From: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
To: ffmpeg-devel@ffmpeg.org
Subject: Re: [FFmpeg-devel] [PATCH] avcodec: add farbfeld encoder
Date: Mon, 3 Jun 2024 23:56:21 +0200
Message-ID: <GV1P250MB0737F673C7E9FE98A13067488FFF2@GV1P250MB0737.EURP250.PROD.OUTLOOK.COM> (raw)
In-Reply-To: <2073001.WZ9lY2TYtf@basile.remlab.net>
Rémi Denis-Courmont:
> Le maanantaina 3. kesäkuuta 2024, 22.29.13 EEST marcus a écrit :
>>> Bogus cast / aliasing violation.
>>
>> I thought qualifiers don't affect aliasing rules in C. Am I wrong?
>
> If they didn't, the compiler wouldn't warn about incompatible pointer type
> conversions in the absence of the explict cast.
>
Wrong: The conversion uint8_t*const*->const uint8_t * const* is safe
(indeed, C++ performs it automatically); the conversion
uint8_t*const*->const uint8_t ** (which is what the cast here does) is
safe from an aliasing point of view, but not
const-correct/-Wcast-qual-correct (cast to const uint8_t * const* instead).
It is a limitation of C not to be like C++ here.
- Andreas
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next prev parent reply other threads:[~2024-06-03 21:56 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-06-03 3:27 Marcus B Spencer
2024-06-03 6:05 ` Rémi Denis-Courmont
2024-06-03 19:29 ` marcus
2024-06-03 19:38 ` Rémi Denis-Courmont
2024-06-03 21:56 ` Andreas Rheinhardt [this message]
2024-06-04 6:04 ` Rémi Denis-Courmont
2024-06-04 7:06 ` Andreas Rheinhardt
2024-06-04 7:19 ` Andreas Rheinhardt
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