Allegro 5.0 library woes T_T

Printable View

08-28-2013
MutantJohn

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.
08-28-2013
ledow

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.
08-28-2013
MutantJohn
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
08-28-2013
MutantJohn

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
08-28-2013
MutantJohn

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 • 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???
08-28-2013
Elkvis

Quote:

Originally Posted by MutantJohn

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.
08-28-2013
MutantJohn

Lol nevermind, SDL is so much easier to use and was ironically enough, already installed on my system.