[lldb-dev] Transitioning to Linux local debugging via lldb-gdbserver

[Zachary Turner]

Perhaps obvious, but please make sure it's only the default on Linux.

On Mon Feb 09 2015 at 1:34:58 PM Vince Harron <vharron at google.com> wrote:

> Hi all,
>
> As you may have noticed, we have been busily adding remote debugging
> support to Linux.  One of the processes that run on the remote target is
> lldb-gdbserver (or llgs for short).
>
> We have also been working on a second path for debugging local linux
> processes.  instead of lldb calling the ptrace APIs directly, it launches
> an llgs instance and communicates with it via the remote debug protocol.
>
> This has two advantages.
>
> 1) There is more code shared between the remote debugging code path and
> the local debugging code path.  If a feature works in remote, it probably
> works locally and vice-versa.
>
> 2) It makes us more architecturally similar to OSX (which also does local
> debugging via a connection to debugserver).
>
> This path is called LLGS local.  We think that this configuration is now
> at parity with (or better than) local linux debugging.
>
> It is currently invoked if you have an environment variable defined
> "PLATFORM_LINUX_FORCE_LLGS_LOCAL"
>
> We would like to switch to LLGS local as the default path and only use the
> non-LLGS path if someone has an environment variable defined
> "PLATFORM_LINUX_DISABLE_LLGS_LOCAL"
>
> Later, if all goes well, we would like to remove non-LLGS local debugging
> support to simplify the codebase and avoid confusion.
>
> Thoughts?
>
> Vince
>
> --
>
> Vince Harron | Technical Lead Manager | vharron at google.com | 858-442-0868
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>
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