It has been a while (about a year) since I did backtracing in gdb. I followed my notes from then to look at a backtrace for an emacs crash, but it's not working.
km²~/downloads/:git/emacs/src> gdb ./emacs
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Reading symbols from /home/kmodi/downloads/git/emacs/src/emacs...done.
SIGINT is used by the debugger.
Are you sure you want to change it? (y or n) [answered Y; input not from terminal]
DISPLAY = :1.0
TERM = tmux-24bits
Breakpoint 1 at 0x55c782: file emacs.c, line 364.
Temporary breakpoint 2 at 0x580423: file sysdep.c, line 1022.
(gdb) break Fsignal
Breakpoint 3 at 0x605535: file eval.c, line 1508.
(gdb) r -Q
Starting program: /home/kmodi/downloads/git/emacs/src/emacs -Q
(emacs:19646): GLib-GIO-CRITICAL **: g_settings_schema_source_lookup: assertion 'source != NULL' failed
During startup program terminated with signal SIGSEGV, Segmentation fault.
You can't do that without a process to debug.
The difference in behavior I see is that the breakpoint on Fsignal is not working.
--with-modules --prefix=/home/kmodi/usr_local/apps/6/emacs/master '--program-transform-name=s/^ctags$/ctags_emacs/' 'CPPFLAGS=-fgnu89-inline -I/home/kmodi/usr_local/6/include -I/usr/include/freetype2 -I/usr/include' 'CFLAGS=-ggdb3 -O0' 'CXXFLAGS=-ggdb3 -O0' 'LDFLAGS=-L/home/kmodi/usr_local/6/lib -L/home/kmodi/usr_local/6/lib64 -ggdb3'
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GCONF GSETTINGS NOTIFY ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE LIBOTF XFT ZLIB TOOLKIT_SCROLL_BARS GTK2 X11 MODULES
Has something changed about configure (some new flag that I need to add?) to enable debug in gdb?