors,

    main.c.text+0x1b): undefined reference to `al_install_system'
    main.c.text+0x51): undefined reference to `install_keyboard'

    And here's everything Arch Linux installed (taken from https://www.archlinux.org/packages/c...86_64/allegro/),

    Package Contents

    • usr/
    • usr/include/
    • usr/include/allegro5/
    • usr/include/allegro5/alcompat.h
    • usr/include/allegro5/alinline.h
    • usr/include/allegro5/allegro.h
    • usr/include/allegro5/allegro5.h
    • usr/include/allegro5/allegro_acodec.h
    • usr/include/allegro5/allegro_audio.h
    • usr/include/allegro5/allegro_color.h
    • usr/include/allegro5/allegro_direct3d.h
    • usr/include/allegro5/allegro_font.h
    • usr/include/allegro5/allegro_image.h
    • usr/include/allegro5/allegro_memfile.h
    • usr/include/allegro5/allegro_native_dialog.h
    • usr/include/allegro5/allegro_opengl.h
    • usr/include/allegro5/allegro_physfs.h
    • usr/include/allegro5/allegro_primitives.h
    • usr/include/allegro5/allegro_ttf.h
    • usr/include/allegro5/altime.h
    • usr/include/allegro5/base.h
    • usr/include/allegro5/bitmap.h
    • usr/include/allegro5/bitmap_draw.h
    • usr/include/allegro5/bitmap_io.h
    • usr/include/allegro5/bitmap_lock.h
    • usr/include/allegro5/blender.h
    • usr/include/allegro5/color.h
    • usr/include/allegro5/config.h
    • usr/include/allegro5/debug.h
    • usr/include/allegro5/display.h
    • usr/include/allegro5/drawing.h
    • usr/include/allegro5/error.h
    • usr/include/allegro5/events.h
    • usr/include/allegro5/file.h
    • usr/include/allegro5/fixed.h
    • usr/include/allegro5/fmaths.h
    • usr/include/allegro5/fshook.h
    • usr/include/allegro5/fullscreen_mode.h
    • usr/include/allegro5/inline/
    • usr/include/allegro5/inline/fmaths.inl
    • usr/include/allegro5/internal/
    • usr/include/allegro5/internal/alconfig.h
    • usr/include/allegro5/joystick.h
    • usr/include/allegro5/keyboard.h
    • usr/include/allegro5/keycodes.h
    • usr/include/allegro5/memory.h
    • usr/include/allegro5/monitor.h
    • usr/include/allegro5/mouse.h
    • usr/include/allegro5/mouse_cursor.h
    • usr/include/allegro5/opengl/
    • usr/include/allegro5/opengl/GLext/
    • usr/include/allegro5/opengl/GLext/gl_ext_alias.h
    • usr/include/allegro5/opengl/GLext/gl_ext_api.h
    • usr/include/allegro5/opengl/GLext/gl_ext_defs.h
    • usr/include/allegro5/opengl/GLext/gl_ext_list.h
    • usr/include/allegro5/opengl/GLext/glx_ext_alias.h
    • usr/include/allegro5/opengl/GLext/glx_ext_api.h
    • usr/include/allegro5/opengl/GLext/glx_ext_defs.h
    • usr/include/allegro5/opengl/GLext/glx_ext_list.h
    • usr/include/allegro5/opengl/GLext/wgl_ext_alias.h
    • usr/include/allegro5/opengl/GLext/wgl_ext_api.h
    • usr/include/allegro5/opengl/GLext/wgl_ext_defs.h
    • usr/include/allegro5/opengl/GLext/wgl_ext_list.h
    • usr/include/allegro5/opengl/gl_ext.h
    • usr/include/allegro5/path.h
    • usr/include/allegro5/platform/
    • usr/include/allegro5/platform/albcc32.h
    • usr/include/allegro5/platform/aliphone.h
    • usr/include/allegro5/platform/aliphonecfg.h
    • usr/include/allegro5/platform/almngw32.h
    • usr/include/allegro5/platform/almsvc.h
    • usr/include/allegro5/platform/alosx.h
    • usr/include/allegro5/platform/alosxcfg.h
    • usr/include/allegro5/platform/alplatf.h
    • usr/include/allegro5/platform/alucfg.h
    • usr/include/allegro5/platform/alunix.h
    • usr/include/allegro5/platform/alwatcom.h
    • usr/include/allegro5/platform/alwin.h
    • usr/include/allegro5/platform/astdbool.h
    • usr/include/allegro5/platform/astdint.h
    • usr/include/allegro5/system.h
    • usr/include/allegro5/threads.h
    • usr/include/allegro5/timer.h
    • usr/include/allegro5/tls.h
    • usr/include/allegro5/transformations.h
    • usr/include/allegro5/utf8.h
    • usr/lib/
    • usr/lib/liballegro.so
    • usr/lib/liballegro.so.5.0
    • usr/lib/liballegro.so.5.0.10
    • usr/lib/liballegro_acodec.so
    • usr/lib/liballegro_acodec.so.5.0
    • usr/lib/liballegro_acodec.so.5.0.10
    • usr/lib/liballegro_audio.so
    • usr/lib/liballegro_audio.so.5.0
    • usr/lib/liballegro_audio.so.5.0.10
    • usr/lib/liballegro_color.so
    • usr/lib/liballegro_color.so.5.0
    • usr/lib/liballegro_color.so.5.0.10
    • usr/lib/liballegro_dialog.so
    • usr/lib/liballegro_dialog.so.5.0
    • usr/lib/liballegro_dialog.so.5.0.10
    • usr/lib/liballegro_font.so
    • usr/lib/liballegro_font.so.5.0
    • usr/lib/liballegro_font.so.5.0.10
    • usr/lib/liballegro_image.so
    • usr/lib/liballegro_image.so.5.0
    • usr/lib/liballegro_image.so.5.0.10
    • usr/lib/liballegro_main.so
    • usr/lib/liballegro_main.so.5.0
    • usr/lib/liballegro_main.so.5.0.10
    • usr/lib/liballegro_memfile.so
    • usr/lib/liballegro_memfile.so.5.0
    • usr/lib/liballegro_memfile.so.5.0.10
    • usr/lib/liballegro_physfs.so
    • usr/lib/liballegro_physfs.so.5.0
    • usr/lib/liballegro_physfs.so.5.0.10
    • usr/lib/liballegro_primitives.so
    • usr/lib/liballegro_primitives.so.5.0
    • usr/lib/liballegro_primitives.so.5.0.10
    • usr/lib/liballegro_ttf.so
    • usr/lib/liballegro_ttf.so.5.0
    • usr/lib/liballegro_ttf.so.5.0.10
    • usr/lib/pkgconfig/
    • usr/lib/pkgconfig/allegro-5.0.pc
    • usr/lib/pkgconfig/allegro-5.pc
    • usr/lib/pkgconfig/allegro_acodec-5.0.pc
    • usr/lib/pkgconfig/allegro_acodec-5.pc
    • usr/lib/pkgconfig/allegro_audio-5.0.pc
    • usr/lib/pkgconfig/allegro_audio-5.pc
    • usr/lib/pkgconfig/allegro_color-5.0.pc
    • usr/lib/pkgconfig/allegro_color-5.pc
    • usr/lib/pkgconfig/allegro_dialog-5.0.pc
    • usr/lib/pkgconfig/allegro_dialog-5.pc
    • usr/lib/pkgconfig/allegro_font-5.0.pc
    • usr/lib/pkgconfig/allegro_font-5.pc
    • usr/lib/pkgconfig/allegro_image-5.0.pc
    • usr/lib/pkgconfig/allegro_image-5.pc
    • usr/lib/pkgconfig/allegro_main-5.0.pc
    • usr/lib/pkgconfig/allegro_main-5.pc
    • usr/lib/pkgconfig/allegro_memfile-5.0.pc
    • usr/lib/pkgconfig/allegro_memfile-5.pc
    • usr/lib/pkgconfig/allegro_physfs-5.0.pc
    • usr/lib/pkgconfig/allegro_physfs-5.pc
    • usr/lib/pkgconfig/allegro_primitives-5.0.pc
    • usr/lib/pkgconfig/allegro_primitives-5.pc
    • usr/lib/pkgconfig/allegro_ttf-5.0.pc
    • usr/lib/pkgconfig/allegro_ttf-5.pc
    • usr/share/
    • usr/share/licenses/
    • usr/share/licenses/allegro/
    • usr/share/licenses/allegro/LICENSE






  4. #4
    Registered User MutantJohn's Avatar
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    Oh wow, I'm a moron. Turns out, the name of function was changed from the stupid tutorial I was using and it's really,
    Code:
    al_install_keyboard();
    Oh wow, I feel special now T_T

  5. #5
    Registered User MutantJohn's Avatar
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    Okay, so now I have a better understanding of how to use such complex libraries and while it may be kewl in theory, it's very lame in practice. I found this example code online but I can't get it to work (from cppgameprogramming.com &bull; View topic - hello world allegro 5)

    main.c :
    Code:
    #include <allegro5/allegro5.h>
    //#include <allegro5/allegro_image.h>
    //#include <allegro5/allegro_primitives.h>
    //#include <allegro5/allegro_color.h>
    #include <allegro5/allegro_font.h>
    #include <allegro5/allegro_ttf.h>
    //#include <allegro5/allegro_audio.h>
    //#include <allegro5/allegro_acodec.h>
    //#include <allegro5/allegro_memfile.h>
    //#include <allegro5/allegro_physfs.h>
    //#include <allegro5/allegro_native_dialog.h>
    
    
    #include <cstdio>
    
    
    
    
    void init(ALLEGRO_EVENT_QUEUE* &e_queue, int w, int h, int full=0, int opengl=1)
    {
       if(full) al_set_new_display_flags(ALLEGRO_FULLSCREEN);
       if(opengl) al_set_new_display_flags(ALLEGRO_OPENGL);
    
    
       ALLEGRO_DISPLAY* display = al_create_display(w,h); //it doesn't need to be global because you can always access it by al_get_current_display();
       if(!display) printf("ERROR INITIALIZING THE DISPLAY AT %i %i!",w,h);
    
    
       e_queue = al_create_event_queue();
       if(!e_queue) printf("ERROR CREATING EVENT QUEUE!");
    
    
       al_register_event_source(e_queue, al_get_display_event_source(display));
       //al_register_event_source(e_queue, al_get_mouse_event_source());
       al_register_event_source(e_queue, al_get_keyboard_event_source());
       //al_register_event_source(e_queue, al_get_joystick_event_sourc());
    }
    
    
    int install_allegro()
    {
       if(!al_init())
       {
          printf("ERROR INITIALIZING ALLEGRO!");
          return 0;
       }
       if(!al_install_keyboard())
       {
          printf("ERROR INITIALIZING KEYBOARD!");
          return 0;
       }
    
    
       /*if(!al_install_mouse())
       {
          printf("ERROR INITIALIZING MOUSE!");
          return 0;
       }
       if(!al_install_joystick())
       {
           printf("ERROR INITIALIZING JOYSTICK!");
           return 0;
       }
       */
       /*
       if(!al_init_image_addon())
       {
          printf("ERROR INITIALIZING IMAGE ENGINE!");
          return 0;
       }
       if(!al_init_primitives_addon())
       {
          printf("ERROR INITIALIZING PRIMITIVES ADDON!");
       }
       */
       al_init_font_addon();
    
    
       if(!al_init_ttf_addon())
       {
          printf("ERROR INITIALIZING FONT ENGINE!\n");
          return 0;
       }
       /*
       if(!al_init_audio_addon())
       {
           printf("ERROR INITIALIZING AUDIO ADDON!");
           return 0;
       }
       if(!al_init_acodec_addon())
       {
           printf("ERROR INITIALIZING AUDIO CODECS!");
           return 0;
       }*/
       //al_set_physfs_file_interface();
       return 1;
    }
    
    
    int main()
    {
        ALLEGRO_EVENT_QUEUE* event_queue = NULL;
        if(!install_allegro()) return 1;
        init(event_queue,800,600);
        ALLEGRO_FONT* font_times = al_load_font("times.ttf",20,0);
        if(font_times==NULL)
        {
            printf("ERROR LOADING FONT!\n");
            return 1;
        }
    
    
        al_clear_to_color(al_map_rgb(0,0,0));
        al_draw_text(font_times,al_map_rgb(255,255,0),400,300,ALLEGRO_ALIGN_CENTRE,"Hello World");
        al_flip_display();
    
    
        ALLEGRO_EVENT ev;
        bool quit = false;
        while(!quit)
        {
            al_wait_for_event(event_queue,&ev);
            if(ev.type==ALLEGRO_EVENT_KEY_DOWN)
            {
                if(ev.keyboard.keycode==ALLEGRO_KEY_ESCAPE) quit = true;
            }
        }
    
    
        al_destroy_display(al_get_current_display());
       al_destroy_event_queue(event_queue);
        return 0;
    }
    Makefile :
    Code:
    MKFILE    = Makefile
    
    
    GCC       = g++ -g -O3 -Wall -Wextra `pkg-config --cflags --libs allegro-5.0 allegro_font-5.0 allegro_ttf-5.0 allegro_font-5 allegro_ttf-5` -std=c++11
    
    
    CSOURCE   = main.cpp
    CHEADER   = 
    OBJECTS   = ${CSOURCE:.cpp=.o}
    EXECBIN   = blasteroids
    
    
    all : ${EXECBIN}
    
    
    ${EXECBIN} : ${OBJECTS}
    	${GCC} -o $@ ${OBJECTS}
    
    
     
    %.o : %.cpp
    
    
    	${GCC} -c $<
    
    
    
    
    clean :
    	- rm ${OBJECTS} ${EXECBIN}
    
    
    
    
    again :
    	${MAKE} clean all
    Basically, I keep getting the "ERROR LOADING FONT!" message even though everything is now compiling and initializing. Anything I should be checking for specifically???

  6. #6
    Registered User
    Join Date
    Oct 2006
    Posts
    2,545
    Quote Originally Posted by MutantJohn View Post
    Oh wow, I'm a moron. Turns out, the name of function was changed from the stupid tutorial I was using and it's really,
    Code:
    al_install_keyboard();
    Oh wow, I feel special now T_T
    this is one reason why I generally don't care for the C language. you can implicitly declare a function, simply by calling it.
    Code:
    namespace life
    {
        const bool change = true;
    }

  7. #7
    Registered User MutantJohn's Avatar
    Join Date
    Feb 2013
    Posts
    1,238
    Lol nevermind, SDL is so much easier to use and was ironically enough, already installed on my system.

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