How to determine -rdyamic / -Wl,--export-dynamic flags?

[Paul Smith]

Does anyone have a macro that will correctly determine when -rdynamic
and/or -Wl,--export-dynamic can be used?  I'm not using libtool but I'd
like my application to be built such that functions in it can be invoked
by dynamically loaded objects.

I saw http://www.mail-archive.com/address@hidden/msg15247.html but
there was no definitive response... has anyone come up with something
since then?

I'd prefer to not invoke a test executable, to preserve cross-compiling.

Thanks!

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