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    SubjectRe: [PATCH] tracing: properly align linker defined symbols
    On Sat, Jul 10, 2010 at 14:34, Steven Rostedt <rostedt@goodmis.org> wrote:
    > On Sat, 2010-07-10 at 13:18 +0300, Zeev Tarantov wrote:
    >> On Sat, Jul 10, 2010 at 09:35, Sam Ravnborg <sam@ravnborg.org> wrote:
    >
    >> > +/*
    >> > + * Align to a 32 byte boundary equal to the
    >> > + * alignment gcc 4.5 uses for a struct
    >> > + */
    >> > +#define STRUCT_ALIGN() . = ALIGN(32)
    >> > +
    >
    > What I'm nervous about is when gcc 4.8 decides to up the alignment to
    > 64.
    >
    > Maybe we should have both patches, just to be safe.
    >
    > -- Steve
    >

    I don't want to post obvious or inane suggests to the mailing list,
    but if you're worried about gcc changing the default alignment, the
    solution seems to be one of:
    1. Not relying on the default alignment and specifying explicitly what you want.
    2. Querying the default alignment before compilation, either using an
    API gcc may provide or (cumbersomely) by testing.

    -Zeev


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