From: Paul Eggert <eggert@cs.ucla.edu>
To: Jonathan Wakely <jwakely.gcc@gmail.com>
Cc: Aaron Ballman <aaron@aaronballman.com>,
Zack Weinberg <zack@owlfolio.org>,
c-std-porting@lists.linux.dev, autoconf@gnu.org, gcc@gcc.gnu.org,
cfe-commits@lists.llvm.org, Gnulib bugs <bug-gnulib@gnu.org>
Subject: Re: How can Autoconf help with the transition to stricter compilation defaults?
Date: Tue, 15 Nov 2022 11:08:03 -0800 [thread overview]
Message-ID: <9cb106e9-16ff-65ec-6a44-6567c77521dc@cs.ucla.edu> (raw)
In-Reply-To: <CAH6eHdS-N51Yi4wwQ1U4tM==JyJ3-OZX4ZuawJd+_UMsuZUXSg@mail.gmail.com>
On 2022-11-15 06:50, Jonathan Wakely wrote:
> Could you clarify what you mean, with a concrete example? Surely as
> long as errors are reported on stderr and the compiler exits with
> non-zero status, that's an acceptable way to report errors?
Not if the "error" is harmless as far as Autoconf is concerned, which is
what led to this thread. The concrete example here is that Autoconf
needs to check whether a function can be linked to (as opposed to
checking the function's signature). Clang shouldn't get in the way.
In lots of places the C standard says behavior is undefined, even though
the behavior is fine on the current platform for the intended use. It's
not just the example we're talking about; adding zero to a null pointer
is another such example.
In such cases it's OK for Clang to warn, but having Clang exit with
nonzero status is overkill and counterproductive.
next prev parent reply other threads:[~2022-11-15 19:08 UTC|newest]
Thread overview: 65+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-10 17:16 Zack Weinberg
2022-11-10 17:52 ` Nick Bowler
2022-11-10 17:58 ` Jonathan Wakely
2022-11-10 18:12 ` Jonathan Wakely
2022-11-10 18:44 ` Aaron Ballman
2022-11-12 2:56 ` Zack Weinberg
2022-11-10 18:05 ` Rich Felker
2022-11-10 21:44 ` Florian Weimer
2022-11-12 3:22 ` Zack Weinberg
2022-11-10 18:08 ` Florian Weimer
2022-11-12 3:40 ` Zack Weinberg
2022-11-12 3:43 ` Sam James
2022-11-12 14:27 ` Zack Weinberg
2022-11-12 3:45 ` Joseph Myers
2022-11-12 15:59 ` Wookey
2022-11-12 16:12 ` Zack Weinberg
2022-11-10 18:19 ` Aaron Ballman
2022-11-10 21:05 ` Paul Eggert
2022-11-11 15:11 ` Aaron Ballman
2022-11-13 0:43 ` Paul Eggert
2022-11-14 12:41 ` Aaron Ballman
2022-11-14 18:14 ` Paul Eggert
2022-11-14 18:30 ` Florian Weimer
2022-11-14 18:35 ` Aaron Ballman
2022-11-15 14:50 ` Jonathan Wakely
2022-11-15 19:08 ` Paul Eggert [this message]
2022-11-15 19:27 ` Jonathan Wakely
2022-11-15 20:27 ` Paul Eggert
2022-11-15 20:57 ` Aaron Ballman
2022-11-15 23:09 ` Paul Eggert
2022-11-15 23:43 ` Ben Boeckel
2022-11-16 14:26 ` Michael Matz
2022-11-16 14:40 ` Alexander Monakov
2022-11-16 15:01 ` Michael Matz
2022-11-16 15:27 ` Richard Biener
2022-11-16 15:35 ` Sam James
2022-11-16 15:59 ` Michael Matz
2022-11-16 16:20 ` Jonathan Wakely
2022-11-16 16:34 ` Michael Matz
2022-11-16 16:46 ` Jonathan Wakely
2022-11-16 18:17 ` Paul Eggert
2022-11-16 18:40 ` Jeffrey Walton
2022-11-17 18:45 ` Paul Eggert
2022-11-16 18:59 ` Zack Weinberg
2022-11-17 18:58 ` Paul Eggert
2022-11-17 21:35 ` Bruno Haible
2022-11-17 22:27 ` Paul Eggert
2022-11-17 13:30 ` Michael Matz
2022-11-15 20:36 ` Aaron Ballman
2022-11-15 5:03 ` Sam James
2022-11-15 13:30 ` Zack Weinberg
2022-11-15 13:34 ` Sam James
2022-11-16 0:08 ` Bob Friesenhahn
2022-11-13 0:43 ` Paul Eggert
2022-11-17 13:57 ` Jason Merrill
2022-11-10 20:19 ` Paul Eggert
[not found] ` <d785b19371e8419f5a5817d7cdb429db91614a3a.camel@orlitzky.com>
2022-11-11 3:08 ` Sam James
2022-11-11 3:33 ` Zack Weinberg
2022-11-11 8:40 ` Sam James
2022-11-11 9:02 ` Paul Eggert
2022-11-12 14:09 ` Zack Weinberg
2022-11-11 23:25 ` Sam James
2022-11-12 0:53 ` Paul Eggert
2022-11-12 4:00 ` Sam James
2022-11-11 9:15 ` Sam James
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