Re: [PATCH][next] Makefile: Enable -Wstringop-overflow globally

Masahiro Yamada
2023-11-16T11:24:18Z

On Thu, Nov 16, 2023 at 12:27 PM Gustavo A. R. Silva
<gustavoars@kernel.org> wrote:
>
> It seems that we have finished addressing all the remaining
> issues regarding compiler option -Wstringop-overflow. So, we
> are now in good shape to enable this compiler option globally.
>
> Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
> ---
> Makefile | 3 +++
> scripts/Makefile.extrawarn | 2 --
> 2 files changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/Makefile b/Makefile
> index 690cde550acd..452b7d0e19e9 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -985,6 +985,9 @@ NOSTDINC_FLAGS += -nostdinc
> # perform bounds checking.
> KBUILD_CFLAGS += $(call cc-option, -fstrict-flex-arrays=3)
>
> +# We are now in good shape to enable this option.

Please remove this comment.

It it fine to mention it in the commit log, but
not in the Makefile.

I hope somebody will double-check this patch in CI infrastructure.

> +KBUILD_CFLAGS += $(call cc-option, -Wstringop-overflow)
> +
> # disable invalid "can't wrap" optimizations for signed / pointers
> KBUILD_CFLAGS += -fno-strict-overflow
>
> diff --git a/scripts/Makefile.extrawarn b/scripts/Makefile.extrawarn
> index 2fe6f2828d37..1527199161d7 100644
> --- a/scripts/Makefile.extrawarn
> +++ b/scripts/Makefile.extrawarn
> @@ -106,7 +106,6 @@ KBUILD_CFLAGS += $(call cc-option, -Wunused-const-variable)
> KBUILD_CFLAGS += $(call cc-option, -Wpacked-not-aligned)
> KBUILD_CFLAGS += $(call cc-option, -Wformat-overflow)
> KBUILD_CFLAGS += $(call cc-option, -Wformat-truncation)
> -KBUILD_CFLAGS += $(call cc-option, -Wstringop-overflow)
> KBUILD_CFLAGS += $(call cc-option, -Wstringop-truncation)
>
> KBUILD_CPPFLAGS += -Wundef
> @@ -122,7 +121,6 @@ KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
> KBUILD_CFLAGS += $(call cc-disable-warning, packed-not-aligned)
> KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
> KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
> -KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
> KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
>
> ifdef CONFIG_CC_IS_CLANG
> --
> 2.34.1
>

--
Best Regards
Masahiro Yamada