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098cf31aa2
Here we're failing to do SFINAE in build_op_call when looking up the class's operator() via lookup_fnfields, which calls lookup_member always with complain=tf_warning_or_error; from there we would complain about an ambiguous lookup for operator(). This patch fixes this by adding a tsubst_flags_t parameter to lookup_fnfields and adjusting all its callers appropriately. gcc/cp/ChangeLog: PR c++/78446 * call.c (build_op_call): Pass complain to lookup_fnfields. (build_special_member_call): Likewise. * class.c (type_requires_array_cookie): Pass tf_warning_or_error to lookup_fnfields. * cp-tree.h (lookup_fnfields): Add tsubst_flags_t parameter. * except.c (build_throw): Pass tf_warning_or_error to lookup_fnfields. * init.c (build_new_1): Pass complain to lookup_fnfields. * method.c (locate_fn_flags): Likewise. * name-lookup.c (lookup_name_real_1): Pass tf_warning_or_error to lookup_fnfields. * pt.c (tsubst_baselink): Pass complain to lookup_fnfields. * search.c (lookup_fnfields): New 'complain' parameter. Pass it to lookup_member. gcc/testsuite/ChangeLog: PR c++/78446 * g++.dg/template/sfinae31.C: New test.
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