From

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60336

GCC passes empty class as one-byte record.  On x86-64, it is always
passed on stack.
Clang skips empty class the same way as C empty struct.  Empty C++
class is a corner
case which isn't covered in psABI nor C++ ABI.  Should C++ ABI specify
how it is passed?


-- 
H.J.
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