| Re: [AD] 4.9 on MSVC 2008 |
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On July 11, 2008, Elias Pschernig wrote:
> On Fri, 2008-07-11 at 04:28 -0600, Thomas Fjellstrom wrote:
> > Its mainly used to make sure all symbols are in the same place and order
> > they were in previous and future dlls. dll's are indexed by a simple
> > integer under the hood, so if a symbol changes places, its not going to
> > be found in the right spot. Or at least that's how I understood it. (all
> > new symbols are appended to the end, none are removed, and none move)
>
> I think we switch to symbol lookup - I guess it was a slight performance
> advantage 10 years ago, but I doubt it can make a measurable difference
> today. Of course, assuming DLL linking/loading can be made to do symbol
> lookup, and someone can figure out how to do it..
>
> Compatibility with existing .exes expecting to load the .dll with symbol
> lookup is no problem with 4.9 - so now would be the perfect time to
> change. But well, I'm assuming a lot of how things works, I have no idea
> about DLLs. Google suggests though that the lookup-by-index we are
> apparently using is only an optional feature.
I wasn't aware that Win32 PE-COFF DLLs were capable of anything more complex
than lookup by index.
> --
> Elias Pschernig <elias@xxxxxxxxxx>
>
>
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--
Thomas Fjellstrom
tfjellstrom@xxxxxxxxxx