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

[pinskia at gcc dot gnu.org]

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

--- Comment #21 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Marc Glisse from comment #12)
> It is a bit alarming that gcc, clang and clang++ use one ABI and g++ uses a
> different (inferior) one (the incompatibility with clang++ should affect
> some standard library functions, though they are often inlined). Also,
> extern "C" is a calling convention marker, and it is rather disrespectful of
> g++ to ignore it, even if this is only about a non-standard (but documented)
> extension.

See http://gcc.gnu.org/ml/gcc-patches/2006-05/msg00868.html which was about
adding a warning for the extern "C" case.
And http://gcc.gnu.org/bugzilla/show_bug.cgi?id=10208 for the ABI difference in
the past about C/C++.

There is most likely more discussion about this in other threads too.