Re: [PATCH 4/4] main: Don't add int to string

[Sergio Durigan Junior <sergiodj@sergiodj.net>]

On Wednesday, June 21 2017, Simon Marchi wrote:

> clang shows this warning:
>
>   /home/emaisin/src/binutils-gdb/gdb/main.c:227:56: error: adding 'int' to a string does not append to the string [-Werror,-Wstring-plus-int]
>                 char *tmp_sys_gdbinit = xstrdup (SYSTEM_GDBINIT + datadir_len);
>                                                  ~~~~~~~~~~~~~~~^~~~~~~~~~~~~
>   /home/emaisin/src/binutils-gdb/gdb/main.c:227:56: note: use array indexing to silence this warning
>                 char *tmp_sys_gdbinit = xstrdup (SYSTEM_GDBINIT + datadir_len);
>                                                                 ^
>                                                  &              [            ]
>
> It's quite easy to get rid of it by using &foo[len] instead of foo + len.
> I think this warning is relevant to keep enabled, because it can be an
> easy mistake to do.
>
> This warning is already discussed here in GCC bugzilla:
>
>   https://gcc.gnu.org/ml/gcc-patches/2017-06/msg00729.html
>
> and a patch series for it was submitted very recently.
>
> gdb/ChangeLog:
>
> 	* main.c (get_init_files): Replace "SYSTEM_GDBINIT +
> 	datadir_len" with "&SYSTEM_GDBINIT[datadir_len]".
> ---
>  gdb/main.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/gdb/main.c b/gdb/main.c
> index df4b111..9813041 100644
> --- a/gdb/main.c
> +++ b/gdb/main.c
> @@ -224,7 +224,7 @@ get_init_files (const char **system_gdbinit,
>  	    {
>  	      /* Append the part of SYSTEM_GDBINIT that follows GDB_DATADIR
>  		 to gdb_datadir.  */
> -	      char *tmp_sys_gdbinit = xstrdup (SYSTEM_GDBINIT + datadir_len);
> +	      char *tmp_sys_gdbinit = xstrdup (&SYSTEM_GDBINIT[datadir_len]);
>  	      char *p;
>  
>  	      for (p = tmp_sys_gdbinit; IS_DIR_SEPARATOR (*p); ++p)
> -- 
> 2.7.4

LGTM.

Thanks,

-- 
Sergio
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