[LLVMdev] Feedback required on proper dllexport/import implementation

Anton Korobeynikov anton at korobeynikov.info
Wed Mar 27 13:39:32 PDT 2013

Hi Nico,

We already discussed this on IRC, I just wanted to mention something explicitly.

> 1. Add additional linkage type(s) for the combinations to
>    GlobalValue::LinkageTypes.
>    This appears to be the least invasive way, but adds new linkage types
>    to an already large list.
It also will require modifying all the existing code wrt linkonce
semantics of "dllexpport_odr" and "dllimport_odr" stuff. Which might
be nontrivial (it's hard to say anything in advance).

After all dllexport is basically the same as external linkage and
dllimport - as  well (but just decl). So, instead of adding new
entities here we'd think about the overall picture once again and make
dllexport / dllimport as some sort of flags?

Target-specific attributes seems the best solution here, but they
cannot be applied to globals. Maybe we'd think into this direction?

With best regards, Anton Korobeynikov
Faculty of Mathematics and Mechanics, Saint Petersburg State University

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