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From: Nick Desaulniers <ndesaulniers@google.com>
To: Masahiro Yamada <masahiroy@kernel.org>
Cc: Arnd Bergmann <arnd@kernel.org>, Arnd Bergmann <arnd@arndb.de>,
	Nathan Chancellor <nathan@kernel.org>,
	Nicolas Schier <nicolas@fjasle.eu>,
	Guenter Roeck <linux@roeck-us.net>, Lee Jones <lee@kernel.org>,
	Stephen Rothwell <sfr@canb.auug.org.au>,
	linux-kbuild@vger.kernel.org, linux-arch@vger.kernel.org,
	clang-built-linux <llvm@lists.linux.dev>
Subject: Re: [PATCH 5/9] extrawarn: enable format and stringop overflow warnings in W=1
Date: Mon, 21 Aug 2023 11:26:24 -0700	[thread overview]
Message-ID: <CAKwvOd=7HedYtAN3fTdTwxQbS7eYPxsxuX9wxxvNQ0BRFG0AbQ@mail.gmail.com> (raw)
In-Reply-To: <CAK7LNASuTOwHA0zz8MqxPdt5snMstpSY7==0o6kmU-RML3nioQ@mail.gmail.com>

On Sat, Aug 12, 2023 at 6:11 AM Masahiro Yamada <masahiroy@kernel.org> wrote:
>
> These are redundant because -Wall implies
> -Wformat-overflow and -Wformat-truncation
> according to the GCC manual.

To triple check this grouping behavior in clang, there's a utility
called `diagtool`.

$ diagtool tree

will print the hierarchy of diagnostics and color code them to explain
whether they're on/off by default or not-implemented-but-recognized.

For the above two -Wformat-* warnings, note that clang does not yet
implement those.  I've filed
https://github.com/llvm/llvm-project/issues/64871 to track that.
-- 
Thanks,
~Nick Desaulniers

  parent reply	other threads:[~2023-08-21 18:26 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-08-11 14:03 [PATCH 0/9] Kbuild: warning options cleanup and more warnings Arnd Bergmann
2023-08-11 14:03 ` [PATCH 1/9] Kbuild: only pass -fno-inline-functions-called-once for gcc Arnd Bergmann
2023-08-11 14:14   ` Nathan Chancellor
2023-08-11 14:23     ` Arnd Bergmann
2023-08-11 14:03 ` [PATCH 2/9] Kbuild: consolidate warning flags in scripts/Makefile.extrawarn Arnd Bergmann
2023-08-11 14:19   ` Nathan Chancellor
2023-08-11 14:26     ` Arnd Bergmann
2023-08-12  7:21       ` Masahiro Yamada
2023-08-20  1:36       ` Masahiro Yamada
2023-08-11 14:03 ` [PATCH 3/9] Kbuild: avoid duplicate warning options Arnd Bergmann
2023-08-12  9:21   ` Masahiro Yamada
2023-08-12  9:28     ` Arnd Bergmann
2023-08-20  1:38       ` Masahiro Yamada
2023-08-11 14:03 ` [PATCH 4/9] extrawarn: don't turn off -Wshift-negative-value for gcc-9 Arnd Bergmann
2023-08-12 12:04   ` Masahiro Yamada
2023-08-11 14:03 ` [PATCH 5/9] extrawarn: enable format and stringop overflow warnings in W=1 Arnd Bergmann
2023-08-12 13:10   ` Masahiro Yamada
2023-08-20  1:40     ` Masahiro Yamada
2023-08-21 18:26     ` Nick Desaulniers [this message]
2023-08-11 14:03 ` [PATCH 6/9] extrawarn: move -Wrestrict into W=1 warnings Arnd Bergmann
2023-08-12 13:20   ` Masahiro Yamada
2023-08-20  1:45   ` Masahiro Yamada
2023-08-11 14:03 ` [PATCH 7/9] extrawarn: do not disable -Wmain at W=1 level Arnd Bergmann
2023-08-11 14:03 ` [PATCH 8/9] extrawarn: enable more warnings in W=2 Arnd Bergmann
2023-08-11 14:03 ` [PATCH 9/9] [RFC] extrawarn: enable more W=1 warnings by default Arnd Bergmann
2023-08-11 16:09   ` Nathan Chancellor
2023-08-11 18:23     ` Arnd Bergmann
2023-08-14 19:52       ` Nathan Chancellor

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