Op 9 dec. 2012 10:51 schreef "Kai Tietz" <ktiet...@googlemail.com> het
volgende:
>
> 2012/12/9 Václav Šmilauer <e...@doxos.eu>:
> > Hi,
> >
> > I understand gendef generates symbols from non-mingw DLLs so that linker
> > knows which symbols are defined.
>
> This feature is already in ld. And this feature of ld shows also why
> .def files are to be preferred.
>
> 1.) A .def file can be used to generate an import-library without the
> need of having *its* corresponding DLL-fille also on the system.
> 2.) Think about 64-bit Windows OSes, where ld either is able to see
> 32-bit or 64-bit system-dlls, as it is either a 32-bit or a 64-bit
> process.
> 3.) By a .def file you can generate easily also delayed-import-libraries.
> 4.) By a .def file you have the ability to mark explicit addtional
> symobol-properties, like DATA etc. You can't get this information
> always correct by the DLL itself.
>
> There are more advantages of .def files over the direct use of DLL files.
>
> > What is the reason to have gendef, instead of making the linker
understand
> > the PE(+) formats so that it can read exported symbols from the DLL
> > directly, at link time? Technical reasons? Lack of manpower? Historical?
>
> And this aren't historical reasons. See above. The use of .def files
> has simply none-avoidable technical causes.
>
> > Would it make sense to package gendef with the compiler, just like e.g.
> > dlltool?
>
> Hmm, it is release by us - mingw-w64 - as a standalong tool (we have
> more like that, but well the use of gendef is wider spreaded). I am
> working also on binutils - what you might mean by "package ... with
> the compiler", and well, gendef has no equivalence to an MS-tool, so
> I don't think it makes sense to add it there. As far as I know is
> gendef provided by us as cygwin-package - available through cygwin's
> setup - and Ruben provides it - IIRC - within his personal-build, too.
Now that you mention it, I think I forgot to add mingw-w64-tools to my
builds, I'll try to remember on the next update cycle.
Ruben
>
> > Cheers, Vaclav
>
> Hope I could answer your questions.
>
> Regards,
> Kai
>
>
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