linux-kernel - Re: [GIT PULL] MM updates for 6.14-rc1

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Message-ID: <CAFULd4YXs89moFp4GiEOacd2hQQU+kmRYXm-XqxKJQQGZ1U09w@mail.gmail.com>
Date: Sun, 26 Jan 2025 21:06:27 +0100
From: Uros Bizjak <ubizjak@...il.com>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Miguel Ojeda <ojeda@...nel.org>, Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org, 
	mm-commits@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [GIT PULL] MM updates for 6.14-rc1

On Sun, Jan 26, 2025 at 8:46 PM Uros Bizjak <ubizjak@...il.com> wrote:
>
> On Sun, Jan 26, 2025 at 7:30 PM Linus Torvalds
> <torvalds@...ux-foundation.org> wrote:
>
> > That does seem to work, but I'd admittedly be happier if we could just
> > find some way to dynamically disable/enable __typeof_unqual__ based on
> > which compiler is used, rather than make it a config option. So that
> > bindgen would not see it, but a recent enough C compiler would.
> >
> > We already use '__has_attribute()' for some of these things. There's a
> > '__has_extension()' thing that comes from clang but that gcc also
> > supports.
> >
> > But I can't find the list of extensions that that model supports, and
> > I guess typeof_unqual isn't on that list if I find it.

Sorry, I sent the previous message too fast.

Unfortunately, you are right. The following doesn't trigger #error
neither with gcc, neither with clang:

#if __has_extension (__typeof_unqual__)
# error
#endif

Uros.