I'd agree with the default behavior being off and the command being changed to an enable style. All targets we have worked with certainly default to off, or don't have the feature at all.

Colin


On 15/08/2014 01:45, Eric Christopher wrote:
I believe that disabling by default would match the gdb behavior yes? If nothing else, yes, I'm a fan of this :)

-eric
On Thu Aug 14 2014 at 5:30:52 PM Todd Fiala <tfi...@google.com <mailto:tfi...@google.com>> wrote:

    Hey all,

    Regarding this bug:
    http://llvm.org/bugs/show_bug.cgi?id=20658

    We've been discussing the idea of having ASLR disabled by default
    when launching processes within lldb.  Currently it looks like the
    default behavior is to have it enabled, and require explicitly
    disabling to get that behavior for the process.

    It seems like it might make more sense to have it disabled by
    default - that way code references would likely be static across
    debugger runs, which seems to be more what we want when tracking
    down issues across code runs.

    Any thoughts on this?

    The counterargument I could make for changing it would be (aside
    from legacy compatibility issues perhaps on the MacOSX/iOS side) -
    taking the exe out of its native state on the OS.  If a bug is
    ASLR sensitive, the user might miss it.  And so behavior in the
    debugger could differ from the exe in its native state.  Not sure
    how relevant that is for the majority of usages, though.

    I'll be fixing the fact that Linux is ignoring this altogether.
     But while I'm in there, I could flip the default if we wanted to
    do it.  If not globally, we'd probably pursue defaulting it on
    Linux (and Ed seems to like it for FreeBSD as well, so maybe for
    not Apple in that case?)
-- Todd Fiala | Software Engineer | tfi...@google.com
    <mailto:tfi...@google.com> |  650-943-3180


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