From: Julian Braha <julianbraha@gmail.com>
To: Kees Cook <kees@kernel.org>, Nathan Chancellor <nathan@kernel.org>
Cc: "Nicolas Schier" <nsc@kernel.org>,
"Matthew Maurer" <mmaurer@google.com>,
"Miguel Ojeda" <ojeda@kernel.org>,
"Masahiro Yamada" <masahiroy@kernel.org>,
"Borislav Petkov (AMD)" <bp@alien8.de>,
"Gary Guo" <gary@garyguo.net>,
"Thomas Weißschuh" <thomas.weissschuh@linutronix.de>,
linux-kbuild@vger.kernel.org,
"Lorenzo Stoakes (ARM)" <ljs@kernel.org>,
"Jonathan Corbet" <corbet@lwn.net>,
"Shuah Khan" <skhan@linuxfoundation.org>,
"Randy Dunlap" <rdunlap@infradead.org>,
"Vegard Nossum" <vegard.nossum@oracle.com>,
"Nauman Sabir" <officialnaumansabir@gmail.com>,
"Tejun Heo" <tj@kernel.org>, "Nicolas Pitre" <nico@fluxnic.net>,
"Andy Shevchenko" <andriy.shevchenko@linux.intel.com>,
"Andrew Jones" <andrew.jones@linux.dev>,
"Graham Roff" <grahamr@qti.qualcomm.com>,
"Arnd Bergmann" <arnd@arndb.de>,
"Krzysztof Kozlowski" <krzk@kernel.org>,
linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org,
linux-hardening@vger.kernel.org
Subject: Re: [PATCH 2/3] kconfig: Replace "cc-option-bit" with "cc-option-str"
Date: Mon, 21 Sep 2026 13:09:05 +0100 [thread overview]
Message-ID: <350cc022-2769-4052-93f4-029ef93fa41c@gmail.com> (raw)
In-Reply-To: <20260919005929.4077729-2-kees@kernel.org>
On 9/19/26 01:59, Kees Cook wrote:
> $(cc-option-bit) returns the flag it was given when the compiler accepts
> it, and an empty string otherwise. It was originally only used
> internally for machine bit flags, but it is generally useful[1].
>
> Rename it to $(cc-option-str), which says what it returns rather than
> what it was first used for, and extract the probe logic from the existing
> $(cc-option) macro to reuse it. Additionally add support for an optional
> fallback, much like the Kbuild cc-option macro. This can be used as:
>
> config CC_OPT_FOO
> def_string "$(cc-option-str,-fnew-option,-fold-option)"
>
> If the fallback is omitted, it is just an empty string.
>
> Build tested ARCH=x86_64 defconfig with GCC 16.2.0.
>
> Assisted-by: LLM
> Signed-off-by: Kees Cook <kees@kernel.org>
Tested-by: Julian Braha <julianbraha@gmail.com>
Reviewed-by: Julian Braha <julianbraha@gmail.com>
next prev parent reply other threads:[~2026-09-21 12:09 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-19 0:59 [PATCH 0/3] kconfig: Introduce cc-option-str Kees Cook
2026-09-19 0:59 ` [PATCH 1/3] kconfig: Add "def_string", "def_int" and "def_hex" Kees Cook
2026-09-19 15:34 ` Julian Braha
2026-09-20 3:40 ` Kees Cook
2026-09-21 10:25 ` Julian Braha
2026-09-19 0:59 ` [PATCH 2/3] kconfig: Replace "cc-option-bit" with "cc-option-str" Kees Cook
2026-09-21 12:09 ` Julian Braha [this message]
2026-09-19 0:59 ` [PATCH 3/3] kconfig: Add "ld-option-str" Kees Cook
2026-09-21 12:27 ` Julian Braha
2026-09-19 1:25 ` [PATCH 0/3] kconfig: Introduce cc-option-str Nathan Chancellor
2026-09-19 13:31 ` Lorenzo Stoakes (ARM)
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