From: "Manuel López-Ibáñez" <lopezibanez@gmail.com>
To: Paolo Bonzini <bonzini@gnu.org>
Cc: Gcc Patch List <gcc-patches@gcc.gnu.org>
Subject: Re: [PATCH v2] cpp/c: Add -Wexpansion-to-defined
Date: Wed, 10 Aug 2016 14:43:00 -0000 [thread overview]
Message-ID: <CAESRpQCB-RnqJV+zmGL_Nj2w6gASLui9Cw5UgYeW9n21xsiEFg@mail.gmail.com> (raw)
In-Reply-To: <59051c81-0056-3e01-54a6-07b71307965c@gnu.org>
On 10 August 2016 at 13:06, Paolo Bonzini <bonzini@gnu.org> wrote:
>
>
> On 10/08/2016 13:31, Manuel López-Ibáñez wrote:
>> My only fear is that people not using -Wpedantic nor -pedantic-errors
>> expect that GNU extensions work. This is a GNU extension that defines
>> something that is undefined according to ISO. Enabling the warning
>> with -Wextra is just annoying those people who may not care about
>> other compilers.
>
> I think this warning falls in the same category as
> -Wshift-negative-value. (In fact I dislike -Wshift-negative-value a
> lot, and would put that one under -Wpedantic only).
It is not the same category. One is compile-time UB and the other is
runtime UB. See:
https://gcc.gnu.org/ml/gcc-patches/2015-04/msg01551.html
and https://gcc.gnu.org/ml/gcc-patches/2015-04/msg01529.html
Cheers,
Manuel.
next prev parent reply other threads:[~2016-08-10 14:43 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-10 10:06 Paolo Bonzini
2016-08-10 11:32 ` Manuel López-Ibáñez
2016-08-10 11:53 ` Joseph Myers
2016-08-10 12:06 ` Paolo Bonzini
2016-08-10 14:43 ` Manuel López-Ibáñez [this message]
2016-08-10 14:45 ` Paolo Bonzini
2016-08-10 15:25 ` Manuel López-Ibáñez
2016-08-10 15:29 ` Paolo Bonzini
2016-08-10 15:33 ` Joseph Myers
2016-08-10 15:51 ` Paolo Bonzini
2016-08-10 15:58 ` Joseph Myers
2016-08-10 16:01 ` Paolo Bonzini
2016-08-11 3:02 ` Sandra Loosemore
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