http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56033
Andreas Krebbel <krebbel at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |krebbel at gcc dot gnu.org
--- Comment #5 from Andreas Krebbel <krebbel at gcc dot gnu.org> 2013-04-08
11:19:16 UTC ---
Confirmed for s390x.
Looks like an endianess issue to me. In cls_struct_va1.c the void pointer to
the return value is cast to an int pointer before writing to it:
static void
test_fn (ffi_cif* cif __UNUSED__, void* resp,
void** args, void* userdata __UNUSED__)
{
...
* (int*) resp = 42;
}
But the pointer later on is expected to point to a register size value.
There are also testcases which do it differently (e.g. closure_fn0.c). They
cast the pointer to the return value to ffi_arg* before accessing it. ffi_arg
is defined to be a register size type. From the documentation I cannot tell
which one is supposed to be correct.
static void
closure_test_fn0(ffi_cif* cif __UNUSED__, void* resp, void** args,
void* userdata)
{
*(ffi_arg*)resp = ...
}
Btw. for both examples the return type is defined as &ffi_type_sint in
ffi_prep_cif
