From: Nathan Chancellor <nathan@kernel.org>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: Nicolas Schier <nsc@kernel.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
Huacai Chen <chenhuacai@kernel.org>,
WANG Xuerui <kernel@xen0n.name>,
"James E.J. Bottomley" <James.Bottomley@hansenpartnership.com>,
Helge Deller <deller@gmx.de>,
Madhavan Srinivasan <maddy@linux.ibm.com>,
Michael Ellerman <mpe@ellerman.id.au>,
Nicholas Piggin <npiggin@gmail.com>,
"Christophe Leroy (CS GROUP)" <chleroy@kernel.org>,
Heiko Carstens <hca@linux.ibm.com>,
Vasily Gorbik <gor@linux.ibm.com>,
Alexander Gordeev <agordeev@linux.ibm.com>,
Christian Borntraeger <borntraeger@linux.ibm.com>,
Sven Schnelle <svens@linux.ibm.com>,
Thomas Gleixner <tglx@kernel.org>, Ingo Molnar <mingo@redhat.com>,
Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
x86@kernel.org, Ard Biesheuvel <ardb@kernel.org>,
Ilias Apalodimas <ilias.apalodimas@linaro.org>,
Nick Desaulniers <nick.desaulniers+lkml@gmail.com>,
Bill Wendling <morbo@google.com>,
Justin Stitt <justinstitt@google.com>,
Kees Cook <kees@kernel.org>,
linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, loongarch@lists.linux.dev,
linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
linux-s390@vger.kernel.org, linux-efi@vger.kernel.org,
llvm@lists.linux.dev
Subject: Re: [PATCH 0/2] kbuild: Switch from '-fms-extensions' to '-fms-anonymous-structs' when available
Date: Fri, 6 Mar 2026 16:17:05 -0700 [thread overview]
Message-ID: <20260306231705.GD2746259@ax162> (raw)
In-Reply-To: <01433066-eb9b-4a96-8d7f-794af941d365@zytor.com>
On Thu, Mar 05, 2026 at 03:43:29PM -0800, H. Peter Anvin wrote:
> Question: does clang allow this with __extension__, or only if the option is
> on the command line? It would be desirable in the long run if both clang and
It looks like only on the command line:
https://godbolt.org/z/zrE766obe
> gcc would allow this with __extension__, as that would be required to use it
> in uapi headers (at least without some doable-but-nontrivial preprocessing,
> which might be worthwhile to do anyway...)
I agree that would be desirable but wouldn't that change how
__extension__ works? As far as I can tell from reading GCC's
documentation [1], __extension__ just supresses warnings from -pedantic
and such, it does not actually enable a used extension if it conflicts
with whatever -std= value is passed?
[1]: https://gcc.gnu.org/onlinedocs/gcc/Alternate-Keywords.html
Cheers,
Nathan
next prev parent reply other threads:[~2026-03-06 23:17 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-23 19:10 [PATCH 0/2] kbuild: Switch from '-fms-extensions' to '-fms-anonymous-structs' when available Nathan Chancellor
2026-02-23 19:10 ` [PATCH 1/2] kbuild: Consolidate C dialect options Nathan Chancellor
2026-02-27 16:36 ` Nicolas Schier
2026-02-23 19:10 ` [PATCH 2/2] kbuild: Use '-fms-anonymous-structs' if it is available Nathan Chancellor
2026-02-23 22:33 ` Kees Cook
2026-02-23 22:53 ` Nathan Chancellor
2026-02-23 23:02 ` Kees Cook
2026-02-24 20:55 ` Nathan Chancellor
2026-03-05 10:25 ` Nicolas Schier
2026-02-23 19:38 ` [PATCH 0/2] kbuild: Switch from '-fms-extensions' to '-fms-anonymous-structs' when available Ard Biesheuvel
2026-02-23 21:13 ` Helge Deller
2026-03-05 23:43 ` H. Peter Anvin
2026-03-06 23:17 ` Nathan Chancellor [this message]
2026-03-06 23:31 ` H. Peter Anvin
2026-03-09 6:49 ` Nicolas Schier
2026-03-12 12:08 ` Nicolas Schier
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