linux-kernel - Re: [PATCH] Makefile.kcov: apply needed compiler option unconditionally in CFLAGS

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Message-ID: <20250508164425.GD834338@ax162>
Date: Thu, 8 May 2025 17:44:25 +0100
From: Nathan Chancellor <nathan@...nel.org>
To: Lukas Bulwahn <lbulwahn@...hat.com>
Cc: Masahiro Yamada <masahiroy@...nel.org>,
	Nicolas Schier <nicolas.schier@...ux.dev>,
	Dmitry Vyukov <dvyukov@...gle.com>,
	Andrey Konovalov <andreyknvl@...il.com>,
	Arnd Bergmann <arnd@...db.de>, linux-kbuild@...r.kernel.org,
	kasan-dev@...glegroups.com, kernel-janitors@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Lukas Bulwahn <lukas.bulwahn@...hat.com>
Subject: Re: [PATCH] Makefile.kcov: apply needed compiler option
 unconditionally in CFLAGS_KCOV

On Wed, May 07, 2025 at 03:30:43PM +0200, Lukas Bulwahn wrote:
> From: Lukas Bulwahn <lukas.bulwahn@...hat.com>
> 
> Commit 852faf805539 ("gcc-plugins: remove SANCOV gcc plugin") removes the
> config CC_HAS_SANCOV_TRACE_PC, as all supported compilers include the
> compiler option '-fsanitize-coverage=trace-pc' by now.
> 
> The commit however misses the important use of this config option in
> Makefile.kcov to add '-fsanitize-coverage=trace-pc' to CFLAGS_KCOV.
> Include the compiler option '-fsanitize-coverage=trace-pc' unconditionally
> to CFLAGS_KCOV, as all compilers provide that option now.
> 
> Fixes: 852faf805539 ("gcc-plugins: remove SANCOV gcc plugin")
> Signed-off-by: Lukas Bulwahn <lukas.bulwahn@...hat.com>

Good catch.

Reviewed-by: Nathan Chancellor <nathan@...nel.org>

> ---
>  scripts/Makefile.kcov | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/scripts/Makefile.kcov b/scripts/Makefile.kcov
> index 67de7942b3e7..01616472f43e 100644
> --- a/scripts/Makefile.kcov
> +++ b/scripts/Makefile.kcov
> @@ -1,5 +1,5 @@
>  # SPDX-License-Identifier: GPL-2.0-only
> -kcov-flags-$(CONFIG_CC_HAS_SANCOV_TRACE_PC)	+= -fsanitize-coverage=trace-pc
> +kcov-flags-y					+= -fsanitize-coverage=trace-pc
>  kcov-flags-$(CONFIG_KCOV_ENABLE_COMPARISONS)	+= -fsanitize-coverage=trace-cmp
>  
>  export CFLAGS_KCOV := $(kcov-flags-y)
> -- 
> 2.49.0
>