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This thread is locked; no one can reply to it.
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| Looking for addons in wrong directory |
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eversojk
Member #15,510
February 2014
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I am currently following a tutorial for Allegro 5 and when trying to use al_draw_text, I get a seg fault. After using gdb, I found that it is looking in my downloads directory for the text addon. Any idea why this would be? I am on Linux Mint 16, using g++ 4.8.1 and Allegro 5.0.11. GDB output: GDB backtrace: #0 al_draw_ustr (font=font@entry=0x0, color=..., x=x@entry=50, y=50, flags=flags@entry=0, ustr=0x7fffffffdf80) at /home/me/Downloads/allegro/addons/font/text.c:93 #1 0x00007ffff76f5183 in al_draw_text (font=0x0, color=..., x=50, y=<optimized out>, flags=0, text=<optimized out>) at /home/me/Downloads/allegro/addons/font/text.c:106 #2 0x0000000000400c41 in main () at main.cpp:29 My tutorial file: 1#include <allegro5/allegro.h>
2#include <allegro5/allegro_font.h>
3#include <allegro5/allegro_ttf.h>
4#include <allegro5/allegro_native_dialog.h>
5
6int main(void) {
7 ALLEGRO_DISPLAY *display = NULL;
8
9 if (!al_init()) {
10 al_show_native_message_box(NULL, NULL, NULL,
11 "failed to initialize allegro!", NULL, ALLEGRO_MESSAGEBOX_ERROR);
12 return -1;
13 }
14
15 display = al_create_display(640, 480);
16
17 if (!display) {
18 al_show_native_message_box(NULL, NULL, NULL,
19 "failed to initialize display!", NULL, ALLEGRO_MESSAGEBOX_ERROR);
20 return -1;
21 }
22
23 al_init_font_addon();
24 al_init_ttf_addon();
25
26 ALLEGRO_FONT *font24 = al_load_font("/usr/share/fonts/truetype/ubuntu-font-family/Ubuntu-Mono-R.ttf", 24, 0);
27
28 al_clear_to_color(al_map_rgb(0, 0, 0));
29 al_draw_text(font24, al_map_rgb(255, 0, 255), 50, 50, 0, "You like my font?");
30 al_flip_display();
31 al_rest(3.0);
32 al_destroy_display(display);
33
34 return 0;
35}
Makefile: 1CXX=g++
2CFLAGS=
3LDFLAGS=-L/usr/lib -lallegro -lallegro_dialog -lallegro_font -lallegro_ttf
4INCLUDE=-I. -I/usr/include/allegro5
5
6OBJS=main.cpp
7OUT=main
8
9all: main
10
11main: $(OBJS); $(CXX) $(OBJS) -o $(OUT) $(INCLUDE) $(CFLAGS) $(LDFLAGS)
12
13debug: $(OBJS); $(CXX) -O0 -g $(OBJS) -o $(OUT) $(INCLUDE) $(CFLAGS) $(LDFLAGS)
14
15clean: ; rm -rf *.o main
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pkrcel
Member #14,001
February 2012
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Check if the font is actually loaded by verifing the retunr code of al_load_font From what you posted it seems that GDB is looking for the source file in your downloads directory (which makes sense after all, I guess), but the SegFault seems due to invalid font pointer...which in turn may be caused by a failed load operation. Someone will point out that you should always check return values... It is unlikely that Google shares your distaste for capitalism. - Derezo |
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eversojk
Member #15,510
February 2014
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Thanks! I thought I had checked it but obviously I didn't, works fine now! |
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Thomas Fjellstrom
Member #476
June 2000
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That no such file or directory message is just gdb looking for the source so it can show the source at the line it crashed at. It's not a fatal error or related to the crash at all. -- |
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Edgar Reynaldo
Major Reynaldo
May 2007
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It is looking for the source code in the place it was compiled, which may have been on a different machine. My Website! | EAGLE GUI Library Demos | My Deviant Art Gallery | Spiraloid Preview | A4 FontMaker | Skyline! (Missile Defense) Eagle and Allegro 5 binaries | Older Allegro 4 and 5 binaries | Allegro 5 compile guide |
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