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    SubjectRe: [PATCH] TRACING: Fix a copmile warning
    From
    Hi,

    On Mon, Jul 25, 2011 at 7:49 PM, Steven Rostedt <rostedt@goodmis.org> wrote:
    > On Mon, 2011-07-25 at 18:38 -0400, Arnaud Lacombe wrote:
    >> Hi,
    >>
    >> On Mon, Jul 25, 2011 at 4:19 PM, Steven Rostedt <rostedt@goodmis.org> wrote:
    >> > On Mon, 2011-07-25 at 15:43 -0400, Arnaud Lacombe wrote:
    >> >
    >> >> Actually, we have a special uninitialized_var(x) macro to handle such
    >> >> false positive. From include/linux/compiler-gcc.h:
    >> >>
    >> >> /*
    >> >>  * A trick to suppress uninitialized variable warning without generating any
    >> >>  * code
    >> >>  */
    >> >> #define uninitialized_var(x) x = x
    >> >
    >> > I'm aware of that too, but I think that is inappropriate as well. As I
    >> > said, some versions of gcc report it, others don't. Seems that gcc 4.6.0
    >> > says this is an error where 4.5.1 does not (I just tried both).
    >> >
    >> did you ? gcc 4.5.1 from Fedora 14 definitively shows the warning:
    >
    > Heh, I didn't use Fedora's version. I wonder if they added a patch or
    > built it differently. I built my own 4.5.1 as well as my own 4.6.0.
    >
    I'd assume you're building with -O2, the warning only shows up at -Os,
    see my previous mail.

    - Arnaud
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