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Okay, sorry, read your original comment backwards.

Calling into C++ is generally a big problem in any programming language though, and for most, you have to write a C wrapper.

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Not a problem for Julia: https://github.com/Keno/Cxx.jl

Looks like that uses Clang/LLVM. Does it work with C++ libraries built with GCC or MSVC?

MSVC: probably not; Clang's MSVC ABI support is coming along well, but last time I checked there was no COFF support in the JIT. GCC on Itanium ABI platforms should be fine, although mixing C++ stdlib versions would be risky (primarily an issue on OS X).

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