From: Junio C Hamano <gitster@pobox.com>
Date: Sat, 23 Jun 2007 06:19:55 GMT
Subject: Re: [PATCH]: tree-walk.h: Warning fix
Message-ID: <7v1wg39oqc.fsf@assigned-by-dhcp.pobox.com>
In-Reply-To: <20070619231127.7ffe273b@gnut>

"Luiz Fernando N. Capitulino" <lcapitulino@mandriva.com.br>
writes:

> diff --git a/tree-walk.h b/tree-walk.h
> index ee747ab..625198f 100644
> --- a/tree-walk.h
> +++ b/tree-walk.h
> @@ -22,7 +22,7 @@ static inline const unsigned char *tree_entry_extract(struct tree_desc *desc, co
>  
>  static inline int tree_entry_len(const char *name, const unsigned char *sha1)
>  {
> -	return (char *)sha1 - (char *)name - 1;
> +	return (const char *)sha1 - (const char *)name - 1;
>  }
>  
>  void update_tree_entry(struct tree_desc *);

Grumble.  Incoming "name" is already (const char*), isn't it?
I'd cast only the sha1 side and apply.

However, I think -Wcast-qual is a pretty useless option.  

The nastiest one, if you care, is exec_cmd.c::execv_git_cmd()
where we never muck with "const char **argv" ourselves, but we
have to call execve(), which takes (char**) as its second
parameter.  We cast away constness for that call; otherwise you
would then get prototype mismatch.