How can I add debugging symbols to Audacious?

Question

I am writing a plugin for audacious, and I am experiencing random segfaults. I looked around and I found that I can process the program's core dumps with gdb.

So I did that, and I got this output:

http://pastebin.com/m7d0d663d

As you can see, it says no debugging symbols where found anywhere. I want to compile audacious with debugging symbols, but I am not sure how. I tried editing configure, which only includes a file named buildsys.mk, so I edited that and removed the -s flag from the linker, and made sure that the -g flag is passed to the compiler. The gdb output above is after I did that, so apparently what I did had no effect.

So how can I retain debugging symbols when compiling audacious? The problem is that I am only writing a small plugin, and haven't got a grasp of the while audacious code.

UPDATE: I added debugging symbols for gtk+ and glib (and also tried the CFLAGS=-g option), and I got a couple of coredumps analyzed. The bottom line is this:

(gdb) bt
#0  gtk_text_iter_make_real (_iter=<value optimized out>) at /build/buildd/gtk+2.0-2.16.1/gtk/gtktextiter.c:202
#1  0xb7c1cf5e in _gtk_text_iter_get_any_segment (iter=0x0) at /build/buildd/gtk+2.0-2.16.1/gtk/gtktextiter.c:474
#2  0xb7c24cd6 in IA__gtk_text_layout_get_line_display (layout=0x93a4318, line=0x9af6270, size_only=1) at /build/buildd/gtk+2.0-2.16.1/gtk/gtktextlayout.c:2196
#3  0xb7c29172 in gtk_text_layout_real_wrap (layout=0x93a4318, line=0x9af6270, line_data=0xb10036b8) at /build/buildd/gtk+2.0-2.16.1/gtk/gtktextlayout.c:1147
#4  0xb7c2358f in IA__gtk_text_layout_wrap (layout=0x93a4318, line=0x9af6270, line_data=0x0) at /build/buildd/gtk+2.0-2.16.1/gtk/gtktextlayout.c:693
#5  0xb7c060a1 in _gtk_text_btree_validate_line (tree=0x9407370, line=0x9af6270, view_id=0x93a4318) at /build/buildd/gtk+2.0-2.16.1/gtk/gtktextbtree.c:5422
#6  0xb7c27dc1 in IA__gtk_text_layout_validate_yrange (layout=0x93a4318, anchor=0xbfb0e624, y0=0, y1=635) at /build/buildd/gtk+2.0-2.16.1/gtk/gtktextlayout.c:1062
#7  0xb7c34999 in gtk_text_view_validate_onscreen (text_view=0x9406000) at /build/buildd/gtk+2.0-2.16.1/gtk/gtktextview.c:3502
#8  0xb7c35f85 in gtk_text_view_flush_first_validate (text_view=0x9406000) at /build/buildd/gtk+2.0-2.16.1/gtk/gtktextview.c:3558
#9  0xb7c35fde in first_validate_callback (data=0x9406000) at /build/buildd/gtk+2.0-2.16.1/gtk/gtktextview.c:3577
#10 0xb79c88fb in gdk_threads_dispatch (data=0x9bce910) at /build/buildd/gtk+2.0-2.16.1/gdk/gdk.c:498
#11 0xb7e38c81 in g_idle_dispatch (source=0x938a400, callback=0, user_data=0x9bce910) at /build/buildd/glib2.0-2.20.1/glib/gmain.c:3922
#12 0xb7e3ab88 in IA__g_main_context_dispatch (context=0x9250760) at /build/buildd/glib2.0-2.20.1/glib/gmain.c:1814
#13 0xb7e3e0eb in g_main_context_iterate (context=0x9250760, block=1, dispatch=1, self=0x92333e8) at /build/buildd/glib2.0-2.20.1/glib/gmain.c:2448
#14 0xb7e3e5ba in IA__g_main_loop_run (loop=0x9a92c88) at /build/buildd/glib2.0-2.20.1/glib/gmain.c:2656
#15 0xb7b707d9 in IA__gtk_main () at /build/buildd/gtk+2.0-2.16.1/gtk/gtkmain.c:1205
#16 0xb268d56a in skins_init () from /usr/local/lib/audacious/General/skins.so
#17 0x0805b42a in ?? ()
#18 0xb7540775 in __libc_start_main () from /lib/tls/i686/cmov/libc.so.6
#19 0x08055361 in ?? ()
(gdb)

And the exact error is:

#0  gtk_text_iter_make_real (_iter=<value optimized out>) at /build/buildd/gtk+2.0-2.16.1/gtk/gtktextiter.c:202
202 /build/buildd/gtk+2.0-2.16.1/gtk/gtktextiter.c: No such file or directory.
in /build/buildd/gtk+2.0-2.16.1/gtk/gtktextiter.c

The exact line is this:

if (iter->segments_changed_stamp !=

Can anyone make anything out of this? :-\

Answer 1

As far as I know, audacious uses autotools. No need to modify anything, just configure with:

CFLAGS="-g $CFLAGS" ./configure

followed by the usual steps to install it. The flags are stored (in config.status I think), so any subsequent call to make will build a debug-enabled audacious.

Answer 2

While it's true that doing either:

./configure CFLAGS=-g && make && make install

or

make CFLAGS=-g

will get you a build with debug symbols, this is quite unlikely to help you solve the problem.

You program crashed in /usr/lib/libgtk-x11-2.0.so.0, not in audacious2 (whatever that is). You are also analyzing the core incorrectly: list doesn't make sense at that stage. Your very first (gdb) command when analyzing a core should almost always be where, followed by thread apply all where.

You might also get better results from installing libgtk2-debuginfo or some such package, which should provide debug info for libgtk-x11-2.0.so.0, and may allow you to see the source and variables in libgtk at crash point.