From: Nathan Chancellor <nathan@kernel.org>
To: Segher Boessenkool <segher@kernel.crashing.org>
Cc: 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 <christophe.leroy@csgroup.eu>,
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@linutronix.de>,
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>,
Nick Desaulniers <nick.desaulniers+lkml@gmail.com>,
Bill Wendling <morbo@google.com>,
Justin Stitt <justinstitt@google.com>,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.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, Christian Brauner <brauner@kernel.org>,
Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: [PATCH] kbuild: Add '-fms-extensions' to areas with dedicated CFLAGS
Date: Wed, 5 Nov 2025 13:15:22 -0700 [thread overview]
Message-ID: <20251105201522.GB3787308@ax162> (raw)
In-Reply-To: <aQtUujos2ADVs-_O@gate>
On Wed, Nov 05, 2025 at 07:44:26AM -0600, Segher Boessenkool wrote:
> On Sat, Nov 01, 2025 at 12:35:47PM -0400, Nathan Chancellor wrote:
> > There are many places within the kernel that use their own CFLAGS
> > instead of the main KBUILD_CFLAGS, meaning code written with the main
> > kernel's use of '-fms-extensions' in mind that may be tangentially
> > included in these areas will result in "error: declaration does not
> > declare anything" messages from the compiler.
>
> Please fix such non-standard code then, instead? The only (documented)
> thing -fms-extensions does for C code is give meaning to something that
> otherwise is a syntax error (and it is for a good reason!)
Right, the kernel would like to start taking advantage of one of those
extensions. See these other threads for more information.
https://lore.kernel.org/20251020142228.1819871-1-linux@rasmusvillemoes.dk/
https://lore.kernel.org/20251023082142.2104456-1-linux@rasmusvillemoes.dk/
Cheers,
Nathan
prev parent reply other threads:[~2025-11-05 20:15 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-11-01 16:35 [PATCH] kbuild: Add '-fms-extensions' to areas with dedicated CFLAGS Nathan Chancellor
2025-11-01 16:55 ` Ard Biesheuvel
2025-11-05 12:56 ` Christian Brauner
2025-11-05 19:39 ` Nathan Chancellor
2025-11-06 17:47 ` Nathan Chancellor
2025-11-05 13:44 ` Segher Boessenkool
2025-11-05 20:15 ` Nathan Chancellor [this message]
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