linux-kernel - Re: [PATCH] btrfs: handle -Wmaybe-uninitialized with clang

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Date:   Fri, 30 Dec 2022 11:02:49 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     Tom Rix <trix@...hat.com>
Cc:     clm@...com, josef@...icpanda.com, dsterba@...e.com,
        ndesaulniers@...gle.com, wqu@...e.com, linux-btrfs@...r.kernel.org,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev
Subject: Re: [PATCH] btrfs: handle -Wmaybe-uninitialized with clang

On Fri, Dec 30, 2022 at 12:55:07PM -0500, Tom Rix wrote:
> The clang build reports this error
> error: unknown warning option '-Wmaybe-uninitialized'; did you mean '-Wuninitialized'? [-Werror,-Wunknown-warning-option]
> make[3]: *** [scripts/Makefile.build:252: fs/btrfs/super.o] Error 1
> 
> -Wmaybe-uninitialized is a gcc only flag.  Move to setting with cc-option.
> 
> Fixes: 1b19c4c249a1 ("btrfs: turn on -Wmaybe-uninitialized")
> Signed-off-by: Tom Rix <trix@...hat.com>

Thanks for the patch! Looks like I forgot to double back to this...

https://lore.kernel.org/Y6kgR4qnb23UdAEX@dev-arch.thelio-3990X/

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

> ---
>  fs/btrfs/Makefile | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/btrfs/Makefile b/fs/btrfs/Makefile
> index eca995abccdf..460eced3f5bd 100644
> --- a/fs/btrfs/Makefile
> +++ b/fs/btrfs/Makefile
> @@ -7,12 +7,12 @@ subdir-ccflags-y += -Wmissing-format-attribute
>  subdir-ccflags-y += -Wmissing-prototypes
>  subdir-ccflags-y += -Wold-style-definition
>  subdir-ccflags-y += -Wmissing-include-dirs
> -subdir-ccflags-y += -Wmaybe-uninitialized
>  condflags := \
>  	$(call cc-option, -Wunused-but-set-variable)		\
>  	$(call cc-option, -Wunused-const-variable)		\
>  	$(call cc-option, -Wpacked-not-aligned)			\
> -	$(call cc-option, -Wstringop-truncation)
> +	$(call cc-option, -Wstringop-truncation)		\
> +	$(call cc-option, -Wmaybe-uninitialized)
>  subdir-ccflags-y += $(condflags)
>  # The following turn off the warnings enabled by -Wextra
>  subdir-ccflags-y += -Wno-missing-field-initializers
> -- 
> 2.27.0
>