From: Paul Eggert <eggert@cs.ucla.edu>
To: Wolfgang Jenkner <wjenkner@inode.at>, Joseph Mingrone <jrm@ftfl.ca>
Cc: ashish@FreeBSD.org, 22065@debbugs.gnu.org,
Dmitry Antipov <dmantipov@yandex.ru>
Subject: bug#22065: core dumped during compilation (emacs-25 branch on FreeBSD 9)
Date: Sun, 14 Feb 2016 11:47:57 -0800 [thread overview]
Message-ID: <56C0D9ED.3030002@cs.ucla.edu> (raw)
In-Reply-To: <85si0vjkos.fsf@iznogoud.viz>
[-- Attachment #1: Type: text/plain, Size: 530 bytes --]
Wolfgang Jenkner wrote:
> So, perhaps, the FreeBSD 9 default base cc (a patched gcc 4.2.1) has
> some stack-related optimization bug, even on amd64?
Thanks for the detective work. It inspired me to search GCC bug reports, where I
found a couple that appear to be directly relevant. The corresponding bug was
fixed in 2008 but GCC 4.2.1 predates the fix. I installed the attached patch
into the emacs-25 branch, and I hope it works around the compiler bug with
stack-allocated Lisp objects on FreeBSD 9. Please give it a try.
[-- Attachment #2: emacs.diff --]
[-- Type: text/x-diff, Size: 700 bytes --]
diff --git a/src/lisp.h b/src/lisp.h
index af73c4b..8eab38b 100644
--- a/src/lisp.h
+++ b/src/lisp.h
@@ -4522,6 +4522,12 @@ extern void *record_xmalloc (size_t) ATTRIBUTE_ALLOC_SIZE ((1));
This feature is experimental and requires careful debugging.
Build with CPPFLAGS='-DUSE_STACK_LISP_OBJECTS=0' to disable it. */
+#if (!defined USE_STACK_LISP_OBJECTS \
+ && defined __GNUC__ && !defined __clang__ \
+ && !(4 < __GNUC__ + (3 < __GNUC_MINOR__ + (2 <= __GNUC_PATCHLEVEL__))))
+ /* Work around GCC bugs 36584 and 35271, which were fixed in GCC 4.3.2. */
+# define USE_STACK_LISP_OBJECTS false
+#endif
#ifndef USE_STACK_LISP_OBJECTS
# define USE_STACK_LISP_OBJECTS true
#endif
next prev parent reply other threads:[~2016-02-14 19:47 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-30 22:10 bug#22065: core dumped during compilation (emacs-25 branch on FreeBSD 9) Joseph Mingrone
2015-12-26 21:22 ` Lars Ingebrigtsen
2016-02-13 1:08 ` Paul Eggert
2016-02-14 16:12 ` Wolfgang Jenkner
2016-02-14 19:47 ` Paul Eggert [this message]
2016-02-15 4:05 ` Joseph Mingrone
2016-02-15 5:56 ` Ashish SHUKLA
2016-02-15 8:17 ` Paul Eggert
2016-02-15 13:08 ` Wolfgang Jenkner
2016-02-15 18:51 ` Joseph Mingrone
2016-02-15 18:51 ` Joseph Mingrone
2016-02-17 3:38 ` Joseph Mingrone
2016-02-17 7:56 ` Paul Eggert
2016-02-17 13:23 ` Wolfgang Jenkner
2016-02-17 15:35 ` Joseph Mingrone
2016-02-17 17:49 ` Wolfgang Jenkner
2016-02-17 22:45 ` Joseph Mingrone
2016-02-18 13:39 ` Wolfgang Jenkner
2016-03-20 2:40 ` Paul Eggert
[not found] ` <handler.22065.D22065.145844160912708.notifdone@debbugs.gnu.org>
2016-03-20 2:52 ` bug#22065: closed (Re: bug#22065: core dumped during compilation (emacs-25 branch on FreeBSD 9)) Joseph Mingrone
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