libstdc++: Fix std::move_only_function for incomplete parameter types

The std::move_only_function::__param_t alias template attempts to
optimize argument passing for the invoker, by passing by rvalue
reference for types that are non-trivial or large. However, the
precondition for is_trivally_copyable makes it unsuitable for using
here, and can cause ODR violations. Just use is_scalar instead, and pass
all class types (even small, trivial ones) by value.

libstdc++-v3/ChangeLog:

	* include/bits/mofunc_impl.h (move_only_function::__param_t):
	Use __is_scalar instead of is_trivially_copyable.
	* testsuite/20_util/move_only_function/call.cc: Check parameters
	involving incomplete types.

0 files changed, 0 insertions, 0 deletions