https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67559
Daniel Krügler <daniel.kruegler at googlemail dot com> changed:
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--- Comment #1 from Daniel Krügler <daniel.kruegler at googlemail dot com> ---
According the release notes of gcc 5 (https://gcc.gnu.org/gcc-5/changes.html)
this is by design:
"G++ now allows passing a non-trivially-copyable class via C varargs, which is
conditionally-supported with implementation-defined semantics in the standard.
This uses the same calling convention as a normal value parameter."
and as you already note this behaviour is supported by the C++11 standard.
