Give more-useful info on a fatal error (Bug#12328).

* doc/emacs/trouble.texi (Crashing): New section, documenting this.
* etc/NEWS: Document the change.
* src/alloc.c [ENABLE_CHECKING]: Do not include <execinfo.h>.
(die) [ENABLE_CHECKING]: Call fatal_error_backtrace instead
of doing the work ourselves.
* src/emacs.c (fatal_error_signal): Let fatal_error_backtrace
do most of the work.
(fatal_error_backtrace): New function, taken from the guts
of the old fatal_error_signal, but with a new option to output
a backtrace.
(shut_down_emacs) [!DOS_NT]: Use strsignal to give more-useful
info about the signal than just its number.
* src/lisp.h (fatal_error_backtrace, emacs_backtrace): New decls.
* src/sysdep.c: Include <execinfo.h>
(emacs_backtrace): New function, taken partly from the previous
code of the 'die' function.
(emacs_abort): Call fatal_error_backtrace rather than abort.

1 files changed, 19 insertions, 0 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index b2634c4fdc4..ea3b3a92e01 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,22 @@
+2012-09-04  Paul Eggert  <eggert@cs.ucla.edu>
+
+        Give more-useful info on a fatal error (Bug#12328).
+        * alloc.c [ENABLE_CHECKING]: Do not include <execinfo.h>.
+        (die) [ENABLE_CHECKING]: Call fatal_error_backtrace instead
+        of doing the work ourselves.
+        * emacs.c (fatal_error_signal): Let fatal_error_backtrace
+        do most of the work.
+        (fatal_error_backtrace): New function, taken from the guts
+        of the old fatal_error_signal, but with a new option to output
+        a backtrace.
+        (shut_down_emacs) [!DOS_NT]: Use strsignal to give more-useful
+        info about the signal than just its number.
+        * lisp.h (fatal_error_backtrace, emacs_backtrace): New decls.
+        * sysdep.c: Include <execinfo.h>
+        (emacs_backtrace): New function, taken partly from the previous
+        code of the 'die' function.
+        (emacs_abort): Call fatal_error_backtrace rather than abort.
+
 2012-09-04  Stefan Monnier  <monnier@iro.umontreal.ca>
 
         * lread.c (readevalloop): Call internal-macroexpand-for-load to perform