Commit 034ea24d authored by Eli Zaretskii's avatar Eli Zaretskii

nt/INSTALL: Elaborate on debugging fatal errors.

parent 8c535114
2011-11-25 Eli Zaretskii <>
* INSTALL: Elaborate on debugging fatal errors.
2011-11-15 Eli Zaretskii <>
* README.W32: Update the GTK Windows download URL for libpng.
......@@ -599,6 +599,30 @@
the debugger, and you will be able to debug the cause of the fatal
The single most important thing to find out when Emacs aborts or
crashes is where did that happen in the Emacs code. This is called
Emacs on Windows uses more than one thread. When Emacs aborts due
to a fatal error, the current thread may not be the application
thread running Emacs code. Therefore, to produce a meaningful
backtrace from a debugger, you need to iunstruct it to show the
backtrace for every thread. With GDB, you do it like this:
(gdb) thread apply all backtrace
To run Emacs under a debugger to begin with, simply start it from
the debugger. With GDB, chdir to the `src' directory (if you have
the source tree) or to a directory with the `.gdbinit' file (if you
don't have the source tree), and type these commands:
C:\whatever\src> gdb x:\path\to\emacs.exe
Thereafter, use Emacs as usual; you can minimize the debugger
window, if you like. The debugger will take control if and when
Emacs crashes.
Emacs functions implemented in C use a naming convention that reflects
their names in lisp. The names of the C routines are the lisp names
prefixed with 'F', and with dashes converted to underscores. For
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