public inbox for gcc-bugs@sourceware.org
help / color / mirror / Atom feed
* [Bug c/64577] New: No -Wpadded warning on padding bitfields
@ 2015-01-12 23:17 chengniansun at gmail dot com
  2015-01-14 12:36 ` [Bug middle-end/64577] " mpolacek at gcc dot gnu.org
                   ` (2 more replies)
  0 siblings, 3 replies; 4+ messages in thread
From: chengniansun at gmail dot com @ 2015-01-12 23:17 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64577

            Bug ID: 64577
           Summary: No -Wpadded warning on padding bitfields
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: chengniansun at gmail dot com

It seems that GCC does not emit -Wpadded warnings on the padding of bit-fields. 



$: cat t.c
struct S1 {
    unsigned f0 : 17;
    unsigned f1 : 17;
};

int main(void) {
    struct S1 s1;
    return 0;
}
$: 
$: gcc-trunk -Wpadded t.c 
t.c:4:1: warning: padding struct size to alignment boundary [-Wpadded]
 };
 ^
$: 
$: clang-trunk -Wpadded t.c 
t.c:3:14: warning: padding struct 'struct S1' with 15 bits to align 'f1'
[-Wpadded]
    unsigned f1 : 17;
             ^
t.c:1:8: warning: padding size of 'struct S1' with 15 bits to alignment
boundary [-Wpadded]
struct S1 {
       ^
2 warnings generated.
$:


^ permalink raw reply	[flat|nested] 4+ messages in thread
* [Bug middle-end/64577] No -Wpadded warning on padding bitfields
  2015-01-12 23:17 [Bug c/64577] New: No -Wpadded warning on padding bitfields chengniansun at gmail dot com
@ 2015-01-14 12:36 ` mpolacek at gcc dot gnu.org
  2015-02-11  9:32 ` chengniansun at gmail dot com
  2015-02-11  9:47 ` mpolacek at gcc dot gnu.org
  2 siblings, 0 replies; 4+ messages in thread
From: mpolacek at gcc dot gnu.org @ 2015-01-14 12:36 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64577

Marek Polacek <mpolacek at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mpolacek at gcc dot gnu.org
          Component|c                           |middle-end

--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
-Wpadded is implemented in stor-layout.c, so moving to middle-end component.


^ permalink raw reply	[flat|nested] 4+ messages in thread
* [Bug middle-end/64577] No -Wpadded warning on padding bitfields
  2015-01-12 23:17 [Bug c/64577] New: No -Wpadded warning on padding bitfields chengniansun at gmail dot com
  2015-01-14 12:36 ` [Bug middle-end/64577] " mpolacek at gcc dot gnu.org
@ 2015-02-11  9:32 ` chengniansun at gmail dot com
  2015-02-11  9:47 ` mpolacek at gcc dot gnu.org
  2 siblings, 0 replies; 4+ messages in thread
From: chengniansun at gmail dot com @ 2015-02-11  9:32 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64577

--- Comment #2 from Chengnian Sun <chengniansun at gmail dot com> ---
(In reply to Marek Polacek from comment #1)
> -Wpadded is implemented in stor-layout.c, so moving to middle-end component.

Hi Marek, 

Is this bug confirmed? 

Thanks.


^ permalink raw reply	[flat|nested] 4+ messages in thread
* [Bug middle-end/64577] No -Wpadded warning on padding bitfields
  2015-01-12 23:17 [Bug c/64577] New: No -Wpadded warning on padding bitfields chengniansun at gmail dot com
  2015-01-14 12:36 ` [Bug middle-end/64577] " mpolacek at gcc dot gnu.org
  2015-02-11  9:32 ` chengniansun at gmail dot com
@ 2015-02-11  9:47 ` mpolacek at gcc dot gnu.org
  2 siblings, 0 replies; 4+ messages in thread
From: mpolacek at gcc dot gnu.org @ 2015-02-11  9:47 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64577

Marek Polacek <mpolacek at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2015-02-11
     Ever confirmed|0                           |1

--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Ok, confirming, I think that warning could be useful.


^ permalink raw reply	[flat|nested] 4+ messages in thread
end of thread, other threads:[~2015-02-11  9:47 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2015-01-12 23:17 [Bug c/64577] New: No -Wpadded warning on padding bitfields chengniansun at gmail dot com
2015-01-14 12:36 ` [Bug middle-end/64577] " mpolacek at gcc dot gnu.org
2015-02-11  9:32 ` chengniansun at gmail dot com
2015-02-11  9:47 ` mpolacek at gcc dot gnu.org

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).