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c++: Fix ICE diagnosing incomplete type of overloaded function set [PR98356]

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In the linked PR the result of 'get_first_fn' is a USING_DECL against
the template parameter, to be filled in on instantiation. But we don't
actually need to get the first set of the member functions: it's enough
to know that we have a (possibly overloaded) member function at all.

	PR c++/98356

gcc/cp/ChangeLog:

	* typeck2.cc (cxx_incomplete_type_diagnostic): Don't assume
	'member' will be a FUNCTION_DECL (or something like it).

gcc/testsuite/ChangeLog:

	* g++.dg/pr98356.C: New test.

Signed-off-by: Nathaniel Shead <nathanieloshead@gmail.com>
This commit is contained in:
Nathaniel Shead 2024-03-05 01:59:41 +11:00
parent 77772f8a3d
commit 940586a635
2 changed files with 14 additions and 6 deletions
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11
gcc/cp/typeck2.cc
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@ -350,16 +350,15 @@ cxx_incomplete_type_diagnostic (location_t loc, const_tree value,
bad_member:
{
tree member = TREE_OPERAND (value, 1);
if (is_overloaded_fn (member))
member = get_first_fn (member);
if (DECL_FUNCTION_MEMBER_P (member)
&& ! flag_ms_extensions)
if (is_overloaded_fn (member) && !flag_ms_extensions)
{
gcc_rich_location richloc (loc);
/* If "member" has no arguments (other than "this"), then
add a fix-it hint. */
if (type_num_arguments (TREE_TYPE (member)) == 1)
member = MAYBE_BASELINK_FUNCTIONS (member);
if (TREE_CODE (member) == FUNCTION_DECL
&& DECL_OBJECT_MEMBER_FUNCTION_P (member)
&& type_num_arguments (TREE_TYPE (member)) == 1)
richloc.add_fixit_insert_after ("()");
complained = emit_diagnostic (diag_kind, &richloc, 0,
"invalid use of member function %qD "

9
gcc/testsuite/g++.dg/pr98356.C Normal file
View file

@ -0,0 +1,9 @@
// PR c++/98356
// { dg-do compile { target c++11 } }
template <template <typename> class T> struct S {
using A = T<int>;
using A::foo;
void foo ();
void bar () {foo.} // { dg-error "invalid use of member function" }
};