[issue20160] broken ctypes calling convention on MSVC / 64-bit Windows (large structs)

[Patrick Stewart]

Patrick Stewart added the comment:

There's some confusion above about clang - that's completely irrelevant, the problem was using ctypes to call into libclang, not using clang to compile anything. The problem applies to any callback function that returns a struct larger than 8 bytes with any MSVC 64bit build of ctypes.

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<http://bugs.python.org/issue20160>
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