path: root/gcc/cp/ChangeLog

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.c (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.

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