From: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
To: Paul B Mahol <onemda@gmail.com>,
FFmpeg development discussions and patches
<ffmpeg-devel@ffmpeg.org>
Subject: Re: [FFmpeg-devel] [PATCH 3/4] avfilter/vf_ccrepack: Constify filter
Date: Thu, 29 Jun 2023 21:36:31 +0200
Message-ID: <AS8P250MB0744EC8B099DDC58EABE658D8F25A@AS8P250MB0744.EURP250.PROD.OUTLOOK.COM> (raw)
In-Reply-To: <CAPYw7P6hDiDGX90o1=D6u7m_bssCmFYtvzUzCUXUuw+ScD6eqA@mail.gmail.com>
Paul B Mahol:
> On Thu, Jun 29, 2023 at 8:18 PM Andreas Rheinhardt <
> andreas.rheinhardt@outlook.com> wrote:
>
>> The discrepancy between the definition and the declaration
>> in allfilters.c is actually UB.
>>
>
> I get no such message with ubsan.
>
UBSan is a runtime UB-detector, not a compile-time UB detector.
The earlier code is UB because of 6.2.7 (2) of C11: "All declarations
that refer to the same object or function shall have compatible type;
otherwise, the behavior is undefined." A type and its const-qualified
type are not compatible.
- Andreas
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next prev parent reply other threads:[~2023-06-29 19:35 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-29 18:17 [FFmpeg-devel] [PATCH 1/4] avcodec/cbs_h266: Remove double ; Andreas Rheinhardt
2023-06-29 18:18 ` James Almer
2023-06-29 18:20 ` Andreas Rheinhardt
2023-06-29 18:19 ` [FFmpeg-devel] [PATCH 2/4] avcodec/vvc_parser: Constify parser Andreas Rheinhardt
2023-06-29 18:19 ` James Almer
2023-06-29 18:19 ` [FFmpeg-devel] [PATCH 3/4] avfilter/vf_ccrepack: Constify filter Andreas Rheinhardt
2023-06-29 18:19 ` James Almer
2023-06-29 19:18 ` Paul B Mahol
2023-06-29 19:36 ` Andreas Rheinhardt [this message]
2023-06-29 19:42 ` Paul B Mahol
2023-06-29 19:51 ` James Almer
2023-06-29 19:57 ` Andreas Rheinhardt
2023-07-01 12:01 ` Rémi Denis-Courmont
2023-06-29 18:19 ` [FFmpeg-devel] [PATCH 4/4] avformat/ac4dec: Constify demuxer Andreas Rheinhardt
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