lkml.org 
[lkml]   [2013]   [Sep]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
SubjectRe: [PATCH V2] kconfig/menu.c: fix uninitialized variable warning
Madhavan, All,

On 2013-09-22 22:35 +0530, Madhavan Srinivasan spake thusly:
> In file included from scripts/kconfig/zconf.tab.c:2537:0:
> scripts/kconfig/menu.c: In function ‘get_symbol_str’:
> scripts/kconfig/menu.c:586:18: warning: ‘jump’ may be used uninitialized in
> this function [-Wmaybe-uninitialized]
> jump->offset = r->len - 1;
> ^
> scripts/kconfig/menu.c:547:19: note: ‘jump’ was declared here
> struct jump_key *jump;
> ^
> Change V2:
>
> 1)Added comment as suggested.

Maybe I'm mislead, but I think Benjamin and I suggested a comment that
explained the warning was just spurious, and there would be no code
change. Something like:

/* gcc 4.8.0 on (your distro and version) warns about 'jump may be
* used uninitialized', which is wrong. The warning does not appear
* with gcc != 4.8.0 */
struct jump_key *jump;

This is so, if sometime in the future the code changes, and the variable
is indeeded used uninitialised, we have a proper warning by gcc in this
case.

Care to resend, please?

Regards,
Yann E. MORIN.

> Signed-off-by: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
> ---
> scripts/kconfig/menu.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/scripts/kconfig/menu.c b/scripts/kconfig/menu.c
> index c1d5320..32ee2d5 100644
> --- a/scripts/kconfig/menu.c
> +++ b/scripts/kconfig/menu.c
> @@ -544,7 +544,8 @@ static void get_prompt_str(struct gstr *r, struct property *prop,
> {
> int i, j;
> struct menu *submenu[8], *menu, *location = NULL;
> - struct jump_key *jump;
> + /* Initializing to avoid a spurious warning observed in gcc 4.8.0 */
> + struct jump_key *jump = NULL;
>
> str_printf(r, _("Prompt: %s\n"), _(prop->text));
> menu = prop->menu->parent;
> --
> 1.7.10.4
>

--
.-----------------.--------------------.------------------.--------------------.
| Yann E. MORIN | Real-Time Embedded | /"\ ASCII RIBBON | Erics' conspiracy: |
| +33 662 376 056 | Software Designer | \ / CAMPAIGN | ___ |
| +33 223 225 172 `------------.-------: X AGAINST | \e/ There is no |
| http://ymorin.is-a-geek.org/ | _/*\_ | / \ HTML MAIL | v conspiracy. |
'------------------------------^-------^------------------^--------------------'
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2013-09-26 19:21    [W:0.042 / U:0.300 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site