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Add information about `-fno-crossjumping' for GCC.

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David Kastrup 2005-03-01 16:01:05 +00:00
parent 1868c863ed
commit 70d9a9cda7
2 changed files with 12 additions and 1 deletions
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4
etc/ChangeLog
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@ -1,3 +1,7 @@
2005-03-01 David Kastrup <dak@gnu.org>
* DEBUG: Add information about `-fno-crossjumping' for GCC.
2005-02-14 Lute Kamstra <lute@gnu.org>
* TODO: Remove battery.el entry (DONE).

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etc/DEBUG
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Debugging GNU Emacs
Copyright (c) 1985, 2000, 2001 Free Software Foundation, Inc.
Copyright (c) 1985, 2000, 2001, 2005 Free Software Foundation, Inc.
Permission is granted to anyone to make or distribute verbatim copies
of this document as received, in any medium, provided that the
@ -20,6 +20,13 @@ document.]
where the executable was made. That directory has a .gdbinit file
that defines various "user-defined" commands for debugging Emacs.
** When you are trying to analyze failed assertions, it will be
essential to compile Emacs either completely without optimizations or
at least (when using GCC) with the -fno-crossjumping option. Failure
to do so may make the compiler recycle the same abort call for all
assertions in a given function, rendering the stack backtrace useless
for identifying the specific failed assertion.
** It is a good idea to run Emacs under GDB (or some other suitable
debugger) *all the time*. Then, when Emacs crashes, you will be able
to debug the live process, not just a core dump. (This is especially