Does anyone have an autoconf recipe for detecting whether or not the export keyword works in your C++ compiler?

The autoconf archive has nothing (probably because gcc pre-3.x doesn't support export so it's hard to test), unfortunately. It's difficult because to test it properly, you need to compile two separate files (one with, say, exported template body, and another which instantiates the template) and see if linking correctly works.

I realise, of course, that there are varying degrees of "works" when it comes to export. :-)

Any suggestions would be gratefully received. I'll post a summary.