[Bug java/71917] [7 regression] libjava.jar/ReturnProxyTest.jar etc. FAIL

["ebotcazou at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71917

--- Comment #6 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
> Sorry for the bugs, I am however tempted to say this will turn out to be a
> libffi bug. You have described the same failure mode as I fixed for MIPS but
> libjava is now following the ffi return type rules so my assumption is that
> it is sparc ffi that is not. I've had a quick read of sparc ffi code and it
> seems there is a chance that integer return types are not being promoted to
> word size. I.e. following the ffi rule that integers smaller than a word are
> returned as type ffi_arg.

No, integer return types are of course promoted to word size as per the ABI.

It looks like the issue comes from FFI_SIZEOF_ARG not being defined for SPARC,
but it's not defined for many architectures as of this writing:

./tile/ffitarget.h:# define FFI_SIZEOF_ARG 8
./tile/ffitarget.h:# define FFI_SIZEOF_ARG 4
./mips/ffitarget.h:#  define FFI_SIZEOF_ARG    4
./mips/ffitarget.h:#  define FFI_SIZEOF_ARG    8
./x86/ffitarget.h:#define FFI_SIZEOF_ARG 8
./x86/ffitarget.h:#define FFI_SIZEOF_ARG 8
./aarch64/ffitarget.h:#define FFI_SIZEOF_ARG 8

so your change will probably break some others (64-bit PA comes to mind).