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I wonder which compiler it was?

Embarcadero C++ 2010, formerly known as Borland C++.

FWIW, their latest incarnation uses Clang as a front-end for at least the 64-bit version.

Me too. I posted a comment on the blog about it, maybe the author will respond there?

Saw a response from the author. The compiler is Embarcadero’s C++ Builder 2010.