https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68009
Jan Hubicka <hubicka at gcc dot gnu.org> changed:
What |Removed |Added
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CC| |hubicka at gcc dot gnu.org
--- Comment #2 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
See implementation of stdarg_p in tree.c:
/* Return true if TYPE has a variable argument list. */
bool
stdarg_p (const_tree fntype)
{
function_args_iterator args_iter;
tree n = NULL_TREE, t;
if (!fntype)
return false;
FOREACH_FUNCTION_ARGS (fntype, t, args_iter)
{
n = t;
}
return n != NULL_TREE && n != void_type_node;
}
The calling convetion of stdarg functions need not to be compatible with
non-stdarg. This is the case of x86_64, too, where %rax sets number of SSE
registers used when calling variadic function.
So the fortran FE should produce a protottype that retuns true for stdarg_p.
This is done via build_varargs_function_type_array
