linux-kernel - Re: [PATCH V2] sparse: Allow override of sizeof(bool) warning

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Message-ID: <20140227025845.GA25145@thin>
Date:	Wed, 26 Feb 2014 18:58:45 -0800
From:	Josh Triplett <josh@...htriplett.org>
To:	Joe Perches <joe@...ches.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>, linux-sparse@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V2] sparse: Allow override of sizeof(bool) warning

On Wed, Feb 26, 2014 at 06:53:14PM -0800, Joe Perches wrote:
> Allow an override to emit or not the sizeof(bool) warning
> Add a description to the manpage.
> 
> Signed-off-by: Joe Perches <joe@...ches.com>

Reviewed-by: Josh Triplett <josh@...htriplett.org>

>  evaluate.c | 3 ++-
>  lib.c      | 2 ++
>  lib.h      | 1 +
>  sparse.1   | 9 +++++++++
>  4 files changed, 14 insertions(+), 1 deletion(-)
> 
> diff --git a/evaluate.c b/evaluate.c
> index 6655615..a45f59b 100644
> --- a/evaluate.c
> +++ b/evaluate.c
> @@ -2057,7 +2057,8 @@ static struct symbol *evaluate_sizeof(struct expression *expr)
>  	}
>  
>  	if (size == 1 && is_bool_type(type)) {
> -		warning(expr->pos, "expression using sizeof bool");
> +		if (Wsizeof_bool)
> +			warning(expr->pos, "expression using sizeof bool");
>  		size = bits_in_char;
>  	}
>  
> diff --git a/lib.c b/lib.c
> index bf3e91c..676b72e 100644
> --- a/lib.c
> +++ b/lib.c
> @@ -225,6 +225,7 @@ int Wone_bit_signed_bitfield = 1;
>  int Wparen_string = 0;
>  int Wptr_subtraction_blows = 0;
>  int Wreturn_void = 0;
> +int Wsizeof_bool = 1;
>  int Wshadow = 0;
>  int Wtransparent_union = 0;
>  int Wtypesign = 0;
> @@ -437,6 +438,7 @@ static const struct warning {
>  	{ "paren-string", &Wparen_string },
>  	{ "ptr-subtraction-blows", &Wptr_subtraction_blows },
>  	{ "return-void", &Wreturn_void },
> +	{ "sizeof-bool", &Wsizeof_bool },
>  	{ "shadow", &Wshadow },
>  	{ "transparent-union", &Wtransparent_union },
>  	{ "typesign", &Wtypesign },
> diff --git a/lib.h b/lib.h
> index f09b338..7e3432f 100644
> --- a/lib.h
> +++ b/lib.h
> @@ -119,6 +119,7 @@ extern int Wone_bit_signed_bitfield;
>  extern int Wparen_string;
>  extern int Wptr_subtraction_blows;
>  extern int Wreturn_void;
> +extern int Wsizeof_bool;
>  extern int Wshadow;
>  extern int Wtransparent_union;
>  extern int Wtypesign;
> diff --git a/sparse.1 b/sparse.1
> index cd6be26..b4546be 100644
> --- a/sparse.1
> +++ b/sparse.1
> @@ -288,6 +288,15 @@ programs consider this poor style, and those programs can use
>  Sparse does not issue these warnings by default.
>  .
>  .TP
> +.B \-Wsizeof-bool
> +Warn when checking the sizeof a _Bool.
> +
> +C99 does not specify the sizeof a _Bool.  gcc uses 1.
> +
> +Sparse issues these warnings by default.  To turn them off, use
> +\fB\-Wno\-sizeof\-bool\fR.
> +.
> +.TP
>  .B \-Wshadow
>  Warn when declaring a symbol which shadows a declaration with the same name in
>  an outer scope.
> -- 
> 1.8.1.2.459.gbcd45b4.dirty
> 
> 
> 
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