Daily bump.

[thirdparty/gcc.git] / gcc / cp / ChangeLog

2020-12-22  Nathan Sidwell  <nathan@acm.org>

        * module.cc (has_definition): Check DECL_LANG_SPECIFIC.

2020-12-22  Jakub Jelinek  <jakub@redhat.com>

        PR c++/93480
        * method.c (common_comparison_type): If comps[i] is a TREE_LIST,
        use its TREE_VALUE instead.
        (build_comparison_op): Handle array members.

2020-12-22  Gerald Pfeifer  <gerald@pfeifer.com>

        * module.cc (INCLUDE_STRING): Define.
        (INCLUDE_VECTOR): Ditto.

2020-12-22  Jason Merrill  <jason@redhat.com>

        * mangle.c (write_member_name): Add assert.
        (write_expression): Add asserts.

2020-12-21  Nathan Sidwell  <nathan@acm.org>

        * module.cc (create_dirs): Add logging.
        (finish_module_processing): Unlink before rename.

2020-12-21  Nathan Sidwell  <nathan@acm.org>

        PR bootstrap/98412
        * mapper-client.cc: INCLUDE_STRING, INCLUDE_VECTOR.
        (module_client::open_module_client): Avoid std::stoul.
        * mapper-resolver.cc: INCLUDE_STRING, INCLUDE_VECTOR.

2020-12-18  Kwok Cheung Yeung  <kcy@codesourcery.com>

        * cp-lang.c (cxx_get_decl_init): New.
        (cxx_omp_finish_decl_inits): New.
        (LANG_HOOKS_GET_DECL_INIT): New.
        (LANG_HOOKS_OMP_FINISH_DECL_INITS): New.
        * cp-tree.h (dynamic_initializers): New.
        * decl.c (dynamic_initializers): New.
        * decl2.c (c_parse_final_cleanups): Add initializer entries
        from vars to dynamic_initializers.

2020-12-18  Nathan Sidwell  <nathan@acm.org>

        * module.cc (O_CLOEXEC, O_BINARY): Add window's support.
        (elf_in::defrost, module_state::do_import)
        (finish_module_processing): Use O_BINARY.

2020-12-18  Jakub Jelinek  <jakub@redhat.com>

        PR c++/98343
        * cp-gimplify.c (source_location_table_entry_hash::pch_nx): Override
        static member functions from ggc_remove.

2020-12-18  Patrick Palka  <ppalka@redhat.com>

        * constraint.cc (satisfying_constraint): Move up definition
        and give it bool type.
        (failed_type_completion_count): Replace with ...
        (failed_type_completions): ... this.
        (note_failed_type_completion_for_satisfaction): Append the
        supplied argument to failed_type_completions.
        (some_type_complete_p): Define.
        (sat_entry::maybe_unstable): Replace with ...
        (sat_entry::ftc_begin, sat_entry::ftc_end): ... these.
        (satisfaction_cache::ftc_count): Replace with ...
        (satisfaction_cache::ftc_begin): ... this.
        (satisfaction_cache::satisfaction_cache): Adjust accordingly.
        (satisfaction_cache::get): Adjust accordingly, using
        some_type_complete_p.
        (satisfaction_cache::save): Adjust accordingly.
        (satisfying_constraint_p): Remove unused function.
        (satisfy_constraint): Set satisfying_constraint.
        (satisfy_declaration_constraints): Likewise.
        * decl.c (require_deduced_type): Call
        note_failed_type_completion_for_satisfaction.

2020-12-18  Patrick Palka  <ppalka@redhat.com>

        * constraint.cc (sat_entry::evaluating): New member.
        (satisfaction_cache::get): If entry->evaluating, diagnose
        self-recursive satisfaction.  Otherwise, set entry->evaluating
        if we're not reusing a cached satisfaction result.
        (satisfaction_cache::save): Clear entry->evaluating.
        (satisfy_atom): Set up diagnosing_failed_constraint before the
        first call to get().

2020-12-18  Patrick Palka  <ppalka@redhat.com>

        * constraint.cc (failed_type_completion_count): New.
        (note_failed_type_completion_for_satisfaction): New.
        (sat_entry::constr): Rename to ...
        (sat_entry::atom): ... this.
        (sat_entry::location): New member.
        (sat_entry::maybe_unstable): New member.
        (sat_entry::diagnose_instability): New member.
        (struct sat_hasher): Adjust after the above renaming.
        (get_satisfaction, save_satisfaction): Remove.
        (satisfaction_cache): Rewrite completely.
        (satisfy_atom): When instantiation of the parameter mapping
        fails, set diagnose_instability.  Propagate location from
        inst_cache.entry to cache.entry if the secondary lookup
        succeeded.
        (satisfy_declaration_constraints): When
        failed_type_completion_count differs before and after
        satisfaction, then don't cache the satisfaction result.
        * cp-tree.h (note_failed_type_completion_for_satisfaction):
        Declare.
        * pt.c (tsubst) <case TYPENAME_TYPE>: Use
        complete_type_or_maybe_complain instead of open-coding it.
        * typeck.c (complete_type_or_maybe_complain): Call
        note_failed_type_completion_for_satisfaction when type
        completion fails.

2020-12-17  Nathan Sidwell  <nathan@acm.org>

        PR c++/98340
        * module.cc (uintset<T>::hash::add): Use uintset (0u).MEMBER,
        rather than uintset::MEMBER.

2020-12-17  Nathan Sidwell  <nathan@acm.org>

        PR bootstrap/98300
        * module.cc: Fix ::read, ::write result signedness comparisons.

2020-12-16  Nathan Sidwell  <nathan@acm.org>

        * mapper-resolver.cc: Remove early include of
        sys/socket.h.  Specify no CODY_NETWORKING instead.
        * module.cc: Specify no CODY_NETWORKING.

2020-12-16  Nathan Sidwell  <nathan@acm.org>

        * parser.c (cp_parser_elaborated_type_specifier): Test
        BOUND_TEMPLATE_TEMPLATE_PARM before checking for instantiation.

2020-12-16  Nathan Sidwell  <nathan@acm.org>

        * module.cc (dumper::push): Clangify offsetof use.

2020-12-16  Nathan Sidwell  <nathan@acm.org>

        * mapper-resolver.cc: #include sys/socket before system.h
        due to poisoned bcopy use.

2020-12-16  Nathan Sidwell  <nathan@acm.org>

        * module.cc (loc_spans): Make spans a pointer, not inline.
        Adjust all accesses.

2020-12-16  Nathan Sidwell  <nathan@acm.org>

        * mapper-client.cc: Include sys/socket.h before system.h.

2020-12-15  Patrick Palka  <ppalka@redhat.com>

        * pt.c (in_template_function): Inspect cfun->decl instead of
        current_function_decl.

2020-12-15  Nathan Sidwell  <nathan@acm.org>

        * module.cc: Replace stubs with implementation.

2020-12-15  Nathan Sidwell  <nathan@acm.org>

        * Make-lang.in (CXX_AND_OBJCXX_OBJS): Add mapper-client &
        mapper-resolver.
        * mapper-client.h: New.
        * mapper-client.cc: New.
        * mapper-resolver.cc: New.

2020-12-15  Nathan Sidwell  <nathan@acm.org>

        * name-lookup.c (do_namespace_alias): Set originating module
        before pushing.

2020-12-11  Jason Merrill  <jason@redhat.com>

        PR libstdc++/97600
        * call.c (build_user_type_conversion_1): Avoid considering
        conversion functions that return a clearly unsuitable type.

2020-12-11  Jason Merrill  <jason@redhat.com>

        * cp-tree.h (make_binding_vec): Add CXX_MEM_STAT_INFO.

2020-12-11  Nathan Sidwell  <nathan@acm.org>

        * config-lang.in (gtfiles): Add cp/module.cc.
        * decl2.c (c_parse_final_cleanups): Add module support.
        * lambda.c (record_lambda_scope): Call maybe_attach_decl.
        * module.cc (maybe_attach_decl, lazy_load_specializations): Stubs.
        (finish_module_procesing): Stub.
        * pt.c (lookup_template_class_1): Lazy load specializations.
        (instantiate_template_1): Likewise.

2020-12-11  Nathan Sidwell  <nathan@acm.org>

        * decl2.c (c_parse_final_cleanups): Refactor loop.

2020-12-11  Nathan Sidwell  <nathan@acm.org>

        * cp-tree.h (map_context_from, map_context_to): Declare.
        * module.cc (map_context_from, map_context_to): Define.
        * tree.c (cp_tree_equal): Check map_context_{from,to} for parm
        context difference.  Allow NON_LVALUE_EXPR and VIEW_CONVERT_EXPR
        with null types.

2020-12-11  Nathan Sidwell  <nathan@acm.org>

        * cp-lang.c (LANG_HOOKS_PREPROCESS_MAIN_FILE): Override.
        (LANG_HOOKS_PREPROCESS_OPTIONS): Override.
        (LANG_HOOKS_PREPROCESS_TOKEN): Override.
        * cp-objcp-common.c (cp_register_dumps): Add module dump.
        (cp_handle_option): New.
        * cp-objcp-common.h (cp_handle_option): Declare.
        (LANG_HOOKS_HANDLE_OPTION): Override.
        * cp-tree.h (module_dump_id): Declare.
        * module.cc (module_dump_id): Define.
        (module_begin_main_file, handle_module_option)
        (module_preproces_options): Stubs.

2020-12-11  Nathan Sidwell  <nathan@acm.org>

        * module.cc (lazy_specializations_p): Stub.
        * name-lookup.h (append_imported_binding_slot)
        (mergeable_namespacE_slots, lookup_class_binding)
        (walk_module_binding, import_module_binding, set_module_binding)
        (note_pending_specializations, load_pending_specializations)
        (add_module_decl, add_imported_namespace): Declare.
        (get_cxx_dialect_name): Declare.
        (enum WMB_flags): New.
        * name-lookup.c (append_imported_binding_slot)
        (mergeable_namespacE_slots, lookup_class_binding)
        (walk_module_binding, import_module_binding, set_module_binding)
        (note_pending_specializations, load_pending_specializations)
        (add_module_decl, add_imported_namespace): New.
        (get_cxx_dialect_name): Make extern.

2020-12-11  Patrick Palka  <ppalka@redhat.com>

        PR c++/78173
        * typeck.c (pointer_diff): Use complete_type_or_maybe_complain
        instead of complete_type_or_else.

2020-12-10  Jason Merrill  <jason@redhat.com>

        * cp-tree.h (struct type_identity): New.
        (make_temp_override): New.
        * decl.c (grokdeclarator): Use it.
        * except.c (maybe_noexcept_warning): Use it.
        * parser.c (cp_parser_enum_specifier): Use it.
        (cp_parser_parameter_declaration_clause): Use it.
        (cp_parser_gnu_attributes_opt): Use it.
        (cp_parser_std_attribute): Use it.

2020-12-10  Nathan Sidwell  <nathan@acm.org>

        * name-lookup.c (do_nonmember_using_decl): Add INSERT_P parm.
        Deal with exporting using decls.
        (finish_nonmember_using_decl): Examine BINDING_VECTOR.

2020-12-10  Nathan Sidwell  <nathan@acm.org>

        * cp-tree.h (visible_instantiation_path): Renamed.
        * module.cc (get_originating_module_decl, lazy_load_binding)
        (lazy_load_members, visible_instantiation_path): Stubs.
        * name-lookup.c (STAT_TYPE_VISIBLE_P, STAT_VISIBLE): New.
        (search_imported_binding_slot, init_global_partition)
        (get_fixed_binding_slot): New.
        (name_lookup::process_module_binding): New.
        (name_lookup::search_namespace_only): Search BINDING_VECTOR.
        (name_lookup::adl_namespace_fns): Likewise.
        (name_lookip::search_adl): Search visible instantiation path.
        (maybe_lazily_declare): Maybe lazy load members.
        (implicitly_exporT_namespace): New.
        (maybe_record_mergeable_decl): New.
        (check_module_override): New.
        (do_pushdecl): Deal with BINDING_VECTOR, check override.
        (add_mergeable_namespace_entity): New.
        (get_namespace_binding): Deal with BINDING_VECTOR.
        (do_namespace_alias): Call set_originating_module.
        (lookup_elaborated_type_1): Deal with BINDING_VECTOR.
        (do_pushtag): Call set_originating_module.
        (reuse_namespace): New.
        (make_namespace_finish): Add FROM_IMPORT parm.
        (push_namespace): Deal with BINDING_VECTOR & namespace reuse.
        (maybe_save_operator_binding): Save when module CMI in play.
        * name-lookup.h (add_mergeable_namespace_entity): Declare.

2020-12-10  Nathan Sidwell  <nathan@acm.org>

        * name-lookup.c: Include bitmap.h.
        (enum binding_slots): New.
        (maybe_add_fuzzy_binding): Return bool true if found.
        (consider_binding_level): Add module support.
        * module.cc (get_import_bitmap): Stub.

2020-12-10  Nathan Sidwell  <nathan@acm.org>

        * name-lookup.c (pop_local_binding): Check for IDENTIFIER_ANON_P.
        (update_binding): Level may be null, don't add namespaces to
        level.
        (newbinding_bookkeeping): New, broken out of ...
        (do_pushdecl): ... here, call it.  Don't push anonymous decls.
        (pushdecl, add_using_namespace): Correct comments.
        (do_push_nested_namespace): Remove assert.
        (make_namespace, make_namespace_finish): New, broken out of ...
        (push_namespace): ... here.  Call them.  Add namespace to level
        here.

2020-12-10  Nathan Sidwell  <nathan@acm.org>

        * error.c (dump_module_suffix): New.
        (dump_aggr_type, dump_simple_decl, dump_function_name): Call it.
        * ptree.c (cxx_print_decl): Print module information.
        * module.cc (module_name, get_importing_module): Stubs.

2020-12-10  Nathan Sidwell  <nathan@acm.org>

        * name-lookup.h (set_class_bindings): Return vector, take signed
        'extra' parm.
        * name-lookup.c (maybe_lazily_declare): Break out ...
        (get_class_binding): .. of here, call it.
        (find_member_slot): Adjust get_class_bindings call.
        (set_class_bindings): Allow -ve extra.  Return the vector.
        (set_identifier_type_value_with_scope): Remove checking assert.
        (lookup_using_decl): Set decl's context.
        (do_pushtag): Adjust set_identifier_type_value_with_scope handling.

2020-12-09  Nathan Sidwell  <nathan@acm.org>

        * parser.h (struct cp_token): Add main_source_p field.
        * parser.c (cp_lexer_new_main): Pass thought module token filter.
        Check macros.
        (cp_lexer_get_preprocessor_token): Set main_source_p.
        (enum module_parse): New.
        (cp_parser_diagnose_invalid_type_name): Deal with unrecognized
        module-directives.
        (cp_parser_skip_to_closing_parenthesize_1): Skip module-directivres.
        (cp_parser_skip_to_end_of_statement): Likewise.
        (cp_parser_skiup_to_end_of_block_or_statement): Likewise.
        (cp_parser_translation_unit): Add module parsing calls.
        (cp_parser_module_name, cp_parser_module_declaration): New.
        (cp_parser_import_declaration, cp_parser_module_export): New.
        (cp_parser_declaration): Add module export detection.
        (cp_parser_template_declaration): Adjust 'export' error message.
        (cp_parser_function_definition_after_declarator): Add
        module-specific logic.
        * module.cc (import_module, declare_module)
        (maybe_check_all_macros): Stubs.

2020-12-09  Marek Polacek  <polacek@redhat.com>

        PR c++/97517
        * cxx-pretty-print.c (cxx_pretty_printer::simple_type_specifier): Handle
        NULLPTR_TYPE.
        (pp_cxx_type_specifier_seq): Likewise.
        (cxx_pretty_printer::type_id): Likewise.

2020-12-09  Nathan Sidwell  <nathan@acm.org>

        * decl.c (duplicate_decls): Add module-specific redeclaration
        logic.
        (cxx_init_decl_processing): Export the global namespace, maybe
        initialize modules.
        (start_decl): Reject local-extern in a module, adjust linkage of
        template var.
        (xref_tag_1): Add module-specific redeclaration logic.
        (start_enum): Likewise.
        (finish_enum_value_list): Export unscoped members of an exported
        enum.
        (grokmethod): Implement p1779 linkage of in-class defined
        functions.
        * decl2.c (no_linkage_error): Imports are ok.
        (c_parse_final_cleanups): Call fini_modules.
        * lex.c (cxx_dup_lang_specific): Clear some module flags in the
        copy.
        * module.cc (module_kind): Define.
        (module_may_redeclare, set_defining_module): Stubs.
        (init_modules): Error on modules.
        (fini_modules): Stub.
        * rtti.c (push_abi_namespace): Save and reset module_kind.
        (pop_abi_namespace): Restore module kind.
        (build_dynamic_cast_1, tinfo_base_init): Adjust.
        * semantics.c (begin_class_definition): Add module-specific logic.
        (expand_or_defer_fn_1): Keep bodies of more fns when modules_p.

2020-12-09  Tobias Burnus  <tobias@codesourcery.com>

        * parser.c (cp_parser_omp_allocate): New.
        (cp_parser_omp_construct, cp_parser_pragma): Call it.

2020-12-09  Jason Merrill  <jason@redhat.com>

        PR c++/98019
        * cvt.c (maybe_warn_nodiscard): Check c_inhibit_evaluation_warnings.

2020-12-09  Jason Merrill  <jason@redhat.com>

        PR c++/59238
        * init.c (expand_default_init): Pass tf_no_cleanup when building
        a TARGET_EXPR to go on the RHS of an INIT_EXPR.
        * typeck.c (cp_build_modify_expr): Likewise.

2020-12-08  Marek Polacek  <polacek@redhat.com>

        PR c++/98103
        * constexpr.c (cxx_eval_dynamic_cast_fn): If the evaluating of vtable
        yields a null pointer, give an error and return.  Use objtype.

2020-12-08  Nathan Sidwell  <nathan@acm.org>

        * class.c (layout_class_type): Call set_instantiating_module.
        (build_self_reference): Likewise.
        * decl.c (grokfndecl): Call set_originating_module.
        (grokvardecl): Likewise.
        (grokdeclarator): Likewise.
        * pt.c (maybe_new_partial_specialization): Call
        set_instantiating_module, propagate DECL_MODULE_EXPORT_P.
        (lookup_template_class_1): Likewise.
        (tsubst_function_decl): Likewise.
        (tsubst_decl, instantiate_template_1): Likewise.
        (build_template_decl): Propagate module flags.
        (tsubst_template_dcl): Likewise.
        (finish_concept_definition): Call set_originating_module.
        * module.cc (set_instantiating_module, set_originating_module): Stubs.

2020-12-08  Jason Merrill  <jason@redhat.com>

        PR c++/96299
        * cp-tree.h (build_new_op): Add overload that omits some parms.
        (genericize_spaceship): Add location_t parm.
        * constexpr.c (cxx_eval_binary_expression): Pass it.
        * cp-gimplify.c (genericize_spaceship): Pass it.
        * method.c (genericize_spaceship): Handle class-type arguments.
        (build_comparison_op): Fall back to op</== when appropriate.

2020-12-08  Jason Merrill  <jason@redhat.com>

        * call.c (build_new_op_1): Set *overload for ambiguity.
        (build_new_method_call_1): Likewise.

2020-12-08  Bernd Edlinger  <bernd.edlinger@hotmail.de>

        * decl2.c: (is_atomic_expensive_p): New helper function.
        (build_atomic_load_byte): Rename to...
        (build_atomic_load_type): ... and add new parameter type.
        (get_guard_cond): Skip the atomic here if that is expensive.
        Use the correct type for the atomic load on certain targets.

2020-12-08  Nathan Sidwell  <nathan@acm.org>

        * cp-tree.h (struct tinst_level): Add path & visible fields.
        (build_cdtor_clones): Declare.
        (match_mergeable_specialization): Use a spec_entry, add insert parm.
        * class.c (build_cdtor_clones): Externalize.
        * pt.c (push_tinst_level_loc): Clear new fields.
        (match_mergeable_specialization): Adjust API.

2020-12-08  Nathan Sidwell  <nathan@acm.org>

        * decl2.c (start_objects): Refactor and adjust for named module
        initializers.
        (finish_objects): Likewise.
        (generate_ctor_or_dtor_function): Likewise.
        * module.cc (module_initializer_kind)
        (module_add_import_initializers): Stubs.

2020-12-08  Nathan Sidwell  <nathan@acm.org>

        * Make-lang.in (MODULE_VERSION): Override when DEVPHASE not empty.
        * module.cc: Comment.

2020-12-08  Nathan Sidwell  <nathan@acm.org>

        * cp-tree.h (mangle_module_substitution, mangle_identifier)
        (mangle_module_global_init): Declare.
        * mangle.c (struct globals): Add mod field.
         (mangle_module_substitution, mangle_identifier)
        (mangle_module_global_init): Define.
        (write_module, maybe_write_module): New.
        (write_name): Call it.
        (start_mangling): Clear mod field.
        (finish_mangling_internal): Adjust.
        * module.cc (mangle_module, mangle_module_fini)
        (get_originating_module): Stubs.

2020-12-08  Nathan Sidwell  <nathan@acm.org>

        * cp-tree.h (module_token_pre, module_token_cdtor)
        (module_token_lang): Declare.
        * lex.c: Include langhooks.
        (struct module_token_filter): New.
        * cp-tree.h (module_token_pre, module_token_cdtor)
        (module_token_lang): Define.
        * module.cc (get_module, preprocess_module, preprocessed_module):
        Nop stubs.

2020-12-08  Nathan Sidwell  <nathan@acm.org>

        * Make-lang.in (MODULE_VERSION): Define.
        * module.cc: Add includes.

2020-12-08  Jakub Jelinek  <jakub@redhat.com>

        PR c++/98187
        * parser.c (cp_parser_omp_parallel): For parallel master with
        -fopenmp-simd only, just call cp_parser_omp_master instead of
        wrapping it in OMP_PARALLEL.

2020-12-07  Marek Polacek  <polacek@redhat.com>

        PR c++/98043
        * decl.c (pop_switch): If SWITCH_STMT_TYPE is a scoped enum type,
        set it to the type of SWITCH_STMT_COND.

2020-12-07  Nathan Sidwell  <nathan@acm.org>

        * cp-tree.h (build_cplus_array_type): Add defaulted DEP parm.
        * tree.c (set_array_type_common): Add DEP parm.
        (build_cplus_array_type): Add DEP parm, determine dependency if
        needed.  Mark dependency of new types.
        (cp_build_qualified_type_real): Adjust array-building call, assert
        no surprising dependency.
        (strip_typedefs): Likewise.

2020-12-07  Nathan Sidwell  <nathan@acm.org>

        PR c++/98116
        * typeck.c (structural_comptypes): Move early outs to comptype.
        Always check template-alias match when comparing_specializations.
        (comptypes): Do early out checking here.

2020-12-05  Patrick Palka  <ppalka@redhat.com>

        PR c++/97093
        * constraint.cc (parameter_mapping_equivalent_p): Add some
        sanity checks.  Clarify comment.
        (tsubst_nested_requirement): Always perform satisfaction
        quietly first.  If that yields an erroneous result, emit a
        context message and replay satisfaction noisily with the
        diagnostic normal form.
        (finish_nested_requirement): Normalize the constraint-expression
        twice, once with diagnostic information and once without.  Store
        them in a TREE_LIST within the TREE_TYPE.
        (diagnose_nested_requirement): When replaying satisfaction, use
        the diagnostic normal form instead of renormalizing on the spot.

2020-12-05  Patrick Palka  <ppalka@redhat.com>

        PR c++/97093
        * constraint.cc (struct sat_info): Define.
        (tsubst_nested_requirement): Pass a sat_info object to
        satisfy_constraint.
        (satisfy_constraint_r): Take a sat_info argument instead of
        subst_info.
        (satisfy_conjunction): Likewise.
        (satisfy_disjunction): Likewise.  Instead of first evaluating
        each branch quietly, evaluate each branch only with
        unsatisfaction diagnostics disabled.  Exit early if evaluation
        of a branch returns error_mark_node.
        (satisfy_atom): Take a sat_info argument instead of subst_info.
        Fix a comment.  Check diagnose_unsatisfaction_p() instead of
        noisy() before replaying a substitution failure.
        (satisfy_constraint): Take a sat_info argument instead of
        subst_info.
        (satisfy_associated_constraints): Likewise.
        (satisfy_constraint_expression): Likewise.
        (satisfy_declaration_constraints): Likewise.
        (constraint_satisfaction_value): Likewise and adjust
        accordingly.  Fix formatting.
        (constraints_satisfied_p): Pass a sat_info object to
        constraint_satisfaction_value.
        (evaluate_concept_check): Pass a sat_info object to
        satisfy_constraint_expression.
        (diagnose_nested_requirement): Likewise.
        (diagnose_constraints): Pass an appropriate sat_info object to
        constraint_satisfaction_value.

2020-12-05  Jakub Jelinek  <jakub@redhat.com>

        PR c++/98122
        * constexpr.c (cxx_union_active_member): New function.
        (cxx_fold_indirect_ref_1): Add ctx argument, pass it through to
        recursive call.  Handle UNION_TYPE.
        (cxx_fold_indirect_ref): Add ctx argument, pass it to recursive calls
        and cxx_fold_indirect_ref_1.
        (cxx_eval_indirect_ref): Adjust cxx_fold_indirect_ref calls.

2020-12-04  Jason Merrill  <jason@redhat.com>

        PR c++/93083
        * pt.c (convert_template_argument): Handle equivalent placeholders.
        (do_class_deduction): Look through EXPR_PACK_EXPANSION, too.

2020-12-04  Jason Merrill  <jason@redhat.com>

        * decl2.c (clear_consteval_vfns): Remove *.
        * pt.c (do_auto_deduction): Remove *.
        * parser.c (cp_parser_late_parsing_default_args): Change loop
        to use range 'for'.

2020-12-04  Nathan Sidwell  <nathan@acm.org>

        PR c++/98116
        * cp-tree.h (comparing_typenames): Delete.
        (cplus_build_array_type): Remove default parm.
        * pt.c (comparing_typenames): Delete.
        (spec_hasher::equal): Don't increment it.
        * tree.c (set_array_type_canon): Remove dep parm.
        (build_cplus_array_type): Remove dep parm changes.
        (cp_build_qualified_type_real): Remove dependent array type
        changes.
        (strip_typedefs): Likewise.
        * typeck.c (structural_comptypes): Revert comparing_typename
        changes.

2020-12-04  Nathan Sidwell  <nathan@acm.org>

        * cp-tree.h: Add various inline module state predicates, and
        declare the API that will be provided by modules.cc

2020-12-04  Jakub Jelinek  <jakub@redhat.com>

        PR c++/80780
        * cp-gimplify.c (fold_builtin_source_location): Use 2 instead of 0
        as last argument to cxx_printable_name.

2020-12-03  Jason Merrill  <jason@redhat.com>

        * cp-tree.h (releasing_vec::operator[]): Change parameter type to
        ptrdiff_t.

2020-12-03  Nathan Sidwell  <nathan@acm.org>

        * cp-tree.h (OVL_EXPORT): New.
        (class ovl_iterator): Add get_using, exporting_p.
        * tree.c (ovl_insert): Extend using_or_hidden meaning to include
        an exported using.

2020-12-03  Nathan Sidwell  <nathan@acm.org>

        * cp-tree.h (DECL_UNINSTANTIATED_TEMPLATE_FRIEND): New.
        * pt.c (push_template_decl): Set it.
        (tsubst_friend_function): Clear it.

2020-12-03  Nathan Sidwell  <nathan@acm.org>

        * cp-tree.h (make_unbound_class_template_raw): Declare.
        (canonical_type_parameter): Declare.
        * decl.c (make_unbound_class_template_raw): Break out of ...
        (make_unboud_class_template): ... here.  Call it.
        * pt.c (canonical_type_parameter): Externalize.  Refactor & set
        structural_equality for type parms.

2020-12-03  Nathan Sidwell  <nathan@acm.org>

        PR c++/98107
        * tree.c (build_cplus_array_type): Mark dependency of new variant.
        (cp_build_qualified_type_real, strip_typedefs): Assert
        TYPE_DEPENDENT_P_VALID, or not a dependent type.

2020-12-03  Jakub Jelinek  <jakub@redhat.com>

        PR libstdc++/93121
        * cp-tree.h (cp_build_bit_cast): Declare.
        * cp-tree.def (BIT_CAST_EXPR): New tree code.
        * cp-objcp-common.c (names_builtin_p): Handle RID_BUILTIN_BIT_CAST.
        (cp_common_init_ts): Handle BIT_CAST_EXPR.
        * cxx-pretty-print.c (cxx_pretty_printer::postfix_expression):
        Likewise.
        * parser.c (cp_parser_postfix_expression): Handle
        RID_BUILTIN_BIT_CAST.
        * semantics.c (cp_build_bit_cast): New function.
        * tree.c (cp_tree_equal): Handle BIT_CAST_EXPR.
        (cp_walk_subtrees): Likewise.
        * pt.c (tsubst_copy): Likewise.
        * constexpr.c (check_bit_cast_type, cxx_eval_bit_cast): New functions.
        (cxx_eval_constant_expression): Handle BIT_CAST_EXPR.
        (potential_constant_expression_1): Likewise.
        * cp-gimplify.c (cp_genericize_r): Likewise.

2020-12-03  Jason Merrill  <jason@redhat.com>

        * parser.c (cp_parser_primary_expression): Distinguish
        parms from vars in error.
        (cp_parser_late_parsing_default_args): Pushdecl parms
        as we go.

2020-12-03  Jason Merrill  <jason@redhat.com>

        * name-lookup.c (begin_scope): Set immediate_fn_ctx_p.
        * parser.c (cp_parser_late_parsing_default_args): Push
        sk_function_parms scope.

2020-12-03  Peter Bergner  <bergner@linux.ibm.com>

        PR c++/97947
        * typeck2.c (digest_init_r): Handle OPAQUE_TYPE as an aggregate type.

2020-12-02  Jakub Jelinek  <jakub@redhat.com>

        PR c++/80780
        PR c++/93093
        * cp-tree.h (source_location_current_p): Declare.
        * tree.c (source_location_current_p): New function.
        * call.c (immediate_invocation_p): New function.
        (build_over_call): Use it to resolve LWG3396.
        * constexpr.c (cxx_eval_builtin_function_call): Temporarily set
        current_function_decl from ctx->call->fundef->decl if any.
        * cp-gimplify.c (cp_genericize_r) <case CALL_EXPR>: Fold calls
        to immediate function std::source_location::current ().

2020-12-02  Jason Merrill  <jason@redhat.com>

        * decl.c (grokdeclarator): Improve diagnostic for
        disallowed CTAD placeholder.

2020-12-02  Jason Merrill  <jason@redhat.com>

        * decl.c (check_initializer): Also look through STMT_EXPR
        and BIND_EXPR.

2020-12-02  Nathan Sidwell  <nathan@acm.org>

        * cp-tree.h (comparing_typenames): Declare.
        * pt.c (comparing_typenames): Define.
        (spec_hasher::equal): Increment it around comparisons.
        * typeck.c (structural_comptypes): Adjust TYPENAME resolution
        check.

2020-12-02  Marek Polacek  <polacek@redhat.com>

        PR c++/97975
        * constexpr.c (fold_non_dependent_init): Add a tree parameter.
        Use it.
        * cp-tree.h (fold_non_dependent_init): Add a tree parameter with
        a default value.
        * typeck2.c (store_init_value): Call fold_non_dependent_expr
        only when checking the initializer for constexpr variables.
        Call fold_non_dependent_init instead of maybe_constant_init.

2020-12-02  Marek Polacek  <polacek@redhat.com>

        PR c++/97187
        PR c++/97993
        * pt.c (tsubst_copy_and_build) <case NEW_EXPR>: Return error_mark_node
        if init is erroneous.

2020-12-02  Nathan Sidwell  <nathan@acm.org>

        * cp-tree.h (DECL_MODULE_PURVIEW_P, DECL_MODULE_IMPORT_P)
        (DECL_MODULE_ENTITY_P): New.
        (DECL_MODULE_PENDING_SPECIALIZATIONS_P): New.
        (DECL_MODULE_PENDING_MEMBERS_P): New.
        (DECL_MODULE_ATTACHMENTS_P): New.
        (DECL_MODULE_EXPORT_P): New.
        (struct lang_decl_base): Shrink sel field.  Add new
        module-specific fields.

2020-12-02  Nathan Sidwell  <nathan@acm.org>

        * cp-tree.h (DECL_TINFO_P): Also for TYPE_DECLs.
        (get_tinfo_decl_direct): Declare.
        (get_pseudo_tinfo_index, get_pseudo_tinfo_type): Declare.
        * rtti.c (get_tinfo_decl_direct): Externalize.
        (get_tinfo_desc): Set DECL_TINFO_P on the typedef.
        (get_pseudo_tinfo_index, get_pseudo_tinfo_type): New.

2020-12-02  Nathan Sidwell  <nathan@acm.org>

        * cp-tree.h (maybe_add_lang_decl_raw, maybe_add_lang_type_raw):
        Declare.
        * lex.c (maybe_add_lang_decl_raw, maybe_add_lang_type_raw):
        Externalize, reformat.

2020-12-02  Nathan Sidwell  <nathan@acm.org>

        * cp-tree.h (build_cplus_array_type): Add defaulted DEP parm.
        * tree.c (set_array_type_common): Add DEP parm.
        (build_cplus_array_type): Add DEP parm, determine dependency if
        needed.
        (cp_build_qualified_type_real): Adjust array-building call.
        (strip_typedefs): Likewise.

2020-12-02  Nathan Sidwell  <nathan@acm.org>

        * ptree.c (cxx_print_xnode): Increase binding-vector prefix size.

2020-12-02  Nathan Sidwell  <nathan@acm.org>

        * cp-tree.def (BINDING_VECTOR): New.
        * name-lookup.h (struct binding_slot): New.
        (BINDING_VECTOR_SLOTS_PER_CLUSTER): New.
        (struct binding_index, struct binding_cluster): New.
        (BINDING_VECTOR_ALLOC_CLUSTERS, BINDING_VECTOR_CLUSTER_BASE)
        (BINDING_VECTOR_CLUSTER): New.
        (struct tree_binding_vec): New.
        (BINDING_VECTOR_NAME, BINDING_VECTOR_GLOBAL_DUPS_P)
        (BINDING_VECTOR_PARTITION_DUPS_P): New.
        (BINDING_BINDING_GLOBAL_P, BINDING_BINDING_PARTITION_P): New.
        (BINDING_VECTOR_PENDING_SPECIALIZATIONS)
        (BINDING_VECTOR_PENDING_IS_HEADER_P)
        (BINDING_VECTOR_PENDING_IS_PARTITION_P): New.
        * cp-tree.h (enum cp_tree_node_structure_enum): Add
        TS_CP_BINDING_VECTOR.
        (union lang_tree_node): Add binding_vec field.
        (make_binding_vec): Declare.
        (named_decl_hash::hash, named_decl_hash::equal): Check for binding
        vector.
        * decl.c (cp_tree_node_structure): Add BINDING_VECTOR case.
        * ptree.c (cxx_print_xnode): Add BINDING_VECTOR case.
        * tree.c (make_binding_vec): New.

2020-12-01  Ville Voutilainen  <ville.voutilainen@gmail.com>

        PR c++/98054
        * cxx-pretty-print.c (pp_cxx_trait_expression):
        Add support for __is_nothrow_{assignable,constructible}.

2020-12-01  Jakub Jelinek  <jakub@redhat.com>

        PR c++/98072
        * parser.c (cp_parser_omp_depobj): Suppress location wrappers when
        parsing depend clause.

2020-12-01  Nathan Sidwell  <nathan@acm.org>

        * lex.c (init_reswords): Maybe enable module keywords.

2020-12-01  Nathan Sidwell  <nathan@acm.org>

        * lang-specs.h: Add module-related options.

2020-12-01  Iain Sandoe  <iain@sandoe.co.uk>

        * parser.c (cp_parser_declaration): Add a not about where
        attributes may be placed.

2020-11-27  Martin Sebor  <msebor@redhat.com>

        * error.c (add_quotes): Revert previous change and use pragma to
        suppress -Wformat-diag.

2020-11-26  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

        * g++spec.c (TIMELIB, TIME_LIBRARY): Remove.
        (lang_specific_driver): Remove TIME_LIBRARY handling.

2020-11-26  Thomas Schwinge  <thomas@codesourcery.com>

        * parser.c (cp_parser_omp_var_list_no_open): Assert that array
        section's 'low_bound', 'length' are not location wrapper nodes.
        (cp_parser_oacc_all_clauses, cp_parser_oacc_cache): Instantiate
        'auto_suppress_location_wrappers'.

2020-11-25  Martin Sebor  <msebor@redhat.com>

        PR bootstrap/94982
        * constraint.cc (debug_argument_list): Avoid -Wformat-diag.
        * error.c (function_category): Same.
        (print_template_differences): Same.
        * logic.cc (debug): Same.
        * name-lookup.c (lookup_using_decl): Same.
        * parser.c (maybe_add_cast_fixit): Same.
        (cp_parser_template_introduction): Same.
        * typeck.c (access_failure_info::add_fixit_hint): Same.

2020-11-25  Thomas Schwinge  <thomas@codesourcery.com>

        * pt.c (tsubst_omp_clauses): Handle 'OMP_CLAUSE__CACHE_'.
        (tsubst_expr): Handle 'OACC_CACHE'.

2020-11-24  Jason Merrill  <jason@redhat.com>

        PR c++/97899
        * typeck2.c (store_init_value): Don't split_nonconstant_init in a
        template.

2020-11-24  Jakub Jelinek  <jakub@redhat.com>

        PR tree-optimization/96929
        * constexpr.c (cxx_eval_binary_expression): For shifts by constant
        with MSB set, emulate older wide_int_binop behavior to preserve
        diagnostics and -fpermissive behavior.

2020-11-23  Nathan Sidwell  <nathan@acm.org>

        * module.cc: New dummy file.
        * Make-lang.in: Add rules to build module.o

2020-11-23  Jozef Lawrynowicz  <jozef.l@mittosystems.com>

        * decl.c (start_decl): Set DECL_INITIAL for initialized decls
        before attribute processing.

2020-11-23  Richard Sandiford  <richard.sandiford@arm.com>

        PR c++/97904
        * pt.c (tsubst): Use verify_type_context to check the type
        of an array element.

2020-11-21  Marek Polacek  <polacek@redhat.com>

        PR c++/94695
        * parser.c (warn_for_range_copy): Warn when the loop variable is
        initialized with a value of a different type resulting in a copy.

2020-11-21  Marek Polacek  <polacek@redhat.com>

        PR c++/97846
        * constexpr.c (potential_constant_expression_1): Reject
        LABEL_EXPRs that use non-artifical LABEL_DECLs.

2020-11-21  Marek Polacek  <polacek@redhat.com>

        PR c++/97881
        * parser.c (warn_about_ambiguous_parse): Only assume "int" if we
        actually saw any type-specifiers.

2020-11-21  Marek Polacek  <polacek@redhat.com>

        PR c++/97839
        * parser.c (cp_parser_lambda_declarator_opt): Don't require ().

2020-11-21  Marek Polacek  <polacek@redhat.com>

        PR c++/97427
        * constexpr.c (cxx_set_object_constness): New function.
        (cxx_eval_call_expression): Set new_obj for destructors too.
        Call cxx_set_object_constness to set/unset TREE_READONLY of
        the object under construction/destruction.

2020-11-21  Aaron Sawdey  <acsawdey@linux.ibm.com>

        * error.c (dump_type): Handle opaque types.
        (dump_type_prefix): Handle opaque types.
        (dump_type_suffix): Handle opaque types.
        (dump_expr): Handle opaque types.
        * pt.c (tsubst): Allow opaque types in templates.
        (unify): Allow opaque types in templates.
        * typeck.c (structural_comptypes): Handle comparison
        of opaque types.

2020-11-20  Jakub Jelinek  <jakub@redhat.com>

        PR other/97911
        * Make-lang.in (c++.serial): Change from goal to a variable.
        (.PHONY): Drop c++.serial and c++.prev.
        (cc1plus$(exeext)): Depend on $(c++.serial) rather than c++.serial.

2020-11-19  Nathan Sidwell  <nathan@acm.org>

        * cp-tree.h (struct spec_entry): Moved from pt.c.
        (walk_specializations, match_mergeable_specialization)
        (get_mergeable_specialization_flags)
        (add_mergeable_specialization): Declare.
        * pt.c (struct spec_entry): Moved to cp-tree.h.
        (walk_specializations, match_mergeable_specialization)
        (get_mergeable_specialization_flags)
        (add_mergeable_specialization): New.

2020-11-19  Nathan Sidwell  <nathan@acm.org>

        * cp-tree.h (struct constexpr_fundef): Moved from constexpr.c.
        (maybe_save_constexpr_fundef): Declare.
        (register_constexpr_fundef): Take constexpr_fundef object, return
        void.
        * decl.c (mabe_save_function_definition): Delete, functionality
        moved to maybe_save_constexpr_fundef.
        (emit_coro_helper, finish_function): Adjust.
        * constexpr.c (struct constexpr_fundef): Moved to cp-tree.h.
        (constexpr_fundef_hasher::equal): Constify.
        (constexpr_fundef_hasher::hash): Constify.
        (retrieve_constexpr_fundef): Make non-static.
        (maybe_save_constexpr_fundef): Break out checking and duplication
        from ...
        (register_constexpr_fundef): ... here.  Just register the constexpr.

2020-11-19  Marek Polacek  <polacek@redhat.com>

        PR c++/97523
        * init.c (build_new): When value-initializing an array new,
        leave the INIT as an empty vector.

2020-11-19  Marek Polacek  <polacek@redhat.com>

        PR c++/97895
        * pt.c (do_auto_deduction): Don't crash when the constructor has
        zero elements.

2020-11-19  Nathan Sidwell  <nathan@acm.org>

        PR c++/97905
        * decl.c (duplicate_decls): Relax new assert.

2020-11-18  Iain Sandoe  <iain@sandoe.co.uk>

        * parser.c (cp_parser_objc_valid_prefix_attributes): Check
        for empty attributes.

2020-11-18  Jakub Jelinek  <jakub@redhat.com>

        * Make-lang.in (c++.serial): New goal.
        (.PHONY): Add c++.serial c++.prev.
        (cc1plus$(exeext)): Depend on c++.prev.  Call LINK_PROGRESS.

2020-11-17  Nathan Sidwell  <nathan@acm.org>

        PR c++/97877
        * decl.c (duplicate_decls): Deal with duplicated DECL_LOCAL_DECL_P
        decls.  Extend decl_lang_specific checking assert.

2020-11-17  Nathan Sidwell  <nathan@acm.org>

        * cp-tree.h (enum cp_tree_index): Reorder to place lazy fields
        after newly-added CPTI_MODULE_HWM.

2020-11-17  Iain Sandoe  <iain@sandoe.co.uk>

        PR c++/97871
        * parser.c (cp_parser_declaration): Remove checking assert.

2020-11-15  Jason Merrill  <jason@redhat.com>

        * decl.c (cp_finish_decl): Only check abstractness on definition.
        (require_complete_types_for_parms): Check abstractness here.
        (create_array_type_for_decl): Not here.
        (grokdeclarator, grokparms, complete_vars): Not here.
        * pt.c (tsubst, tsubst_arg_types, tsubst_function_type): Not here.
        * typeck2.c (struct pending_abstract_type): Remove.
        (struct abstract_type_hasher): Remove.
        (abstract_pending_vars, complete_type_check_abstract): Remove.
        (abstract_virtuals_error_sfinae): Handle arrays.
        * call.c (conv_is_prvalue): Split out from...
        (conv_binds_ref_to_prvalue): ...here.
        (implicit_conversion_1): Rename from implicit_conversion.
        (implicit_conversion): An abstract prvalue is bad.
        (convert_like_internal): Don't complain if expr is already
        error_mark_node.

2020-11-13  Jason Merrill  <jason@redhat.com>

        * cp-tree.h (USING_DECL_UNRELATED_P): New.
        (CONST_DECL_USING_P): New.
        * class.c (handle_using_decl): If USING_DECL_UNRELATED_P,
        clone the CONST_DECL.
        * name-lookup.c (supplement_binding_1): A clone hides its
        using-declaration.
        (lookup_using_decl): Rewrite to separate lookup and validation.
        (do_class_using_decl): Adjust.
        (finish_nonmember_using_decl): Adjust.
        * parser.c (make_location): Add cp_token overload.
        (finish_using_decl): Split out from...
        (cp_parser_using_declaration): ...here.  Don't look through enums.
        (cp_parser_using_enum): New.
        (cp_parser_block_declaration): Call it.
        (cp_parser_member_declaration): Call it.
        * semantics.c (finish_id_expression_1): Handle enumerator
        used from class scope.

2020-11-13  Vladimir N. Makarov  <vmakarov@redhat.com>

        * parser.c (cp_parser_asm_definition): Parse outputs for asm
        goto too.

2020-11-13  Iain Sandoe  <iain@sandoe.co.uk>

        PR objc/77404
        * parser.c (cp_parser_objc_class_interface): Pass the
        location of the class name to the interface declaration.

2020-11-13  Patrick Palka  <ppalka@redhat.com>

        * semantics.c (finish_compound_literal): Don't wrap the original
        compound literal in a TARGET_EXPR when inside a template.

2020-11-12  Jakub Jelinek  <jakub@redhat.com>

        PR c++/97790
        * constexpr.c (cxx_eval_constant_expression) <case CLEANUP_POINT_EXPR,
        case TRY_FINALLY_EXPR, case CLEANUP_STMT>: Don't pass jump_target to
        cxx_eval_constant_expression when evaluating the cleanups.

2020-11-11  Iain Sandoe  <iain@sandoe.co.uk>

        * parser.c (cp_parser_declaration): Unless we are compiling for
        Ojective-C++, warn about and discard any attributes that prefix
        a linkage specification.

2020-11-11  Patrick Palka  <ppalka@redhat.com>

        PR c++/88115
        * mangle.c (write_expression): Mangle __alignof_ differently
        from alignof when the ABI version is at least 15.

2020-11-11  Patrick Palka  <ppalka@redhat.com>

        PR c++/88115
        * cp-tree.h (cxx_sizeof_or_alignof_expr): Add bool parameter.
        * decl.c (fold_sizeof_expr): Pass false to
        cxx_sizeof_or_alignof_expr.
        * parser.c (cp_parser_unary_expression): Pass std_alignof to
        cxx_sizeof_or_alignof_expr.
        * pt.c (tsubst_copy): Pass false to cxx_sizeof_or_alignof_expr.
        (tsubst_copy_and_build): Pass std_alignof to
        cxx_sizeof_or_alignof_expr.
        * typeck.c (cxx_alignof_expr): Add std_alignof bool parameter
        and pass it to cxx_sizeof_or_alignof_type.  Set ALIGNOF_EXPR_STD_P
        appropriately.
        (cxx_sizeof_or_alignof_expr): Add std_alignof bool parameter
        and pass it to cxx_alignof_expr.  Assert op is either
        SIZEOF_EXPR or ALIGNOF_EXPR.

2020-11-11  Marek Polacek  <polacek@redhat.com>

        PR c++/97518
        * pt.c (tsubst_qualified_id): Use EXPR_LOCATION of the qualified-id.
        Use it to maybe_wrap_with_location the final expression.

2020-11-10  Marek Polacek  <polacek@redhat.com>

        PR c++/97518
        * cp-tree.h (finish_static_assert): Adjust declaration.
        * parser.c (cp_parser_static_assert): Pass false to
        finish_static_assert.
        * pt.c (tsubst_expr): Pass true to finish_static_assert.
        * semantics.c (find_failing_clause_r): New function.
        (find_failing_clause): New function.
        (finish_static_assert): Add a bool parameter.  Use
        iloc_sentinel.  Call contextual_conv_bool instead of
        perform_implicit_conversion_flags.  Don't check for INTEGER_CST before
        calling integer_zerop.  Call find_failing_clause and maybe use its
        location.  Print the original condition or the failing clause if
        SHOW_EXPR_P.

2020-11-10  Strager Neds  <strager.nds@gmail.com>

        * decl.c (duplicate_decls): Use new overload of
        set_decl_section_name.
        * method.c (use_thunk): Same.
        * optimize.c (maybe_clone_body): Same.
        * coroutines.cc (act_des_fn): Same.

2020-11-10  Jakub Jelinek  <jakub@redhat.com>

        PR c/97748
        * cvt.c (convert_to_void): Check (complain & tf_warning) in the outer
        if rather than twice times in the inner one.  Use warn_if_unused_value.
        Formatting fix.

2020-11-10  Chung-Lin Tang  <cltang@codesourcery.com>

        * parser.c (cp_parser_omp_target_data): Add use of
        new c_omp_adjust_map_clauses function. Add GOMP_MAP_ATTACH_DETACH as
        handled map clause kind.
        (cp_parser_omp_target_enter_data): Likewise.
        (cp_parser_omp_target_exit_data): Likewise.
        (cp_parser_omp_target): Likewise.
        * semantics.c (handle_omp_array_sections): Adjust COMPONENT_REF case to
        use GOMP_MAP_ATTACH_DETACH map kind for C_ORT_OMP region type. Fix
        interaction between reference case and attach/detach.
        (finish_omp_clauses): Adjust bitmap checks to allow struct decl and
        same struct field access to co-exist on OpenMP construct.

2020-11-09  Marek Polacek  <polacek@redhat.com>

        DR 1914
        * parser.c (cp_parser_check_std_attribute): Return bool.  Add a
        location_t parameter.  Return true if the attribute wasn't duplicated.
        Give a warning instead of an error.  Check more attributes.
        (cp_parser_std_attribute_list): Don't add duplicated attributes to
        the list.  Pass location to cp_parser_check_std_attribute.

2020-11-09  Patrick Palka  <ppalka@redhat.com>

        * constraint.cc (norm_info::norm_info): Initialize orig_decl.
        (norm_info::orig_decl): New data member.
        (normalize_atom): When caching an atom for the first time,
        compute a list of template parameters used in the targets of the
        parameter mapping and store it in the TREE_TYPE of the mapping.
        (get_normalized_constraints_from_decl): Set current_function_decl
        appropriately when normalizing.  As an optimization, don't
        set up a push_nested_class_guard when decl has no constraints.
        (sat_hasher::hash): Use this list to hash only the template
        arguments that are relevant to the atom.
        (satisfy_atom): Use this list to compare only the template
        arguments that are relevant to the atom.
        * pt.c (keep_template_parm): Do a sanity check on the parameter's
        index when flag_checking.

2020-11-09  Patrick Palka  <ppalka@redhat.com>

        * cp-tree.h (ATOMIC_CONSTR_MAP_INSTANTIATED_P): Define this flag
        for ATOMIC_CONSTRs.
        * constraint.cc (sat_hasher::hash): Use hash_atomic_constraint
        if the flag is set, otherwise keep using a pointer hash.
        (sat_hasher::equal): Return false if the flag's setting differs
        on two atoms.  Call atomic_constraints_identical_p if the flag
        is set, otherwise keep using a pointer equality test.
        (satisfy_atom): After instantiating the parameter mapping, form
        another ATOMIC_CONSTR using the instantiated mapping and query
        the cache again.  Cache the satisfaction value of both atoms.
        (diagnose_atomic_constraint): Simplify now that the supplied
        atom has an instantiated mapping.

2020-11-09  Patrick Palka  <ppalka@redhat.com>

        * constraint.cc (atom_cache): Define this deletable hash_table.
        (normalize_atom): Use it to cache ATOMIC_CONSTRs when not
        generating diagnostics.
        (sat_hasher::hash): Use htab_hash_pointer instead of
        hash_atomic_constraint.
        (sat_hasher::equal): Test for pointer equality instead of
        atomic_constraints_identical_p.
        * cp-tree.h (struct atom_hasher): Moved and renamed from ...
        * logic.cc (struct constraint_hash): ... here.
        (clause::m_set): Adjust accordingly.

2020-11-09  Patrick Palka  <ppalka@redhat.com>

        PR c++/93907
        * constraint.cc (tsubst_parameter_mapping): Also canonicalize
        the type arguments of a TYPE_ARGUMENT_PACk.

2020-11-09  Jason Merrill  <jason@redhat.com>

        * pt.c (tsubst): Replace *_ARGUMENT_PACK code with
        a call to tsubst_argument_pack.

2020-11-09  Jason Merrill  <jason@redhat.com>

        * class.c (handle_using_decl): Add an iloc_sentinel.

2020-11-09  Marek Polacek  <polacek@redhat.com>

        PR c++/97762
        * parser.c (warn_about_ambiguous_parse): Handle the case when
        there is no type in the decl-specifiers.

2020-11-09  Nathan Sidwell  <nathan@acm.org>

        * cp-tree.h (LOOKUP_FOUND_P): Add ENUMERAL_TYPE.
        * name-lookup.c (class name_lookup): Add comments.
        (name_lookup::adl_namespace_only): Replace with ...
        (name_lookup::adl_class_fns): ... this and ...
        (name_lookup::adl_namespace_fns): ... this.
        (name_lookup::adl_namespace): Deal with inline nests here.
        (name_lookup::adl_class): Complete the type here.
        (name_lookup::adl_type): Call broken-out enum ..
        (name_lookup::adl_enum): New.  No need to call the namespace adl
        if it is class-scope.
        (name_lookup::search_adl): Iterate over collected scopes here.

2020-11-09  Nathan Sidwell  <nathan@acm.org>

        * name-lookup.c (lookup_qualified_name): Expose an overload of a
        singleton with known type.
        (lookup_name_1): Just check the overload's type to expose it.
        * parser.c (cp_parser_lookup_name): Do not do that check here.

2020-11-08  Iain Sandoe  <iain@sandoe.co.uk>

        * parser.c (cp_parser_objc_at_property_declaration): Handle
        class keywords in @property attribute context.

2020-11-06  Marek Polacek  <polacek@redhat.com>

        PR c++/81660
        * except.c (can_convert_eh): Change the return type to bool.  If
        the type TO and FROM are the same, return true.

2020-11-06  Iain Sandoe  <iain@sandoe.co.uk>

        * parser.c (cp_parser_objc_at_property_declaration):
        Improve parsing fidelity. Associate better location info
        with @property attributes.  Clean up the interface to
        objc_add_property_declaration ().

2020-11-06  Jakub Jelinek  <jakub@redhat.com>

        PR c++/67453
        * decl.c (duplicate_decls): Propagate DECL_ATTRIBUTES and
        DECL_PRESERVE_P from olddecl to its clones if any.

2020-11-06  Nathan Sidwell  <nathan@acm.org>

        * cp-tree.h (DECL_UNDECLARED_BUILTIN_P): Delete.
        * cp-objcp-common.c (names_bultin_p): Rename
        DECL_IS_BUILTIN->DECL_IS_UNDECLARED_BUILTIN.
        * decl.c (decls_match): Likewise.  Replace
        DECL_UNDECLARED_BUILTIN_P with DECL_IS_UNDECLARED_BUILTIN.
        (duplicate_decls): Likewise.
        * decl2.c (collect_source_refs): Likewise.
        * name-lookup.c (anticipated_builtin_p, print_binding_level)
        (do_nonmember_using_decl): Likewise.
        * pt.c (builtin_pack_fn_p): Likewise.
        * typeck.c (error_args_num): Likewise.

2020-11-06  Nathan Sidwell  <nathan@acm.org>

        * parser.c (cp_parser_template_declaration): Adjust 'export' warning.
        (cp_parser_explicit_specialization): Remove unneeded bool setting.

2020-11-06  Jan Hubicka  <jh@suse.cz>

        * tree.c (cp_fix_function_decl_p): Do not access ipa_ref_list dirrectly.

2020-11-06  Tobias Burnus  <tobias@codesourcery.com>

        * parser.c (cp_parser_omp_atomic): Add openacc parameter and update
        OpenACC matching.
        (cp_parser_omp_construct): Update call.

2020-11-05  Marek Polacek  <polacek@redhat.com>

        * except.c (check_handlers_1): Add auto_diagnostic_group.

2020-11-05  Marek Polacek  <polacek@redhat.com>

        PR c++/78209
        * pt.c (do_auto_deduction): If init is REFERENCE_REF_P, use its
        first operand.

2020-11-05  Marek Polacek  <polacek@redhat.com>

        PR c++/97675
        * except.c (check_handlers_1): Use OPT_Wexceptions for the
        warning.  Use inform for the second part of the warning.

2020-11-05  Marek Polacek  <polacek@redhat.com>

        PR c++/25814
        * cp-tree.h (enum cp_tree_index): Add CPTI_EXPLICIT_VOID_LIST.
        (explicit_void_list_node): Define.
        (PARENTHESIZED_LIST_P): New macro.
        (struct cp_declarator): Add function::parens_loc.
        * decl.c (cxx_init_decl_processing): Initialize explicit_void_list_node.
        (grokparms): Also break when explicit_void_list_node.
        * parser.c (make_call_declarator): New location_t parameter.  Use it
        to set declarator->u.function.parens_loc.
        (cp_parser_lambda_declarator_opt): Pass UNKNOWN_LOCATION to
        make_call_declarator.
        (warn_about_ambiguous_parse): New function.
        (cp_parser_init_declarator): Call warn_about_ambiguous_parse.
        (cp_parser_declarator): Set *parenthesized_p to false rather than to
        true.
        (cp_parser_direct_declarator): Create a location for the function's
        parentheses and pass it to make_call_declarator.
        (cp_parser_parameter_declaration_clause): Return explicit_void_list_node
        for (void).
        (cp_parser_parameter_declaration_list): Set PARENTHESIZED_LIST_P
        in the parameters tree.

2020-11-04  Jakub Jelinek  <jakub@redhat.com>

        PR c++/97670
        * semantics.c (finish_omp_clauses): Look through array reductions to
        find underlying decl to clear in the aligned_head bitmap.  Use
        DECL_UID (t) instead of DECL_UID (OMP_CLAUSE_DECL (c)) when clearing
        in the bitmap.  Only diagnose errors about allocate vars not being
        privatized on the same construct on allocate clause if it has
        a DECL_P OMP_CLAUSE_DECL.

2020-11-04  Iain Sandoe  <iain@sandoe.co.uk>

        * constexpr.c (potential_constant_expression_1): Handle
        expressions known to be non-constant for Objective-C.

2020-11-03  Jason Merrill  <jason@redhat.com>

        * tree.c (is_byte_access_type): Don't use char_type_p.

2020-11-03  Jakub Jelinek  <jakub@redhat.com>

        PR c++/97663
        * parser.c (cp_parser_init_declarator): Don't try to parse
        C++17 deduction guides if there are any type specifiers even when
        type is NULL.

2020-11-03  Kamlesh Kumar  <kamleshbhalui@gmail.com>
            Jason Merrill  <jason@redhat.com>

        PR c++/97453
        DR2303
        * pt.c (get_template_base): Consider closest base in template
        deduction when base of base also matches.

2020-11-03  Nathan Sidwell  <nathan@acm.org>

        * pt.c (tsubst_expr): Simplify using decl instantiation, add
        asserts.

2020-11-03  Nathan Sidwell  <nathan@acm.org>

        * class.c (copy_fndecl_with_name):  Always not top level.
        (build_cdtor_clones): Add update_methods parm, use it to
        conditionally update the method vec.  Return void
        (clone_cdtor): Adjust.
        (clone_constructors_and_destructors): Adjust comment.

2020-11-03  Nathan Sidwell  <nathan@acm.org>

        * pt.c (primary_template_specialization_p): Use
        VAR_OR_FUNCTION_DECL_P.
        (tsubst_template_decl): Check for FUNCTION_DECL, not !TYPE && !VAR
        for registering a specialization.

2020-11-03  Nathan Sidwell  <nathan@acm.org>

        * cp-tree.h (fixup_deferred_exception_variants): Declare.
        * parser.c (cp_parser_class_specifier_1): Call it when
        completing deferred parses rather than creating a variant.
        (cp_parser_member_declaration): Move comment from ...
        (cp_parser_noexcept_specification_opt): ... here.  Refactor the
        deferred parse.
        * tree.c (fixup_deferred_exception_variants): New.

2020-11-03  Nathan Sidwell  <nathan@acm.org>

        * pt.c (tsubst_lambda_expr): Reorder extra-scope handling to match
        the non-template case.
        (instantiate_body): Move a couple of declarations to their
        initializers.

2020-11-03  Nathan Sidwell  <nathan@acm.org>

        * decl.c (duplicate_decls): Return error_mark_node fo extern-c
        mismatch.

2020-11-03  Marek Polacek  <polacek@redhat.com>

        * constexpr.c (potential_constant_expression_1): Treat
        __PRETTY_FUNCTION__ inside a template function as
        potentially-constant.
        * pt.c (uses_template_parms): Call
        instantiation_dependent_expression_p instead of
        value_dependent_expression_p.
        (instantiation_dependent_expression_p): Check
        potential_constant_expression before calling
        value_dependent_expression_p.

2020-11-03  Marek Polacek  <polacek@redhat.com>

        PR c++/97632
        * init.c (build_new_1): Disable -Winit-list-lifetime for an unevaluated
        operand.

2020-11-03  Nathan Sidwell  <nathan@acm.org>

        * tree.c (bind_template_template_parm): Mark the parm as a
        template parm.
        (cp_tree_equal): Refactor CALL_EXPR.  Use comp_template_args for
        TREE_VECs.

2020-11-03  Nathan Sidwell  <nathan@acm.org>

        * rtti.c (init_rtti_processing): Move var decl to its init.
        (get_tinfo_decl): Likewise.  Break out creation to called helper
        ...
        (get_tinfo_decl_direct): ... here.
        (build_dynamic_cast_1): Move var decls to their initializers.
        (tinfo_base_init): Set decl's location to BUILTINS_LOCATION.
        (get_tinfo_desc): Only push ABI namespace when needed.  Set type's
        context.

2020-11-02  Nathan Sidwell  <nathan@acm.org>

        * decl.c (start_decl_1): Refactor declarations.  Fixup some
        whitespace.
        (lookup_and_check_tag): Fixup some whitespace.

2020-11-02  Nathan Sidwell  <nathan@acm.org>

        * decl.c (duplicate_decls): Refactor some template & builtin
        handling.

2020-11-02  Nathan Sidwell  <nathan@acm.org>

        * cp-tree.h (struct cxx_int_tree_map): Delete.
        (struct cxx_int_tree_map_hasher): Delete.
        * cp-gimplify.c (cxx_int_tree_map_hasher::equal): Delete.
        (cxx_int_tree_map_hasher::hash): Delete.

2020-11-02  Patrick Palka  <ppalka@redhat.com>

        * class.c (finish_struct_1): Don't call clear_satisfaction_cache.
        * constexpr.c (clear_cv_and_fold_caches): Likewise.  Remove bool
        parameter.
        * constraint.cc (clear_satisfaction_cache): Remove definition.
        * cp-tree.h (clear_satisfaction_cache): Remove declaration.
        (clear_cv_and_fold_caches): Remove bool parameter.
        * typeck2.c (store_init_value): Remove argument to
        clear_cv_and_fold_caches.

2020-11-01  Iain Sandoe  <iain@sandoe.co.uk>

        * parser.c (cp_parser_objc_at_property_declaration): Use any
        exisiting syntax error to suppress complaints about a missing
        closing parenthesis in parsing property attributes.

2020-10-30  Jakub Jelinek  <jakub@redhat.com>

        * semantics.c (finish_omp_clauses) <case OMP_CLAUSE_ALLOCATE>: Handle
        non-static members in methods.
        * pt.c (tsubst_omp_clauses): Handle OMP_CLAUSE_ALLOCATE.

2020-10-29  Marek Polacek  <polacek@redhat.com>

        DR 625
        PR c++/97479
        * parser.c (cp_parser_type_id_1): Reject using auto as
        a template-argument in C++20.

2020-10-29  Marek Polacek  <polacek@redhat.com>

        PR c++/93107
        * pt.c (do_auto_deduction): Call resolve_nondeduced_context for
        the elements of a { } list.

2020-10-29  Marek Polacek  <polacek@redhat.com>

        * typeck.c (do_warn_enum_conversions): Don't warn for SPACESHIP_EXPR.
        (cp_build_binary_op): Reject float <=> enum or enum <=> float.  Use
        CP_INTEGRAL_TYPE_P instead of INTEGRAL_OR_ENUMERATION_TYPE_P.

2020-10-29  Patrick Palka  <ppalka@redhat.com>

        * constraint.cc (get_normalized_constraints): Remove 'args'
        parameter.  Pass NULL_TREE as the initial template arguments to
        normalize_expression.
        (get_normalized_constraints_from_info): Remove 'args' parameter
        and adjust the call to get_normalized_constraints.
        (get_normalized_constraints_from_decl): Remove 'args' local
        variable and adjust call to get_normalized_constraints_from_info.
        (normalize_concept_definition): Remove 'args' local variable
        and adjust call to get_normalized_constraints.
        (normalize_constraint_expression): Remove the two-parameter
        overload.  Remove 'args' parameter from the three-parameter
        overload and update function comment accordingly.  Remove
        default argument from 'diag' parameter.  Adjust call to
        get_normalized_constraints.
        (finish_nested_requirement): Adjust call to
        normalize_constraint_expression.
        (strictly_subsumes): Remove 'args' parameter.  Adjust call to
        get_normalized_constraints_from_info.
        (weakly_subsumes): Likewise.
        * cp-tree.h (strictly_subsumes): Remove 'args' parameter.
        (weakly_subsumes): Likewise.
        * pt.c (process_partial_specialization): Adjust call to
        strictly_subsumes.
        (is_compatible_template_arg): Adjust call to weakly_subsumes.

2020-10-29  Patrick Palka  <ppalka@redhat.com>

        PR c++/97412
        * constraint.cc (normalize_concept_check): Don't call
        tsubst_template_args when 'args' is NULL.

2020-10-29  Jason Merrill  <jason@redhat.com>

        PR c++/97388
        * constexpr.c (cxx_eval_outermost_constant_expr): Revert to
        original expression if evaluation sets non_constant_p.

2020-10-29  Jakub Jelinek  <jakub@redhat.com>
            Jason Merrill  <jason@redhat.com>

        PR c++/97388
        * constexpr.c (cxx_bind_parameters_in_call): Set non_constant_args
        if the parameter type has a non-trivial destructor.
        (cxx_eval_call_expression): Only unshare arguments if we're
        memoizing this evaluation.

2020-10-29  Jakub Jelinek  <jakub@redhat.com>

        PR c++/95808
        * cp-tree.h (enum cp_tree_index): Add CPTI_HEAP_VEC_UNINIT_IDENTIFIER
        and CPTI_HEAP_VEC_IDENTIFIER.
        (heap_vec_uninit_identifier, heap_vec_identifier): Define.
        * decl.c (initialize_predefined_identifiers): Initialize those
        identifiers.
        * constexpr.c (cxx_eval_call_expression): Reject array allocations
        deallocated with non-array deallocation or non-array allocations
        deallocated with array deallocation.
        (non_const_var_error): Handle heap_vec_uninit_identifier and
        heap_vec_identifier too.
        (cxx_eval_constant_expression): Handle also heap_vec_uninit_identifier
        and in that case during initialization replace it with
        heap_vec_identifier.
        (find_heap_var_refs): Handle heap_vec_uninit_identifier and
        heap_vec_identifier too.

2020-10-29  Nathan Sidwell  <nathan@acm.org>

        * pt.c (push_template_decl): Do not give function-scope entities
        other than implicit typedefs a template header. Do not readd
        template info to a redeclared template.

2020-10-28  Marek Polacek  <polacek@redhat.com>

        * decl.c (grokdeclarator): Offer a fix-it hint for the "unnecessary
        parentheses in declaration" warning.
        * parser.c (cp_parser_direct_declarator): When setting
        declarator->parenthesized, use a location range.

2020-10-28  Marek Polacek  <polacek@redhat.com>

        PR c++/97573
        * call.c (build_conditional_expr_1): Warn about the deprecated
        enum/real type conversion in C++20.  Also warn about a non-enumerated
        and enumerated type in ?: when -Wenum-conversion is on.
        * typeck.c (do_warn_enum_conversions): New function.
        (cp_build_binary_op): Call it.

2020-10-28  Marek Polacek  <polacek@redhat.com>

        PR c++/96675
        PR c++/96742
        * pt.c (tsubst_copy_and_build): Call value_dependent_expression_p or
        type_dependent_expression_p instead of type_dependent_expression_p_push.
        But only call value_dependent_expression_p for expressions that are
        potential_constant_expression.

2020-10-28  Marek Polacek  <polacek@redhat.com>

        PR c++/94799
        * parser.c (cp_parser_class_name): Use parser->scope when
        setting typename_p.

2020-10-28  Marek Polacek  <polacek@redhat.com>

        PR c++/86773
        * parser.c (cp_parser_fold_expression): Return error_mark_node
        if a left fold is preceded by an expression.

2020-10-28  Nathan Sidwell  <nathan@acm.org>

        * parser.c (cp_parser_omp_declare_reduction): Set
        DECL_LOCAL_DECL_P before push_template_decl.
        * pt.c (instantiate_body): Nested fns do not have template_info.

2020-10-28  Patrick Palka  <ppalka@redhat.com>

        PR c++/95132
        * decl2.c (mark_used): Move up the constraints_satisfied_p check
        so that we check constraints before calling maybe_instantiate_decl.

2020-10-28  Nathan Sidwell  <nathan@acm.org>

        * pt.c (push_template_decl): Refactor for some RAII.

2020-10-28  Jakub Jelinek  <jakub@redhat.com>

        * parser.c (cp_parser_omp_clause_name): Handle allocate.
        (cp_parser_omp_clause_allocate): New function.
        (cp_parser_omp_all_clauses): Handle PRAGMA_OMP_CLAUSE_ALLOCATE.
        (OMP_FOR_CLAUSE_MASK, OMP_SECTIONS_CLAUSE_MASK,
        OMP_PARALLEL_CLAUSE_MASK, OMP_SINGLE_CLAUSE_MASK,
        OMP_TASK_CLAUSE_MASK, OMP_TASKGROUP_CLAUSE_MASK,
        OMP_DISTRIBUTE_CLAUSE_MASK, OMP_TEAMS_CLAUSE_MASK,
        OMP_TARGET_CLAUSE_MASK, OMP_TASKLOOP_CLAUSE_MASK): Add
        PRAGMA_OMP_CLAUSE_ALLOCATE.
        * semantics.c (finish_omp_clauses): Handle OMP_CLAUSE_ALLOCATE.
        * pt.c (tsubst_omp_clauses): Likewise.

2020-10-27  Nathan Sidwell  <nathan@acm.org>

        * cp-tree.h (struct lang_type): Delete nested_udts field.
        (CLASSTYPE_NESTED_UTDS): Delete.
        * name-lookup.h (binding_table, binding_entry): Delete typedefs.
        (bt_foreach_proc): Likewise.
        (struct binding_entry_s): Delete.
        (SCOPE_DEFAULT_HT_SIZE, CLASS_SCOPE_HT_SIZE)
        (NAMESPACE_ORDINARY_HT_SIZE, NAMESPACE_STD_HT_SIZE)
        (GLOBAL_SCOPE_HT_SIZE): Delete.
        (binding_table_foreach, binding_table_find): Delete declarations.
        * name-lookup.c (ENTRY_INDEX): Delete.
        (free_binding_entry): Delete.
        (binding_entry_make, binding_entry_free): Delete.
        (struct binding_table_s): Delete.
        (binding_table_construct, binding_table_free): Delete.
        (binding_table_new, binding_table_expand): Delete.
        (binding_table_insert, binding_table_find): Delete.
        (binding_table_foreach): Delete.
        (maybe_process_template_type_declaration): Delete
        CLASSTYPE_NESTED_UTDS insertion.
        (do_pushtag): Likewise.
        * decl2.c (bt_reset_linkage_1): Fold into reset_type_linkage_1.
        (reset_type_linkage_2, bt_reset_linkage_2): Fold into
        reset_type_linkage.
        * pt.c (instantiate_class_template_1): Delete NESTED_UTDs comment.
        (bt_instantiate_type_proc): Delete.
        (do_type_instantiation): Instantiate implicit typedef fields.
        Delete NESTED_UTD walk.
        * search.c (lookup_field_r): Delete unreachable NESTED_UTD
        search.

2020-10-27  Nathan Sidwell  <nathan@acm.org>

        * parser.c (cp_parser_explicit_instantiation): Refactor some RAII.
        * pt.c (bt_instantiate_type_proc): DATA is the tree, pass type to
        do_type_instantiation.
        (do_type_instantiation): Require T to be a type.  Refactor for
        some RAII.

2020-10-26  Ville Voutilainen  <ville.voutilainen@gmail.com>

        * cp-tree.h (CPTK_IS_NOTHROW_ASSIGNABLE): New.
        (CPTK_IS_NOTHROW_CONSTRUCTIBLE): Likewise.
        (is_nothrow_xible): Likewise.
        * method.c (is_nothrow_xible): New.
        (is_trivially_xible): Tweak.
        * parser.c (cp_parser_primary_expression): Handle the new RID_*.
        (cp_parser_trait_expr): Likewise.
        * semantics.c (trait_expr_value): Handle the new RID_*.
        (finish_trait_expr): Likewise.

2020-10-24  Marek Polacek  <polacek@redhat.com>

        PR c++/96241
        * constexpr.c (cxx_eval_array_reference): Set up ctx->ctor if we
        are initializing an aggregate.  Call free_constructor on the new
        CONSTRUCTOR if it isn't returned from cxx_eval_constant_expression.

2020-10-23  Marek Polacek  <polacek@redhat.com>

        PR c++/91741
        * typeck.c (cp_build_binary_op): Implement -Wsizeof-array-div.

2020-10-22  Patrick Palka  <ppalka@redhat.com>

        PR c++/97328
        * constexpr.c (init_subob_ctx): Don't punt on RANGE_EXPR
        indexes, instead build a sub-aggregate initialization context
        with no subobject.

2020-10-22  Patrick Palka  <ppalka@redhat.com>

        PR c++/96575
        * constexpr.c (cxx_eval_constant_expression)
        <case EMPTY_CLASS_EXPR>: Lower it to a CONSTRUCTOR.
        (potential_constant_expression_1) <case COMPOUND_EXPR>: Remove
        now-redundant handling of COMPOUND_EXPR with EMPTY_CLASS_EXPR
        second operand.
        <case EMPTY_CLASS_EXPR>: Return true instead of false.

2020-10-22  Patrick Palka  <ppalka@redhat.com>

        PR c++/97511
        * decl.c (duplicate_decls): Return NULL_TREE if
        DECL_TEMPLATE_PARM_P differ.

2020-10-20  Nathan Sidwell  <nathan@acm.org>

        * name-lookup.c (push_local_extern_decl_alias): Reconstextualize
        alias' parm decls.  Drop any default args.

2020-10-19  Iain Sandoe  <iain@sandoe.co.uk>

        PR c++/97438
        * coroutines.cc (struct coroutine_info): Add a field to
        record that we emitted a promise type error.
        (coro_promise_type_found_p): Check for the case that the
        promise type contains both return_void and return_value.
        Emit an error if so, with information about the wrong
        type methods.

2020-10-16  Nathan Sidwell  <nathan@acm.org>

        PR c++/97460
        * pt.c (push_template_decl): Check DECL_LANG_SPECIFIC in friend
        case.

2020-10-16  Nathan Sidwell  <nathan@acm.org>

        PR c++/96258
        * parser.c (cp_parser_declaration): Make token2 point to EOF if
        token1 was EOF.

2020-10-15  Jason Merrill  <jason@redhat.com>

        PR c++/95844
        * decl.c (copy_fn_p): Return false for a function that is neither a
        constructor nor an assignment operator.
        (move_signature_fn_p): Likewise.

2020-10-15  Marek Polacek  <polacek@redhat.com>

        PR c++/97406
        PR c++/85901
        * cxx-pretty-print.c (pp_cxx_type_specifier_seq): Handle OFFSET_TYPE.
        (cxx_pretty_printer::abstract_declarator): Fix the printing of ')'.
        (cxx_pretty_printer::direct_abstract_declarator): Handle OFFSET_TYPE.
        (cxx_pretty_printer::type_id): Likewise.  Print the abstract declarator
        for pointers-to-members.

2020-10-14  Jason Merrill  <jason@redhat.com>

        PR c++/97358
        * pt.c (check_for_bare_parameter_packs): Diagnose use of
        capture pack.

2020-10-14  Nathan Sidwell  <nathan@acm.org>

        * cp-tree.h (struct lang_decl_fn): Adjust context comment.
        (DECL_FRIEND_P): Replace with ...
        (DECL_UNIQUE_FRIEND_P): ... this.  Only for FUNCTION_DECLs.
        (DECL_FRIEND_CONTEXT): Adjust.
        * class.c (add_implicitly_declared_members): Detect friendly
        spaceship from context.
        * constraint.cc (remove_constraints): Use a checking assert.
        (maybe_substitute_reqs_for): Use DECL_UNIQUE_FRIEND_P.
        * decl.c (check_no_redeclaration_friend_default_args):
        DECL_UNIQUE_FRIEND_P is signficant, not hiddenness.
        (duplicate_decls): Adjust DECL_UNIQUE_FRIEND_P clearing.
        (redeclaration_error_message): Use DECL_UNIQUE_FRIEND_P.
        (start_preparsed_function): Correct in-class friend processing.
        Refactor some initializers.
        (grokmethod): Directly check friend decl-spec.
        * decl2.c (grokfield): Check DECL_UNIQUE_FRIEND_P.
        * friend.c (do_friend): Set DECL_UNIQUE_FRIEND_P first, remove
        extraneous conditions.  Don't re set it afterwards.
        * name-lookup.c (lookup_elaborated_type_1): Simplify revealing
        code.
        (do_pushtag): Likewise.
        * pt.c (optimize_specialization_lookup_p): Check
        DECL_UNIQUE_FRIEND_P.
        (push_template_decl): Likewise.  Drop unneeded friend setting.
        (type_dependent_expression_p): Check DECL_UNIQUE_FRIEND_P.

2020-10-14  Nathan Sidwell  <nathan@acm.org>

        * name-lookup.c (push_local_extern_decl_alias): Push into alias's
        namespace and use pushdecl.
        (do_pushdecl_with_scope): Clarify behaviour.

2020-10-12  Martin Sebor  <msebor@redhat.com>

        PR c++/97201
        * error.c (dump_type_suffix): Handle both the C and C++ forms of
        zero-length arrays.

2020-10-12  Martin Sebor  <msebor@redhat.com>

        PR c++/96511
        PR middle-end/96384
        * init.c (warn_placement_new_too_small): Call builtin_objsize instead
        of duplicating what it does.

2020-10-08  Jason Merrill  <jason@redhat.com>

        PR c++/96805
        PR c++/96199
        * pt.c (tsubst_aggr_type): Don't build a TYPENAME_TYPE when
        entering_scope.
        (tsubst_template_decl): Use tsubst_aggr_type.

2020-10-08  Patrick Palka  <ppalka@redhat.com>

        PR c++/97052
        * constraint.cc (build_type_constraint): Temporarily increment
        processing_template_decl before calling build_concept_check.
        * pt.c (make_constrained_placeholder_type): Likewise.

2020-10-08  Patrick Palka  <ppalka@redhat.com>

        PR c++/96229
        * parser.c (cp_parser_class_specifier_1): Move call to
        associate_classtype_constraints from here to ...
        (cp_parser_class_head): ... here.
        * pt.c (is_compatible_template_arg): Correct documentation to
        say "argument is _no_ more constrained than the parameter".

2020-10-07  Marek Polacek  <polacek@redhat.com>

        PR c++/97010
        * pt.c (tsubst_copy_and_build) <case TEMPLATE_ID_EXPR>: Call
        tsubst_copy_and_build explicitly instead of using the RECUR macro.
        Handle a TEMPLATE_ID_EXPR with an IDENTIFIER_NODE as its operand.
        <case CALL_EXPR>: Perform ADL for a TEMPLATE_ID_EXPR with an
        IDENTIFIER_NODE as its operand.

2020-10-07  Patrick Palka  <ppalka@redhat.com>

        PR c++/88115
        PR libstdc++/97273
        * tree.c (cp_tree_equal) <case ALIGNOF_EXPR>: Return false if
        ALIGNOF_EXPR_STD_P differ.

2020-10-07  Nathan Sidwell  <nathan@acm.org>

        * cp-tree.h (struct language_function): Delete extern_decl_map.
        (DECL_LOCAL_DECL_ALIAS): New.
        * name-lookup.h (is_local_extern): Delete.
        * name-lookup.c (set_local_extern_decl_linkage): Replace with ...
        (push_local_extern_decl): ... this new function.
        (do_pushdecl): Call new function after pushing new decl.  Unhide
        hidden non-functions.
        (is_local_extern): Delete.
        * decl.c (layout_var_decl): Do not allow VLA local externs.
        * decl2.c (mark_used): Also mark DECL_LOCAL_DECL_ALIAS. Drop old
        local-extern treatment.
        * parser.c (cp_parser_oacc_declare): Deal with local extern aliases.
        * pt.c (tsubst_expr): Adjust local extern instantiation.
        * cp-gimplify.c (cp_genericize_r): Remap DECL_LOCAL_DECLs.

2020-10-07  Nathan Sidwell  <nathan@acm.org>

        * cp-tree.h (DECL_BUILTIN_P): Rename to ...
        (DECL_UNDECLARED_BUILTIN_P): ... here.
        * decl.c (duplicate_decls): Adjust.
        * name-lookup.c (anticipated_builtin_p): Adjust.
        (do_nonmember_using_decl): Likewise.

2020-10-07  Nathan Sidwell  <nathan@acm.org>

        * tree.c (build_cp_fntype_variant): Clear
        TYPE_DEPENDENT_P_VALID if necessary.

2020-10-06  Marek Polacek  <polacek@redhat.com>

        PR c++/97297
        * parser.c (cp_parser_direct_declarator): When checking if a
        name is a function template declaration for the P0634R3 case,
        look in uninstantiated templates too.

2020-10-05  Marek Polacek  <polacek@redhat.com>

        * cp-tree.h (NON_UNION_CLASS_TYPE_P): Fix typo in a comment.

2020-10-05  Richard Biener  <rguenther@suse.de>
            Jakub Jelinek  <jakub@redhat.com>

        PR c++/97197
        * error.c (dump_expr): Handle TARGET_MEM_REF.

2020-10-05  Nathan Sidwell  <nathan@acm.org>

        * name-lookup.c (maybe_add_fuzzy_decl): New.
        (maybe_add_fuzzy_binding): New.
        (consider_binding_level): Use intermediate sortable vector for
        namespace bindings.

2020-10-02  Marek Polacek  <polacek@redhat.com>

        PR c++/97014
        * cxx-pretty-print.c (pp_cxx_template_argument_list): If the
        argument is template_parm_object_p, print its DECL_INITIAL.

2020-10-02  Nathan Sidwell  <nathan@acm.org>

        * cp-tree.h (lang_decl_base): anticipated_p is not used for
        anticipatedness.
        (DECL_ANTICIPATED): Delete.
        * decl.c (duplicate_decls): Delete DECL_ANTICIPATED_management,
        use was_hidden.
        (cxx_builtin_function): Drop DECL_ANTICIPATED setting.
        (xref_tag_1): Drop DECL_ANTICIPATED assert.
        * name-lookup.c (name_lookup::adl_class_only): Drop
        DECL_ANTICIPATED check.
        (name_lookup::search_adl): Always dedup.
        (anticipated_builtin_p): Reimplement.
        (do_pushdecl): Drop DECL_ANTICIPATED asserts & update.
        (lookup_elaborated_type_1): Drop DECL_ANTICIPATED update.
        (do_pushtag): Drop DECL_ANTICIPATED setting.
        * pt.c (push_template_decl): Likewise.
        (tsubst_friend_class): Likewise.

2020-10-02  Nathan Sidwell  <nathan@acm.org>

        * name-lookup.c (consider_decl): New, broken out of ...
        (consider_binding_level): ... here.  Iterate the hash table for
        namespace bindings.

2020-10-02  Nathan Sidwell  <nathan@acm.org>

        * cp-tree.h (base_ctor_omit_inherited_parms): Declare.
        * class.c (add_method): Refactor main loop, only pass fns to
        ctor_omit_inherited_parms.
        (build_cdtor_clones): Rename bool parms.
        (clone_cdtor): Call base_ctor_omit_inherited_parms.
        * method.c (base_ctor_omit_inherited_parms): New, broken out of
        ...
        (ctor_omit_inherited_parms): ... here, call it with
        DECL_CLONED_FUNCTION.

2020-10-02  Nathan Sidwell  <nathan@acm.org>

        * cp-tree.h (cp_fname_init): Delete declaration.
        * decl.c (cp_fname_init): Merge into only caller ...
        (cp_make_fname): ... here & refactor.

2020-10-02  Jason Merril  <jason@redhat.com>

        * call.c (build_operator_new_call): Set CALL_FROM_NEW_OR_DELETE_P.
        (build_op_delete_call): Likewise.
        * init.c (build_new_1, build_vec_delete_1, build_delete): Not here.
        (build_delete):

2020-10-02  Jason Merril  <jason@redhat.com>

        * lambda.c (call_from_lambda_thunk_p): New.
        * cp-gimplify.c (cp_genericize_r): Use it.
        * pt.c (tsubst_copy_and_build): Use it.
        * typeck.c (check_return_expr): Use it.
        * cp-tree.h: Declare it.
        (CALL_FROM_NEW_OR_DELETE_P): Move to gcc/tree.h.

2020-10-01  Nathan Sidwell  <nathan@acm.org>

        * cp-tree.h (DECL_ANTICIPATED): Adjust comment.
        (DECL_HIDDEN_P, TYPE_HIDDEN_P): Delete.
        * tree.c (ovl_insert): Delete DECL_HIDDEN_P assert.
        (ovl_skip_hidden): Likewise.

2020-10-01  Nathan Sidwell  <nathan@acm.org>

        * name-lookup.c (pushdecl_top_level): Assert incoming context is
        null, add global_namespace context.
        (pushdecl_top_level_and_finish): Likewise.
        * pt.c (get_template_parm_object): Clear decl context before
        pushing.
        * semantics.c (finish_compound_literal): Likewise.

2020-10-01  Nathan Sidwell  <nathan@acm.org>

        * decl.c (lookup_and_check_tag): Refactor.

2020-10-01  Jakub Jelinek  <jakub@redhat.com>

        PR c++/96994
        * call.c (build_over_call): If obj_arg is non-NULL, return INIT_EXPR
        setting obj_arg to call.

2020-10-01  Jakub Jelinek  <jakub@redhat.com>

        PR c++/97195
        * constexpr.c (cxx_eval_call_expression): Don't VERIFY_CONSTANT the
        second argument.

2020-10-01  Marek Polacek  <polacek@redhat.com>

        PR c++/90210
        * pt.c (do_class_deduction): Don't prune explicit deduction guides
        in copy-list-initialization.  In copy-list-initialization, if an
        explicit deduction guide was selected, give an error.

2020-09-30  Nathan Sidwell  <nathan@acm.org>

        * cp-tree.h (struct lang_decl_fn): Remove hidden_friend_p.
        (DECL_HIDDEN_FRIEND_P): Delete.
        * call.c (add_function_candidate): Drop assert about anticipated
        decl.
        (build_new_op_1): Drop koenig lookup flagging for hidden friend.
        * decl.c (duplicate_decls): Drop HIDDEN_FRIEND_P updating.
        * name-lookup.c (do_pushdecl): Likewise.
        (set_decl_namespace): Discover hiddenness from OVL_HIDDEN_P.
        * pt.c (check_explicit_specialization): Record found_hidden
        explicitly.

2020-09-29  Marek Polacek  <polacek@redhat.com>

        PR c++/94695
        * call.c (ref_conv_binds_directly_p): New function.
        * cp-tree.h (ref_conv_binds_directly_p): Declare.
        * parser.c (warn_for_range_copy): New function.
        (cp_convert_range_for): Call it.

2020-09-29  Nathan Sidwell  <nathan@acm.org>

        * cp-tree.h (ovl_insert): Change final parm to hidden-or-using
        indicator.
        * name-lookup.h (HIDDEN_TYPE_BINDING_P): New.
        (struct cxx_binding): Add type_is_hidden flag.
        * tree.c (ovl_insert): Change using_p parm to using_or_hidden,
        adjust.
        (ovl_skip_hidden): Assert we never see a naked hidden decl.
        * decl.c (xref_tag_1): Delete unhiding friend from here (moved to
        lookup_elaborated_type_1).
        * name-lookup.c (STAT_TYPE_HIDDEN_P, STAT_DECL_HIDDEN_P): New.
        (name_lookup::search_namespace_only): Check new hidden markers.
        (cxx_binding_make): Clear HIDDEN_TYPE_BINDING_P.
        (update_binding): Update new hidden markers.
        (lookup_name_1): Check HIDDEN_TYPE_BINDING_P and simplify friend
        ignoring.
        (lookup_elaborated_type_1): Use new hidden markers.  Reveal the
        decl here.

2020-09-29  Nathan Sidwell  <nathan@acm.org>

        * name-lookup.c (create_local_binding): Do not clear
        INHERITED_VALUE_BINDING_P here.
        (name_lookup::process_binding): Move done hidden-decl triage to ...
        (name_lookup::search_namespace_only): ... here, its only caller.
        (cxx_binding_make): Clear flags here.
        (push_binding): Not here.
        (pop_local_binding): RAII.
        (update_binding): Refactor.
        (do_pushdecl): Assert we're never revealing a local binding.
        (do_pushdecl_with_scope): Directly call do_pushdecl.
        (get_class_binding): Do not clear LOCAL_BINDING_P here.
        * pt.c (push_template_decl): Set friend & anticipated before
        pushing.

2020-09-29  Nathan Sidwell  <nathan@acm.org>

        * name-lookup.c (update_binding): We never meet two implicit
        typedefs.
        (do_pushdecl): Adjust set_identifier_type_value_with_scope calls.
        (set_identifier_type_value_with_scope): Do not update binding in
        the namespace-case.  Assert it is already there.

2020-09-25  Nathan Sidwell  <nathan@acm.org>

        * cp-tree.h (duplicate_decls): Replace 'is_friend' with 'hiding'
        and add 'was_hidden'.
        * name-lookup.h (pushdecl_namespace_level): Replace 'is_friend'
        with 'hiding'.
        (pushdecl): Likewise.
        (pushdecl_top_level): Drop is_friend parm.
        * decl.c (check_no_redeclaration_friend_default_args): Rename parm
        olddelc_hidden_p.
        (duplicate_decls): Replace 'is_friend' with 'hiding'
        and 'was_hidden'.  Do minimal adjustments in body.
        (cxx_builtin_function): Pass 'hiding' to pushdecl.
        * friend.c (do_friend): Pass 'hiding' to pushdecl.
        * name-lookup.c (supplement_binding_1): Drop defaulted arg to
        duplicate_decls.
        (update_binding): Replace 'is_friend' with 'hiding'.  Drop
        defaulted arg to duplicate_decls.
        (do_pushdecl): Replace 'is_friend' with 'hiding'.  Assert no
        surprise hidhing.  Adjust duplicate_decls calls to inform of old
        decl's hiddennes.
        (pushdecl): Replace 'is_friend' with 'hiding'.
        (set_identifier_type_value_with_scope): Adjust update_binding
        call.
        (do_pushdecl_with_scope): Replace 'is_friend' with 'hiding'.
        (pushdecl_outermost_localscope): Drop default arg to
        do_pushdecl_with_scope.
        (pushdecl_namespace_level): Replace 'is_friend' with 'hiding'.
        (pushdecl_top_level): Drop is_friend parm.
        * pt.c (register_specialization): Comment duplicate_decls call
        args.
        (push_template_decl): Commont pushdecl_namespace_level.
        (tsubst_friend_function, tsubst_friend_class): Likewise.

2020-09-25  Nathan Sidwell  <nathan@acm.org>

        * name-lookup.h (enum tag_scope): Replace with ...
        (enum class TAG_how): ... this.  Add HIDDEN_FRIEND value.
        (lookup_type_scope): Replace with ...
        (lookup_elaborated_type): ... this.
        (pushtag): Use TAG_how, not tag_scope.
        * cp-tree.h (xref_tag): Parameter is TAG_how, not tag_scope.
        * decl.c (lookup_and_check_tag): Likewise.  Adjust.
        (xref_tag_1, xref_tag): Likewise. adjust.
        (start_enum): Adjust lookup_and_check_tag call.
        * name-lookup.c (lookup_type_scope_1): Rename to ...
        (lookup_elaborated_type_1) ... here. Use TAG_how, not tag_scope.
        (lookup_type_scope): Rename to ...
        (lookup_elaborated_type): ... here.  Use TAG_how, not tag_scope.
        (do_pushtag): Use TAG_how, not tag_scope.  Adjust.
        (pushtag): Likewise.
        * parser.c (cp_parser_elaborated_type_specifier): Adjust.
        (cp_parser_class_head): Likewise.

2020-09-25  Nathan Sidwell  <nathan@acm.org>

        * cp-tree.h (DECL_BUILTIN_P): New.
        * decl.c (duplicate_decls): Use it.  Do not treat omp-udr as a
        builtin.
        * name-lookup.c (anticipated_builtin): Use it.
        (set_decl_context_in_fn): Function-scope OMP UDRs have function context.
        (do_nonmember_using_decl): Use DECL_BUILTIN_P.
        * parser.c (cp_parser_omp_declare_reduction): Function-scope OMP
        UDRs have function context.  Assert we never find a valid duplicate.
        * pt.c (tsubst_expr): Function-scope OMP UDRs have function context.

2020-09-24  Nathan Sidwell  <nathan@acm.org>

        * cp-tree.h (duplicate_decls): Default is_friend to false.
        (xref_tag): Default tag_scope & tpl_header_p to ts_current & false.
        (push_template_decl_real): Default is_friend to false.  Rename to
        ...
        (push_template_decl): ... here.  Delete original decl.
        * name-lookup.h (pushdecl_namespace_level): Default is_friend to
        false.
        (pushtag): Default tag_scope to ts_current.
        * coroutines.cc (morph_fn_to_coro): Drop default args to xref_tag.
        * decl.c (start_decl): Drop default args to duplicate_decls.
        (start_enum): Drop default arg to pushtag & xref_tag.
        (start_preparsed_function): Pass DECL_FRIEND_P to
        push_template_decl.
        (grokmethod): Likewise.
        * friend.c (do_friend): Rename push_template_decl_real calls.
        * lambda.c (begin_lamnbda_type): Drop default args to xref_tag.
        (vla_capture_type): Likewise.
        * name-lookup.c (maybe_process_template_type_declaration): Rename
        push_template_decl_real call.
        (pushdecl_top_level_and_finish): Drop default arg to
        pushdecl_namespace_level.
        * pt.c (push_template_decl_real): Assert no surprising friend
        functions.  Rename to ...
        (push_template_decl): ... here.  Delete original function.
        (lookup_template_class_1): Drop default args from pushtag.
        (instantiate_class_template_1): Likewise.
        * ptree.c (debug_overload): Print hidden and using markers.
        * rtti.c (init_rtti_processing): Drop refault args from xref_tag.
        (build_dynamic_cast_1, tinfo_base_init): Likewise.
        * semantics.c (begin_class_definition): Drop default args to
        pushtag.

2020-09-24  Nathan Sidwell  <nathan@acm.org>

        PR c++/97186
        * pt.c (maybe_instantiate_noexcept): Local externs are never
        member fns.

2020-09-23  Nathan Sidwell  <nathan@acm.org>

        * name-lookup.h (typedef cxx_binding): Delete tdef.
        (typedef cp_binding_level): Likewise.
        (struct cxx_binding): Flags are bools.

2020-09-23  Nathan Sidwell  <nathan@acm.org>

        PR c++/97171
        * pt.c (tsubst_copy) [FUNCTION_DECL,VAR_DECL]: Retrieve local
        specialization for DECL_LOCAL_P decls.

2020-09-22  Patrick Palka  <ppalka@redhat.com>

        PR c++/95310
        * pt.c (corresponding_template_parameter): Define.
        (keep_template_parm): Use it to adjust the given template
        parameter to the corresponding in-scope one from ctx_parms.

2020-09-22  Nathan Sidwell  <nathan@acm.org>

        * cp-tree.h (xref_tag_from_type): Don't declare.
        * decl.c (xref_tag_from_type): Delete.
        * pt.c (lookup_template_class_1): Erroneously located class
        definitions just give error_mark, don't try and inject it into the
        namespace.

2020-09-22  Jakub Jelinek  <jakub@redhat.com>

        PR c++/97145
        * constexpr.c (cxx_eval_builtin_function_call): Return void_node for
        calls to __sanitize_ptr_{sub,cmp} builtins.

2020-09-22  Nathan Sidwell  <nathan@acm.org>

        * pt.c (instantiate_class_template_1): Do not repush and unhide
        injected friend.

2020-09-21  Marek Polacek  <polacek@redhat.com>

        PR c++/90583
        DR 1722
        * lambda.c (maybe_add_lambda_conv_op): Mark the conversion function
        as noexcept.

2020-09-21  Marek Polacek  <polacek@redhat.com>

        * pt.c (deduction_guides_for): Add a bool parameter.  Set it.
        (do_class_deduction): Warn when CTAD succeeds but the type doesn't
        have any explicit deduction guides.

2020-09-21  Nathan Sidwell  <nathan@acm.org>

        * decl.c (xref_tag_1): Use IDENTIFIER_LAMBDA_P to detect lambdas.
        * lambda.c (begin_lambda_type): Use ts_current to push the tag.
        * name-lookup.h (enum tag_scope): Drop ts_lambda.

2020-09-21  Marek Polacek  <polacek@redhat.com>

        PR c++/97099
        * decl.c (redeclaration_error_message): Detect a redeclaration of
        deduction guides.

2020-09-19  Sandra Loosemore  <sandra@codesourcery.com>

        * cp-gimplify.c (enum bc_t, bc_label): Move to c-family.
        (begin_bc_block, finish_bc_block, get_bc_label): Likewise.
        (genericize_cp_loop): Likewise.
        (genericize_for_stmt, genericize_while_stmt): Likewise.
        (genericize_do_stmt, genericize_switch_stmt): Likewise.
        (genericize_continue_stmt, genericize_break_stmt): Likewise.
        (genericize_omp_for_stmt): Likewise.
        (cp_genericize_r): Call c_genericize_control_stmt instead of
        above functions directly.
        (cp_genericize): Call save_bc_state and restore_bc_state instead
        of manipulating bc_label directly.
        * cp-objcp-common.c (cxx_block_may_fallthru): Defer to
        c_block_may_fallthru instead of handling SWITCH_STMT here.
        (cp_common_init_ts): Move handling of loop and switch-related
        statements to c-family.
        * cp-tree.def (FOR_STMT, WHILE_STMT, DO_STMT): Move to c-family.
        (BREAK_STMT, CONTINUE_STMT, SWITCH_STMT): Likewise.
        * cp-tree.h (LABEL_DECL_BREAK, LABEL_DECL_CONTINUE): Likewise.
        (WHILE_COND, WHILE_BODY): Likewise.
        (DO_COND, DO_BODY): Likewise.
        (FOR_INIT_STMT, FOR_COND, FOR_EXPR, FOR_BODY, FOR_SCOPE): Likewise.
        (SWITCH_STMT_COND, SWITCH_STMT_BODY): Likewise.
        (SWITCH_STMT_TYPE, SWITCH_STMT_SCOPE): Likewise.
        (SWITCH_STMT_ALL_CASES_P, SWITCH_STMT_NO_BREAK_P): Likewise.
        * cxx-pretty-print.c (cxx_pretty_printer::statement): Move code
        to handle structured loop and switch tree nodes to c-family.
        * dump.c (cp_dump_tree): Likewise.

2020-09-19  Patrick Palka  <ppalka@redhat.com>

        PR c++/96531
        PR c++/97103
        * constraint.cc (map_arguments): Call template_parm_to_arg
        in the self-mapping case.
        (finish_shorthand_constraint): No need to build a TREE_LIST
        before calling template_parm_to_arg.
        * pt.c (template_parm_to_arg): Rewrite to handle TEMPLATE_PARM_P
        nodes as well as DECL_TEMPLATE_PARM_P nodes, and to make the
        overlying TREE_LIST node optional.
        (keep_template_parm): Don't record a BOUND_TEMPLATE_TEMPLATE_PARM,
        instead record its corresponding TEMPLATE_TEMPLATE_PARM.
        (convert_generic_types_to_packs): Don't call
        template_parm_to_arg.

2020-09-19  Patrick Palka  <ppalka@redhat.com>

        PR c++/97051
        * constraint.cc (satisfy_atom): Pass true as the
        manifestly_const_eval argument to maybe_constant_value.

2020-09-18  Jason Merrill  <jason@redhat.com>

        PR bootstrap/97118
        * decl.c (complete_vars): Only call layout_var_decl if completing
        the type succeeded.

2020-09-18  Jason Merrill  <jason@redhat.com>

        * decl.c (complete_vars): Call layout_var_decl.

2020-09-17  Patrick Palka  <ppalka@redhat.com>

        PR c++/96409
        PR c++/96410
        * constraint.cc (tsubst_requires_expr): Use REQUIRES_EXPR_PARMS
        and REQUIRES_EXPR_REQS.  Use REQUIRES_EXPR_EXTRA_ARGS,
        add_extra_args and build_extra_args to defer substitution until
        we have all the template arguments.
        (finish_requires_expr): Adjust the call to build_min so that
        REQUIRES_EXPR_EXTRA_ARGS gets set to NULL_TREE.
        * cp-tree.def (REQUIRES_EXPR): Give it a third operand.
        * cp-tree.h (REQUIRES_EXPR_PARMS, REQUIRES_EXPR_REQS,
        REQUIRES_EXPR_EXTRA_ARGS): Define.
        (add_extra_args, build_extra_args): Declare.

2020-09-16  Nathan Sidwell  <nathan@acm.org>

        * cp-tree.h (cp_check_omp_declare_reduction): Return bool.
        * semantics.c (cp_check_omp_declare_reduction): Return true on for
        success.
        * pt.c (push_template_decl_real): OMP reductions do not get a
        template header.
        (tsubst_function_decl): Remove special casing for local decl omp
        reductions.
        (tsubst_expr): Call instantiate_body for a local omp reduction.
        (instantiate_body): Add nested_p parm, and deal with such
        instantiations.
        (instantiate_decl): Reject FUNCTION_SCOPE entities, adjust
        instantiate_body call.

2020-09-16  Nathan Sidwell  <nathan@acm.org>

        * pt.c (instantiate_body): Remove 'nested' var, simplify
        push_to_top logic.

2020-09-16  Nathan Sidwell  <nathan@acm.org>

        * pt.c (instantiate_body): New, broken out of ..
        (instantiate_decl): ... here.  Call it.

2020-09-15  Nathan Sidwell  <nathan@acm.org>

        * pt.c (push_template_decl_real): OMP reductions retain a template
        header.
        (tsubst_function_decl): Likewise.

2020-09-15  Tobias Burnus  <tobias@codesourcery.com>

        PR fortran/96668
        * cp-gimplify.c (cxx_omp_finish_clause): Add bool openacc arg.
        * cp-tree.h (cxx_omp_finish_clause): Likewise
        * semantics.c (handle_omp_for_class_iterator): Update call.

2020-09-14  Marek Polacek  <polacek@redhat.com>

        * pt.c (push_template_decl_real): Use VAR_OR_FUNCTION_DECL_P.

2020-09-14  Nathan Sidwell  <nathan@acm.org>

        * pt.c (push_template_decl_real): Don't attach a template head to
        local externs.
        (tsubst_function_decl): Add support for headless local extern
        decls.
        (tsubst_decl): Add support for headless local extern decls.

2020-09-11  Nathan Sidwell  <nathan@acm.org>

        * decl.c (grokfndecl): Don't attach to local extern.

2020-09-11  Nathan Sidwell  <nathan@acm.org>

        * parser.c (cp_parser_objc_method_definition_list): Reimplement
        loop, make sure we pop scope.

2020-09-11  Marek Polacek  <polacek@redhat.com>

        * cp-tree.h (LOOKUP_CONSTINIT): Remove.
        (LOOKUP_REWRITTEN): Adjust.
        * decl.c (duplicate_decls): Set DECL_DECLARED_CONSTINIT_P.
        (check_initializer): Use DECL_DECLARED_CONSTINIT_P instead of
        LOOKUP_CONSTINIT.
        (cp_finish_decl): Don't set DECL_DECLARED_CONSTINIT_P.  Use
        DECL_DECLARED_CONSTINIT_P instead of LOOKUP_CONSTINIT.
        (grokdeclarator): Set DECL_DECLARED_CONSTINIT_P.
        * decl2.c (grokfield): Don't handle LOOKUP_CONSTINIT.
        * parser.c (cp_parser_decomposition_declaration): Remove
        LOOKUP_CONSTINIT handling.
        (cp_parser_init_declarator): Likewise.
        * pt.c (tsubst_expr): Likewise.
        (instantiate_decl): Likewise.
        * typeck2.c (store_init_value): Use DECL_DECLARED_CONSTINIT_P instead
        of LOOKUP_CONSTINIT.

2020-09-10  Nathan Sidwell  <nathan@acm.org>

        * cp-tree.h (TINFO_VAR_DECLARED_CONSTINIT): Replace with ...
        (DECL_DECLARED_CONSTINIT_P): ... this.
        * decl.c (start_decl): No need to retrofit_lang_decl for constinit
        flag.
        (cp_finish_decl): Use DECL_DECLARED_CONSTINIT_P.
        * pt.c (tsubst_decl): No need to handle constinit flag
        propagation.
        (tsubst_expr): Or here.

2020-09-10  Nathan Sidwell  <nathan@acm.org>

        * cp-tree.h (DECL_LOCAL_FUNCTION_P): Rename to ...
        (DECL_LOCAL_DECL_P): ... here.  Accept both fns and vars.
        * decl.c (start_decl): Set DECL_LOCAL_DECL_P for local externs.
        (omp_declare_variant_finalize_one): Use DECL_LOCAL_DECL_P.
        (local_variable_p): Simplify.
        * name-lookup.c (set_decl_context_in_fn): Assert DECL_LOCAL_DECL_P
        is as expected.  Simplify.
        (do_pushdecl): Don't set decl_context_in_fn for friends.
        (is_local_extern): Simplify.
        * call.c (equal_functions): Use DECL_LOCAL_DECL_P.
        * parser.c (cp_parser_postfix_expression): Likewise.
        (cp_parser_omp_declare_reduction): Likewise.
        * pt.c (check_default_tmpl_args): Likewise.
        (tsubst_expr): Assert nested reduction function is local.
        (type_dependent_expression_p): Use DECL_LOCAL_DECL_P.
        * semantics.c (finish_call_expr): Likewise.

2020-09-09  Marek Polacek  <polacek@redhat.com>

        PR c++/77841
        * decl.c (reshape_init): If we're initializing a char array from
        a string-literal that is enclosed in braces, unwrap it.
        * init.c (build_new_1): Don't handle string-initializers here.
        (build_new): Handle new-expression with paren-init when the
        array bound is known.  Always pass string constants to build_new_1
        enclosed in braces.  Don't handle string-initializers in any
        special way.

2020-09-09  Marek Polacek  <polacek@redhat.com>

        PR c++/95164
        * decl.c (reshape_init_r): When initializing an aggregate member
        with an initializer from an initializer-list, also consider
        COMPOUND_LITERAL_P.

2020-09-09  Nathan Sidwell  <nathan@acm.org>

        * parser.c (cp_parser_omp_declare_reduction): Refactor to avoid
        code duplication.  Update DECL_TI_TEMPLATE's context.
        * pt.c (tsubst_expr): For OMP reduction function, set context to
        global_namespace before pushing.
        (tsubst_omp_udr): Assert current_function_decl, add comment about
        decl context.

2020-09-09  Patrick Palka  <ppalka@redhat.com>

        PR c++/96647
        * class.c (resolve_address_of_overloaded_function): Check
        constraints_satisfied_p and perform return-type deduction via
        maybe_instantiate_decl when considering non-template functions
        in the overload set.
        * cp-tree.h (maybe_instantiate_decl): Declare.
        * decl2.c (maybe_instantiate_decl): Remove static.

2020-09-04  Jason Merrill  <jason@redhat.com>

        * expr.c (mark_use): Use iloc_sentinel.

2020-09-03  Jakub Jelinek  <jakub@redhat.com>

        PR c++/96901
        * constexpr.c (fundef_copies_table): Change type from
        hash_map<tree, tree> * to decl_tree_map *.

2020-09-03  Marek Polacek  <polacek@redhat.com>

        PR c++/92812
        * cp-tree.h (do_aggregate_paren_init): Declare.
        * decl.c (do_aggregate_paren_init): New.
        (grok_reference_init): Use it.
        (check_initializer): Likewise.
        * init.c (perform_member_init): Handle initializing an array from
        a ()-list.  Use do_aggregate_paren_init.

2020-09-03  Jakub Jelinek  <jakub@redhat.com>

        PR c++/96862
        * constexpr.c (cxx_eval_outermost_constant_expr): Temporarily disable
        flag_rounding_math during manifestly constant evaluation.

2020-09-01  Marek Polacek  <polacek@redhat.com>

        PR c++/77841
        * init.c (build_new_1): Call reshape_init.

2020-09-01  Jakub Jelinek  <jakub@redhat.com>

        PR c++/96867
        * semantics.c (handle_omp_array_sections_1): Test
        DECL_ARRAY_PARAMETER_P only on PARM_DECLs.

2020-08-31  Marek Polacek  <polacek@redhat.com>
            Jason Merrill  <jason@redhat.com>

        PR c++/93529
        * call.c (build_new_method_call_1): Use build_constructor_from_vec
        instead of build_tree_list_vec + build_constructor_from_list.
        * init.c (build_new_1): Handle new char[]{"foo"}.  Use
        build_constructor_from_vec instead of build_tree_list_vec +
        build_constructor_from_list.
        (build_new): Deduce the array size in new-expression if not
        present.  Handle ()-init.  Handle initializing an array from
        a string literal.
        * parser.c (cp_parser_new_type_id): Leave [] alone.
        (cp_parser_direct_new_declarator): Allow [].
        * pt.c (type_dependent_expression_p): In a NEW_EXPR, consider
        array types whose dimension has to be deduced type-dependent.

2020-08-27  Martin Liska  <mliska@suse.cz>

        * class.c (build_vtbl_initializer): Set exact argument of a vector
        growth function to true.
        * constraint.cc (get_mapped_args): Likewise.
        * decl.c (cp_maybe_mangle_decomp): Likewise.
        (cp_finish_decomp): Likewise.
        * parser.c (cp_parser_omp_for_loop): Likewise.
        * pt.c (canonical_type_parameter): Likewise.
        * rtti.c (get_pseudo_ti_init): Likewise.

2020-08-26  Nathan Sidwell  <nathan@acm.org>

        * decl.c (poplevel): A local-binding tree list holds the name in
        TREE_PURPOSE.
        * name-lookup.c (update_local_overload): Add id to TREE_PURPOSE.
        (lookup_name_1): Deal with local-binding error_mark_node marker.
        (op_unqualified_lookup): Return error_mark_node for 'nothing
        found'.  Retain global binding, check class binding here.
        (maybe_save_operator_binding): Reimplement to always cache a
        result.
        (push_operator_bindings): Deal with 'ignore' marker.

2020-08-25  Tobias Burnus  <tobias@codesourcery.com>

        PR c/96678
        * semantics.c (handle_omp_array_sections_1): Talk about
        array function parameter in the error message.

2020-08-25  Jakub Jelinek  <jakub@redhat.com>

        PR c++/96721
        * cp-tree.h (build_trivial_dtor_call): Add bool argument defaulted
        to false.
        * call.c (build_trivial_dtor_call): Add NO_PTR_DEREF argument.  If
        instance is a pointer and NO_PTR_DEREF is true, clobber the pointer
        rather than what it points to.
        * semantics.c (finish_call_expr): Call build_trivial_dtor_call with
        true as NO_PTR_DEREF.

2020-08-25  Jason Merrill  <jason@redhat.com>

        PR c++/95428
        * optimize.c (populate_clone_array): Revert PR70462 change.
        (maybe_clone_body): Likewise.

2020-08-24  Nathan Sidwell  <nathan@acm.org>

        * ptree.c (debug_overload): New.

2020-08-19  Jason Merrill  <jason@redhat.com>

        DR 2369
        * cp-tree.h (push_tinst_level, push_tinst_level_loc): Declare.
        * constraint.cc (satisfy_declaration_constraints):
        Use add_outermost_template_args and push_tinst_level.
        * pt.c (add_outermost_template_args): Handle getting
        a TEMPLATE_DECL as the first argument.
        (push_tinst_level, push_tinst_level_loc): No longer static.
        (fn_type_unification): Check satisfaction before non-dependent
        conversions.

2020-08-18  Nathan Sidwell  <nathan@acm.org>

        * cp-tree.h (SET_TYPE_TEMPLTE_INFO): Do not deal with ALIAS templates.
        * pt.c (lookup_template_class_1): Special-case alias template
        template_info setting.

2020-08-18  Jason Merrill  <jason@redhat.com>

        PR c++/96199
        * pt.c (tsubst_aggr_type): Rewrite in C++17, too.
        (maybe_dependent_member_ref): Likewise.
        (build_deduction_guide): Re-substitute template parms.
        * cp-tree.h (struct push_nested_class_guard): New.
        * constraint.cc (get_normalized_constraints_from_decl): Use it.

2020-08-18  Jason Merrill  <jason@redhat.com>

        PR c++/96199
        * pt.c (maybe_dependent_member_ref): New.
        (tsubst_copy) [CONST_DECL]: Use it.
        [VAR_DECL]: Likewise.
        (tsubst_aggr_type): Handle nested type.

2020-08-18  Nathan Sidwell  <nathan@acm.org>

        * name-lookup.c (qualify_lookup): Drop lambda checking here.
        Reorder namespace & type checking.
        (lookup_name_1): Do hidden lambda checking here.

2020-08-14  Nathan Sidwell  <nathan@acm.org>

        * name-lookup.h (lookup_name_real, lookup_name_nonclass): Rename
        to ...
        (lookup_name): ... these new overloads.
        * name-lookup.c (identifier_type_value_1): Rename lookup_name_real
        call.
        (lookup_name_real_1): Rename to ...
        (lookup_name_1): ... here.
        (lookup_name_real): Rename to ...
        (lookup_name): ... here.  Rename lookup_name_real_1 call.
        (lookup_name_nonclass): Delete.
        * call.c (build_operator_new_call): Rename lookup_name_real call.
        (add_operator_candidates): Likewise.
        (build_op_delete_call): Rename lookup_name_nonclass call.
        * parser.c (cp_parser_lookup_name): Likewise.
        * pt.c (tsubst_friend_class, lookup_init_capture_pack): Likewise.
        (tsubst_expr): Likewise.
        * semantics.c (capture_decltype): Likewise.

2020-08-14  Nathan Sidwell  <nathan@acm.org>

        * cp-tree.h (LOOKUP_HIDDEN): Delete.
        (LOOKUP_PREFER_RVALUE): Adjust initializer.
        * name-lookup.h (enum class LOOK_want): Add HIDDEN_FRIEND and
        HIDDEN_LAMBDA flags.
        (lookup_name_real): Drop flags parm.
        (lookup_qualified_name): Drop find_hidden parm.
        * name-lookup.c (class name_lookup): Drop hidden field, adjust
        ctors.
        (name_lookup::add_overload): Check want for hiddenness.
        (name_lookup::process_binding): Likewise.
        (name_lookup::search_unqualified): Likewise.
        (identifier_type_value_1): Adjust lookup_name_real call.
        (set_decl_namespace): Adjust name_lookup ctor.
        (qualify_lookup): Drop flags parm, use want for hiddenness.
        (lookup_qualified_name): Drop find_hidden parm.
        (lookup_name_real_1): Drop flags parm, adjust qualify_lookup
        calls.
        (lookup_name_real): Drop flags parm.
        (lookup_name_nonclass, lookup_name): Adjust lookup_name_real
        calls.
        (lookup_type_scope_1): Adjust qualify_lookup calls.
        * call.c (build_operator_new_call): Adjust lookup_name_real call.
        (add_operator_candidates): Likewise.
        * coroutines.cc (morph_fn_to_coro): Adjust lookup_qualified_name
        call.
        * parser.c (cp_parser_lookup_name): Adjust lookup_name_real calls.
        * pt.c (check_explicit_specialization): Adjust
        lookup_qualified_name call.
        (deduction_guides_for): Likewise.
        (tsubst_friend_class): Adjust lookup_name_real call.
        (lookup_init_capture_pack): Likewise.
        (tsubst_expr): Likewise, don't look in namespaces.
        * semantics.c (capture_decltype): Adjust lookup_name_real.  Don't
        look in namespaces.

2020-08-14  Jason Merrill  <jason@redhat.com>

        PR c++/90254
        PR c++/93711
        * cp-tree.h (unsafe_return_slot_p): Declare.
        * call.c (is_base_field_ref): Rename to unsafe_return_slot_p.
        (build_over_call): Check unsafe_return_slot_p.
        (build_special_member_call): Likewise.
        * init.c (expand_default_init): Likewise.
        * typeck2.c (split_nonconstant_init_1): Likewise.

2020-08-14  Nathan Sidwell  <nathan@acm.org>

        * cp-tree.h (LOOKUP_PREFER_TYPES, LOOKUP_PREFER_NAMESPACES)
        (LOOKUP_NAMESPACES_ONLY, LOOKUP_TYPES_ONLY)
        (LOOKUP_QUALIFIERS_ONL): Delete.
        (LOOKUP_HIDDEN): Adjust.
        * name-lookup.h (enum class LOOK_want): New.
        (operator|, operator&): Overloads for it.
        (lookup_name_real): Replace prefer_type & namespaces_only with
        LOOK_want parm.
        (lookup_qualified_name): Replace prefer_type with LOOK_want.
        (lookup_name_prefer_type): Replace with ...
        (lookup_name): ... this.  New overload with LOOK_want parm.
        * name-lookup.c (struct name_lookup): Replace flags with want and
        hidden fields.  Adjust constructors.
        (name_lookyp::add_overload): Correct hidden stripping test.  Update
        for new LOOK_want type.
        (name_lookup::process_binding): Likewise.
        (name_lookup::search_unqualified): Use hidden flag.
        (identifier_type_value_1): Adjust lookup_name_real call.
        (set_decl_namespace): Adjust name_lookup ctor.
        (lookup_flags): Delete.
        (qualify_lookup): Add LOOK_want parm, adjust.
        (lookup_qualified_name): Replace prefer_type parm with LOOK_want.
        (lookup_name_real_1): Replace prefer_type and namespaces_only with
        LOOK_want parm.
        (lookup_name_real): Likewise.
        (lookup_name_nonclass, lookup_name): Adjust lookup_name_real call.
        (lookup_name_prefer_type): Rename to ...
        (lookup_name): ... here.  New overload with LOOK_want parm.
        (lookup_type_scope_1): Adjust qualify_lookup calls.
        * call.c (build_operator_new_call)
        (add_operator_candidates): Adjust lookup_name_real calls.
        * coroutines.cc (find_coro_traits_template_decl)
        (find_coro_handle_template_decl, morph_fn_to_coro): Adjust
        lookup_qualified_name calls.
        * cp-objcp-common.c (identifier_global_tag): Likewise.
        * decl.c (get_tuple_size, get_tuple_decomp_init): Likewise.
        (lookup_and_check_tag): Use lookup_name overload.
        * parser.c (cp_parser_userdef_numeric_literal): Adjust
        lookup_qualified_name call.
        (prefer_arg_type): Drop template_mem_access parm, return LOOK_want
        value.
        (cp_parser_lookup_name): Adjust lookup_member, lookup_name_real
        calls.
        * pt.c (check_explicit_specialization): Adjust lookup_qualified_name
        call.
        (tsubst_copy_and_build, tsubst_qualified_name): Likewise
        (deduction_guides_for): Likewise.
        (tsubst_friend_class): Adjust lookup_name_real call.
        (lookup_init_capture, tsubst_expr): Likewise.
        * rtti.c (emit_support_tinfos): Adjust lookup_qualified_name call.
        * semantics.c (omp_reduction_lookup): Likewise.
        (capture_decltype): Adjust lookup_name_real call.

2020-08-13  Nathan Sidwell  <nathan@acm.org>

        * name-lookup.h (enum class LOOK_where): New.
        (operator|, operator&): Overloads for it.
        (lookup_name_real): Replace NONCLASS & BLOCK_P parms with WHERE.
        * name-lookup.c (identifier_type_value_w): Adjust
        lookup_name_real call.
        (lookup_name_real_1): Replace NONCLASS and BLOCK_P parameters
        with WHERE bitmask. Don't search namespaces if not asked to.
        (lookup_name_real): Adjust lookup_name_real_1 call.
        (lookup_name_nonclass, lookup_name)
        (lookup_name_prefer_type): Likewise.
        * call.c (build_operator_new_call)
        (add_operator_candidates): Adjust lookup_name_real calls.
        * parser.c (cp_parser_lookup_name): Likewise.
        * pt.c (tsubst_friend_class, lookup_init_capture_pack)
        (tsubst_expr): Likewise.
        * semantics.c (capture_decltype): Likewise.

2020-08-13  Marek Polacek  <polacek@redhat.com>

        PR c++/92812
        * typeck.c (build_static_cast_1): Implement P1975R0 by allowing
        static_cast to aggregate type.

2020-08-10  Jakub Jelinek  <jakub@redhat.com>

        PR c++/96497
        * constexpr.c (cxx_eval_binary_expression): For SPACESHIP_EXPR, tail
        call cxx_eval_constant_expression after genericize_spaceship to avoid
        undesirable further VERIFY_CONSTANT.

2020-08-10  Patrick Palka  <ppalka@redhat.com>

        * pt.c (resolve_overloaded_unification): Drop functions with
        unsatisfied constraints.
        (resolve_nondeduced_context): Likewise.

2020-08-05  Patrick Palka  <ppalka@redhat.com>
            Jason Merrill  <jason@redhat.com>

        PR c++/96282
        * constexpr.c (cxx_eval_vec_init_1): Truncate ctx->ctor and
        then clear CONSTRUCTOR_NO_CLEARING on each appended element
        initializer if we're initializing a previously zero-initialized
        array object.

2020-08-04  Marek Polacek  <polacek@redhat.com>

        PR c++/96082
        * parser.c (cp_parser_elaborated_type_specifier): Allow
        'template' following ::.

2020-08-04  Nathan Sidwell  <nathan@acm.org>

        * parser.c (cp_parser_explicit_specialization): Refactor
        to avoid leak of num_template_parameter_lists value.

2020-08-04  Patrick Palka  <ppalka@redhat.com>

        PR c++/94024
        * init.c (sort_mem_initializers): Preserve TREE_TYPE of the
        member initializer list node.
        (emit_mem_initializers): Set input_location when performing each
        member initialization.
        * parser.c (cp_parser_mem_initializer): Attach the source
        location of this initializer to a dummy EMPTY_CLASS_EXPR
        within the TREE_TYPE of the list node.
        * pt.c (tsubst_initializer_list): Preserve TREE_TYPE of the
        member initializer list node.

2020-08-03  Marek Polacek  <polacek@redhat.com>

        * cp-tree.h (after_nsdmi_defaulted_late_checks): Remove.

2020-08-03  Marek Polacek  <polacek@redhat.com>

        DR 2032
        PR c++/96218
        * pt.c (check_default_tmpl_args): Also consider variable
        templates.

2020-07-31  Jakub Jelinek  <jakub@redhat.com>

        PR c++/96182
        * decl.c (finish_function): In constexpr functions use for C++14 and
        later error instead of warning if no return statement is present and
        diagnose it regardless of warn_return_type.  Move the warn_return_type
        diagnostics earlier in the function.

2020-07-31  Martin Sebor  <msebor@redhat.com>

        PR c++/96003
        * class.c (build_base_path): Set no-warning bit on the synthesized
        conditional expression in static_cast.

2020-07-31  Richard Biener  <rguenther@suse.de>

        PR debug/96383
        * cp-objcp-common.h (LANG_HOOKS_FINALIZE_EARLY_DEBUG):
        Define to c_common_finalize_early_debug.

2020-07-31  Patrick Palka  <ppalka@redhat.com>

        PR c++/96197
        * constexpr.c (cxx_eval_constant_expression) <case CONST_DECL>:
        Pass false to decl_constant_value and decl_really_constant_value
        so that they don't unshare their result.
        * cp-tree.h (decl_constant_value): New declaration with an added
        bool parameter.
        (decl_really_constant_value): Add bool parameter defaulting to
        true to existing declaration.
        * init.c (constant_value_1): Add bool parameter which controls
        whether to unshare the initializer before returning.  Call
        unshare_expr at most once.
        (scalar_constant_value): Pass true to constant_value_1's new
        bool parameter.
        (decl_really_constant_value): Add bool parameter and forward it
        to constant_value_1.
        (decl_constant_value): Likewise, but instead define a new
        overload with an added bool parameter.

2020-07-30  Patrick Palka  <ppalka@redhat.com>

        PR c++/64194
        * pt.c (resolve_overloaded_unification): If the function
        template specialization has a placeholder return type,
        then instantiate it before attempting unification.

2020-07-30  Patrick Palka  <ppalka@redhat.com>

        PR c++/95486
        * pt.c (alias_ctad_tweaks): Call remove_constraints before
        calling set_constraints.

2020-07-30  Patrick Palka  <ppalka@redhat.com>

        PR c++/96106
        * pt.c (reduce_template_parm_level): Propagate DECL_VIRTUAL_P
        from the original TEMPLATE_PARM_DECL to the new lowered one.

2020-07-30  Patrick Palka  <ppalka@redhat.com>

        PR c++/96164
        * constraint.cc (constraints_satisfied_p): Return true if
        !flags_concepts.
        * pt.c (do_type_instantiation): Update a paragraph taken from
        [temp.explicit] to reflect the latest specification.  Don't
        instantiate a member with unsatisfied constraints.

2020-07-29  Jason Merrill  <jason@redhat.com>

        PR c++/91427
        * cp-tree.h (IMPLICIT_RVALUE_P): New.
        (enum cp_lvalue_kind_flags): Add clk_implicit_rval.
        (implicit_rvalue_p, set_implicit_rvalue_p): New.
        * call.c (reference_binding): Check clk_implicit_rval.
        (build_over_call): Adjust C++20 implicit move.
        * coroutines.cc (finish_co_return_stmt): Simplify implicit move.
        * except.c (build_throw): Adjust C++20 implicit move.
        * pt.c (tsubst_copy_and_build) [STATIC_CAST_EXPR]: Propagate
        IMPLICIT_RVALUE_P.
        * tree.c (lvalue_kind): Set clk_implicit_rval.
        * typeck.c (treat_lvalue_as_rvalue_p): Overhaul.
        (maybe_warn_pessimizing_move): Adjust.
        (check_return_expr): Adjust C++20 implicit move.

2020-07-29  Jason Merrill  <jason@redhat.com>

        PR c++/91212
        * call.c (build_over_call): Don't call a const ref
        overload for implicit move.

2020-07-28  Nathan Sidwell  <nathan@acm.org>

        * cp-gimplify.c (cp_genericize_r): Set IMPORTED_DECL's context.
        * cp-objcp-common.c (cp_pushdecl): Set decl's context.
        * decl.c (grokfndecl): Make DECL_CONTEXT setting clearer.

2020-07-28  Nathan Sidwell  <nathan@acm.org>

        * class.c (fixup_type_variants): Copy TYPE_SIZE and
        TYPE_SIZE_UINIT.
        (finish_struct): Call it.

2020-07-28  Nathan Sidwell  <nathan@acm.org>

        * ptree.c (cxx_print_decl): Better indentation.

2020-07-28  Jakub Jelinek  <jakub@redhat.com>
            Mark Wielaard  <mark@klomp.org>

        PR c++/96328
        * parser.c (cp_lexer_safe_previous_token): Don't call
        cp_lexer_previous_token, instead inline it by hand and return NULL
        instead of failing assertion if all previous tokens until the first
        one are purged.
        (cp_parser_error_1): Optimize - only call cp_lexer_safe_previous_token
        if token->type is CPP_NAME.  Use cp_lexer_safe_previous_token instead
        of cp_lexer_previous_token for the missing_token_desc != RT_NONE
        case too.

2020-07-27  Nathan Sidwell  <nathan@acm.org>

        * cp-tree.h (enum cp_tree_index): Add CPTI_AS_BASE_IDENTIFIER.
        (as_base_identifier): Define.
        * decl.c (initialize_predifined_identifiers): Initialize as_base
        identifier.
        * class.c (layout_class_type): Name the as-base type.  Zap
        NSDMI its fields may have.

2020-07-22  Nathan Sidwell  <nathan@acm.org>

        * class.c (maybe_add_class_template_decl_list): Don't add CONST_DECLs.

2020-07-22  Nathan Sidwell  <nathan@acm.org>

        * typeck.c (structural_comptypes): [DECLTYPE_TYPE] break
        apart complex if.
        [UNDERLYING_TYPE]: Use an if.
        [TYPEOF_TYPE]: New.

2020-07-22  Nathan Sidwell  <nathan@acm.org>

        * decl.c (decls_match): Move variables into scopes
        they're needed in.
        (duplicate_decls): Use STRIP_TEMPLATE.
        (build_typename_type): Move var decls to their assignments.
        (begin_function_body): Likewise.
        * decl2.c (get_guard): Likewise.
        (mark_used): Use true for truthiness.
        * error.c (dump_aggr_type): Hold the decl in a var called
        'decl', not 'name'.

2020-07-22  Nathan Sidwell  <nathan@acm.org>

        * cp-tree.h (struct tree_lambda_expr): Shrink
        default_capture_mode & discriminator.

2020-07-22  Nathan Sidwell  <nathan@acm.org>

        * mangle.c (decl_is_template_id): Rename to ...
        (maybe_template_info): ... here.  Return the template info,
        rather than use a pointer.  Adjust all callers.
        (find_substitution): Use template_args_equal, rather than
        local check.

2020-07-22  Tobias Burnus  <tobias@codesourcery.com>

        * parser.c (cp_parser_omp_clause_hint): Require nonnegative hint.
        (cp_parser_omp_critical): Permit hint(0) clause without named critical.
        * pt.c (tsubst_expr): Re-check the latter for templates.

2020-07-21  Sunil K Pandey  <skpgkp2@gmail.com>

        PR target/95237
        * decl.c (cp_finish_decl): Call target hook
        lower_local_decl_alignment to lower local decl alignment.

2020-07-21  Nathan Sidwell  <nathan@acm.org>

        * parser.c (cp_lexer_consume_token): Drop PRAGMA_EOL assert.
        (cp_parser_skip_to_closing_parenthesis_1): Only pass start token
        to pragma skipper if recovering.
        (cp_parser_skip_to_pragma_eol): Only purge and change pragma
        state when recovering.

2020-07-20  Jason Merrill  <jason@redhat.com>

        * pt.c (type_dependent_expression_p): A pseudo-dtor can be
        dependent.
        * semantics.c (finish_call_expr): Use build_trivial_dtor_call for
        pseudo-destructor.
        (finish_pseudo_destructor_expr): Leave type NULL for dependent arg.

2020-07-20  Jason Merrill  <jason@redhat.com>

        * mangle.c (write_base_ref): New.
        (write_expression): Use it for base field COMPONENT_REFs.
        * pt.c (invalid_tparm_referent_p): Canonicalize the type
        of array offsets.  Allow subobjects.

2020-07-20  Jason Merrill  <jason@redhat.com>

        * pt.c (collect_ctor_idx_types): Add 'const' when deducing from
        a string constant.

2020-07-17  Marek Polacek  <polacek@redhat.com>

        PR c++/79815
        * decl.c (grokdeclarator): Detect cv-qual decltype(auto).
        * pt.c (do_auto_deduction): Likewise.

2020-07-16  Iain Sandoe  <iain@sandoe.co.uk>

        PR c++/95591
        PR c++/95599
        PR c++/95823
        PR c++/95824
        PR c++/95895
        * coroutines.cc (struct coro_ret_data): Delete.
        (coro_maybe_expand_co_return): Delete.
        (co_return_expander): Delete.
        (expand_co_returns): Delete.
        (co_await_find_in_subtree): Remove unused name.
        (build_actor_fn): Remove unused parm, remove handling
        for co_return expansion.
        (register_await_info): Demote duplicate info message to a
        warning.
        (coro_make_frame_entry): Move closer to use site.
        (struct susp_frame_data): Add fields for final suspend label
        and a flag to indicate await expressions with initializers.
        (captures_temporary): Delete.
        (register_awaits): Remove unused code, update comments.
        (find_any_await): New.
        (tmp_target_expr_p): New.
        (struct interesting): New.
        (find_interesting_subtree): New.
        (struct var_nest_node): New.
        (flatten_await_stmt): New.
        (handle_nested_conditionals): New.
        (process_conditional): New.
        (replace_statement_captures): Rename to...
        (maybe_promote_temps): ... this.
        (maybe_promote_captured_temps): Delete.
        (analyze_expression_awaits): Check for await expressions with
        initializers.  Simplify handling for truth-and/or-if.
        (expand_one_truth_if): Simplify (map cases that need expansion
        to COND_EXPR).
        (await_statement_walker): Handle CO_RETURN_EXPR. Simplify the
        handling for truth-and/or-if expressions.
        (register_local_var_uses): Ensure that we create names in the
        implementation namespace.
        (morph_fn_to_coro): Add final suspend label to suspend frame
        callback data and remove it from the build_actor_fn call.

2020-07-16  Marek Polacek  <polacek@redhat.com>

        * call.c (convert_like): Remove macro and introduce a new
        wrapper instead.
        (convert_like_with_context): Likewise.
        (convert_like_real): Rename to convert_like.
        (convert_like_real_1): Rename to convert_like_internal.  Call
        convert_like instead of convert_like_real therein.
        (perform_direct_initialization_if_possible): Call convert_like
        instead of convert_like_real.

2020-07-16  Iain Sandoe  <iain@sandoe.co.uk>

        * coroutines.cc: Correct some spelling errors
        in comments.

2020-07-15  Nathan Sidwell  <nathan@acm.org>

        * parser.c (cp_parser_declaration): Avoid copying tokens.
        (cp_parser_block_declaration): RAII token pointer.

2020-07-15  Nathan Sidwell  <nathan@acm.org>

        * parser.c (cp_parser_skip_to_closing_parenthesis_1): Deal with
        meeting a deferred pragma.
        (cp_parser_skip_to_end_of_statement): Likewise.
        (cp_parser_skip_to_end_of_block_or_statement): Likewise.
        (cp_parser_skip_to_pragma_eol): We should never meet EOF.
        (cp_parser_omp_declare_simd): Likewise.
        (cp_parser_omp_declare_reduction, cp_parser_oacc_routine)
        (pragma_lex): Likewise.

2020-07-14  Marek Polacek  <polacek@redhat.com>

        PR c++/95789
        PR c++/96104
        PR c++/96179
        * call.c (convert_like_real_1): Renamed from convert_like_real.
        (convert_like_real): New wrapper for convert_like_real_1.

2020-07-14  Nathan Sidwell  <nathan@acm.org>

        * parser.c (cp_lexer_alloc): Do not deal with PCH here.
        (cp_lexer_new_main): Deal with PCH here.  Store the tokens directly
        into the buffer.
        (cp_lexer_new_from_tokens): Assert last token isn't purged either.
        (cp_lexer_get_preprocessor_token): Change first arg to flags, adjust.
        (cp_parser_new): Pass the lexer in, don't create it here.
        (cp_parser_translation_unit): Initialize access checks here.
        (cp_parser_initial_pragma): First token is provided by caller,
        don't deal with PCH stopping here.  Adjust error message.
        (c_parse_file): Adjust, change error message to avoid C++20 module
        confusion.

2020-07-14  Nathan Sidwell  <nathan@acm.org>

        * ptree.c (cxx_print_type): Add TYPEOF_TYPE and BASES.

2020-07-14  Nathan Sidwell  <nathan@acm.org>

        * class.c (build_base_field_1): Cache CLASSTYPE_AS_BASE.
        (build_self_reference): Rename value -> decl.
        (dump_class_hierarchy_1): Cache CLASSTYPE_AS_BASE.

2020-07-14  Marek Polacek  <polacek@redhat.com>

        PR c++/95820
        * decl.c (grokdeclarator) <case cdk_function>: Check also
        pointers/references/... to functions.

2020-07-14  Nathan Sidwell  <nathan@acm.org>

        * cp-tree.h: Correct some tree lang flag comments,
        reformat some structure definitions.  Note some structure
        sizes.  Clarify some comments.
        (yyungetc): Delete.  Not been a thing for some time.
        * class.c (copy_fndecl_with_name): Comment.
        (check_bases_and_members): Unnecessary {}.
        (layout_class_type): Comment.
        * cp-tree.def (UNBOUND_CLASS_TEMPLATE): Adjust comment.
        * decl.c:  Fix some formatting & whitespace issues.
        (function_requirements_equivalent_p): Note why
        substitutions are needed.
        * decl2.c (no_linkage_error): Note that heroics about
        'typedef struct { ... };' are no longer needed.
        * method.c: Whitespace.
        * name-lookup.c: Whitespace.
        (add_decl_to_level): Reformat a line.
        (print_binding_stack): Mark as DEBUG_FUNCTION.
        (has_using_namespace_std_directive_p): Delete comment.
        * pt.c: Whitespace
        * ptree.c: Whitespace.
        * rtti.c: Whitespace & comment.
        * tree.c: Comment.
        * typeck.c (structural_comptypes): Add comment.

2020-07-13  Nathan Sidwell  <nathan@acm.org>

        * Make-lang.in (c++.disclean): Likewise.

2020-07-13  Marek Polacek  <polacek@redhat.com>

        PR c++/96077
        * parser.c (cp_parser_enum_specifier): Commit to tentative parse
        after we've seen an opening brace.

2020-07-10  Jason Merrill  <jason@redhat.com>

        * tree.c (structural_type_p): Allow unions.
        * mangle.c (write_expression): Express unions with a designator.

2020-07-10  Jason Merrill  <jason@redhat.com>

        * pt.c (convert_nontype_argument): Handle REAL_TYPE.
        (invalid_nontype_parm_type_p): Allow all structural types.
        * tree.c (structural_type_p): Use SCALAR_TYPE_P.

2020-07-10  Jason Merrill  <jason@redhat.com>

        PR c++/96105
        PR c++/96052
        PR c++/95976
        * class.c (check_field_decls): An array of empty classes is not an
        empty data member.
        (layout_empty_base_or_field): Handle explicit alignment.
        Fix union handling.

2020-07-09  Julian Brown  <julian@codesourcery.com>
            Thomas Schwinge  <thomas@codesourcery.com>

        PR middle-end/95270
        * semantics.c (finish_omp_clauses): Likewise.

2020-07-09  Patrick Palka  <ppalka@redhat.com>

        PR c++/96132
        * constexpr.c (potential_constant_expression_1) <case PARM_DECL>:
        Restore dependent_type_p check that guarded the call to
        is_really_empty_class.

2020-07-08  Patrick Palka  <ppalka@redhat.com>

        PR c++/95497
        * constexpr.c (potential_constant_expression_1) <case PARM_DECL>:
        When processing_template_decl, check COMPLETE_TYPE_P before
        calling is_really_empty_class.  Don't check dependent_type_p.

2020-07-08  Marek Polacek  <polacek@redhat.com>

        PR c++/96103
        * parser.c (cp_parser_decltype): Print error about using decltype(auto)
        in C++11.  Check that the token following "auto" is ")".

2020-07-07  Patrick Palka  <ppalka@redhat.com>

        PR c++/95303
        * cxx-pretty-print.c (pp_cxx_unqualified_id): Check
        PRIMARY_TEMPLATE_P before printing the innermost template
        arguments.

2020-07-07  Martin Sebor  <msebor@redhat.com>

        PR c++/96063
        * parser.c (class_decl_loc_t::diag_mismatched_tags): Print notes only
        if warning_at returns nonzero.

2020-07-06  Martin Sebor  <msebor@redhat.com>

        PR c++/95984
        * call.c (build_over_call): Check calls only when tf_warning is set.

2020-07-06  Nathan Sidwell  <nathan@acm.org>

        * decl.c (push_library_fn): Return the decl pushdecl_toplevel returns.
        * except.c (verify_library_fn): Replace with ...
        (declare_library_fn_1): ... this fn.  Always push the fn.
        (declare_library_fn): Call it.
        (build_throw): Call declare_library_fn_1.

2020-07-06  Jonathan Wakely  <jwakely@redhat.com>

        PR c++/96068
        * parser.c (cp_parser_toplevel_declaration): Only do pedwarn for
        empty-declaration in C++98.

2020-07-02  Jason Merrill  <jason@redhat.com>
            Jakub Jelinek  <jakub@redhat.com>

        * decl.c (grokfndecl): Allow consteval virtual.
        * search.c (check_final_overrider): Check consteval mismatch.
        * constexpr.c (cxx_eval_thunk_call): New.
        (cxx_eval_call_expression): Call it.
        * cvt.c (cp_get_fndecl_from_callee): Handle FDESC_EXPR.
        * decl2.c (mark_vtable_entries): Track vtables with consteval.
        (maybe_emit_vtables): Pass consteval_vtables through.
        (clear_consteval_vfns): Replace consteval with nullptr.
        (c_parse_final_cleanups): Call it.

2020-07-01  Nathan Sidwell  <nathan@acm.org>

        * class.c (copy_fndecl_with_name): Add additional predicate args, do
        not deduce them locally.
        (copy_operator_fn): Adjust copy_fndecl_with_name call.
        (build_clone): Add vtt and inherited predicate args.  Pass through
        to copy_fndecl_with_name call.
        (build_cdtor_clones): Likewise, pass through to build_clone as
        needed.
        (build_cdtor): Determine vtt and inherited here.
        * cp-tree.h (DECL_NEEDS_CTT_PARM_P): Delete.

2020-06-30  Nathan Sidwell  <nathan@acm.org>

        * cp-tree.h (copy_fndecl_with_name): Rename to ...
        (copy_operatorn_fn): ... this.  Change arg type.
        (clone_function_decl): Rename to ...
        (clone_cdtor): ... this.
        * class.c (copy_fndecl_with_name): Make static.
        (copy_operator_fn): New wrapper.
        (build_clones): Rename to ...
        (build_cdtor_clones): ... this.
        (clone_function_decl): Rename to ...
        (clone_cdtor): ... this.  Adjust build_clones calls.
        (clone_constructors_and_destructors): Adjust clone_function_decl
        calls.
        * method.c (implicitly_declare_fn): Adjust copy_fndecl_with_name
        call.
        (lazily_declare_fn): Adjust clone_function_decl call.
        * pt.c (tsubst_function_decl): Likewise.
        (instantiate_template_1): Likewise.

2020-06-30  Iain Sandoe  <iain@sandoe.co.uk>

        * coroutines.cc (morph_fn_to_coro): Remove trailing
        space in a diagnostic.

2020-06-30  Iain Sandoe  <iain@sandoe.co.uk>

        * coroutines.cc (expand_one_await_expression): Remove
        code dealing with initial suspend.
        (build_actor_fn): Remove code special-casing initial
        and final suspend. Handle the final suspend and marking
        of the coroutine as done.
        (coro_rewrite_function_body): New.
        (bind_expr_find_in_subtree): Remove.
        (coro_body_contains_bind_expr_p): Remove.
        (morph_fn_to_coro): Split the rewrite of the original
        function into coro_rewrite_function_body and call it.

2020-06-29  Marek Polacek  <polacek@redhat.com>

        PR c++/94553
        * decl.c (duplicate_decls): Make sure a concept or a variable
        template is unique in its declarative region.

2020-06-29  Marek Polacek  <polacek@redhat.com>

        PR c++/95568
        * pt.c (collect_ctor_idx_types): Use TREE_TYPE.

2020-06-28  Iain Sandoe  <iain@sandoe.co.uk>

        PR c++/95711
        * coroutines.cc (register_local_var_uses): Skip past
        namespace decls.

2020-06-27  Iain Sandoe  <iain@sandoe.co.uk>

        PR c++/95736
        * coroutines.cc (get_awaitable_var): New helper.
        (build_co_await): Check more carefully before
        copying an awaitable.
        (expand_one_await_expression): No initializer
        is required when the awaitable is not a temp.
        (register_awaits): Remove handling that is now
        completed when the await expression is built.

2020-06-27  Iain Sandoe  <iain@sandoe.co.uk>

        * coroutines.cc (morph_fn_to_coro): Diagnose unavailable
        get_return_object_on_allocation_failure.

2020-06-26  Iain Sandoe  <iain@sandoe.co.uk>

        PR c++/95519
        * coroutines.cc (struct coroutine_info):Add a field
        to hold computed p.return_void expressions.
        (coro_build_promise_expression): New.
        (get_coroutine_return_void_expr): New.
        (finish_co_yield_expr): Build the promise expression
        using coro_build_promise_expression.
        (finish_co_return_stmt): Likewise.
        (build_init_or_final_await): Likewise.
        (morph_fn_to_coro): Likewise, for several cases.

2020-06-26  Iain Sandoe  <iain@sandoe.co.uk>

        * coroutines.cc (morph_fn_to_coro): Handle error
        returns in building g-r-o-o-a-f expressions.

2020-06-24  Nicholas Krause  <xerofoify@gmail.com>

        PR c++/95672
        * typeck2.c (cxx_incomplete_type_diagnostic): Add missing
        TYPE_EXPANSION_PACK check for diagnosing incomplete types in
        cxx_incomplete_type_diagnostic.

2020-06-24  Iain Sandoe  <iain@sandoe.co.uk>

        PR c++/95518
        PR c++/95813
        * coroutines.cc (act_des_fn): Copy function
        attributes onto the outlined coroutine helpers.

2020-06-24  Jason Merrill  <jason@redhat.com>

        * call.c (build_over_call): Only call build_base_path once.

2020-06-24  Jason Merrill  <jason@redhat.com>

        PR c++/95719
        * call.c (build_over_call): Look up the overrider in base_binfo.
        * class.c (lookup_vfn_in_binfo): Look through BINFO_PRIMARY_P.

2020-06-23  Jason Merrill  <jason@redhat.com>

        PR c++/93976
        Implement C++20 P2082R1, Fixing CTAD for aggregates.
        * cp-tree.h (TPARMS_PRIMARY_TEMPLATE): Split out from...
        (DECL_PRIMARY_TEMPLATE): ...here.
        (builtin_guide_p): Declare.
        * decl.c (reshape_init_class): Handle bases of a template.
        (reshape_init_r): An array with dependent bound takes a single
        initializer.
        * pt.c (tsubst_default_argument): Shortcut {}.
        (unify_pack_expansion): Allow omitted arguments to trailing pack.
        (builtin_guide_p): New.
        (collect_ctor_idx_types): Give a trailing pack a {} default
        argument.  Handle arrays better.

2020-06-23  Iain Sandoe  <iain@sandoe.co.uk>

        PR c++/95477
        * coroutines.cc (morph_fn_to_coro): Apply a cleanup to
        the get return object when the DTOR is non-trivial.

2020-06-20  Iain Sandoe  <iain@sandoe.co.uk>

        PR c++/95505
        * coroutines.cc (morph_fn_to_coro): Update handling of
        get-return-object-on-allocation-fail and diagnose missing
        std::nothrow.

2020-06-20  Jason Merrill  <jason@redhat.com>

        * call.c (joust): Only compare constraints for non-template
        candidates with matching parameters.
        * pt.c (tsubst_pack_expansion): Fix getting a type parameter
        pack.
        (more_specialized_fn): Only compare constraints for candidates with
        matching parameters.

2020-06-19  Jason Merrill  <jason@redhat.com>

        * method.c (early_check_defaulted_comparison): Allow defaulting
        comparison outside class.  Complain if non-member operator isn't a
        friend.

2020-06-18  Jason Merrill  <jason@redhat.com>

        * method.c (early_check_defaulted_comparison): Check for &&.
        (build_comparison_op): Allow empty union.  Diagnose non-category
        type.
        (common_comparison_type): Remove handling for non-category type.

2020-06-18  Marek Polacek  <polacek@redhat.com>

        PR c++/95735
        * pt.c (finish_template_variable): Return if
        coerce_innermost_template_parms return error_mark_node.

2020-06-18  Marek Polacek  <polacek@redhat.com>

        PR c++/95728
        * pt.c (tsubst_copy_and_build) <case NEW_EXPR>: Return error_mark_node
        if placement is erroneous.

2020-06-17  Jonathan Wakely  <jwakely@redhat.com>

        PR c++/66159
        * parser.c (cp_parser_elaborated_type_specifier): Do not warn
        unless in a declaration.

2020-06-17  Jason Merrill  <jason@redhat.com>

        * cp-tree.h (copy_fndecl_with_name): Declare.
        * class.c (copy_fndecl_with_name): Split out from...
        (build_clone): ...here.
        (add_implicitly_declared_members): Add op== to TYPE_FIELDS.
        * method.c (implicitly_declare_fn): Use copy_fndecl_with_name.

2020-06-17  Jason Merrill  <jason@redhat.com>

        * call.c (build_new_op_1): Don't look for a CALL_EXPR when
        calling a consteval function.

2020-06-17  Jason Merrill  <jason@redhat.com>

        * decl2.c (grokfield): Pass SD_DEFAULTED and SD_DELETED.
        * decl.c (duplicate_decls): Reduce error for delete
        after earlier declaration to pedwarn.

2020-06-17  Marek Polacek  <polacek@redhat.com>

        PR c++/95508
        * constexpr.c (maybe_fold_non_dependent_expr): New.
        * cp-tree.h (maybe_fold_non_dependent_expr): Declare.
        * typeck.c (cp_build_array_ref): Call maybe_fold_non_dependent_expr
        instead of maybe_constant_value.

2020-06-16  Marek Polacek  <polacek@redhat.com>

        PR c++/95369
        * call.c (add_list_candidates): Return if a designated initializer
        is used with a non-aggregate.
        (implicit_conversion_error): Give an error for the case above.

2020-06-16  Marek Polacek  <polacek@redhat.com>

        PR c++/95560
        * name-lookup.c (check_local_shadow): Check if types are
        non-null before calling same_type_p.

2020-06-16  Jakub Jelinek  <jakub@redhat.com>

        * semantics.c (handle_omp_for_class_iterator): Adjust
        c_omp_check_loop_iv_exprs caller.
        (finish_omp_for): Likewise.  Don't call fold_build_cleanup_point_expr
        before calling c_finish_omp_for and c_omp_check_loop_iv, move it
        after those calls.
        * pt.c (tsubst_omp_for_iterator): Handle non-rectangular loops.

2020-06-16  Jakub Jelinek  <jakub@redhat.com>

        * parser.c (cp_parser_omp_clause_schedule): Reject modifier separated
        from kind by comma rather than colon.

2020-06-16  Patrick Palka  <ppalka@redhat.com>

        * pt.c (perform_instantiation_time_access_checks): No need to
        tsubst into decl.
        * semantics.c (enforce_access): Verify that decl is not
        dependent.

2020-06-16  Patrick Palka  <ppalka@redhat.com>

        PR c++/41437
        PR c++/47346
        * cp-tree.h (qualified_typedef_usage_s): Delete.
        (qualified_typedef_usage_t): Delete.
        (deferred_access_check): Move up in file.
        (tree_template_info::typedefs_needing_access_checking): Delete.
        (tree_template_info::deferred_access_checks): New field.
        (TI_TYPEDEFS_NEEDING_ACCESS_CHECKING): Rename to ...
        (TI_DEFERRED_ACCESS_CHECKS): ... this, and adjust accordingly.
        * pt.c (perform_typedefs_access_check): Rename to ...
        (perform_instantiation_time_access_checks): ... this, and adjust
        accordingly.  Remove unnecessary tree tests.
        (instantiate_class_template_1): Adjust accordingly.
        (instantiate_decl): Likewise.
        * semantics.c (enforce_access): Likewise.

2020-06-16  Patrick Palka  <ppalka@redhat.com>

        PR c++/41437
        PR c++/47346
        * call.c (enforce_access): Move to semantics.c.
        * cp-tree.h (enforce_access): Delete.
        (get_types_needing_access_check): Delete.
        (add_typedef_to_current_template_for_access_check): Delete.
        * decl.c (make_typename_type): Adjust accordingly.  Use
        check_accessibility_of_qualified_id instead of directly using
        perform_or_defer_access_check.
        * parser.c (cp_parser_template_declaration_after_parameters):
        Don't push a dk_no_check access state when parsing a template.
        * pt.c (get_types_needing_access_check): Delete.
        (append_type_to_template_for_access_check_1): Delete.
        (perform_typedefs_access_check): Adjust.  If type_decl is a
        FIELD_DECL, also check its DECL_CONTEXT for dependence. Use
        tsubst_copy instead of tsubst to substitute into type_decl so
        that we substitute into the DECL_CONTEXT of a FIELD_DECL.
        (append_type_to_template_for_access_check): Delete.
        * search.c (accessible_p): Remove the processing_template_decl
        early exit.
        * semantics.c (enforce_access): Moved from call.c.  If we're
        parsing a template and the access check failed, add the check to
        TI_TYPEDEFS_NEEDING_ACCESS_CHECKING.
        (perform_or_defer_access_check): Adjust comment.
        (add_typedef_to_current_template_for_access_check): Delete.
        (check_accessibility_of_qualified_id):  Adjust accordingly.
        Exit early if the scope is dependent.

2020-06-11  Patrick Palka  <ppalka@redhat.com>

        PR c++/93467
        * constraint.cc (associate_classtype_constraints): If there is a
        discrepancy between the current template depth and the template
        depth of the original declaration, then adjust the template
        parameter depth within the current constraints appropriately.
        * pt.c (tsubst_friend_class): Substitute into and set the
        constraints on the injected declaration.

2020-06-11  Iain Sandoe  <iain@sandoe.co.uk>

        * coroutines.cc (instantiate_coro_traits): Pass a reference
        to lambda closure objects to traits instantiation.
        (morph_fn_to_coro): Likewise for promise parameter
        preview and allocator lookup.

2020-06-10  Iain Sandoe  <iain@sandoe.co.uk>

        PR c++/95440
        * call.c (add_candidates): Use vec_safe_length() for
        testing the arguments list.
        (build_new_method_call_1): Use vec_safe_is_empty() when
        checking for an empty args list.

2020-06-10  Marek Polacek  <polacek@redhat.com>

        PR c++/95562
        * parser.c (cp_parser_direct_declarator): Clear
        CP_PARSER_FLAGS_DELAY_NOEXCEPT if the declarator kind is not
        cdk_id.

2020-06-09  Iain Sandoe  <iain@sandoe.co.uk>

        PR c++/95137
        * coroutines.cc (expand_one_await_expression): Build separate
        DTOR trees for the awaitable object on the destroy and resume
        paths.

2020-06-09  Jason Merrill  <jason@redhat.com>

        PR c++/95552
        * cp-gimplify.c (predeclare_vla): Only predeclare a VLA if it's
        wrapped in a pointer type.

2020-06-05  Marek Polacek  <polacek@redhat.com>

        PR c++/95369
        * call.c (build_converted_constant_expr_internal): Allow
        list-initialization.

2020-06-05  Iain Sandoe  <iain@sandoe.co.uk>

        * cp-tree.def (CO_RETURN_EXPR): Correct the class
        to use tcc_statement.

2020-06-05  Jason Merrill  <jason@redhat.com>

        * error.c (dump_binary_op): Handle negative operand to
        POINTER_PLUS_EXPR.

2020-06-04  Jason Merrill  <jason@redhat.com>

        PR c++/93310
        * constexpr.c (cxx_eval_constant_expression) [OBJ_TYPE_REF]:
        Evaluate OBJ_TYPE_REF_EXPR.

2020-06-04  Jason Merrill  <jason@redhat.com>

        PR c++/95158
        * class.c (lookup_vfn_in_binfo): New.
        * call.c (build_over_call): Use it.
        * cp-tree.h (resolves_to_fixed_type_p): Add default argument.
        (lookup_vfn_in_binfo): Declare.

2020-06-04  Iain Sandoe  <iain@sandoe.co.uk>

        PR c++/95346
        * coroutines.cc (morph_fn_to_coro): Ensure that the get-
        return-object is constructed correctly; When it is not the
        final return value, pass it to the CTOR of the return type
        as an rvalue, per the standard comment.

2020-06-04  Jakub Jelinek  <jakub@redhat.com>

        PR c++/82304
        PR c++/95307
        * constexpr.c (cxx_eval_constant_expression): Diagnose CONVERT_EXPR
        conversions from pointer types to arithmetic types here...
        (cxx_eval_outermost_constant_expr): ... instead of here.

2020-06-03  Mark Wielaard  <mark@klomp.org>

        * parser.c (cp_lexer_safe_previous_token): New function.
        (cp_parser_error_1): Add name_hint if the previous token is
        a string literal and next token is a CPP_NAME and we have a
        missing header suggestion for the name.

2020-06-03  Patrick Palka  <ppalka@redhat.com>

        * pt.c (process_partial_specialization): Pass the full set of
        generic template arguments to strictly_subsumes.

2020-06-03  Patrick Palka  <ppalka@redhat.com>

        PR c++/92103
        * pt.c (most_specialized_partial_spec): Reorganize the loop over
        DECL_TEMPLATE_SPECIALIZATIONS.  Check constraints_satisfied_p on
        the original template declaration, not on the tsubsted one.

2020-06-03  Iain Sandoe  <iain@sandoe.co.uk>

        PR c++/95345
        * coroutines.cc (finish_co_await_expr): Revise to allow for
        parameter packs.
        (finish_co_yield_expr): Likewise.

2020-06-03  Jason Merrill  <jason@redhat.com>

        PR c++/95232
        * cp-tree.h (predeclare_vla): Declare.
        * cp-gimplify.c (predeclare_vla): Handle getting a decl.
        * pt.c (tsubst_expr) [DECL_EXPR]: Use it.

2020-06-03  Tobias Burnus  <tobias@codesourcery.com>

        * cp-gimplify.c (cxx_omp_predetermined_mapping): New.
        * cp-objcp-common.h (LANG_HOOKS_OMP_PREDETERMINED_MAPPING): Redfine.
        * cp-tree.h (cxx_omp_predetermined_mapping): Declare.

2020-06-02  Jason Merrill  <jason@redhat.com>

        PR c++/95193
        * pt.c (tsubst_decl): Relax assert.

2020-06-02  Iain Sandoe  <iain@sandoe.co.uk>

        PR c++/95050
        * coroutines.cc (build_co_await): Wrap the co_await expression
        in a TARGET_EXPR, where needed.
        (finish_co_yield_expr): Likewise.

2020-06-02  Patrick Palka  <ppalka@redhat.com>

        PR c++/92633
        PR c++/92838
        * pt.c (tsubst_function_decl): Don't do set_constraints when
        regenerating a lambda.
        (tsubst_lambda_expr): Substitute into the lambda's constraints
        and do set_constraints here.

2020-06-01  Jason Merrill  <jason@redhat.com>

        PR c++/95466
        PR c++/95311
        PR c++/95221
        * class.c (build_vfn_ref): Revert 95311 change.
        * cp-ubsan.c (cp_ubsan_maybe_instrument_member_call): Build a
        COMPOUND_EXPR.

2020-06-01  Iain Sandoe  <iain@sandoe.co.uk>

        PR c++/95350
        * coroutines.cc (struct param_info): Remove rv_ref field.
        (build_actor_fn): Remove specifial rvalue ref handling.
        (morph_fn_to_coro): Likewise.

2020-05-31  Iain Sandoe  <iain@sandoe.co.uk>

        PR c++/95087
        * coroutines.cc (morph_fn_to_coro): If we see an
        early fatal error, drop the erroneous function body.

2020-05-31  Iain Sandoe  <iain@sandoe.co.uk>

        * coroutines.cc (build_co_await): Remove unused
        variable.
        (finish_co_await_expr): Likewise.
        (finish_co_yield_expr): Likewise; revise comment.

2020-05-30  Iain Sandoe  <iain@sandoe.co.uk>

        * coroutines.cc (morph_fn_to_coro): Revise initialization
        of the frame pointer to avoid an unused value.

2020-05-30  Patrick Palka  <ppalka@redhat.com>

        PR c++/95386
        * constraint.cc (satisfaction_value): Accept INTEGER_CST of any
        boolean type.

2020-05-29  Patrick Palka  <ppalka@redhat.com>
            Jason Merrill  <jason@redhat.com>

        PR c++/95181
        * class.c (add_method): Let special member function templates
        coexist if they are not equivalently constrained, or in a class
        template.

2020-05-29  Jason Merrill  <jason@redhat.com>

        PR c++/95371
        * pt.c (process_template_parm): Set DECL_TEMPLATE_INFO
        on the DECL_TEMPLATE_RESULT.

2020-05-29  Marek Polacek  <polacek@redhat.com>

        PR c++/95344
        * cp-gimplify.c (cp_fold) <case MODIFY_EXPR>: Don't set
        TREE_THIS_VOLATILE here.
        (cp_fold): Set it here along with TREE_NO_WARNING.

2020-05-29  Jason Merrill  <jason@redhat.com>

        PR c++/95311
        PR c++/95221
        * class.c (build_vfn_ref): Don't fold the INDIRECT_REF.

2020-05-29  Patrick Palka  <ppalka@redhat.com>

        PR c++/92652
        PR c++/93698
        PR c++/94128
        * parser.c (cp_parser_requires_clause_expression): Temporarily
        increment processing_template_decl only if it is 0.
        (cp_parser_constraint_expression): Likewise.
        (cp_parser_requires_expression): Likewise.

2020-05-29  Patrick Palka  <ppalka@redhat.com>

        PR c++/95241
        * constexpr.c (get_or_insert_ctor_field): Add limited support
        for RANGE_EXPR index lookups.

2020-05-28  Jakub Jelinek  <jakub@redhat.com>

        PR c++/95328
        * decl.c (cp_finish_decomp): Call complete_type before checking
        COMPLETE_TYPE_P.

2020-05-28  Jason Merrill  <jason@redhat.com>

        PR c++/94926
        * decl.c (cp_finish_decl): Revert r9-297 change.
        (check_static_variable_definition): Likewise.
        * constexpr.c (ensure_literal_type_for_constexpr_object): Likewise.
        * pt.c (instantiate_decl): Return early on type error.

2020-05-27  Jason Merrill  <jason@redhat.com>

        PR c++/95319
        * decl.c (reshape_init_array_1): Don't reuse in overload context.

2020-05-27  Jason Merrill  <jason@redhat.com>

        PR c++/95242
        * call.c (build_new_op_1): Suppress
        warn_zero_as_null_pointer_constant across comparison of <=> result
        to 0.

2020-05-27  Jason Merrill  <jason@redhat.com>

        PR c++/95222
        * decl.c (grokdeclarator): Don't shift attributes in TYPENAME
        context.

2020-05-27  Nathan Sidwell  <nathan@acm.org>

        PR c++/95263
        * pt.c (lookup_template_class_1): Restore alias template mutation.

2020-05-26  Jakub Jelinek  <jakub@redhat.com>

        PR c++/95197
        * cp-gimplify.c: Include omp-general.h.
        (cp_genericize_r) <case OMP_DISTRIBUTE>: For class iteration
        variables in composite distribute parallel for, instantiate copy
        ctor of their types.

2020-05-23  Patrick Palka  <ppalka@redhat.com>

        PR c++/94038
        * constexpr.c (cxx_eval_constant_expression)
        <case TEMPLATE_ID_EXPR>: Don't evaluate the concept when
        constexpr evaluation is uid-sensitive.

2020-05-22  Jason Merrill  <jason@redhat.com>

        * cp-gimplify.c (cp_gimplify_expr) [CALL_EXPR]: Don't preevaluate
        the function address if the call used operator syntax.

2020-05-21  Jason Merrill  <jason@redhat.com>

        PR c++/95221
        * cp-ubsan.c (cp_ubsan_maybe_instrument_member_call): For a virtual
        call, instrument the OBJ_TYPE_REF.

        * decl.c (compute_array_index_type_loc): Diagnose expressions
        in a template that can't be constant.
        * parser.c (cp_parser_direct_declarator): Don't check
        non-constant array bounds here.

        * cp-tree.h (is_rvalue_constant_expression): Declare.
        * constexpr.c (is_rvalue_constant_expression): New.
        * parser.c (cp_parser_constant_expression): Use it.
        * decl.c (cp_finish_decl): Try to treat a constexpr initializer in a
        template as constant.

        * typeck.c (build_x_modify_expr): Handle error_mark_node arguments.

        * decl.c (grokparms): Return NULL_TREE if any parms were erroneous.

2020-05-21  Iain Sandoe  <iain@sandoe.co.uk>

        * coroutines.cc (finish_co_return_stmt): Revert change to use
        finish_expr_stmt.

2020-05-21  Patrick Palka  <ppalka@redhat.com>

        PR c++/94038
        * constexpr.c (constexpr_ctx::uid_sensitive): Remove field.
        (uid_sensitive_constexpr_evaluation_value): Define.
        (uid_sensitive_constexpr_evaluation_true_counter): Define.
        (uid_sensitive_constexpr_evaluation_p): Define.
        (uid_sensitive_constexpr_evaluation_sentinel): Define its
        constructor.
        (uid_sensitive_constexpr_evaluation_checker): Define its
        constructor and its evaluation_restricted_p method.
        (get_fundef_copy): Remove 'ctx' parameter.  Use u_s_c_e_p
        instead of constexpr_ctx::uid_sensitive.
        (cxx_eval_call_expression): Use u_s_c_e_p instead, and test it
        last.  Adjust call to get_fundef_copy.
        (instantiate_cx_fn_r): Test u_s_c_e_p so that we increment the
        counter if necessary.
        (cxx_eval_outermost_constant_expr): Remove 'uid_sensitive'
        parameter.  Adjust function body accordingly.
        (maybe_constant_value): Remove 'uid_sensitive' parameter and
        adjust function body accordingly.  Set up a
        uid_sensitive_constexpr_evaluation_checker, and use it to
        conditionally update the cv_cache.
        * cp-gimplify.c (cp_fold): Set up a
        uid_sensitive_constexpr_evaluation_checker, and use it to
        conditionally update the fold_cache.
        * cp-tree.h (maybe_constant_value): Update declaration.
        (struct uid_sensitive_constexpr_evaluation_sentinel): Define.
        (struct sensitive_constexpr_evaluation_checker): Define.
        * expr.c (fold_for_warn): Set up a
        uid_sensitive_constexpr_evaluation_sentinel before calling
        the folding subroutines.  Drop all but the first argument to
        maybe_constant_value.

2020-05-20  Marek Polacek  <polacek@redhat.com>

        DR 2237
        * parser.c (cp_parser_unqualified_id): Reject simple-template-id as
        the declarator-id of a destructor.
        (cp_parser_constructor_declarator_p): Reject simple-template-id as
        the declarator-id of a constructor.

2020-05-20  Marek Polacek  <polacek@redhat.com>

        DR 2289
        PR c++/94553
        * cp-tree.h (SD_DECOMPOSITION): New flag.
        * decl.c (duplicate_decls): Make sure a structured binding is unique
        in its declarative region.
        (start_decl): If INITIALIZED is SD_DECOMPOSITION, call
        fit_decomposition_lang_decl.
        (grokdeclarator): Compare INITIALIZED directly to SD_* flags.
        * parser.c (cp_parser_decomposition_declaration): Pass SD_DECOMPOSITION
        to start_decl.

2020-05-20  Patrick Palka  <ppalka@redhat.com>

        PR c++/95223
        * typeck.c (structural_comptypes): Don't perform
        context-dependent resolution of TYPENAME_TYPEs when
        comparing_specializations.

2020-05-19  Nathan Sidwell  <nathan@acm.org>

        * pt.c (lookup_template_class_1): Do not reinit template_info of an
        alias here.

2020-05-18  Martin Sebor  <msebor@redhat.com>

        PR c++/94923
        * call.c ((maybe_warn_class_memaccess): Use is_byte_access_type.
        * cp-tree.h (is_dummy_object): Return bool.
        (is_byte_access_type): Declare new function.
        * tree.c (is_dummy_object): Return bool.
        (is_byte_access_type): Define new function.

2020-05-19  Patrick Palka  <ppalka@redhat.com>

        PR c++/87847
        * pt.c (init_template_processing): Enable sanitization for
        decl_specializations and type_specializations.

        PR c++/66439
        * pt.c (fn_type_unification): Pass 'fn' instead of NULL_TREE as
        the 'in_decl' parameter to coerce_template_parms.

2020-05-18  Marek Polacek  <polacek@redhat.com>

        PR c++/94955
        * typeck.c (cp_build_binary_op): Use fold_for_warn instead of
        cp_fold_rvalue.

2020-05-18  Marek Polacek  <polacek@redhat.com>

        PR c++/94937
        * cvt.c (cp_get_fndecl_from_callee): Return NULL_TREE if the function
        type is not INDIRECT_TYPE_P.
        * decl.c (omp_declare_variant_finalize_one): Call
        cp_get_callee_fndecl_nofold instead of looking for the function decl
        manually.

2020-05-18  Marek Polacek  <polacek@redhat.com>

        PR c++/90915
        * parser.c (cp_parser_has_attribute_expression): Sorry on a
        type-dependent argument.

2020-05-18  Marek Polacek  <polacek@redhat.com>

        DR 1512
        PR c++/87699
        * call.c (add_builtin_candidate) <case EQ_EXPR>: Create candidate
        operator functions when type is std::nullptr_t for ==/!=.
        * typeck.c (composite_pointer_type_r): Add a bool * parameter.  Use it
        to maybe add "const" to the pointer type.
        (composite_pointer_type): Update the call to composite_pointer_type_r.
        (cp_build_binary_op): Turn two warning_at into error_at.  Print the
        types.

2020-05-18  Jason Merrill  <jason@redhat.com>

        * call.c (build_over_call): Remove unnecessary
        cp_stabilize_reference.

2020-05-18  Marek Polacek  <polacek@redhat.com>

        * call.c (add_builtin_candidate): Don't create a builtin overload
        candidate for ++ when type is bool in C++17.

2020-05-18  Marek Polacek  <polacek@redhat.com>

        * cfns.h: Regenerated.

2020-05-17  Iain Sandoe  <iain@sandoe.co.uk>

        * coroutines.cc (morph_fn_to_coro): Initialize the gro variable.

2020-05-16  Iain Sandoe  <iain@sandoe.co.uk>

        * coroutines.cc (finish_co_return_stmt): Implement rules
        from [class.copy.elision] /3.

2020-05-16  Patrick Palka  <ppalka@redhat.com>

        PR c++/57943
        * semantics.c (finish_decltype_type): Call
        instantiate_non_dependent_expr_sfinae on the expression.

2020-05-15  Patrick Palka  <ppalka@redhat.com>

        Revert:

        2020-04-07  Patrick Palka  <ppalka@redhat.com>

        PR c++/90996
        * typeck2.c (process_init_constructor_array): Propagate
        CONSTRUCTOR_PLACEHOLDER_BOUNDARY up from each element initializer to
        the array initializer.

2020-05-15  Jason Merrill  <jason@redhat.com>

        PR c++/93286 - ICE with __is_constructible and variadic template.
        * pt.c (tsubst_tree_list): New.
        (tsubst, tsubst_copy_and_build): Use it.
        * decl2.c (is_late_template_attribute): Handle error_mark_node args.

2020-05-15  Nathan Sidwell  <nathan@acm.org>

        * pt.c (template_args_equal): Fix thinkos in previous 'cleanup'.

2020-05-14  Jason Merrill  <jason@redhat.com>

        PR c++/93901
        * pt.c (maybe_instantiate_noexcept): Change clone handling.

2020-05-14  Patrick Palka  <ppalka@redhat.com>

        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.

2020-05-14  Nathan Sidwell  <nathan@acm.org>

        * parser.c (cp_parser_diagnose_invalid_typename): Mention
        std=c++20 not 2a, reformat dependent binfo inform loops.

        * pt.c (tsubst_template_decl): Reorder and commonize some control
        paths.

        * pt.c (tsubst_friend_function): Simplify control flow.

        * pt.c (lookup_template_class_1): Remove unnecessary else by
        simply grabbing TYPE_NAME earlier.

        * pt.c (push_template_decl_real): Adjust friend pushing logic.
        Reinit template type.

        * pt.c (build_template_decl): Init DECL_TEMPLATE_RESULT &
        TREE_TYPE here ...
        (process_partial_specialization): ... not here ...
        (push_template_decl_real, add_inherited_template_parms)
        (build_deduction_guide): ... or here.

2020-05-14  Jakub Jelinek  <jakub@redhat.com>

        * cp-gimplify.c (cp_genericize_r): Set cfun->has_omp_target.

2020-05-13  Patrick Palka  <ppalka@redhat.com>

        PR c++/79706
        * init.c (build_vec_delete_1): Just return error_mark_node if
        deallocate_expr is error_mark_node.
        (build_delete): Just return error_mark_node if do_delete is
        error_mark_node.

2020-05-13  Patrick Palka  <ppalka@redhat.com>

        PR c++/95020
        * constraint.cc (tsubst_requires_expr): Produce a new
        requires-expression when processing_template_decl, even if
        template arguments are not dependent.

2020-05-13  Marek Polacek  <polacek@redhat.com>

        PR c++/95066
        * decl.c (duplicate_decls): Set DECL_HAS_DEPENDENT_EXPLICIT_SPEC_P.

2020-05-13  Nathan Sidwell  <nathan@acm.org>

        * pt.c (template_args_equal): Reorder category checking for
        clarity.

        * pt.c (perform_typedefs_access_check): Cache expensively
        calculated object references.
        (check_auto_in_tmpl_args): Just assert we do not get unexpected
        nodes, rather than silently do nothing.
        (append_type_to_template_for_access): Likewise, cache expensie
        object reference.

        * pt.c (canonical_type_parameter): Simplify.

        Formatting fixups & some simplifications.
        * pt.c (spec_hash_table): New typedef.
        (decl_specializations, type_specializations): Use it.
        (retrieve_specialization): Likewise.
        (register_specialization): Remove unnecessary casts.
        (push_template_decl_real): Reformat.
        (instantiate_class_template_1): Use more RAII.
        (make_argument_pack): Simplify.
        (instantiate_template_1): Use gcc_checking_assert for expensive
        asserts.
        (instantiate_decl): Likewise.
        (resolve_typename_type): Reformat comment.
        * semantics.c (struct deferred_access): Remove unnecessary GTY on
        member.
        (begin_class_definition): Fix formatting.

2020-05-13  Jason Merrill  <jason@redhat.com>

        * call.c, class.c, constexpr.c, constraint.cc, decl.c, init.c,
        lambda.c, lex.c, method.c, name-lookup.c, parser.c, pt.c, tree.c,
        typeck2.c: Change cxx2a to cxx20.

2020-05-12  Marek Polacek  <polacek@redhat.com>

        PR c++/95074
        * parser.c (cp_parser_postfix_expression) <case CPP_OPEN_PAREN>: When
        looking for a block-scope function declaration, look through the whole
        set, not just the first function in the overload set.

2020-05-12  Jakub Jelinek  <jakub@redhat.com>

        PR c++/95063
        * pt.c (tsubst_decl): Deal with DECL_OMP_PRIVATIZED_MEMBER for
        a bit-field.

2020-05-11  Jason Merrill  <jason@redhat.com>

        Resolve C++20 NB comment CA104
        * pt.c (determine_specialization): Compare constraints for
        specialization of member template of class instantiation.

2020-05-11  Jason Merrill  <jason@redhat.com>

        PR c++/92583
        PR c++/92654
        * tree.c (cp_walk_subtrees): Stop at typedefs.
        Handle TYPENAME_TYPE here.
        * pt.c (find_parameter_packs_r): Not here.
        (for_each_template_parm_r): Clear *walk_subtrees.
        * decl2.c (min_vis_r): Look through typedefs.

2020-05-11  Jason Merrill  <jason@redhat.com>

        * call.c (implicit_conversion_error): Split out from...
        (perform_implicit_conversion_flags): ...here.
        (build_converted_constant_expr_internal): Use it.

2020-05-11  Jason Merrill  <jason@redhat.com>

        PR c++/90748
        * parser.c (inject_parm_decls): Set current_class_ptr here.
        (cp_parser_direct_declarator): And here.
        (cp_parser_late_return_type_opt): Not here.
        (cp_parser_noexcept_specification_opt): Nor here.
        (cp_parser_exception_specification_opt)
        (cp_parser_late_noexcept_specifier): Remove unneeded parameters.

2020-05-11  Jason Merrill  <jason@redhat.com>

        * decl.c (cxx_init_decl_processing): Call declare_weak for
        __cxa_pure_virtual.

2020-05-11  Jason Merrill  <jason@redhat.com>

        * pt.c (instantiate_class_template_1): Call tsubst_expr for
        STATIC_ASSERT member.
        * ptree.c (cxx_print_xnode): Handle STATIC_ASSERT.

2020-05-11  Jason Merrill  <jason@redhat.com>

        * pt.c (find_parameter_packs_r) [LAMBDA_EXPR]: Remove redundant
        walking of capture list.

2020-05-11  Jason Merrill  <jason@redhat.com>

        * cp-tree.h (LOOKUP_EXPLICIT_TMPL_ARGS): Remove.
        * call.c (build_new_function_call): Don't set it.
        (build_new_method_call_1): Likewise.
        (build_over_call): Check cand->explicit_targs instead.

2020-05-11  Jason Merrill  <jason@redhat.com>

        * decl.c (compute_array_index_type_loc): Stabilize before building
        the MINUS_EXPR.

2020-05-11  Jason Merrill  <jason@redhat.com>

        * decl.c (grokdeclarator): Adjust deprecated_state here.
        (start_decl): Not here.

2020-05-08  Iain Sandoe  <iain@sandoe.co.uk>

        PR c++/95003
        * coroutines.cc (build_actor_fn): Ensure that bind scopes
        are marked as having side-effects where necessary.
        (replace_statement_captures): Likewise.
        (morph_fn_to_coro): Likewise.

2020-05-08  Nathan Sidwell  <nathan@acm.org>

        * NEWS: Delete, it is so stale.

        * parser.c (cp_lexer_set_source_position_from_token): EOF has a
        location too.

2020-05-07  Iain Sandoe  <iain@sandoe.co.uk>

        PR c++/94817
        PR c++/94829
        * coroutines.cc (morph_fn_to_coro): Set unformed outline
        functions to error_mark_node.  For early error returns suppress
        warnings about missing ramp return values.  Fix reinstatement
        of the function body on pre-existing initial error.
        * decl.c (finish_function): Use the normal error path for fails
        in the ramp function, do not try to compile the helpers if the
        transform fails.

2020-05-07  Marek Polacek  <polacek@redhat.com>

        PR c++/94590 - Detect long double -> double narrowing.
        * typeck2.c (check_narrowing): Detect long double -> double
        narrowing even when double and long double have the same
        precision.  Make it handle conversions to float too.

2020-05-07  Marek Polacek  <polacek@redhat.com>

        PR c++/94255
        * parser.c (cp_parser_class_specifier_1): Check that the scope is
        nested inside current scope before pushing it.

2020-05-07  Marek Polacek  <polacek@redhat.com>

          P1957R2
          * typeck2.c (check_narrowing): Consider T* to bool narrowing
          in C++11 and up.

2020-05-07  Marek Polacek  <polacek@redhat.com>

        * decl.c (grok_op_properties): Fix spelling of non-static.
        * typeck.c (build_class_member_access_expr): Likewise.

2020-05-07  Richard Biener  <rguenther@suse.de>

        PR middle-end/94703
        * optimize.c (update_cloned_parm): Copy DECL_NOT_GIMPLE_REG_P.

2020-05-06  Marek Polacek  <polacek@redhat.com>

        PR c++/94938
        * pt.c (tsubst_copy_and_build): Call type_dependent_expression_p_push
        instead of uses_template_parms.  Move the warning_sentinels after the
        RECURs.

2020-05-06  Jakub Jelinek  <jakub@redhat.com>

        PR c++/94951
        * typeck.c (cp_strict_aliasing_warning): New function.
        (cp_build_indirect_ref_1, build_reinterpret_cast_1): Use
        it instead of strict_aliasing_warning.

        PR c++/94907
        * method.c (defaulted_late_check): Don't call synthesize_method
        on constexpr sfk_comparison if it has been called on it already.

2020-05-06  Nathan Sidwell  <nathan@acm.org>

        PR c++/94946
        * decl.c (grokdeclarator): Don't splice template attributes in
        parm context -- they can apply to the parm.

2020-05-05  Iain Sandoe  <iain@sandoe.co.uk>

        * coroutines.cc: Remove references to n4849 throughout.

2020-05-05  Jason Merrill  <jason@redhat.com>

        CWG 2235
        * pt.c (more_specialized_fn): Do consider parms with no deducible
        template parameters.

2020-05-05  Jason Merrill  <jason@redhat.com>

        PR c++/90212
        * constexpr.c (potential_constant_expression_1): In a lambda
        function, consider a captured variable directly.

2020-05-05  Iain Sandoe  <iain@sandoe.co.uk>

        * coroutines.cc (transform_await_wrapper): Check that we have
        no unlowered co_yields.
        (captures_temporary): Likewise.
        (register_awaits): Likewise.

2020-05-05  Nathan Sidwell  <nathan@acm.org>

        PR c++/94807
        * coroutines.cc (morph_fn_to_coro): Just check for
        closure_identifier.
        * pt.c (tsubst_function_decl): Update lambda fn's this_ptr name.

2020-05-05  Marek Polacek  <polacek@redhat.com>
            Jason Merrill  <jason@redhat.com>

        PR c++/94799
        * parser.c (cp_parser_postfix_dot_deref_expression): If we have
        a type-dependent object of class type, stash it to
        parser->context->object_type.  If the postfix expression doesn't have
        a type, use typeof.
        (cp_parser_class_name): Consider object scope too.
        (cp_parser_lookup_name): Remove code dealing with the case when
        object_type is unknown_type_node.

2020-05-04  Patrick Palka  <ppalka@redhat.com>

        PR c++/94038
        * cp-gimplify.c (cp_fold) <case CALL_EXPR>: Move some variable
        declarations closer to their uses.  Copy the CALL_EXPR only
        when one of its arguments has changed.
        <case TREE_VEC>: Instead of first collecting the folded
        arguments into a releasing_vec, just make a copy of the TREE_VEC
        as soon as folding changes one of its arguments.

2020-05-04  Iain Sandoe  <iain@sandoe.co.uk>

        * coroutines.cc (morph_fn_to_coro): Mark the coro.gro variable
        as artificial and ignored.

2020-05-04  Nathan Sidwell  <nathan@acm.org>

        pt.c (process_template_parm): Don't walk the template list twice,
        remember the final node instead.
        (end_template_parm_list): Refactor.  Comment on why we do a pop
        and a push.

        PR c++/94827 -- don't save parms in nested requirement
        * constraint.cc (tsubst_nested_requirement): TYPE directly holds
        notmalized requirement.
        (finish_nested_requirement): Don't stash current tpl parms into
        the requirement.
        (diagnose_nested_requirement): TYPE directly holds notmalized
        requirement.

2020-05-01  Patrick Palka  <ppalka@redhat.com>

        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.

2020-05-01  Marek Polacek  <polacek@redhat.com>

        PR c++/94885
        * typeck2.c (process_init_constructor_record): Return PICFLAG_ERRONEOUS
        if an initializer element was erroneous.

2020-05-01  Jason Merrill  <jason@redhat.com>

        PR c++/90479
        * init.c (get_nsdmi): Don't push_to_top_level for a local class.

2020-05-01  Jason Merrill  <jason@redhat.com>

        PR c++/91529
        * decl.c (cp_finish_decl): Also clear TREE_READONLY if
        -fmerge-all-constants.

2020-05-01  Jason Merrill  <jason@redhat.com>

        PR c++/93822
        * pt.c (tsubst_decl): Make sure DECL_VALUE_EXPR continues to have
        the same type as the variable.

2020-04-30  Jason Merrill  <jason@redhat.com>
            Nathan Sidwell  <nathan@acm.org>

        PR c++/94827
        * constraint.cc (map_arguments): If ARGS is null, it's a
        self-mapping of parms.
        (finish_nested_requirement): Do not pass argified
        current_template_parms to normalization.
        (tsubst_nested_requirement): Don't assert no template parms.

2020-04-30  Iain Sandoe  <iain@sandoe.co.uk>

        PR c++/94886
        * coroutines.cc (transform_local_var_uses): Defer walking
        the DECL_INITIALs of BIND_EXPR vars until all the frame
        allocations have been made.

2020-04-30  Iain Sandoe  <iain@sandoe.co.uk>

        PR c++/94883
        * coroutines.cc (register_awaits): Update target
        expressions for awaitable and suspend handle
        initializers.

2020-04-30  Iain Sandoe  <iain@sandoe.co.uk>

        PR c++/94879
        * coroutines.cc (build_co_await): Account for variables
        with DECL_VALUE_EXPRs.
        (captures_temporary): Likewise.
        (register_awaits): Likewise.

2020-04-29  Patrick Palka  <ppalka@redhat.com>

        PR c++/94830
        * pt.c (find_template_parameter_info::parm_list): New field.
        (keep_template_parm): Use the new field to build up the
        parameter list here instead of ...
        (find_template_parameters): ... here.  Return ftpi.parm_list.

2020-04-29  Jakub Jelinek  <jakub@redhat.com>

        PR target/94707
        * class.c (build_base_field): Set DECL_FIELD_ABI_IGNORED on C++17 empty
        base artificial FIELD_DECLs.
        (layout_class_type): Set DECL_FIELD_ABI_IGNORED on empty class
        field_poverlapping_p FIELD_DECLs.

2020-04-29  Patrick Palka  <ppalka@redhat.com>

        PR c++/94819
        * constraint.cc (satisfy_declaration_constraints): Use saved_t
        instead of t as the key to decl_satisfied_cache.

        PR c++/94808
        * error.c (print_requires_expression_info): Print the dependent
        form of the parameter list with its template parameter mapping,
        rather than printing the substituted form.

2020-04-28  Jason Merrill  <jason@redhat.com>

        PR c++/94583
        * decl.c (use_eh_spec_block): Check nothrow type after
        DECL_DEFAULTED_FN.
        * pt.c (maybe_instantiate_noexcept): Call synthesize_method for
        DECL_MAYBE_DELETED fns here.
        * decl2.c (mark_used): Not here.
        * method.c (get_defaulted_eh_spec): Reject DECL_MAYBE_DELETED here.

2020-04-28  Iain Sandoe  <iain@sandoe.co.uk>

        PR c++/94760
        * coroutines.cc (instantiate_coro_traits): Pass a reference to
        object type rather than a pointer type for 'this', for method
        coroutines.
        (struct param_info): Add a field to hold that the parm is a lambda
        closure pointer.
        (morph_fn_to_coro): Check for lambda closure pointers in the
        args.  Use a reference to *this when building the args list for the
        promise allocator lookup.

2020-04-28  Iain Sandoe  <iain@sandoe.co.uk>

        PR c++/94759
        * coroutines.cc (coro_promise_type_found_p): Do not
        exclude non-classes here (this needs to be handled in the
        coroutine header).
        (morph_fn_to_coro):  Allow for the case where the coroutine
        returns void.

2020-04-27  Iain Sandoe  <iain@sandoe.co.uk>

        PR c++/94701
        * coroutines.cc (struct local_var_info): Add fields for static
        variables and those with DECL_VALUE_EXPR redirection.
        (transform_local_var_uses): Skip past typedefs and static vars
        and then account for redirected variables.
        (register_local_var_uses): Likewise.

2020-04-27  Jason Merrill  <jason@redhat.com>

        PR c++/90750
        PR c++/79585
        * decl.c (grokdeclarator): Move dependent attribute to decl.
        * decl2.c (splice_template_attributes): No longer static.

2020-04-27  Patrick Palka  <ppalka@redhat.com>

        PR c++/94772
        * constexpr.c (cxx_eval_call_expression): Don't set new_obj if we're
        evaluating the target constructor of a delegating constructor.
        (cxx_eval_store_expression): Don't set TREE_READONLY if the LHS of the
        INIT_EXPR is '*this'.

2020-04-26  Marek Polacek  <polacek@redhat.com>

        PR c++/90320
        * call.c (struct conversion): Add copy_init_p.
        (standard_conversion): Set copy_init_p in ck_base and ck_rvalue
        if FLAGS demands LOOKUP_ONLYCONVERTING.
        (convert_like_real) <case ck_base>: If copy_init_p is set, or
        LOOKUP_ONLYCONVERTING into FLAGS.

2020-04-26  Iain Sandoe  <iain@sandoe.co.uk>

        PR c++/94752
        * coroutines.cc (morph_fn_to_coro): Ensure that
        unnamed function params have a usable and distinct
        frame field name.

2020-04-24  Jason Merrill  <jason@redhat.com>

        PR c++/94583
        * decl.c (redeclaration_error_message): Reject defaulted comparison
        operator that has been previously declared.

2020-04-25  Patrick Palka  <ppalka@redhat.com>

        * parser.c (cp_parser_diagnose_invalid_type_name): Suggest enabling
        concepts if the invalid identifier is 'requires'.

2020-04-25  Jakub Jelinek  <jakub@redhat.com>

        PR c++/94742
        * semantics.c (finish_call_expr): When looking if all overloads
        are noreturn, use STRIP_TEMPLATE to look through TEMPLATE_DECLs.

2020-04-24  Martin Liska  <mliska@suse.cz>

        * coroutines.cc: Fix compilation error for release checking
        where we miss declaration of ‘coro_body_contains_bind_expr_p’.

2020-04-23  Patrick Palka  <ppalka@redhat.com>

        * tree.c (zero_init_expr_p): Use uses_template_parms instead of
        dependent_type_p.

        PR c++/94645
        * pt.c (template_class_depth): Walk into the DECL_FRIEND_CONTEXT of a
        friend declaration rather than into its CP_DECL_CONTEXT.

2020-04-23 Iain Sandoe <iain@sandoe.co.uk>

        PR c++/94288
        * coroutines.cc (await_statement_expander): Simplify cases.
        (struct susp_frame_data): Add fields for truth and/or if
        cases, rename one field.
        (analyze_expression_awaits): New.
        (expand_one_truth_if): New.
        (add_var_to_bind): New helper.
        (coro_build_add_if_not_cond_break): New helper.
        (await_statement_walker): Handle conditional expressions,
        handle expansion of truth-and/or-if cases.
        (bind_expr_find_in_subtree): New, checking-only.
        (coro_body_contains_bind_expr_p): New, checking-only.
        (morph_fn_to_coro): Ensure that we have a top level bind
        expression.

2020-04-22  Jonathan Wakely  <jwakely@redhat.com>

        PR translation/94698
        * class.c (check_field_decls): Change "define" to "declare" in
        -Weffc++ diagnostics.

2020-04-22  Patrick Palka  <ppalka@redhat.com>

        PR c++/94719
        PR c++/94549
        * constraint.cc (satisfy_declaration_constraints): If the inherited
        constructor points to an instantiation of a constructor template,
        remember and use its attached template arguments.

2020-04-22  Jonathan Wakely  <jwakely@redhat.com>

        PR translation/94698
        * class.c (check_field_decls): Change "override" to "define" in
        -Weffc++ diagnostics.

2020-04-22 Iain Sandoe <iain@sandoe.co.uk>

        PR c++/94682
        * coroutines.cc (struct param_info): Add a field to note that
        the param is 'this'.
        (morph_fn_to_coro): Convert this to a reference before using it
        in the promise parameter preview.

2020-04-22  Jason Merrill  <jason@redhat.com>

        PR c++/94546
        * pt.c (register_parameter_specializations): If the instantiation is
        still a parameter pack, don't wrap it in a NONTYPE_ARGUMENT_PACK.
        (tsubst_pack_expansion, tsubst_expr): Adjust.

2020-04-22  Martin Sebor  <msebor@redhat.com>
            Jason Merrill  <jason@redhat.com>

        PR c++/94510
        * decl.c (reshape_init_array_1): Avoid stripping redundant trailing
        zero initializers...
        * mangle.c (write_expression): ...and handle them here even for
        pointers to members by calling zero_init_expr_p.
        * cp-tree.h (zero_init_expr_p): Declare.
        * tree.c (zero_init_expr_p): Define.
        (type_initializer_zero_p): Remove.
        * pt.c (tparm_obj_values): New hash_map.
        (get_template_parm_object): Store to it.
        (tparm_object_argument): New.

2020-04-22  Patrick Palka  <ppalka@redhat.com>

        PR c++/67825
        * constraint.cc (diagnose_valid_expression): Check convert_to_void here
        as well as in tsubst_valid_expression_requirement.

2020-04-21  Patrick Palka  <ppalka@redhat.com>

        PR c++/94549
        * constraint.cc (satisfy_declaration_constraints): Don't strip the
        inherited constructor if it already has template information.

        PR c++/94597
        * pt.c (any_template_parm_r) <case IDENTIFIER_NODE>: New case.  If this
        is a conversion operator, visit its TREE_TYPE.

2020-04-21  Nathan Sidwell  <nathan@acm.org>

        * pt.c (tsubst_copy_and_build) [POINTER_PLUS_EXPR]: Check for
        error_mark_node.

2020-04-21 Iain Sandoe <iain@sandoe.co.uk>

        PR c++/94661
        * coroutines.cc (morph_fn_to_coro): Simplify return
        value computation.

2020-04-17  Marek Polacek  <polacek@redhat.com>

        PR c++/94592
        * constexpr.c (cxx_eval_outermost_constant_expr): Return when T is
        a BRACE_ENCLOSED_INITIALIZER_P.
        (is_nondependent_constant_expression): Don't check
        BRACE_ENCLOSED_INITIALIZER_P.
        (is_nondependent_static_init_expression): Likewise.

2020-04-20  Patrick Palka  <ppalka@redhat.com>

        PR c++/94628
        * cp-tree.h (lss_policy::lss_nop): New enumerator.
        * pt.c (local_specialization_stack::local_specialization_stack): Handle
        an lss_nop policy.
        (local_specialization_stack::~local_specialization_stack): Likewise.
        (tsubst_pack_expansion): Use a local_specialization_stack instead of
        manually saving and restoring local_specializations.  Conditionally
        replace local_specializations sooner, before the handling of the
        unsubstituted_packs case.

2020-04-20  Marek Polacek  <polacek@redhat.com>

        PR c++/94505 - bogus -Wparentheses warning with fold-expression.
        * pt.c (fold_expression): Add warning_sentinel for -Wparentheses
        before calling build_x_binary_op.

2020-04-20  Marek Polacek  <polacek@redhat.com>

        * coroutines.cc (captures_temporary): Don't assign the result of
        STRIP_NOPS to the same variable.

2020-04-20  Nathan Sidwell  <nathan@acm.org>

        PR c++/94454 - tpl-tpl-parms are not canonicalizable types
        * pt.c (canonical_type_parameter): Assert not a tpl-tpl-parm.
        (process_template_parm): tpl-tpl-parms are structural.
        (rewrite_template_parm): Propagate structuralness.

        PR c++/94454 - Expr pack expansion equality
        * tree.c (cp_tree_equal) [TEMPLATE_ID_EXPR, default]: Refactor.
        [EXPR_PACK_EXPANSION]: Add.

        PR c++/94454 Template Argument Hashing
        * pt.c (iterative_hash_template_arg): Strip nodes as
        template_args_equal does.
        [ARGUMENT_PACK_SELECT, TREE_VEC, CONSTRUCTOR]: Refactor.
        [node_class:TEMPLATE_TEMPLATE_PARM]: Hash by level & index.
        [node_class:default]: Refactor.

2020-04-18  Patrick Palka  <ppalka@redhat.com>

        PR c++/94632
        * tree.c (cp_tree_equal) <case PARM_DECL>: Ignore
        comparing_specializations if the parameters' contexts are identical.

        PR c++/92187
        * pt.c (splice_late_return_type): Propagate cv-qualifiers and
        PLACEHOLDER_TYPE_CONSTRAINTS from the original auto node to the new one.

2020-04-17  Patrick Palka  <ppalka@redhat.com>

        PR c++/94483
        * lambda.c (lambda_capture_field_type): Avoid doing auto deduction if
        the explicit initializer has parameter packs.

        PR c++/88754
        * parser.c (cp_parser_check_template_parameters): Before issuing a hard
        error, first try simulating an error instead.

2020-04-17  Jakub Jelinek  <jakub@redhat.com>

        PR other/94629
        * call.c (build_conditional_expr_1): Remove redundant assignment to
        arg2.

2020-04-16  Patrick Palka  <ppalka@redhat.com>

        PR c++/94475
        * cvt.c (ocp_convert): If the result of scalar_constant_value is
        erroneous, ignore it and use the original expression.

2020-04-16  Jakub Jelinek  <jakub@redhat.com>

        PR c++/94571
        * parser.c (cp_parser_simple_declaration): Fix up a pasto in
        diagnostics.

2020-04-15  Jakub Jelinek  <jakub@redhat.com>

        PR c/94593
        * parser.c (cp_parser_pragma) <case PRAGMA_OMP_REQUIRES>: Reject
        requires directive when not at file or namespace scope.

2020-04-14  Iain Sandoe  <iain@sandoe.co.uk>

        PR c++/94359
        * coroutines.cc (build_actor_fn): Check that the target can
        support the resume tailcall before mandating it.

2020-04-14  Patrick Palka  <ppalka@redhat.com>

        PR c++/85278
        * cxx-pretty-print.c (cxx_pretty_printer:simple_type_specifier)
        <case DECLTYPE_TYPE>: Handle DECLTYPE_TYPE here instead of ...
        (pp_cxx_type_specifier_seq) <case DECLTYPE_TYPE>: ... here.
        (cxx_pretty_printer::direct_abstract_declarator) <case DECLTYPE_TYPE>:
        New no-op case.

        PR c++/94034
        * constexpr.c (replace_result_decl_data): New struct.
        (replace_result_decl_data_r): New function.
        (replace_result_decl): New function.
        (cxx_eval_call_expression): Use it.
        * tree.c (build_aggr_init_expr): Set the location of the AGGR_INIT_EXPR
        to that of its initializer.

2020-04-13  Marek Polacek  <polacek@redhat.com>

        PR c++/94588
        * name-lookup.c (check_local_shadow): Add an inform call.

2020-04-13  Patrick Palka  <ppalka@redhat.com>

        PR c++/94521
        * error.c (dump_scope): Pass TFF_NO_FUNCTION_ARGUMENTS to
        dump_function_decl when printing a function template instantiation as a
        scope.

        PR c++/94470
        * constexpr.c (get_or_insert_ctor_field): Set default value of parameter
        'pos_hint' to -1.
        (cxx_eval_bare_aggregate): Use get_or_insert_ctor_field instead of
        assuming the the next index belongs at the end of the new CONSTRUCTOR.
        (cxx_eval_store_expression): Revert PR c++/78572 fix.

2020-04-13  Nathan Sidwell  <nathan@acm.org>

        PR c++/94426  lambdas with internal linkage are different to no-linkage
        * decl2.c (determine_visibility): A lambda's visibility is
        affected by its extra scope.
        * pt.c (instantiate_decl): Determine var's visibility before
        instantiating its initializer.
        * tree.c (no_linkage_check): Revert code looking at visibility of
        lambda's extra scope.
`
2020-04-10  Iain Sandoe  <iain@sandoe.co.uk>

        PR c++/94528
        * coroutines.cc (co_await_expander): Remove.
        (expand_one_await_expression): New.
        (process_one_statement): New.
        (await_statement_expander): New.
        (build_actor_fn): Revise to use per-statement expander.
        (struct susp_frame_data): Reorder and comment.
        (register_awaits): Factor code.
        (replace_statement_captures): New, factored from...
        (maybe_promote_captured_temps):.. here.
        (await_statement_walker): Revise to process per statement.
        (morph_fn_to_coro): Use revised susp_frame_data layout.

2020-04-10  Marek Polacek  <polacek@redhat.com>

        PR c++/94149
        * method.c (constructible_expr): In C++20, try using parenthesized
        initialization of aggregates to determine the result of
        __is_constructible.

2020-04-10  Bin Cheng  <bin.cheng@linux.alibaba.com>

        * coroutines.cc (co_await_expander): Simplify.

2020-04-09  Jason Merrill  <jason@redhat.com>

        PR c++/94523
        * constexpr.c (cxx_eval_constant_expression) [VAR_DECL]: Look at
        ctx->object and ctx->global->values first.

2020-04-09  Marek Polacek  <polacek@redhat.com>

        PR c++/93790
        * call.c (initialize_reference): If the reference binding failed, maybe
        try initializing from { }.
        * decl.c (grok_reference_init): For T& t(e), set
        LOOKUP_AGGREGATE_PAREN_INIT but don't build up a constructor yet.

2020-04-08  Iain Sandoe  <iain@sandoe.co.uk>
            Jun Ma  <JunMa@linux.alibaba.com>

        * coroutines.cc (maybe_promote_captured_temps): Add a cleanup
        expression, if needed, to any call from which we promoted
        temporaries captured by reference.

2020-04-08  Marek Polacek  <polacek@redhat.com>

        PR c++/94507 - ICE-on-invalid with lambda template.
        * pt.c (tsubst_lambda_expr): Cope when tsubst_template_decl or
        tsubst_function_decl returns error_mark_node.

2020-04-08  Martin Liska  <mliska@suse.cz>

        PR c++/94314
        * decl.c (duplicate_decls): Duplicate also DECL_IS_REPLACEABLE_OPERATOR.
        (cxx_init_decl_processing): Mark replaceable all implicitly defined
        operators.

2020-04-08  Patrick Palka  <ppalka@redhat.com>

        Core issues 1001 and 1322
        PR c++/92010
        * pt.c (rebuild_function_or_method_type): Split function out from ...
        (tsubst_function_type): ... here.
        (maybe_rebuild_function_decl_type): New function.
        (tsubst_function_decl): Use it.

2020-04-08  Jakub Jelinek  <jakub@redhat.com>

        PR c++/94325
        * decl.c (begin_destructor_body): For CLASSTYPE_VBASECLASSES class
        dtors, if CLASSTYPE_PRIMARY_BINFO is non-NULL, but not BINFO_VIRTUAL_P,
        look at CLASSTYPE_PRIMARY_BINFO of its BINFO_TYPE if it is not
        BINFO_VIRTUAL_P, and so on.

2020-04-08  Marek Polacek  <polacek@redhat.com>

        PR c++/94478 - ICE with defaulted comparison operator
        * method.c (early_check_defaulted_comparison): Give an error when the
        context is null.

2020-04-08  Tobias Burnus  <tobias@codesourcery.com>

        PR middle-end/94120
        * paser.c (cp_parser_oacc_declare): Add check that variables
        are declared in the same scope as the directive.

2020-04-07  Jason Merrill  <jason@redhat.com>

        PR c++/94480
        * parser.c (cp_parser_requires_expression): Use tentative_firewall.

        PR c++/94481
        * parser.c (cp_parser_placeholder_type_specifier): Use
        matching_parens.

2020-04-07  Iain Sandoe  <iain@sandoe.co.uk>

        * coroutines.cc (maybe_promote_captured_temps): Ensure that
        reference capture placeholder vars are properly declared.

2020-04-07  Patrick Palka  <ppalka@redhat.com>

        PR c++/90996
        * tree.c (replace_placeholders): Look through all handled components,
        not just COMPONENT_REFs.
        * typeck2.c (process_init_constructor_array): Propagate
        CONSTRUCTOR_PLACEHOLDER_BOUNDARY up from each element initializer to
        the array initializer.

2020-04-07  Jakub Jelinek  <jakub@redhat.com>

        PR c++/94512
        * parser.c (cp_parser_omp_parallel): Set OMP_PARALLEL_COMBINED
        if cp_parser_omp_master succeeded.

2020-04-06  Jason Merrill  <jason@redhat.com>

        PR c++/94462
        * decl.c (duplicate_decls): Fix handling of DECL_HIDDEN_FRIEND_P.

2020-04-04  Marek Polacek  <polacek@redhat.com>
            Jason Merrill  <jason@redhat.com>

        PR c++/94155 - crash in gimplifier with paren init of aggregates.
        * init.c (build_vec_init): Fill in indexes.

2020-04-04  Jason Merrill  <jason@redhat.com>

        PR c++/91377
        * mangle.c (write_expression): Skip IMPLICIT_CONV_EXPR.

2020-04-04  Patrick Palka  <ppalka@redhat.com>

        PR c++/94205
        PR c++/79937
        * constexpr.c (struct constexpr_ctx): New field 'parent'.
        (cxx_eval_bare_aggregate): Propagate CONSTRUCTOR_PLACEHOLDER_BOUNDARY
        flag from the original constructor to the reduced constructor.
        (lookup_placeholder): Prefer to return the outermost matching object
        by recursively calling lookup_placeholder on the 'parent' context,
        but don't cross CONSTRUCTOR_PLACEHOLDER_BOUNDARY constructors.
        (cxx_eval_constant_expression): Link the 'ctx' context to the 'new_ctx'
        context via 'new_ctx.parent' when being expanded without an explicit
        target.  Don't call replace_placeholders.
        (cxx_eval_outermost_constant_expr): Initialize 'ctx.parent' to NULL.

        PR c++/94219
        PR c++/94205
        * constexpr.c (get_or_insert_ctor_field): Split out (while adding
        support for VECTOR_TYPEs, and optimizations for the common case)
        from ...
        (cxx_eval_store_expression): ... here.  Rename local variable
        'changed_active_union_member_p' to 'activated_union_member_p'.  Record
        the sequence of indexes into 'indexes' that yields the subobject we're
        assigning to.  Record the integer offsets of the constructor indexes
        we're assigning through into 'index_pos_hints'.  After evaluating the
        initializer of the store expression, recompute 'valp' using 'indexes'
        and using 'index_pos_hints' as hints.
        (cxx_eval_bare_aggregate): Tweak comments.  Use get_or_insert_ctor_field
        to recompute the constructor_elt pointer we're assigning through after
        evaluating each initializer.

2020-04-04  Jason Merrill  <jason@redhat.com>

        PR c++/67825
        * constraint.cc (tsubst_valid_expression_requirement): Call
        convert_to_void.

2020-04-04  Jason Merrill  <jason@redhat.com>

        PR c++/94453
        * constexpr.c (maybe_constant_value): Use break_out_target_exprs.
        * expr.c (mark_use) [VIEW_CONVERT_EXPR]: Don't wrap a TARGET_EXPR in
        NON_LVALUE_EXPR.

2020-04-04  Jakub Jelinek  <jakub@redhat.com>

        PR debug/94441
        * parser.c (cp_parser_omp_for_loop): Use
        protected_set_expr_location_if_unset.
        * cp-gimplify.c (genericize_if_stmt, genericize_cp_loop): Likewise.

        PR c++/94477
        * pt.c (tsubst_expr) <case OMP_MASTER>: Clear
        omp_parallel_combined_clauses.

2020-04-03  Jason Merrill  <jason@redhat.com>

        PR c++/91966
        * pt.c (complex_pack_expansion_r): New.
        (complex_alias_template_p): Use it.

2020-03-31  Jason Merrill  <jason@redhat.com>

        PR c++/94205
        * constexpr.c (cxx_eval_constant_expression) [TARGET_EXPR]: Call
        replace_placeholders.
        * typeck2.c (store_init_value): Fix arguments to
        fold_non_dependent_expr.

2020-03-31  Jason Merrill  <jason@redhat.com>

        * constexpr.c (cxx_eval_constant_expression) [TARGET_EXPR]: Use
        local variables.

2020-03-30  Jason Merrill  <jason@redhat.com>

        PR c++/90711
        * tree.c (cp_tree_equal) [CALL_EXPR]: Compare KOENIG_LOOKUP_P.
        (called_fns_equal): Check DECL_CONTEXT.

2020-03-30  Jakub Jelinek  <jakub@redhat.com>

        PR c++/94385
        * semantics.c (add_stmt): Only set STMT_IS_FULL_EXPR_P on trees with
        STATEMENT_CODE_P code.

2020-03-28  Patrick Palka  <ppalka@redhat.com>

        PR c++/94306
        * parser.c (cp_parser_requires_clause_opt): Diagnose and recover from
        "requires {" when "requires requires {" was probably intended.

        PR c++/94252
        * constraint.cc (tsubst_compound_requirement): Always suppress errors
        from type_deducible_p and expression_convertible_p, as they're not
        substitution errors.
        (diagnose_atomic_constraint) <case INTEGER_CST>: Remove this case so
        that we diagnose INTEGER_CST expressions of non-bool type via the
        default case.
        * cp-gimplify.c (cp_genericize_r) <case REQUIRES_EXPR>: New case.
        * parser.c (cp_parser_requires_expression): Always parse the requirement
        body as if we're processing a template, by temporarily incrementing
        processing_template_decl.  Afterwards, if we're not actually in a
        template context, perform semantic processing to diagnose any invalid
        types and expressions.
        * pt.c (tsubst_copy_and_build) <case REQUIRES_EXPR>: Remove dead code.
        * semantics.c (finish_static_assert): Explain an assertion failure
        when the condition is a REQUIRES_EXPR like we do when it is a concept
        check.

        * constraint.cc (diagnose_compound_requirement): When diagnosing a
        compound requirement, maybe replay the satisfaction failure, subject to
        the current diagnosis depth.

        * constraint.cc (finish_constraint_binary_op): Set the location of EXPR
        as well as its range, because build_x_binary_op doesn't always do so.
        (current_constraint_diagnosis_depth): New.
        (concepts_diagnostics_max_depth_exceeded_p): New.
        (collect_operands_of_disjunction): New.
        (satisfy_disjunction): When diagnosing a satisfaction failure, maybe
        replay each branch of the disjunction, subject to the current diagnosis
        depth.
        (diagnose_valid_expression): When diagnosing a satisfaction failure,
        maybe replay the substitution error, subject to the current diagnosis
        recursion.
        (diagnose_valid_type): Likewise.
        (diagnose_nested_requiremnet): Likewise.
        (diagnosing_failed_constraint::diagnosing_failed_constraint): Increment
        current_constraint_diagnosis_depth when diagnosing.
        (diagnosing_failed_constraint::~diagnosing_failed_constraint): Decrement
        current_constraint_diagnosis_depth when diagnosing.
        (diagnosing_failed_constraint::replay_errors_p): New static member
        function.
        (diagnose_constraints): Don't diagnose if concepts_diagnostics_max_depth
        is 0.  Emit a one-off note to increase -fconcepts-diagnostics-depth if
        the limit was exceeded.
        * cp-tree.h (diagnosing_failed_constraint::replay_errors_p): Declare.

2020-03-27  Nathan Sidwell  <nathan@acm.org>

        PR c++/84733
        * name-lookup.c (do_pushdecl): Look through cleanp levels.

2020-03-27  Martin Sebor  <msebor@redhat.com>

        PR c++/94078
        PR c++/93824
        PR c++/93810
        * cp-tree.h (most_specialized_partial_spec): Declare.
        * parser.c (cp_parser_elaborated_type_specifier): Distinguish alias
        from declarations.
        (specialization_of): New function.
        (cp_parser_check_class_key): Move code...
        (class_decl_loc_t::add): ...to here.  Add parameters.  Avoid issuing
        -Wredundant-tags on first-time declarations in other declarators.
        Correct handling of template specializations.
        (class_decl_loc_t::diag_mismatched_tags): Also expect to be called
        when -Wredundant-tags is enabled.  Use primary template or partial
        specialization as the guide for uses of implicit instantiations.
        * pt.c (most_specialized_partial_spec): Declare extern.

2020-03-27  Nathan Sidwell  <nathan@acm.org>

        PR c++/94257
        * name-lookup.c (push_namespace): Triage ambiguous lookups that
        contain namespaces.

2020-03-27  Jakub Jelinek  <jakub@redhat.com>

        PR c++/94326
        * call.c (set_flags_from_callee): Don't update
        cp_function_chain->can_throw or current_function_returns_abnormally
        if cp_unevaluated_operand.

        PR c++/94339
        * cvt.c (ocp_convert): Handle COMPOUND_EXPR by recursion on the second
        operand and creating a new COMPOUND_EXPR if anything changed.

2020-03-26  Marek Polacek  <polacek@redhat.com>

        PR c++/94336 - template keyword accepted before destructor names.
        * parser.c (cp_parser_unqualified_id): Give an error when 'template'
        is followed by a destructor name.

2020-03-27  Patrick Palka  <ppalka@redhat.com>

        * decl.c (compute_array_index_type_loc): Remove redundant
        type_dependent_expression_p check that is subsumed by
        value_dependent_expression_p.
        * decl2.c (is_late_template_attribute): Likewise.
        * pt.c (uses_template_parms): Likewise.
        (dependent_template_arg_p): Likewise.

2020-03-26  Marek Polacek  <polacek@redhat.com>

        DR 1710
        PR c++/94057 - template keyword in a typename-specifier.
        * parser.c (check_template_keyword_in_nested_name_spec): New.
        (cp_parser_nested_name_specifier_opt): Implement DR1710, optional
        'template'.  Call check_template_keyword_in_nested_name_spec.
        (cp_parser_simple_type_specifier): Assume that a <
        following a qualified-id in a typename-specifier begins
        a template argument list.

2020-03-26  Iain Sandoe  <iain@sandoe.co.uk>

        * coroutines.cc (coro_init_identifiers): Initialize an identifier
        for the cororoutine handle 'address' method name.
        (struct coro_aw_data): Add fields to cover the continuations.
        (co_await_expander): Determine the kind of await_suspend in use.
        If we have the case that returns a continuation handle, then save
        this and make the target for 'scope exit without cleanup' be the
        continuation resume label.
        (expand_co_awaits): Remove.
        (struct suspend_point_info): Remove fields that kept the returned
        await_suspend handle type.
        (transform_await_expr): Remove code tracking continuation handles.
        (build_actor_fn): Add the continuation handle as an actor-function
        scope var.  Build the symmetric transfer continuation point. Call
        the tree walk for co_await expansion directly, rather than via a 
        trivial shim function.
        (register_await_info): Remove fields tracking continuation handles.
        (get_await_suspend_return_type): Remove.
        (register_awaits): Remove code tracking continuation handles.
        (morph_fn_to_coro): Remove code tracking continuation handles.

2020-03-26  Iain Sandoe  <iain@sandoe.co.uk>

        * coroutines.cc (co_await_expander): If we are expanding the
        initial await expression, set a boolean flag to show that we
        have now reached the initial await_resume() method call.
        (expand_co_awaits): Handle the 'initial await resume called' flag.
        (build_actor_fn): Insert the initial await expression into the
        start of the user-authored function-body. Handle the 'initial await
        resume called' flag.
        (morph_fn_to_coro): Initialise the 'initial await resume called'
        flag.  Modify the unhandled exception catch clause to recognise
        exceptions that occur before the initial await_resume() and re-
        throw them.

2020-03-26  Jakub Jelinek  <jakub@redhat.com>

        PR c++/81349
        * class.c (user_provided_p): Use STRIP_TEMPLATE instead of returning
        true for all TEMPLATE_DECLs.

        PR c++/94272
        * cp-gimplify.c (cp_genericize_r): Handle STATEMENT_LIST.

2020-03-25  Patrick Palka  <ppalka@redhat.com>

        PR c++/94265
        * parser.c (cp_parser_selection_statement) <case RID_IF>: Invalidate the
        current condition chain when the if-statement has a non-empty
        init-statement.

2020-03-25  Iain Sandoe  <iain@sandoe.co.uk>

        PR c++/94319
        * coroutines.cc (captures_temporary): Fix a missing dereference.

2020-03-24  Marek Polacek  <polacek@redhat.com>

        PR c++/94190 - wrong no post-decrement operator error in template.
        * call.c (convert_like_real): Use convert_from_reference on the result.

2020-03-24  Jason Merrill  <jason@redhat.com>

        PR c++/94186
        * constraint.cc (constraint_satisfaction_value): Repeat noisily on
        error.
        (tsubst_nested_requirement): Likewise.
        (get_constraint_error_location): Allow missing context.
        (diagnose_atomic_constraint): Diagnose non-bool constraint here.
        (satisfy_atom): Not here.  Only diagnose non-constant when noisy.

2020-03-24  Jason Merrill  <jason@redhat.com>

        * pt.c (any_template_parm_r): Look into the type of a non-type
        template parm.

2020-03-24  Jason Merrill  <jason@redhat.com>

        * cp-tree.h (cp_expr): When constructing from an expr and a
        location, call protected_set_expr_location.

2020-03-23  Patrick Palka  <ppalka@redhat.com>

        PR c++/93805
        * except.c (maybe_noexcept_warning): Add TODO.
        * method.c (walk_field_subobs): Pass tf_none to expr_noexcept_p.

2020-03-23  nathans  <nathan@acm.org>

        PR c++/94044
        * tree.c (cp_tree_equal) [SIZEOF_EXPR]: Detect argument pack
        operand.

2020-03-21  Patrick Palka  <ppalka@redhat.com>

        PR c++/94066
        * constexpr.c (reduced_constant_expression_p) [CONSTRUCTOR]: Properly
        handle unions without an initializer.
        (cxx_eval_component_reference): Emit a different diagnostic when the
        constructor element corresponding to a union member is NULL.
        (cxx_eval_bare_aggregate): When constructing a union, always set the
        active union member before evaluating the initializer.  Relax assertion
        that verifies the index of the constructor element we're initializing
        hasn't been changed.
        (cxx_eval_store_expression): Diagnose changing the active union member
        while the union is in the process of being initialized.  After setting
        an active union member, clear CONSTRUCTOR_NO_CLEARING on the underlying
        CONSTRUCTOR.
        (cxx_eval_constant_expression) [PLACEHOLDER_EXPR]: Don't re-reduce a
        CONSTRUCTOR returned by lookup_placeholder.

2020-03-20  Patrick Palka  <ppalka@redhat.com>

        * cxx-pretty-print.c (pp_cxx_parameter_mapping): Make extern.  Move
        the "[with ]" bits to here from ...
        (pp_cxx_atomic_constraint): ... here.
        * cxx-pretty-print.h (pp_cxx_parameter_mapping): Declare.
        * error.c (rebuild_concept_check): Delete.
        (print_concept_check_info): Print the dependent form of the constraint and the
        preferably substituted parameter mapping alongside it.

2020-03-19  Jason Merrill  <jason@redhat.com>

        PR c++/94175
        * cp-gimplify.c (simple_empty_class_p): Look through
        SIMPLE_TARGET_EXPR_P.
        (cp_gimplify_expr) [MODIFY_EXPR]: Likewise.
        [RETURN_EXPR]: Avoid producing 'return *retval;'.
        * call.c (build_call_a): Strip TARGET_EXPR from empty class arg.
        * cp-tree.h (SIMPLE_TARGET_EXPR_P): Check that TARGET_EXPR_INITIAL
        is non-null.

2020-03-19  Jakub Jelinek  <jakub@redhat.com>

        PR c++/93931
        * parser.c (cp_parser_omp_var_list_no_open): Call process_outer_var_ref
        on outer_automatic_var_p decls.
        * cp-gimplify.c (cxx_omp_disregard_value_expr): Return true also for
        capture proxy decls.

2020-03-18  Nathan Sidwell  <nathan@acm.org>

        PR c++/94147 - mangling of lambdas assigned to globals
        * parser.c (cp_parser_init_declarator): Namespace-scope variables
        provide a lambda scope.
        * tree.c (no_linkage_check): Lambdas with a variable for extra
        scope have a linkage from the variable.

2020-03-18  Jakub Jelinek  <jakub@redhat.com>

        * constraint.cc (resolve_function_concept_check, subsumes_constraints,
        strictly_subsumes): Fix up duplicated word issue in a comment.
        * coroutines.cc (build_init_or_final_await, captures_temporary):
        Likewise.
        * logic.cc (dnf_size_r, cnf_size_r): Likewise.
        * pt.c (append_type_to_template_for_access_check): Likewise.

        PR c++/91759
        * decl.c (grokfndecl): Restore old diagnostics about deduction
        guide declared in different scope if in_namespace is NULL_TREE.

2020-03-17  Jakub Jelinek  <jakub@redhat.com>

        PR c++/90995
        * parser.c (cp_parser_enum_specifier): Use temp_override for
        parser->colon_corrects_to_scope_p, replace goto out with return.
        If scoped enum or enum with underlying type is not followed by
        { or ;, call cp_parser_commit_to_tentative_parse before calling
        cp_parser_error and make sure to return error_mark_node instead of
        NULL_TREE.  Formatting fixes.

2020-03-17  Ville Voutilainen  <ville.voutilainen@gmail.com>

        PR c++/94197
        * method.c (assignable_expr): Use cp_unevaluated.
        (is_xible_helper): Push a non-deferred access check for
        the stub objects created by assignable_expr and constructible_expr.

2020-03-17  Jakub Jelinek  <jakub@redhat.com>

        * pt.c (tsubst): Fix up duplicated word issue in a diagnostic message.
        (lookup_template_class_1, tsubst_expr): Fix up duplicated word issue
        in a comment.
        * parser.c (cp_parser_statement, cp_parser_linkage_specification,
        cp_parser_placeholder_type_specifier,
        cp_parser_constraint_requires_parens): Likewise.
        * name-lookup.c (suggest_alternative_in_explicit_scope): Likewise.

2020-03-15  Iain Sandoe  <iain@sandoe.co.uk>

        * coroutines.cc (co_await_expander): Fix indentation.

2020-03-14  Jason Merrill  <jason@redhat.com>

        PR c++/92068
        * pt.c (process_partial_specialization): Error rather than crash on
        extra pack expansion.

2020-03-14  Jason Merrill  <jason@redhat.com>

        PR c++/92909
        * pt.c (find_parameter_packs_r): [DECL_EXPR]: Walk
        DECL_ORIGINAL_TYPE of a typedef.

2020-03-14  Jason Merrill  <jason@redhat.com>

        PR c++/93248
        * pt.c (build_deduction_guide): Clear cp_unevaluated_operand for
        substituting DECL_ARGUMENTS.

2020-03-14  Jakub Jelinek  <jakub@redhat.com>

        * logic.cc (formula::formula): Change "a an" to "an" in a comment.
        * parser.c (cp_debug_parser): Change "a an" to "an" in a string
        literal.

2020-03-13  Patrick Palka  <ppalka@redhat.com>

        PR c++/67960
        * call.c (build_over_call): Use a warning_sentinel to disable
        warn_deprecated_decl before calling build_addr_func.

2020-03-12  Jakub Jelinek  <jakub@redhat.com>

        PR c++/94124
        * decl.c (reshape_init_array_1): Don't unshare constructor if there
        aren't any trailing zero elts, otherwise only unshare the first
        nelts.

2020-03-11  Jason Merrill  <jason@redhat.com>

        PR c++/93907
        * constraint.cc (tsubst_parameter_mapping): Canonicalize type
        argument.

2020-03-11  Marek Polacek  <polacek@redhat.com>
            Jason Merrill  <jason@redhat.com>

        PR c++/94074 - wrong modifying const object error for COMPONENT_REF.
        * constexpr.c (cref_has_const_field): New function.
        (modifying_const_object_p): Consider a COMPONENT_REF
        const only if any of its fields are const.
        (cxx_eval_store_expression): Mark a CONSTRUCTOR of a const type
        as readonly after its initialization has been done.

2020-03-10  Marek Polacek  <polacek@redhat.com>

        PR c++/94124 - wrong conversion error with non-viable overload.
        * decl.c (reshape_init_array_1): Unshare a constructor if we
        stripped trailing zero-initializers.

2020-03-10  Jason Merrill  <jason@redhat.com>

        PR c++/93901
        * pt.c (maybe_instantiate_noexcept): Always update clones.

2020-03-10  Jason Merrill  <jason@redhat.com>

        PR c++/93596
        * pt.c (maybe_aggr_guide): Check BRACE_ENCLOSED_INITIALIZER_P.

2020-03-10  Jason Merrill  <jason@redhat.com>

        PR c++/93922
        PR c++/94041
        PR c++/52320
        PR c++/66139
        * cp-gimplify.c (cp_gimplify_init_expr): Partially revert patch for
        66139: Don't split_nonconstant_init.  Remove pre_p parameter.

2020-03-09  Marek Polacek  <polacek@redhat.com>

        PR c++/92031 - bogus taking address of rvalue error.
        PR c++/91465 - ICE with template codes in check_narrowing.
        PR c++/93870 - wrong error when converting template non-type arg.
        PR c++/94068 - ICE with template codes in check_narrowing.
        * call.c (convert_like_real): Return IMPLICIT_CONV_EXPR
        in a template when not ck_identity and we're dealing with a class.
        (convert_like_real) <case ck_ref_bind>: Return IMPLICIT_CONV_EXPR
        in a template if we need a temporary.
        * decl.c (compute_array_index_type_loc): Remove
        instantiate_non_dependent_expr_sfinae call.  Call
        fold_non_dependent_expr instead of maybe_constant_value.
        (build_explicit_specifier): Don't instantiate or create a sentinel
        before converting the expression.
        * except.c (build_noexcept_spec): Likewise.
        * pt.c (convert_nontype_argument): Don't build IMPLICIT_CONV_EXPR.
        Set IMPLICIT_CONV_EXPR_NONTYPE_ARG if that's what
        build_converted_constant_expr returned.
        * typeck2.c (check_narrowing): Call fold_non_dependent_expr instead
        of maybe_constant_value.

2020-03-09  Jakub Jelinek  <jakub@redhat.com>

        PR c++/94067
        Revert
        2019-10-11  Paolo Carlini  <paolo.carlini@oracle.com>

        * constexpr.c (cxx_eval_constant_expression): Do not handle
        RROTATE_EXPR and LROTATE_EXPR.

2020-03-09  Marek Polacek  <polacek@redhat.com>

        PR c++/94050 - ABI issue with alignas on armv7hl.
        * class.c (layout_class_type): Don't replace a class's
        CLASSTYPE_AS_BASE if their TYPE_USER_ALIGN don't match.

2020-03-09  Bin Cheng  <bin.cheng@linux.alibaba.com>

        * coroutines.cc (build_actor_fn): Factor out code inserting the
        default return_void call to...
        (morph_fn_to_coro): ...here, also hoist local var declarations.

2020-03-08  Patrick Palka  <ppalka@redhat.com>

        PR c++/93729
        * call.c (convert_like_real): Check complain before emitting an error
        about binding a bit-field to a reference.

        * cxx-pretty-print.c (cxx_pretty_printer::simple_type_specifier)
        [TYPENAME_TYPE]: Print the TYPENAME_TYPE_FULLNAME instead of the
        TYPE_NAME.

2020-03-06  Nathan Sidwell  <nathan@acm.org>

        PR c++/94027
        * mangle.c (find_substitution): Don't call same_type_p on template
        args that cannot match.

2020-03-04  Martin Sebor  <msebor@redhat.com>

        PR c++/90938
        * tree.c (type_initializer_zero_p): Fail for structs initialized
        with non-structs.

2020-03-04  Jason Merrill  <jason@redhat.com>

        PR c++/90432
        * init.c (perform_member_init): Don't do aggregate initialization of
        empty field.
        * constexpr.c (cx_check_missing_mem_inits): Don't enforce
        initialization of empty field.

2020-03-04  Martin Liska  <mliska@suse.cz>

        * method.c: Wrap array in ctor with braces in order
        to silent clang warnings.

2020-03-03  Jason Merrill  <jason@redhat.com>
            Marek Polacek  <polacek@redhat.com>

        PR c++/90505 - mismatch in template argument deduction.
        * pt.c (tsubst): Don't reduce the template level of template
        parameters when tf_partial.

2020-03-03  Jakub Jelinek  <jakub@redhat.com>

        PR c++/93998
        * constexpr.c (cxx_eval_constant_expression)
        <case TARGET_EXPR, case SAVE_EXPR>: Don't record anything if
        *non_constant_p is true.

2020-03-03  Jun Ma  <JunMa@linux.alibaba.com>

        * coroutines.cc (captures_temporary): Strip component_ref
        to its base object.

2020-03-03  Jun Ma  <JunMa@linux.alibaba.com>

        * coroutines.cc (finish_co_await_expr): Build co_await_expr
        with unknown_type_node.
        (finish_co_yield_expr): Ditto.
        *pt.c (type_dependent_expression_p): Set co_await/yield_expr
        with unknown type as dependent.

2020-03-02  Iain Sandoe  <iain@sandoe.co.uk>

        * coroutines.cc (struct local_var_info): Adjust to remove the
        reference to the captured var, and just to note that this is a
        lambda capture proxy.
        (transform_local_var_uses): Handle lambda captures specially.
        (struct param_frame_data): Add a visited set.
        (register_param_uses): Also check for param uses in lambda
        capture proxies.
        (struct local_vars_frame_data): Remove captures list.
        (register_local_var_uses): Handle lambda capture proxies by
        noting and bypassing them.
        (morph_fn_to_coro): Update to remove lifetime extension of
        lambda capture-by-copy vars.

2020-03-02  Iain Sandoe  <iain@sandoe.co.uk>

        * coroutines.cc (build_co_await): Do not build frame
        awaitable proxy vars when the co_await expression is
        a function parameter or local var.
        (co_await_expander): Do not initialise a frame var with
        itself.
        (transform_await_expr): Only substitute the awaitable
        frame var if it's needed.
        (register_awaits): Do not make frame copies for param
        or local vars that are awaitables.

2020-02-28  Jason Merrill  <jason@redhat.com>

        Implement P2092R0, Disambiguating Nested-Requirements
        * parser.c (cp_parser_requirement_parameter_list): Pass
        CP_PARSER_FLAGS_TYPENAME_OPTIONAL.

        * call.c (build_user_type_conversion_1): Don't look at the second
        conversion of a non-viable candidate.

2020-02-28  Jakub Jelinek  <jakub@redhat.com>

        P1937R2 - Fixing inconsistencies between const{expr,eval} functions
        * typeck.c (cp_build_addr_expr_1): Allow taking address of immediate
        functions in unevaluated contexts.

2020-02-27  Nathan Sidwell  <nathan@acm.org>

        PR c++/93933
        * pt.c (template_args_equal): Pass ARGUMENT_PACKS through to
        cp_tree_equal.
        * tree.c (cp_tree_equal): Compare ARGUMENT_PACKS here,
        * typeck.c (comptypes): Assert we don't get any argument packs.

        * class.c (adjust_clone_args): Correct arg-checking assert.
        * typeck.c (comptypes): Assert not nulls.

2020-02-26  Marek Polacek  <polacek@redhat.com>

        PR c++/93789 - ICE with invalid array bounds.
        * decl.c (compute_array_index_type_loc): Don't use the folded
        size when folding cleared TREE_CONSTANT.

2020-02-26  Iain Sandoe  <iain@sandoe.co.uk>

        * class.c (classtype_has_non_deleted_copy_ctor): New.
        * coroutines.cc (struct param_info): Keep track of params
        that are references, and cache the original type and whether
        the DTOR is trivial.
        (build_actor_fn): Handle param copies always, and adjust the
        handling for references.
        (register_param_uses): Only handle uses here.
        (classtype_has_non_deleted_copy_ctor): New.
        (morph_fn_to_coro): Adjust param copy handling to match n4849
        by reordering ahead of the promise CTOR and always making a
        frame copy, even if the param is unused in the coroutine body.
        * cp-tree.h (classtype_has_non_deleted_copy_ctor): New.

2020-02-26  Patrick Palka  <ppalka@redhat.com>

        * constraint.cc (finish_constraint_binary_op): Set expr's location range
        to the range of its operands.
        (satisfy_atom): Pass MAP instead of ARGS to diagnose_atomic_constraint.
        (diagnose_trait_expr): Take the instantiated parameter mapping MAP
        instead of the corresponding template arguments ARGS and adjust body
        accordingly.
        (diagnose_requires_expr): Likewise.
        (diagnose_atomic_constraint): Likewise.  When printing an atomic
        constraint expression, print the instantiated parameter mapping
        alongside it.
        * cxx-pretty-print.cc (cxx_pretty_printer::expression)
        [NONTYPE_ARGUMENT_PACK]: Print braces around a NONTYPE_ARGUMENT_PACK.
        (cxx_pretty_printer::type_id): Handle TYPE_ARGUMENT_PACK.

2020-02-26  Marek Polacek  <polacek@redhat.com>

        PR c++/93676 - value-init crash in template.
        * init.c (build_new_1): Don't call build_vec_init in a template.

2020-02-26  Marek Polacek  <polacek@redhat.com>

        PR c++/93862 - ICE with static_cast when converting from int[].
        * call.c (reference_compatible_p): No longer static.
        * cp-tree.h (reference_compatible_p): Declare.
        * typeck.c (build_static_cast_1): Use reference_compatible_p instead
        of reference_related_p.

2020-02-26  Marek Polacek  <polacek@redhat.com>

        PR c++/93803 - ICE with constexpr init and [[no_unique_address]].
        * constexpr.c (reduced_constant_expression_p): Don't crash on a null
        field.

2020-02-24  Martin Sebor  <msebor@redhat.com>

        PR c++/93804
        * parser.c (cp_parser_check_class_key): Avoid issuing -Wredundant-tags
        in shared C/C++ code in headers.
        Remove a duplicate hunk of code.

2020-02-24  Marek Polacek  <polacek@redhat.com>

        PR c++/93869 - ICE with -Wmismatched-tags.
        * parser.c (cp_parser_check_class_key): Check class_key earlier.

2020-02-24  Marek Polacek  <polacek@redhat.com>

        PR c++/93712 - ICE with ill-formed array list-initialization.
        * call.c (next_conversion): Return NULL for ck_aggr.
        (build_aggr_conv): Set u.expr instead of u.next.
        (build_array_conv): Likewise.
        (build_complex_conv): Likewise.
        (conv_get_original_expr): Handle ck_aggr.

2020-02-24  Jakub Jelinek  <jakub@redhat.com>

        P1937R2 - Fixing inconsistencies between const{expr,eval} functions
        * call.c (build_over_call): Don't evaluate immediate functions in
        unevaluated operands.

2020-02-24  Jason Merrill  <jason@redhat.com>

        P0780R2: Resolve lambda init-capture pack grammar.
        * parser.c (cp_parser_lambda_introducer): Expect &...x=y rather than
        ...&x=y.

2020-02-22  Marek Polacek  <polacek@redhat.com>

        PR c++/93882
        * decl.c (grokdeclarator): Use %qs in a diagnostic message.

2020-02-21  Martin Sebor  <msebor@redhat.com>

        PR gcov-profile/93753
        * class.c (check_flexarrays): Tighten up a test for potential members
        of anonymous structs or unions.

2020-02-20  Martin Sebor  <msebor@redhat.com>

        PR c++/93801
        * parser.c (cp_parser_check_class_key): Only handle true C++ class-keys.

2020-02-20  Martin Liska  <mliska@suse.cz>

        PR translation/93841
        * config/or1k/or1k.opt: Remove superfluous word.
        * doc/invoke.texi: Likewise.

2020-02-20  Martin Liska  <mliska@suse.cz>

        PR translation/93838
        * parser.c (cp_parser_decl_specifier_seq): Remove trailing space.

2020-02-19  Marek Polacek  <polacek@redhat.com>

        PR c++/93169 - wrong-code with a non-constexpr constructor.
        * constexpr.c (cxx_eval_call_expression): Only set TREE_READONLY
        on constant CONSTRUCTORs.

2020-02-15  Marek Polacek  <polacek@redhat.com>

        PR c++/93710 - poor diagnostic for array initializer.
        * call.c (build_user_type_conversion_1): Use cp_expr_loc_or_input_loc
        for an error call.

2020-02-15  Jason Merrill  <jason@redhat.com>

        PR c++/92556
        * pt.c (any_template_parm_r): Look into lambda body.

        PR c++/92583
        * pt.c (any_template_parm_r): Remove CONSTRUCTOR handling.

2020-02-14  Jakub Jelinek  <jakub@redhat.com>

        PR c++/61414
        * class.c (enum_min_precision): Change prec type from int to int &.

        PR libstdc++/92906
        * cp-tree.h (enum cp_tree_index): Add CPTI_FALLBACK_DFLOAT32_TYPE,
        CPTI_FALLBACK_DFLOAT64_TYPE and CPTI_FALLBACK_DFLOAT128_TYPE.
        (fallback_dfloat32_type, fallback_dfloat64_type,
        fallback_dfloat128_type): Define.
        * mangle.c (write_builtin_type): Handle fallback_dfloat*_type like
        dfloat*_type_node.
        * rtti.c (emit_support_tinfos): Emit DFP typeinfos even when dfp
        is disabled for compatibility.

2020-02-13  Jason Merrill  <jason@redhat.com>

        PR c++/93713
        * name-lookup.c (matching_fn_p): A function does not match a
        template.

        PR c++/93643
        PR c++/91476
        * tree.c (decl_linkage): Always lk_none for locals.

2020-02-12  Jason Merrill  <jason@redhat.com>

        PR c++/92583
        PR c++/92654
        * tree.c (cp_walk_subtrees): Walk CONSTRUCTOR types here.
        * pt.c (find_parameter_packs_r): Not here.

2020-02-12 Iain Sandoe  <iain@sandoe.co.uk>

        * coroutines.cc (build_actor_fn): Implement deallocation function
        selection per n4849, dcl.fct.def.coroutine bullet 12.
        (morph_fn_to_coro): Implement allocation function selection per
        n4849, dcl.fct.def.coroutine bullets 9 and 10.

2020-02-12  Marek Polacek  <polacek@redhat.com>

        PR c++/93684 - ICE-on-invalid with broken attribute.
        * parser.c (cp_parser_std_attribute): Peek a token first before
        consuming it.

2020-02-11  Jason Merrill  <jason@redhat.com>

        PR c++/93675
        * class.c (add_implicitly_declared_members): Use do_friend.
        * method.c (implicitly_declare_fn): Fix friend handling.
        (decl_remember_implicit_trigger_p): New.
        (synthesize_method): Use it.
        * decl2.c (mark_used): Use it.

2020-02-11  Jason Merrill  <jason@redhat.com>

        PR c++/93650
        PR c++/90691
        * constexpr.c (maybe_constant_value): Correct earlier change.
        (cxx_eval_binary_expression) [SPACESHIP_EXPR]: Pass lval through.
        * method.c (genericize_spaceship): Wrap result in TARGET_EXPR.

2020-02-12  Patrick Palka  <ppalka@redhat.com>

        PR c++/69448
        PR c++/80471
        * type-utils.h (find_type_usage): Refactor to take a tree * and to
        return a tree *, and update documentation accordingly.
        * pt.c (make_auto_1): Set AUTO_IS_DECLTYPE when building a
        decltype(auto) node.
        (make_constrained_decltype_auto): No need to explicitly set
        AUTO_IS_DECLTYPE anymore.
        (splice_late_return_type): Use find_type_usage to find and
        replace a possibly nested auto node instead of using is_auto.
        Check test for is_auto into an assert when deciding whether
        to late_return_type.
        (type_uses_auto): Adjust the call to find_type_usage.
        * parser.c (cp_parser_decltype): No need to explicitly set
        AUTO_IS_DECLTYPE anymore.

        * error.c (dump_decl) [CONCEPT_DECL]: Use dump_simple_decl.
        (dump_simple_decl): Handle standard concept definitions as well as
        variable concept definitions.

2020-02-10  Jakub Jelinek  <jakub@redhat.com>

        PR other/93641
        * error.c (dump_decl_name): Fix up last argument to strncmp.

2020-02-10  Jason Merrill  <jason@redhat.com>

        PR c++/93618
        * tree.c (array_of_unknown_bound_p): New.
        * init.c (perform_member_init): Do nothing for flexible arrays.

2020-02-09  Jakub Jelinek  <jakub@redhat.com>

        PR c++/93633
        * constexpr.c (cxx_eval_constant_expression): If obj is heap var with
        ARRAY_TYPE, use the element type.  Punt if objtype after that is not
        a class type.

2020-02-08  Jason Merrill  <jason@redhat.com>

        PR c++/90691
        * expr.c (fold_for_warn): Call maybe_constant_value.
        * constexpr.c (struct constexpr_ctx): Add uid_sensitive bit-field.
        (maybe_constant_value): Add uid_sensitive parm.
        (get_fundef_copy): Don't copy if it's true.
        (cxx_eval_call_expression): Don't instantiate if it's true.
        (cxx_eval_outermost_constant_expr): Likewise.

        PR c++/92852
        * constexpr.c (maybe_constant_value): Don't unshare if the cached
        value is the same as the argument.

        * typeck.c (maybe_warn_about_returning_address_of_local): Add
        location parameter.

        * typeck2.c (process_init_constructor): Also clear TREE_SIDE_EFFECTS
        if appropriate.

2020-02-08  Jakub Jelinek  <jakub@redhat.com>

        PR c++/93549
        * constexpr.c (find_array_ctor_elt): If last element has no index,
        for flag_checking verify all elts have no index.  If i is within the
        elts, return it directly, if it is right after the last elt, append
        if NULL index, otherwise force indexes on all elts.
        (cxx_eval_store_expression): Allow cep->index to be NULL.

2020-02-07  Marek Polacek  <polacek@redhat.com>

        PR c++/92947 - Paren init of aggregates in unevaluated context.
        * call.c (build_new_method_call_1): Don't check
        cp_unevaluated_operand.  Check the return value of digest_init.

2020-02-06  Jason Merrill  <jason@redhat.com>

        PR c++/92654
        * tree.c (cp_walk_subtrees): Walk into type template arguments.
        * cp-tree.h (TYPE_TEMPLATE_INFO_MAYBE_ALIAS): Use typedef_variant_p
        instead of TYPE_ALIAS_P.
        * pt.c (push_template_decl_real): Likewise.
        (find_parameter_packs_r): Likewise.  Remove dead code.
        * error.c (find_typenames_r): Remove dead code.

2020-02-06  Jason Merrill  <jason@redhat.com>

        PR c++/92517
        * parser.c (cp_parser_constraint_primary_expression): Do the main
        parse non-tentatively.

2020-02-06  Marek Polacek  <polacek@redhat.com>

        PR c++/93597 - ICE with lambda in operator function.
        * name-lookup.c (maybe_save_operator_binding): Check is_overloaded_fn.

2020-02-05  Jason Merrill  <jason@redhat.com>

        PR c++/93140
        * pt.c (tsubst_decl) [PARM_DECL]: Check cp_unevaluated_operand in
        handling of TREE_CHAIN for empty pack.

2020-02-05  Jakub Jelinek  <jakub@redhat.com>

        PR c++/93557
        * semantics.c (cp_build_vec_convert): Call decay_conversion on arg
        prior to passing it to c_build_vec_convert.

2020-02-05  Marek Polacek  <polacek@redhat.com>

        PR c++/93559 - ICE with CONSTRUCTOR flags verification.
        * decl.c (reshape_init_array_1): Don't reuse a CONSTRUCTOR with
        TREE_SIDE_EFFECTS.

2020-02-05  Jason Merrill  <jason@redhat.com>

        PR c++/92593
        * decl.c (grokdeclarator): Reject field of current class type even
        in a template.

2020-02-05  Bin Cheng  <bin.cheng@linux.alibaba.com>

        * coroutines.cc (maybe_promote_captured_temps): Increase the index
        number for temporary variables' name.

2020-02-05  Jun Ma  <JunMa@linux.alibaba.com>

        * coroutines.cc (build_co_await): Call convert_from_reference
        to wrap co_await_expr with indirect_ref which avoid
        reference/non-reference type confusion.

        (co_await_expander):  Sink to call_expr if await_resume
        is wrapped by indirect_ref.

2020-02-04  Jason Merrill  <jason@redhat.com>

        PR c++/93551
        * constraint.cc (satisfy_declaration_constraints): Check return
        value of push_tinst_level.

        PR c++/90951
        * constexpr.c (cxx_eval_array_reference): {}-initialize missing
        elements instead of value-initializing them.

        PR c++/86917
        * init.c (perform_member_init): Simplify.
        * constexpr.c (cx_check_missing_mem_inits): Allow uninitialized
        flexarray.
        (cxx_eval_vec_init_1): Handle CONSTRUCTOR.

2020-02-04  Iain Sandoe  <iain@sandoe.co.uk>

        * coroutines.cc (find_promise_type): Delete unused forward
        declaration.
        (struct coroutine_info): Add a bool for no promise type error.
        (coro_promise_type_found_p): Only emit the error for a missing
        promise once in each affected coroutine.

2020-02-03  Jason Merrill  <jason@redhat.com>

        PR c++/66477
        * constexpr.c (cxx_eval_constant_expression) [PARM_DECL]: Don't
        defer loading the value of a reference.

2020-02-03  Jason Merrill  <jason@redhat.com>

        PR c++/91953
        * constexpr.c (potential_constant_expression_1) [PARM_DECL]: Allow
        empty class type.
        [COMPONENT_REF]: A member function reference doesn't use the object
        as an rvalue.

2020-02-03  Iain Sandoe  <iain@sandoe.co.uk>

        PR c++/93458
        * coroutines.cc (struct coroutine_info): Add a bool flag to note
        that we emitted an error for a bad function return type.
        (get_coroutine_info): Tolerate an unset info table in case of
        missing traits.
        (find_coro_traits_template_decl): In case of error or if we didn't
        find a type template, note we emitted the error and suppress
        duplicates.
        (find_coro_handle_template_decl): Likewise.
        (instantiate_coro_traits): Only check for error_mark_node in the
        return from lookup_qualified_name. 
        (coro_promise_type_found_p): Reorder initialization so that we check
        for the traits and their usability before allocation of the info
        table.  Check for a suitable return type and emit a diagnostic for
        here instead of relying on the lookup machinery.  This allows the
        error to have a better location, and means we can suppress multiple
        copies.
        (coro_function_valid_p): Re-check for a valid promise (and thus the
        traits) before proceeding.  Tolerate missing info as a fatal error.

2020-02-03  Jason Merrill  <jason@redhat.com>

        PR c++/88256
        * cp-gimplify.c (predeclare_vla): New.
        (cp_genericize_r) [NOP_EXPR]: Call it.

2020-02-03  Jun Ma  <JunMa@linux.alibaba.com>

        * coroutines.cc (transform_await_wrapper): Set actor funcion as
        new context of label_decl.
        (build_actor_fn): Fill new field of await_xform_data.

2020-02-02  Marek Polacek  <polacek@redhat.com>

        PR c++/93530 - ICE on invalid alignas in a template.
        * decl.c (grokdeclarator): Call cplus_decl_attributes instead of
        decl_attributes.

2020-01-31  Jason Merrill  <jason@redhat.com>

        PR c++/86216
        * semantics.c (process_outer_var_ref): Capture VLAs even in
        unevaluated context.

        PR c++/14179
        * decl.c (reshape_init_array_1): Reuse a single CONSTRUCTOR with
        non-aggregate elements.
        (reshape_init_array): Add first_initializer_p parm.
        (reshape_init_r): Change first_initializer_p from bool to tree.
        (reshape_init): Pass init to it.

        PR c++/14179
        * parser.c (cp_parser_initializer_list): Suppress location wrappers
        after 256 elements.

2020-01-29  Jason Merrill  <jason@redhat.com>

        PR c++/82521
        * pt.c (tsubst_copy_and_build) [EQ_EXPR]: Only suppress warnings if
        the expression was dependent before substitution.

2020-01-30  Bin Cheng  <bin.cheng@linux.alibaba.com>

        * coroutines.cc (act_des_fn): New.
        (morph_fn_to_coro): Call act_des_fn to build actor/destroy decls.
        Access promise via actor function's frame pointer argument.
        (build_actor_fn, build_destroy_fn): Use frame pointer argument.

2020-01-30  Bin Cheng  <bin.cheng@linux.alibaba.com>

        * coroutines.cc (co_await_expander): Handle type conversion case.

2020-01-29  Jason Merrill  <jason@redhat.com>

        PR c++/90333
        PR c++/89640
        PR c++/60503
        * parser.c (cp_parser_type_specifier_seq): Don't parse attributes in
        a trailing return type.
        (cp_parser_lambda_declarator_opt): Parse C++11 attributes before
        parens.

2020-01-29  Marek Polacek  <polacek@redhat.com>

        PR c++/91754 - Fix template arguments comparison with class NTTP.
        * pt.c (class_nttp_const_wrapper_p): New.
        (template_args_equal): See through class_nttp_const_wrapper_p
        arguments.

2020-01-29  Marek Polacek  <polacek@redhat.com>

        PR c++/92948 - Fix class NTTP with template arguments.
        * pt.c (convert_nontype_argument): Use IMPLICIT_CONV_EXPR when
        converting a value-dependent expression to a class type.
        (tsubst_copy) <case VIEW_CONVERT_EXPR>: Allow IMPLICIT_CONV_EXPR
        as the result of the tsubst_copy call.

2020-01-29  Jakub Jelinek  <jakub@redhat.com>

        PR c++/91118
        * cp-gimplify.c (cxx_omp_predetermined_sharing): Return
        OMP_CLAUSE_DEFAULT_SHARED for typeinfo decls.

2020-01-28  Jason Merrill  <jason@redhat.com>

        PR c++/93442
        * parser.c (cp_parser_lambda_expression): Clear in_discarded_stmt.

        PR c++/93477
        PR c++/91476
        * decl2.c (copy_linkage): Do copy DECL_ONE_ONLY and DECL_WEAK.

        PR c++/90546
        * call.c (build_user_type_conversion_1): Allow a template conversion
        returning an rvalue reference to bind directly to an lvalue.

        PR c++/90731
        * decl.c (grokdeclarator): Propagate eh spec from typedef.

2020-01-28  Martin Liska  <mliska@suse.cz>

        PR c++/92440
        * pt.c (redeclare_class_template): Group couple of
        errors and inform messages with auto_diagnostic_group.

2020-01-28  Martin Liska  <mliska@suse.cz>

        PR c++/92440
        * pt.c (redeclare_class_template): Use inform
        for the second location.

2020-01-27  Jason Merrill  <jason@redhat.com>

        PR c++/90966
        * pt.c (tsubst_copy) [STRING_CST]: Don't use fold_convert.

2020-01-27  Iain Sandoe  <iain@sandoe.co.uk>

        PR c++/93443
        * coroutines.cc (morph_fn_to_coro): Check the ramp return
        value when it is constructed from the 'get return object'.

2020-01-27  Nathan Sidwell  <nathan@acm.org>

        PR c++/91826
        * name-lookup.c (is_ancestor): Allow CHILD to be a namespace alias.

2020-01-26  Jason Merrill  <jason@redhat.com>

        PR c++/90992
        * except.c (maybe_noexcept_warning): Check DECL_IN_SYSTEM_HEADER and
        temporarily enable -Wsystem-headers.  Change second warning to
        conditional inform.

        PR c++/90997
        * semantics.c (finish_call_expr): Don't call
        instantiate_non_dependent_expr before warn_for_memset.

2020-01-25  Marek Polacek  <polacek@redhat.com>

        PR c++/93414 - poor diagnostic for dynamic_cast in constexpr context.
        * constexpr.c (cxx_eval_dynamic_cast_fn): Add a reference
        dynamic_cast diagnostic.

2020-01-24  Jason Merrill  <jason@redhat.com>

        PR c++/93400 - ICE with constrained friend.
        * constraint.cc (maybe_substitute_reqs_for): New.
        * decl.c (function_requirements_equivalent_p): Call it.
        * pt.c (tsubst_friend_function): Only substitute
        TEMPLATE_PARMS_CONSTRAINTS.
        (tsubst_template_parms): Copy constraints.

2020-01-24  Jason Merrill  <jason@redhat.com>

        PR c++/93279 - ICE with lambda in member operator.
        * name-lookup.c (maybe_save_operator_binding): Don't remember
        class-scope bindings.

2020-01-24  Jason Merrill  <jason@redhat.com>

        PR c++/93377 - ICE with member alias in constraint.
        * pt.c (any_template_parm_r): Look at template arguments for all
        aliases, not only alias templates.

2020-01-24  Marek Polacek  <polacek@redhat.com>

        PR c++/93299 - ICE in tsubst_copy with parenthesized expression.
        * pt.c (tsubst_copy): Handle a REF_PARENTHESIZED_P VIEW_CONVERT_EXPR.

2020-01-24  Jason Merrill  <jason@redhat.com>

        PR c++/92852 - ICE with generic lambda and reference var.
        * constexpr.c (maybe_constant_value): Likewise.

2020-01-23  Paolo Carlini  <paolo.carlini@oracle.com>

        PR c++/92804
        * parser.c (cp_parser_nested_name_specifier_opt): Properly
        diagnose concept-ids.

2020-01-23  Jason Merrill  <jason@redhat.com>

        PR c++/93331 - ICE with __builtin_strchr.
        * constexpr.c (cxx_eval_builtin_function_call): Use the original
        argument if we didn't manage to extract a STRING_CST.

        PR c++/93345 - ICE with defaulted dtor and template.
        PR c++/33799
        * decl.c (cxx_maybe_build_cleanup): Don't try to set
        throwing_cleanup in a template.

2020-01-22  Marek Polacek  <polacek@redhat.com>

        PR c++/92907 - noexcept does not consider "const" in member functions.
        * g++.dg/cpp0x/noexcept56.C: New test.

2020-01-22  Marek Polacek  <polacek@redhat.com>

        PR c++/93324 - ICE with -Wall on constexpr if.
        * semantics.c (is_std_constant_evaluated_p): Check fndecl.

2020-01-22  Patrick Palka  <ppalka@redhat.com>

        * constraint.cc (get_mapped_args): Avoid using auto_vec
        as a vector element.  Release the vectors inside the lists
        vector.
        * parser.c (cp_literal_operator_id): Free the buffer.

2020-01-22  Jun Ma  <JunMa@linux.alibaba.com>

        * coroutines.cc (finish_co_await_expr): Add error check on return
        value of build_co_await.
        (finish_co_yield_expr,): Ditto.

2020-01-22  Jun Ma  <JunMa@linux.alibaba.com>

        * coroutines.cc (lookup_awaitable_member): Lookup an awaitable member.
        (lookup_promise_method): Emit diagnostic when get NULL_TREE back only.
        (build_co_await): Use lookup_awaitable_member instead of lookup_member.

2020-01-21  Jason Merrill  <jason@redhat.com>

        PR c++/60855 - ICE with sizeof VLA capture.
        * lambda.c (is_lambda_ignored_entity): Don't look past VLA capture.

        PR c++/90732 - ICE with VLA capture and generic lambda.
        * pt.c (tsubst_lambda_expr): Repeat add_capture for VLAs.

2020-01-21  Iain Sandoe  <iain@sandoe.co.uk>
            Bin Cheng  <bin.cheng@linux.alibaba.com>

        * coroutines.cc (coro_promise_type_found_p): Check for NULL return
        from complete_type_or_else.
        (register_param_uses): Likewise.
        (build_co_await): Do not try to use complete_type_or_else for void
        types, otherwise for incomplete types, check for NULL return from
        complete_type_or_else.

2020-01-21  Jason Merrill  <jason@redhat.com>

        PR c++/91476 - anon-namespace reference temp clash between TUs.
        * decl2.c (copy_linkage): Factor out of get_guard.
        * call.c (make_temporary_var_for_ref_to_temp): Use it.
        * decl.c (cp_finish_decomp): Use it.
        (cp_finish_decl): determine_visibility sooner.

2020-01-21  Bin Cheng  <bin.cheng@linux.alibaba.com>

        * coroutines.cc (finish_co_await_expr): Set return value flag.
        (finish_co_yield_expr, morph_fn_to_coro): Ditto.

2020-01-19  Jason Merrill  <jason@redhat.com>

        PR c++/33799 - destroy return value, take 2.
        * cp-tree.h (current_retval_sentinel): New macro.
        (struct language_function): Add throwing_cleanup bitfield.
        * decl.c (cxx_maybe_build_cleanup): Set it.
        * except.c (maybe_set_retval_sentinel)
        (maybe_splice_retval_cleanup): New functions.
        * parser.c (cp_parser_compound_statement): Call
        maybe_splice_retval_cleanup.
        * typeck.c (check_return_expr): Call maybe_set_retval_sentinel.

        * parser.c (cp_parser_lambda_body): Use cp_parser_function_body.

2020-01-18  Jakub Jelinek  <jakub@redhat.com>

        * coroutines.cc (get_fn_local_identifier): Fix NO_DOT_IN_LABEL
        but non-NO_DOLLAR_IN_LABEL case build.

2020-01-18  Iain Sandoe  <iain@sandoe.co.uk>

        * Make-lang.in: Add coroutines.o.
        * cp-tree.h (lang_decl-fn): coroutine_p, new bit.
        (DECL_COROUTINE_P): New.
        * lex.c (init_reswords): Enable keywords when the coroutine flag
        is set,
        * operators.def (co_await): New operator.
        * call.c (add_builtin_candidates): Handle CO_AWAIT_EXPR.
        (op_error): Likewise.
        (build_new_op_1): Likewise.
        (build_new_function_call): Validate coroutine builtin arguments.
        * constexpr.c (potential_constant_expression_1): Handle
        CO_AWAIT_EXPR, CO_YIELD_EXPR, CO_RETURN_EXPR.
        * coroutines.cc: New file.
        * cp-objcp-common.c (cp_common_init_ts): Add CO_AWAIT_EXPR,
        CO_YIELD_EXPR, CO_RETRN_EXPR as TS expressions.
        * cp-tree.def (CO_AWAIT_EXPR, CO_YIELD_EXPR, (CO_RETURN_EXPR): New.
        * cp-tree.h (coro_validate_builtin_call): New.
        * decl.c (emit_coro_helper): New.
        (finish_function): Handle the case when a function is found to
        be a coroutine, perform the outlining and emit the outlined
        functions. Set a bit to signal that this is a coroutine component.
        * parser.c (enum required_token): New enumeration RT_CO_YIELD.
        (cp_parser_unary_expression): Handle co_await.
        (cp_parser_assignment_expression): Handle co_yield.
        (cp_parser_statement): Handle RID_CO_RETURN.
        (cp_parser_jump_statement): Handle co_return.
        (cp_parser_operator): Handle co_await operator.
        (cp_parser_yield_expression): New.
        (cp_parser_required_error): Handle RT_CO_YIELD.
        * pt.c (tsubst_copy): Handle CO_AWAIT_EXPR.
        (tsubst_expr): Handle CO_AWAIT_EXPR, CO_YIELD_EXPR and
        CO_RETURN_EXPRs.
        * tree.c (cp_walk_subtrees): Likewise.

2020-01-17  Jason Merrill  <jason@redhat.com>

        PR c++/92531 - ICE with noexcept(lambda).
        * pt.c (uses_template_parms): Don't try to enumerate all the
        expression cases.

2020-01-17  Jakub Jelinek  <jakub@redhat.com>

        PR c++/93228
        * parser.c (cp_parser_template_name): Look up deprecated attribute
        in DECL_TEMPLATE_RESULT or its type's attributes.

2020-01-16  Jason Merrill  <jason@redhat.com>

        PR c++/93286 - ICE with __is_constructible and variadic template.
        * pt.c (tsubst) [TREE_LIST]: Handle pack expansion.
        (tsubst_copy_and_build) [TRAIT_EXPR]: Always use tsubst for type2.

        PR c++/93280 - ICE with aggregate assignment and DMI.
        * init.c (get_nsdmi): Set TARGET_EXPR_DIRECT_INIT_P here.
        * typeck2.c (digest_nsdmi_init): Not here.

2020-01-15  Paolo Carlini  <paolo.carlini@oracle.com>

        PR c++/91073
        * cp-tree.h (is_constrained_auto): New.
        * parser.c (cp_parser_maybe_commit_to_declaration): Correctly
        handle concept-check expressions; take a cp_decl_specifier_seq*
        instead of a bool.
        (cp_parser_condition): Update call.
        (cp_parser_simple_declaration): Likewise.
        (cp_parser_placeholder_type_specifier): Correctly handle
        concept-check expressions.

2020-01-15  Jason Merrill  <jason@redhat.com>

        Revert
        PR c++/33799 - destroy return value if local cleanup throws.
        * cp-tree.h (current_retval_sentinel): New macro.
        * decl.c (start_preparsed_function): Set up cleanup for retval.
        * typeck.c (check_return_expr): Set current_retval_sentinel.

        PR c++/93257 - consteval void function.
        * constexpr.c (verify_constant): Allow void_node.

        PR c++/92871 - bad code with xvalue and GNU ?: extension.
        * call.c (prevent_lifetime_extension): New.
        (build_conditional_expr_1): Use it.

2020-01-14  Nathan Sidwell  <nathan@acm.org>

        PR c++/90916
        * pt.c (retrieve_specialization): Use get_template_info, not open
        coding access.

        PR c++/90916
        * pt.c (retrieve_specialization): Get the TI from the decl or the
        classtype as appropriate.

2020-01-14  David Malcolm  <dmalcolm@redhat.com>

        * cp-gimplify.c (source_location_table_entry_hash::empty_zero_p):
        New static constant.
        * cp-tree.h (named_decl_hash::empty_zero_p): Likewise.
        (struct named_label_hash::empty_zero_p): Likewise.
        * decl2.c (mangled_decl_hash::empty_zero_p): Likewise.

2020-01-14  Jason Merrill  <jason@redhat.com>

        PR c++/92590 - wrong handling of inherited default ctor.
        * class.c (add_method): A constrained inherited ctor doesn't hide an
        implicit derived ctor.
        Revert:
        PR c++/92552 - ICE with inherited constrained default ctor.
        * pt.c (instantiate_class_template_1): Copy
        TYPE_HAS_USER_CONSTRUCTOR.
        PR c++/91930 - ICE with constrained inherited default ctor.
        * name-lookup.c (do_class_using_decl): Set TYPE_HAS_USER_CONSTRUCTOR
        for inherited constructor.
        PR c++/92594 - ICE with inherited trivial default ctor.
        * method.c (trivial_fn_p): Treat an inherited default constructor
        like a normal default constructor.

        PR c++/92594 - ICE with inherited trivial default ctor.
        * method.c (trivial_fn_p): Treat an inherited default constructor
        like a normal default constructor.

        PR c++/92009 - ICE with punning of typeid.
        * rtti.c (get_tinfo_desc): Call xref_basetypes.
        * constexpr.c (cxx_fold_indirect_ref): Don't strip
        REINTERPRET_CAST_P.

2020-01-13  Jason Merrill  <jason@redhat.com>

        PR c++/92746 - ICE with noexcept of function concept check.
        * except.c (check_noexcept_r): Handle concept-check.

        PR c++/92582 - ICE with member template as requirement.
        * pt.c (struct find_template_parameter_info): Add ctx_parms.
        (any_template_parm_r): Handle TEMPLATE_DECL.
        (find_template_parameters): Take parms instead of their depth.
        * constraint.cc (build_parameter_mapping): Pass them.

        PR c++/33799 - destroy return value if local cleanup throws.
        * cp-tree.h (current_retval_sentinel): New macro.
        * decl.c (start_preparsed_function): Set up cleanup for retval.
        * typeck.c (check_return_expr): Set current_retval_sentinel.

        PR c++/93238 - short right-shift with enum.
        * typeck.c (cp_build_binary_op): Use folded op1 for short_shift.

2020-01-10  Jason Merrill  <jason@redhat.com>

        * typeck.c (cp_build_binary_op): Restore short_shift code.

        PR c++/93143 - incorrect tree sharing with constexpr.
        * constexpr.c (cxx_eval_outermost_constant_expr): Don't assume
        CONSTRUCTORs are already unshared.

        PR c++/93173 - incorrect tree sharing.
        PR c++/93033
        * cp-gimplify.c (cp_gimplify_init_expr, cp_gimplify_expr): Use
        copy_if_shared after cp_genericize_tree.
        * typeck2.c (split_nonconstant_init): Don't unshare here.

2020-01-08  Jason Merrill  <jason@redhat.com>

        * cp-gimplify.c (cp_gimplify_expr) [TARGET_EXPR]: Check
        TARGET_EXPR_DIRECT_INIT_P.
        * constexpr.c (cxx_eval_constant_expression): Likewise.

2020-01-08  Jason Merrill  <jason@redhat.com>

        PR c++/91369 - constexpr destructor and member initializer.
        * constexpr.c (cxx_eval_store_expression): Look through TARGET_EXPR
        when not preevaluating.

2020-01-08  Jason Merrill  <jason@redhat.com>

        * constexpr.c (cxx_eval_call_expression): Remove DECL_BY_REFERENCE
        support.

2020-01-07  Paolo Carlini  <paolo.carlini@oracle.com>

        * init.c (build_new): Add location_t parameter and use it throughout.
        (build_raw_new_expr): Likewise.
        * parser.c (cp_parser_new_expression): Pass the combined_loc.
        * pt.c (tsubst_copy_and_build): Adjust call.
        * cp-tree.h: Update declarations.

2020-01-07  Jason Merrill  <jason@redhat.com>

        PR c++/47877 - -fvisibility-inlines-hidden and member templates.
        * decl2.c (determine_visibility): -fvisibility-inlines-hidden beats
        explicit class visibility for a template.

2020-01-07  Richard Sandiford  <richard.sandiford@arm.com>

        * mangle.c (mangle_type_attribute_p): New function, split out from...
        (write_CV_qualifiers_for_type): ...here.  Don't mangle attributes
        that contain a space.

2020-01-07  Jakub Jelinek  <jakub@redhat.com>

        PR c++/91369
        * constexpr.c (struct constexpr_global_ctx): Add heap_alloc_count
        member, initialize it to zero in ctor.
        (cxx_eval_call_expression): Bump heap_dealloc_count when deleting
        a heap object.  Don't cache calls to functions which allocate some
        heap objects and don't deallocate them or deallocate some heap
        objects they didn't allocate.

2020-01-06  Jason Merrill  <jason@redhat.com>

        PR c++/92552 - ICE with inherited constrained default ctor.
        * pt.c (instantiate_class_template_1): Copy
        TYPE_HAS_USER_CONSTRUCTOR.
        * class.c (one_inherited_ctor): Don't set it here.

2020-01-06  Andrew Sutton  <asutton@lock3software.com>

        PR c++/92739 - parsing requires clause with attributes.
        * parser.c (cp_parser_constraint_requires_parens): Exclude
        attributes as postfix expressions.

2020-01-05  Jakub Jelinek  <jakub@redhat.com>

        PR c++/93138
        * parser.c (cp_parser_check_class_key): Disable access checks for the
        simple name lookup.
        (cp_parser_maybe_warn_enum_key): Likewise.  Return early if
        !warn_redundant_tags.

2010-01-05  Jakub Jelinek  <jakub@redhat.com>

        PR c++/93046
        * cp-gimplify.c (cp_gimplify_init_expr): Don't look through
        TARGET_EXPR if it has been gimplified already.

2020-01-03  Jason Merrill  <jason@redhat.com>

        PR c++/93033 - incorrect tree node sharing with array init.
        * typeck2.c (split_nonconstant_init): Unshare non-decl.
        * cp-gimplify.c (cp_gimplify_init_expr): Only split if -fexceptions.

2020-01-02  Jason Merrill  <jason@redhat.com>

        * pt.c (invalid_nontype_parm_type_p): Reject class placeholder in
        C++17.

2020-01-02  Jakub Jelinek  <jakub@redhat.com>

        PR c/90677
        * cp-objcp-common.c (identifier_global_tag): Return NULL_TREE if name
        has not been found, rather than error_mark_node.

2020-01-01  Jakub Jelinek  <jakub@redhat.com>

        Update copyright years.
\f
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