[Bug target/60336] empty struct value is passed differently in C and C++

[jason at gcc dot gnu.org]

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

--- Comment #19 from Jason Merrill <jason at gcc dot gnu.org> ---
Created attachment 32228
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=32228&action=edit
HJ's test in dejagnu form

Here's HJ's testcase in a form that can be dropped into g++.dg/abi.