commit c061ad5a36ba0c07d3d9d82a85aebb887def759d
author Patrick Palka <ppalka@redhat.com> Tue Jan 28 09:27:02 2025 -0500
committer Patrick Palka <ppalka@redhat.com> Tue Jan 28 09:28:09 2025 -0500
tree b0f1cf59d7171402e698761bb469cd5fdf40b742
parent f8daec2ad9a20c31a98efb4602080e1e5d0c19fe

c++: friend vs inherited guide confusion [PR117855]

We recently started using the lang_decl_fn::context field to track
inheritedness of a deduction guide (for C++23 inherited CTAD).  This
new overloading of the field accidentally made DECL_FRIEND_CONTEXT
return non-NULL for inherited guides, which breaks the below testcase
during overload resolution with an inherited guide.

This patch fixes this by refining DECL_FRIEND_CONTEXT appropriately.

	PR c++/117855

gcc/cp/ChangeLog:

	* cp-tree.h (DECL_FRIEND_CONTEXT): Exclude deduction guides.

gcc/testsuite/ChangeLog:

	* g++.dg/cpp23/class-deduction-inherited7.C: New test.

Reviewed-by: Jason Merrill <jason@redhat.com>
(cherry picked from commit ea578dd251eaf6304b0c95acc107f9a4d63bee8f)