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This is a missing SFINAE issue when verifying the accessibility of a static data member. The cause is that check_accessibility_of_qualified_id unconditionally passes tf_warning_or_error to perform_or_defer_access_check, even when called from tsubst_qualified_id(..., complain=tf_none). This patch fixes this by plumbing 'complain' from tsubst_qualified_id through check_accessibility_of_qualified_id to reach perform_or_defer_access_check, and by giving check_accessibility_of_qualified_id the appropriate return value. gcc/cp/ChangeLog: PR c++/90880 * cp-tree.h (check_accessibility_of_qualified_id): Add tsubst_flags_t parameter and change return type to bool. * parser.c (cp_parser_lookup_name): Pass tf_warning_to_error to check_accessibility_of_qualified_id. * pt.c (tsubst_qualified_id): Return error_mark_node if check_accessibility_of_qualified_id returns false. * semantics.c (check_accessibility_of_qualified_id): Add complain parameter. Pass complain instead of tf_warning_or_error to perform_or_defer_access_check. Return true unless perform_or_defer_access_check returns false. gcc/testsuite/ChangeLog: PR c++/90880 * g++.dg/template/sfinae29.C: New test.
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