------- Comment #12 from reichelt at gcc dot gnu dot org 2009-02-25 21:00
-------
The culprit is in the function pushdecl_maybe_friend:
Functions declared extern "C" bypass the usual mechanism, because
duplicate_decls isn't called for them (see lines 727ff):
else if ((DECL_EXTERN_C_FUNCTION_P (x)
|| DECL_FUNCTION_TEMPLATE_P (x))
&& is_overloaded_fn (t))
/* Don't do anything just yet. */;
else if (t == wchar_decl_node)
[...snip...]
else
{
tree olddecl = duplicate_decls (x, t, is_friend);
Later only the binding for such functions is compared, which doesn't
take default parameters into account (see line 778ff):
if ((TREE_CODE (x) == FUNCTION_DECL)
&& DECL_EXTERN_C_P (x)
/* We should ignore declarations happening in system headers. */
&& !DECL_IN_SYSTEM_HEADER (x))
{
cxx_binding *function_binding =
lookup_extern_c_fun_binding_in_all_ns (x);
if (function_binding
&& !DECL_IN_SYSTEM_HEADER (function_binding->value))
{
tree previous = function_binding->value;
/* In case either x or previous is declared to throw an
exception,
make sure both exception specifications are equal. */
if (decls_match (x, previous))
[...snip...]
}
}
if (TREE_CODE (x) == FUNCTION_DECL || DECL_FUNCTION_TEMPLATE_P (x))
check_default_args (x);
I'm not sure how to proceed from here, so unassigning.
--
reichelt at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |reichelt at gcc dot gnu dot
| |org
AssignedTo|reichelt at gcc dot gnu dot |unassigned at gcc dot gnu
|org |dot org
Status|REOPENED |NEW
Known to fail|3.4.6 4.0.3 4.1.0 4.1.1 |3.4.6 4.0.3 4.1.0 4.2.0
| |4.3.0
Known to work|3.3.6 3.4.0 3.4.5 4.0.2 |3.3.6 3.4.0 3.4.5 4.0.0
|4.0.4 4.1.2 |4.0.1 4.0.2
Target Milestone|4.0.4 |4.2.5
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28274
