Using Qt Creator with Allegro

Question

I want to get Allegro 4 (MSCV 9) to work with Qt Creator. I am using Windows XP. I have added these lines to my .pro:

INCLUDEPATH += C:/Allegro/include \
LIBS += C:/Allegro/lib/allegro-4.4.2-md.lib \
        C:/Allegro/lib/allegro-4.4.2-monolith-md.lib \
        C:/Allegro/lib/allegrogl-0.4.4-md.lib \
        C:/Allegro/lib/loadpng-1.5-md.lib \

My code looks like this:

#include <iostream>
#include <allegro.h>

volatile int closedWindow = false;

void CloseButtonCallback() {closedWindow = true;}
END_OF_FUNCTION(CloseButtonCallback())

int main()
{
    allegro_init();
    set_color_depth(32);
    set_gfx_mode(GFX_AUTODETECT_WINDOWED, 400, 300, 0, 0);
    set_window_title("Testing");

    LOCK_FUNCTION(closeButtonCallback)
    set_close_button_callback(CloseButtonCallback);
    while(!closedWindow){}
    allegro_exit();
    return 0;
}
END_OF_MAIN()

And I keep getting errors like these, when I try to compile:

main.obj:-1: error: LNK2019: unresolved external symbol imp__allegro_exit referenced in function "int __cdecl _mangled_main(void)" (?_mangled_main@@YAHXZ) main.obj:-1: error: LNK2019: unresolved external symbol _imp_set_close_button_callback referenced in function "int __cdecl _mangled_main(void)" (?_mangled_main@@YAHXZ) main.obj:-1: error: LNK2019: unresolved external symbol _imp_set_window_title referenced in function "int __cdecl _mangled_main(void)" (?_mangled_main@@YAHXZ) main.obj:-1: error: LNK2019: unresolved external symbol _imp_set_gfx_mode referenced in function "int __cdecl _mangled_main(void)" (?_mangled_main@@YAHXZ) main.obj:-1: error: LNK2019: unresolved external symbol _imp_set_color_depth referenced in function "int __cdecl _mangled_main(void)" (?_mangled_main@@YAHXZ) main.obj:-1: error: LNK2019: unresolved external symbol __imp_install_allegro_version_check referenced in function "int __cdecl _mangled_main(void)" (?_mangled_main@@YAHXZ)

Jonathan Leffler · Accepted Answer · 2012-10-30 17:41:34Z

2

I'm using precompiled Allegro 4.4 for MinGW from http://www.allegro.cc/files/. I merged those three folders (bin, include, lib) inside the archive to MinGW folder which has same folders as well. Then added LIBS += liballegro-4.4.2-mt to .pro file and everything works fine.

edited Oct 30, 2012 at 17:41

Jonathan Leffler

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answered Oct 30, 2012 at 17:17

Wade81

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Comments

Viktor Latypov · Accepted Answer · 2012-06-28 22:18:47Z

1

Looks like you have to use the GCC-compiled version of Allegro for Qt.

Something like

LIBS +="path_to_allegro_for_mingw/lib/liballegro-4.4.2-md.a"

GCC uses different name mangling and different export libraries, so even while you're using the Allegro dlls, MSVC-compiled .lib wouldn't work.

answered Jun 28, 2012 at 22:18

Viktor Latypov

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