[Libreoffice] Usefulness of --enable-dbgutil

[Noel Grandin]

Hi

I suspect you'll get much further if you try to run a debug build under the Visual Studio debugger.
The VS Debugger and the runtime debug library are designed to work together, so you'll probably get a much better idea
of what is going wrong.

-- Noel Grandin
(Would love to help, but I'm still trying to get a working build)

Tor Lillqvist wrote:
> Over the past month or so I have hacked, now and then, on making it
> possible to build master on Windows (i.e. with MSVC) with
> --enable-dbgutil, where --enable-dbgutil now means that the debugging
> C/C++ runtime is used (and _DEBUG is defined when compiling, which
> means that for much of the MSVC C++ library code in the headers more
> thorough debugging versions of methods are used).
>
> (If I understand correctly, in OOo --enable-dbgutil doesn't cause use
> of the debugging runtime; they seem to have abandoned that idea at
> some point. I didn't get the hint but still tried to...)
>
> Now then, when I run a LO built in such a way, I get unhandled
> exceptions (invalid pointer dereferences, use of uninitialised heap it
> seems, for instance) when doing some very basic things, like typing a
> single character into a fresh empty text document.
>
> This is more than what I had hoped for. I had expected to at most
> catch some obvious heap corruption in some rare corner case thanks to
> using the debugging runtime.
>
> Debugging this is not easy, it crashes inside the (Microsoft) C++
> library (headers), in iterator related code, called by the mark code
> in sw. I don't understand the implementation details of the C++
> library or the sw code...
>
> So I wonder, is this use of the debugging runtime pointless? Do we
> have anybody anyway that would 1) understand the code in some specific
> part of LO, in this case the mark stuff in Writer, 2) have a Windows
> build and debugging environment and be willing to work in it, and 3)
> understand the C++ library (the Microsoft implementation) well enough
> to see what is happening...
>
> Should I just give up and revert the changes to use _DEBUG and the
> debugging runtime? Or leave that there but don't try to actually use
> it any more?
>
> --tml
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