GNU bug report logs - #6031
gcc 4.5 breaks optimized builds of emacs

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From: Elias Pipping <pipping.elias <at> googlemail.com>
To: Dan Nicolaescu <dann <at> gnu.org>
Cc: 6031 <at> debbugs.gnu.org
Subject: bug#6031: gcc 4.5 breaks optimized builds of emacs
Date: Sun, 25 Apr 2010 13:12:37 +0200

On Sun, Apr 25, 2010 at 5:07 AM, Dan Nicolaescu <dann <at> gnu.org> wrote:
> Elias Pipping <pipping.elias <at> googlemail.com> writes:
>
>> Hi,
>>
>> I'm on the current HEAD of the repo.or.cz mirror of emacs which is
>>
>>   http://repo.or.cz/w/emacs.git/commit/910daaa95ca0708ad7022667e214bba4b8eb3d6b
>>
>> When I compile a minimal version of emacs like this:
>>
>>   $ ./configure CFLAGS="-O1 -foptimize-sibling-calls" --without-x
>> --without-alsa --without-dbus; [..]
>>
>> with gcc 4.5 and run it via
>>
>>   $ ./src/emacs -Q -nw
>>
>> I get a segfault. Dropping the -foptimize-sibling-calls (which is
>> implied by -O2) makes it work again. So does using an older version of
>> gcc (e.g. 4.4.3) or running emacs outside a terminal.
>
> Can you please uncomment this line in emacs/src/s/intel386.h
> /* #define NO_ARG_ARRAY */
>
> recompile everything and see if you get the problem after that.

Hi!

no -- assuming you meant src/m/intel386.h and thus

--- src/m/intel386.h~   2010-04-24 15:24:25.000000000 +0200
+++ src/m/intel386.h    2010-04-25 13:07:01.555119059 +0200
@@ -42,7 +42,7 @@
 /* Define NO_ARG_ARRAY if you cannot take the address of the first of a
  * group of arguments and treat it as an array of the arguments.  */

-/* #define NO_ARG_ARRAY */
+#define NO_ARG_ARRAY

 #ifdef USG
 #define TEXT_START 0

that doesn't appear to help.


Kind regards,

Elias Pipping

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