[PATCH] Change representation of dllexport/dllimport

[Reid Kleckner]

On Wed, Jul 10, 2013 at 9:31 PM, Bill Wendling <wendling at apple.com> wrote:

> My initial thought would be that adding new linkage types would be the way
> to go. However, if there are going to be a lot of them, then it's a
> combinatoric nightmare. If you can mix all other linkage types with the
> dll* types, then maybe it should be a new field (sub-linkage type?) in the
> GlobalValue object. Or even expand the size of the linkage field and make
> it a bit-mask with the dll linkage types.
>

I think this approach was essentially rejected in the original thread on
llvm-dev:
http://lists.cs.uiuc.edu/pipermail/llvmdev/2013-March/060646.html

Basically, it's a bit of a combinatoric nightmare.  We don't need the full
combination of (export, import) cross all linkages, but we need a bunch.

Again, I think dllexport/import should be visibilities.
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