linux-kernel - Re: [PATCH 4/4] selftests/nolibc: enable -Wall compiler warnings

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Message-Id: <20230731071718.21085-1-falcon@tinylab.org>
Date:   Mon, 31 Jul 2023 15:17:18 +0800
From:   Zhangjin Wu <falcon@...ylab.org>
To:     linux@...ssschuh.net
Cc:     falcon@...ylab.org, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org, shuah@...nel.org,
        tanyuan@...ylab.org, w@....eu
Subject: Re: [PATCH 4/4] selftests/nolibc: enable -Wall compiler warnings

Hi, Thomas

> It will help the developers to avoid cruft and detect some bugs.
> 
> Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
> ---
>  tools/testing/selftests/nolibc/Makefile | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/testing/selftests/nolibc/Makefile b/tools/testing/selftests/nolibc/Makefile
> index f42adef87e12..72227d75c6da 100644
> --- a/tools/testing/selftests/nolibc/Makefile
> +++ b/tools/testing/selftests/nolibc/Makefile
> @@ -79,7 +79,7 @@ endif
>  CFLAGS_s390 = -m64
>  CFLAGS_mips = -EL
>  CFLAGS_STACKPROTECTOR ?= $(call cc-option,-mstack-protector-guard=global $(call cc-option,-fstack-protector-all))
> -CFLAGS  ?= -Os -fno-ident -fno-asynchronous-unwind-tables -std=c89 \
> +CFLAGS  ?= -Os -fno-ident -fno-asynchronous-unwind-tables -std=c89 -Wall \

Very good static analyzer support.

What about further add more options?

    +CFLAGS  ?= -Os -fno-ident -fno-asynchronous-unwind-tables -std=c89 -Wall -Wextra -Werror\

A simple test shows, it can catch more issues.

Thanks,
Zhangjin

>  		$(call cc-option,-fno-stack-protector) \
>  		$(CFLAGS_$(ARCH)) $(CFLAGS_STACKPROTECTOR)
>  LDFLAGS := -s
> 
> -- 
> 2.41.0