GNU bug report logs - #76393
Warn about -fsanitizer=address builds

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Pip Cet <pipcet <at> protonmail.com>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#76393: closed (Warn about -fsanitizer=address builds)
Date: Sat, 01 Mar 2025 21:43:01 +0000

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Your message dated Sat, 01 Mar 2025 21:42:27 +0000
with message-id <87y0xo2ztl.fsf <at> protonmail.com>
and subject line Re: bug#76393: Warn about -fsanitizer=address builds
has caused the debbugs.gnu.org bug report #76393,
regarding Warn about -fsanitizer=address builds
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


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76393: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=76393
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From: Pip Cet <pipcet <at> protonmail.com>
To: bug-gnu-emacs <at> gnu.org, Paul Eggert <eggert <at> cs.ucla.edu>
Subject: Warn about -fsanitizer=address builds
Date: Tue, 18 Feb 2025 12:34:08 +0000

Building with current GCC and -fsanitizer=address results in certain
(large) stack allocations being performed on a "fake stack", using
__asan_stack_malloc_N.  This "fake stack" is invisible to GC and thus
breaks conservative GC scanning (bug#76327).

It seems to be possible to work around this by setting

ASAN_OPTIONS=detect_stack_use_after_return=0

Even with that option, a "sanitized" build reports bogus errors.

ASAN_OPTIONS=detect_stack_use_after_return=0,detect_leaks=0

seems to work, at least, but is it really worth it to keep adding
options (inconveniently using environment variables) to work around such
ASAN bugs?

I think it would be preferrable to warn about builds with
-fsanitizer=address, which generates broken code, or disable them
entirely.

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From: Pip Cet <pipcet <at> protonmail.com>
To: Paul Eggert <eggert <at> cs.ucla.edu>
Cc: Eli Zaretskii <eliz <at> gnu.org>, 76393-done <at> debbugs.gnu.org
Subject: Re: bug#76393: Warn about -fsanitizer=address builds
Date: Sat, 01 Mar 2025 21:42:27 +0000

"Paul Eggert" <eggert <at> cs.ucla.edu> writes:

> On 2025-03-01 05:57, Pip Cet wrote:
>> Is this sufficiently diplomatic?
>
> Thanks, looks good.

Thanks! Pushed, and closing.

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