[Issue 18928] extern(C++) bad codegen, wrong calling convention

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18928

--- Comment #6 from Manu <turkeyman at gmail.com> ---
I recall a few years ago reading some article about MSVC breaking their ABI to
guarantee RVO, because C++11 and move semantics and all that.
I guess it needed to be efficient and therefore justified guaranteeing RVO
where previously it was an optimisation.

It's probably the case that extern(C++) was implemented before C++11 made it to
MSVC.

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