How to handle variables (data, etc.) in DLLs?

[DJ Delorie]

DLLs *can't* export "data".  They can only export pointers to data,
which is what they do.  In older gccs, you'll need to do something
like this:

extern int *__imp_foo;
#define foo (*__imp_foo)

In newer gccs, do something like this:

extern int foo __attribute__((dllimport));

These tell gcc to dereference the imported pointer, rather than
thinking it's the data itself.

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