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* DEBUG: Document -fno-omit-frame-pointer.

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Paul Eggert 2013-06-13 10:52:21 -07:00
parent 9df2f513ea
commit 3865c463f5
2 changed files with 6 additions and 6 deletions
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etc/ChangeLog
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@ -1,6 +1,6 @@
2013-06-13 Paul Eggert <eggert@cs.ucla.edu>
* DEBUG: Document -Og.
* DEBUG: Document -Og and -fno-omit-frame-pointer.
2013-06-05 Teodor Zlatanov <tzz@lifelogs.com>

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etc/DEBUG
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@ -27,11 +27,11 @@ described in the node "Auto-loading safe path" in the GDB user manual.
is essential to compile Emacs with flags suitable for debugging.
With GCC 4.8 or later, you can invoke 'make' with CFLAGS="-Og -g3".
With older GCC or non-GCC commpilers, you can use CFLAGS="-O0 -g3".
With GCC and higher optimization levels such as -O2, at least compile
with the -fno-crossjumping option in CFLAGS. 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.
With GCC and higher optimization levels such as -O2, the
-fno-omit-frame-pointer and -fno-crossjumping options are often
essential. The latter prevents GCC from using 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