blob: 3fe0cedb0e321987d1b3a7bd5ebeed92cb0ab66c [file] [log] [blame]
2019-02-19 Jason Merrill <jason@redhat.com>
PR c++/88368 - wrong 'use of deleted function'
* method.c (walk_field_subobs): Remember errors from get_nsdmi.
(get_defaulted_eh_spec): Call push_tinst_level.
* pt.c (maybe_instantiate_noexcept): Keep error_mark_node.
* typeck2.c (merge_exception_specifiers): Handle error_mark_node.
2019-02-19 Chung-Lin Tang <cltang@codesourcery.com>
PR c/87924
* parser.c (cp_parser_oacc_clause_wait): Add representation of wait
clause without argument as 'wait (GOMP_ASYNC_NOVAL)', adjust comments.
2019-02-19 Jakub Jelinek <jakub@redhat.com>
PR c++/89387
* lambda.c (maybe_generic_this_capture): Don't check
DECL_NONSTATIC_MEMBER_FUNCTION_P on USING_DECLs.
PR c++/89391
* typeck.c (build_reinterpret_cast_1): Don't handle void to
&& conversion go through build_target_expr_with_type.
PR c++/89390
* error.c (qualified_name_lookup_error): Only call
suggest_alternative_in_scoped_enum if name is IDENTIFIER_NODE.
2019-02-19 Tom Honermann <tom@honermann.net>
* name-lookup.c (get_std_name_hint): Added u8string as a name hint.
2019-02-18 Jason Merrill <jason@redhat.com>
PR c++/89336 - multiple stores in constexpr stmt.
* constexpr.c (cxx_eval_store_expression): Preevaluate scalar or
assigned value.
* pt.c (check_explicit_specialization): If the declarator is a
template-id, only check whether the arguments are dependent.
Improve duplicate [[likely]] diagnostic.
* parser.c (cp_parser_statement): Make attrs_loc a range. Pass it
to process_stmt_hotness_attribute.
* cp-gimplify.c (process_stmt_hotness_attribute): Take attrs_loc.
(genericize_if_stmt): Use likely/unlikely instead of predictor_name.
2019-02-17 Marek Polacek <polacek@redhat.com>
PR c++/89217 - ICE with list-initialization in range-based for loop.
* constexpr.c (unshare_constructor): No longer static.
* cp-tree.h (unshare_constructor): Declare.
* semantics.c (finish_compound_literal): When dealing with a
non-dependent expression in a template, return the original
expression. Pass LOOKUP_NO_NARROWING to digest_init_flags.
2019-02-13 Marek Polacek <polacek@redhat.com>
PR c++/89297 - ICE with OVERLOAD in template.
* semantics.c (finish_compound_literal): Call
instantiate_non_dependent_expr_sfinae.
2019-02-13 Alexandre Oliva <aoliva@redhat.com>
PR c++/86379
* cp-tree.h (USING_DECL_SCOPE): Use result rather than type.
* name-lookup.c (strip_using_decl): Use USING_DECL_SCOPE.
* search.c (protected_accessible_p): Follow USING_DECL_DECLS.
(shared_member_p): Likewise.
(lookup_member): Likewise.
* decl.c (grok_special_member_properties): Skip USING_DECLs.
* semantics.c (finish_omp_declare_simd_methods): Likewise.
(finish_qualified_id_expr): Do not call shared_member_p with
a dependent expr.
PR c++/87322
* pt.c (tsubst_lambda_expr): Avoid duplicate tsubsting.
Move cp_evaluated resetting before signature tsubsting.
(gen_elem_of_pack_expansion_instantiation): Separate local
specializations per index.
2019-02-13 David Malcolm <dmalcolm@redhat.com>
PR c++/89036
* class.c (add_method): Drop destructor assertion.
2019-02-13 Paolo Carlini <paolo.carlini@oracle.com>
PR c++/88986
* decl.c (make_typename_type): Allow for TYPE_PACK_EXPANSION as
context (the first argument).
* pt.c (tsubst, case TYPENAME_TYPE): Handle TYPE_PACK_EXPANSION
as context.
2019-02-12 Jason Merrill <jason@redhat.com>
PR c++/89144 - link error with constexpr initializer_list.
* call.c (convert_like_real) [ck_list]: Don't allocate a temporary
array for an empty list.
* typeck2.c (store_init_value): Don't use cxx_constant_init in a
template.
2019-02-11 Jason Merrill <jason@redhat.com>
PR c++/89241 - ICE with __func__ in lambda in template.
* pt.c (enclosing_instantiation_of): Also check
instantiated_lambda_fn_p for the template context.
2019-02-11 Marek Polacek <polacek@redhat.com>
PR c++/89212 - ICE converting nullptr to pointer-to-member-function.
* pt.c (tsubst_copy_and_build) <case CONSTRUCTOR>: Return early for
null member pointer value.
2019-02-11 Jakub Jelinek <jakub@redhat.com>
PR c++/88977
* pt.c (convert_nontype_argument): Pass true as manifestly_const_eval
to maybe_constant_value calls.
2019-02-11 Marek Polacek <polacek@redhat.com>
* typeck2.c (digest_init_r): Remove commented code.
2019-02-11 Martin Sebor <msebor@redhat.com>
PR c++/87996
* decl.c (compute_array_index_type_loc): Preserve signed sizes
for diagnostics. Call valid_array_size_p instead of error.
* init.c (build_new_1): Compute size for diagnostic. Call
invalid_array_size_error
(build_new): Call valid_array_size_p instead of error.
2019-02-07 Alexandre Oliva <aoliva@redhat.com>
PR c++/86218
* call.c (compare_ics): Deal with ck_aggr in either cs.
2019-02-06 David Malcolm <dmalcolm@redhat.com>
PR c++/71302
* call.c (get_location_for_expr_unwinding_for_system_header): New
function.
(conversion_null_warnings): Use it when getting locations for
EXPR, effectively adding a call to
get_location_for_expr_unwinding_for_system_header for
-Wconversion-null and making use of EXPR_LOCATION for
-Wzero-as-null-pointer-constant.
2019-02-05 Jakub Jelinek <jakub@redhat.com>
PR c++/89187
* optimize.c (maybe_thunk_body): Clear TREE_ADDRESSABLE on
PARM_DECLs of the thunk.
* lambda.c (maybe_add_lambda_conv_op): Likewise.
2019-02-05 Marek Polacek <polacek@redhat.com>
PR c++/89158 - by-value capture of constexpr variable broken.
* call.c (convert_like_real) <case ck_user>: Call mark_exp_read
instead of mark_rvalue_use.
2019-02-05 Alexandre Oliva <aoliva@redhat.com>
PR c++/87770
* pt.c (instantiates_primary_template_p): New.
(type_dependent_expression_p): Use it.
2019-02-01 Jason Merrill <jason@redhat.com>
PR c++/88761 - ICE with reference capture of constant.
* lambda.c (mark_const_cap_r): Do walk subtrees of DECL_EXPR for
non-proxy decls.
2019-02-01 Marek Polacek <polacek@redhat.com>
PR c++/88325 - ICE with invalid out-of-line template member definition.
* parser.c (cp_parser_class_name): Don't call make_typename_type
for overloads.
2019-02-01 Jakub Jelinek <jakub@redhat.com>
PR c++/87175
* parser.c (cp_parser_gnu_attributes_opt): Set ok to false
if require_open failed.
2019-01-31 Marek Polacek <polacek@redhat.com>
PR c++/89083, c++/80864 - ICE with list initialization in template.
* constexpr.c (adjust_temp_type): Use copy_node and change the type
instead of using build_constructor.
* decl.c (reshape_init_r): Don't reshape a digested initializer.
Return the initializer for COMPOUND_LITERAL_P.
PR c++/88983 - ICE with switch in constexpr function.
* constexpr.c (cxx_eval_switch_expr): Use SWITCH_COND and SWITCH_BODY.
(cxx_eval_constant_expression) <case COND_EXPR>: Don't look for the
label in the else branch if we found it in the then branch.
2019-01-30 Jason Merrill <jason@redhat.com>
PR c++/88752 - ICE with lambda and constexpr if.
* cp-tree.h (LAMBDA_EXPR_INSTANTIATED): New.
* pt.c (tsubst_lambda_expr): Set it.
(instantiated_lambda_fn_p): Check it.
(enclosing_instantiation_of): Use it.
2019-01-31 Jakub Jelinek <jakub@redhat.com>
PR libstdc++/88170
* cxx-pretty-print.c (pp_cxx_enumeration_constant): Print always as
a C cast in pp_c_flag_gnu_v3 mode.
2019-01-30 Jakub Jelinek <jakub@redhat.com>
PR c++/88988
* lambda.c (is_capture_proxy): Don't return true for
DECL_OMP_PRIVATIZED_MEMBER artificial vars.
2019-01-30 Marek Polacek <polacek@redhat.com>
PR c++/89119 - ICE with value-initialization in template.
* pt.c (tsubst_copy_and_build): Handle RANGE_EXPR.
2019-01-29 Jason Merrill <jason@redhat.com>
PR c++/86943 - wrong code converting lambda to function pointer.
* lambda.c (maybe_add_lambda_conv_op): Use a template-id in the
call. Only forward parms for decltype.
* pt.c (tsubst_copy_and_build) [CALL_EXPR]: Handle CALL_FROM_THUNK_P
specially.
* typeck.c (check_return_expr): Don't mess with a thunk call.
2019-01-28 Jason Merrill <jason@redhat.com>
PR c++/89089 - ICE with [[no_unique_address]].
PR c++/88865 - wrong layout with [[no_unique_address]].
* class.c (check_field_decls): A potentially-overlapping field makes
the class non-layout-POD, but not non-empty.
(end_of_class): Always consider empty data members.
(layout_class_type): Set DECL_SIZE for empty fields.
2019-01-28 Marek Polacek <polacek@redhat.com>
PR c++/88358 - name wrongly treated as type.
* parser.c (cp_parser_direct_declarator): Don't assume a qualified-id
in parameter-list is a type if the function's declarator-id is not
qualified.
2019-01-27 Marek Polacek <polacek@redhat.com>
PR c++/88815 - narrowing conversion lost in decltype.
PR c++/78244 - narrowing conversion in template not detected.
* cp-tree.h (CONSTRUCTOR_IS_DEPENDENT): New.
* pt.c (instantiation_dependent_r): Consider a CONSTRUCTOR with
CONSTRUCTOR_IS_DEPENDENT instantiation-dependent.
* semantics.c (finish_compound_literal): When the compound literal
isn't instantiation-dependent and the type isn't type-dependent,
fall back to the normal processing. Set CONSTRUCTOR_IS_DEPENDENT.
PR c++/89024 - ICE with incomplete enum type.
* call.c (standard_conversion): When converting an
ARITHMETIC_TYPE_P to an incomplete type, return NULL.
2019-01-25 Paolo Carlini <paolo.carlini@oracle.com>
PR c++/88969
* call.c (build_op_delete_call): Implement 7.6.2.5/(10.1).
* decl2.c (coerce_delete_type): Use build_pointer_type instead
of TYPE_POINTER_TO.
2019-01-24 Jason Merrill <jason@redhat.com>
PR c++/89001 - mangling of reference temporaries
* cp-tree.h (struct saved_scope): Add ref_temp_count.
(current_ref_temp_count): New macro.
* mangle.c (mangle_ref_init_variable): Use it.
* typeck2.c (store_init_value): Clear it.
* call.c (make_temporary_var_for_ref_to_temp): Copy public and
comdat.
2019-01-24 Jakub Jelinek <jakub@redhat.com>
PR c++/88976
* semantics.c (finish_omp_cancel): Diagnose more than one if
on #pragma omp cancel with different modifiers. Use
maybe_convert_cond when not in template or build_x_binary_op
otherwise.
2019-01-23 Marek Polacek <polacek@redhat.com>
PR c++/88757 - qualified name treated wrongly as type.
* parser.c (cp_parser_direct_declarator): Don't treat qualified-ids
in parameter-list as types if name lookup for declarator-id didn't
find one or more function templates.
2019-01-23 Jakub Jelinek <jakub@redhat.com>
PR c/44715
* cp-gimplify.c (genericize_cp_loop): Call begin_bc_block only
after genericizing cond and incr expressions.
PR c++/88984
* cp-gimplify.c (genericize_switch_stmt): Move cond genericization
before the begin_bc_block call.
2019-01-21 Jason Merrill <jason@redhat.com>
PR c++/87893 - constexpr ctor ICE on ARM.
PR c++/88293 - ICE with comma expression.
* constexpr.c (initialized_type): Don't shortcut non-void type.
Handle COMPOUND_EXPR.
(cxx_eval_outermost_constant_expr): Return early for void type.
2019-01-21 Jakub Jelinek <jakub@redhat.com>
PR c++/88949
* optimize.c (cxx_copy_decl): New function.
(clone_body): Use it instead of copy_decl_no_change.
PR sanitizer/88901
* typeck.c (cp_build_binary_op): Don't instrument
SANITIZE_POINTER_COMPARE if processing_template_decl.
(pointer_diff): Similarly for SANITIZE_POINTER_SUBTRACT.
2019-01-18 Jason Merrill <jason@redhat.com>
PR c++/88875 - error with explicit list constructor.
* call.c (reference_binding): Don't modify EXPR. Set
need_temporary_p on the ck_user conversion for a temporary.
(convert_like_real): Check it.
2019-01-18 H.J. Lu <hongjiu.lu@intel.com>
PR c/51628
PR c/88664
* call.c (convert_for_arg_passing): Upate the
warn_for_address_or_pointer_of_packed_member call.
* typeck.c (convert_for_assignment): Likewise.
2019-01-17 Jason Merrill <jason@redhat.com>
PR c++/86205 - ICE with ?: of throw and template-id.
* pt.c (resolve_nondeduced_context_or_error): Split out from...
* typeck.c (decay_conversion): ...here.
* call.c (build_conditional_expr_1): Use it.
PR c++/86740, ICE with constexpr if and nested generic lambdas.
* tree.c (cp_walk_subtrees): Handle LAMBDA_EXPR.
2019-01-17 Paolo Carlini <paolo.carlini@oracle.com>
* decl.c (grokdeclarator): Use typespec_loc in error messages
about 'auto' and trailing return type.
2019-01-17 David Malcolm <dmalcolm@redhat.com>
PR c++/88699
* class.c (add_method): Don't use DECL_DESTRUCTOR_P on
USING_DECLs.
2019-01-17 Nathan Sidwell <nathan@acm.org>
PR c++/86610
* semantics.c (process_outer_var_ref): Only skip dependent types
in templates.
2019-01-17 Alexandre Oliva <aoliva@redhat.com>
PR c++/87768
* cp-tree.h (saved_scope): Add suppress_location_wrappers.
* name-lookup.c (do_push_to_top_level): Save and reset it.
(do_pop_from_top_level): Restore it.
PR c++/86648
* pt.c (make_template_placeholder): Use auto_identifier.
(is_auto): Drop CLASS_PLACEHOLDER_TEMPLATE test.
* error.c (dump_type): Handle template placeholders.
* cxx-pretty-print.c (pp_cx_unqualified_id): Likewise.
PR c++/88146
* cvt.c (convert_to_void): Handle all cdtor calls as if
returning void.
2019-01-16 Paolo Carlini <paolo.carlini@oracle.com>
* decl.c (grokdeclarator): Use locations[ds_storage_class] in
error messages about ill-formed uses of mutable.
2019-01-16 Marek Polacek <polacek@redhat.com>
PR c++/78244 - narrowing conversion in template not detected.
* call.c (perform_implicit_conversion_flags): Set
IMPLICIT_CONV_EXPR_BRACED_INIT.
* cp-tree.h (IMPLICIT_CONV_EXPR_BRACED_INIT): New.
* pt.c (tsubst_copy_and_build): Use it.
2019-01-15 David Malcolm <dmalcolm@redhat.com>
PR c++/88795
* pt.c (build_deduction_guide): Bail out if tsubst_arg_types
fails.
2019-01-15 Paolo Carlini <paolo.carlini@oracle.com>
* decl.c (start_decl): Improve error location.
* decl2.c (grokfield): Likewise.
2019-01-15 Paolo Carlini <paolo.carlini@oracle.com>
* decl.c (grokdeclarator): Move further up the location_t loc
declaration and use the location when building a TYPE_DECL for
a typedef name.
* decl2.c (grokbitfield): Use DECL_SOURCE_LOCATION in the error
about an ill-formed bit-field as typedef.
2019-01-14 Marek Polacek <polacek@redhat.com>
PR c++/88830 - ICE with abstract class.
* decl2.c (maybe_emit_vtables): Check CLASSTYPE_LAZY_DESTRUCTOR.
Fix formatting.
PR c++/88825 - ICE with bogus function return type deduction.
* typeck.c (can_do_nrvo_p): Check error_mark_node.
2019-01-14 Tom Honermann <tom@honermann.net>
Implement P0482R5, char8_t: A type for UTF-8 characters and strings
* cvt.c (type_promotes_to): Handle char8_t promotion.
* decl.c (grokdeclarator): Handle invalid type specifier
combinations involving char8_t.
* lex.c (init_reswords): Add char8_t as a reserved word.
* mangle.c (write_builtin_type): Add name mangling for char8_t (Du).
* parser.c (cp_keyword_starts_decl_specifier_p)
(cp_parser_simple_type_specifier): Recognize char8_t as a simple
type specifier.
(cp_parser_string_literal): Use char8_array_type_node for the type
of CPP_UTF8STRING.
(cp_parser_set_decl_spec_type): Tolerate char8_t typedefs in system
headers.
* rtti.c (emit_support_tinfos): type_info support for char8_t.
* tree.c (char_type_p): Recognize char8_t as a character type.
* typeck.c (string_conv_p): Handle conversions of u8 string
literals of char8_t type.
(check_literal_operator_args): Handle UDLs with u8 string literals
of char8_t type.
* typeck2.c (ordinary_char_type_p): New.
(digest_init_r): Disallow initializing a char array with a u8 string
literal.
2019-01-14 Martin Liska <mliska@suse.cz>
PR gcov-profile/88263
* decl2.c (get_tls_wrapper_fn): Use DECL_SOURCE_LOCATION
as location of the TLS wrapper.
2019-01-12 Paolo Carlini <paolo.carlini@oracle.com>
* decl.c (cp_finish_decl): Improve error location.
* decl2.c (grokfield): Likewise, improve two locations.
2019-01-11 Marek Polacek <polacek@redhat.com>
PR c++/88692, c++/87882 - -Wredundant-move false positive with *this.
* typeck.c (maybe_warn_pessimizing_move): Return if ARG isn't
ADDR_EXPR.
2019-01-11 Jason Merrill <jason@redhat.com>
PR c++/88312 - pack expansion of decltype.
* pt.c (instantiation_dependent_r): A template non-type parameter
pack is instantiation-dependent.
2019-01-11 Jason Merrill <jason@redhat.com>
PR c++/88613 - ICE with use of const var in lambda.
* expr.c (mark_use): Fix location wrapper handling.
* cp-gimplify.c (cp_fold_maybe_rvalue): Call mark_rvalue_use.
2019-01-11 Tobias Burnus <burnus@net-b.de>
PR C++/88114
* decl2.c (maybe_emit_vtables): If needed, generate code for
the destructor of an abstract class.
(mark_used): Update comment for older function-name change.
2019-01-11 Paolo Carlini <paolo.carlini@oracle.com>
* decl.c (start_decl): Improve error location.
(grokdeclarator): Likewise, improve two locations.
2019-01-09 Sandra Loosemore <sandra@codesourcery.com>
PR other/16615
* cp-tree.h: Mechanically replace "can not" with "cannot".
* parser.c: Likewise.
* pt.c: Likewise.
2019-01-08 Paolo Carlini <paolo.carlini@oracle.com>
* decl.c (grok_reference_init): Improve error location.
(grokdeclarator): Likewise, improve two locations.
2019-01-08 Marek Polacek <polacek@redhat.com>
PR c++/88538 - braced-init-list in template-argument-list.
* parser.c (cp_parser_template_argument): Handle braced-init-list when
in C++20.
PR c++/88548 - this accepted in static member functions.
* parser.c (cp_debug_parser): Adjust printing of
local_variables_forbidden_p.
(cp_parser_new): Set local_variables_forbidden_p to 0 rather than false.
(cp_parser_primary_expression): When checking
local_variables_forbidden_p, use THIS_FORBIDDEN or
LOCAL_VARS_FORBIDDEN.
(cp_parser_lambda_body): Update the type of
local_variables_forbidden_p. Set it to 0 rather than false.
(cp_parser_condition): Adjust call to cp_parser_declarator.
(cp_parser_explicit_instantiation): Likewise.
(cp_parser_init_declarator): Likewise.
(cp_parser_declarator): New parameter. Use it.
(cp_parser_direct_declarator): New parameter. Use it to set
local_variables_forbidden_p. Adjust call to cp_parser_declarator.
(cp_parser_type_id_1): Adjust call to cp_parser_declarator.
(cp_parser_parameter_declaration): Likewise.
(cp_parser_default_argument): Update the type of
local_variables_forbidden_p. Set it to LOCAL_VARS_AND_THIS_FORBIDDEN
rather than true.
(cp_parser_member_declaration): Tell cp_parser_declarator if we saw
'static' or 'friend'.
(cp_parser_exception_declaration): Adjust call to cp_parser_declarator.
(cp_parser_late_parsing_default_args): Update the type of
local_variables_forbidden_p. Set it to LOCAL_VARS_AND_THIS_FORBIDDEN
rather than true.
(cp_parser_cache_defarg): Adjust call to cp_parser_declarator.
(cp_parser_objc_class_ivars): Likewise.
(cp_parser_objc_struct_declaration): Likewise.
(cp_parser_omp_for_loop_init): Likewise.
* parser.h (cp_parser): Change the type of local_variables_forbidden_p
to unsigned char.
(LOCAL_VARS_FORBIDDEN, LOCAL_VARS_AND_THIS_FORBIDDEN, THIS_FORBIDDEN):
Define.
2019-01-08 Paolo Carlini <paolo.carlini@oracle.com>
* decl.c (start_decl): Improve permerror location.
2019-01-08 Jonathan Wakely <jwakely@redhat.com>
Jakub Jelinek <jakub@redhat.com>
PR c++/88554
* decl.c (finish_function): For -Wreturn-type don't add a return *this;
fixit hint if current_class_ref is NULL. Use a single if instead of
two nested ones.
2019-01-07 Paolo Carlini <paolo.carlini@oracle.com>
* decl.c (start_decl): Improve two error_at locations.
(expand_static_init): Likewise.
2019-01-07 Marek Polacek <polacek@redhat.com>
PR c++/88741 - wrong error with initializer-string.
* decl.c (cp_complete_array_type): Strip any location wrappers.
2019-01-07 Bernd Edlinger <bernd.edlinger@hotmail.de>
PR c++/88261
PR c++/69338
PR c++/69696
PR c++/69697
* cp-tree.h (LOOKUP_ALLOW_FLEXARRAY_INIT): New flag value.
* typeck2.c (digest_init_r): Raise an error for non-static
initialization of a flexible array member.
(process_init_constructor, massage_init_elt,
process_init_constructor_array, process_init_constructor_record,
process_init_constructor_union, process_init_constructor): Add the
flags parameter and pass it thru.
(store_init_value): Pass LOOKUP_ALLOW_FLEXARRAY_INIT parameter to
digest_init_flags for static decls.
2019-01-07 Jakub Jelinek <jakub@redhat.com>
PR c++/85052
* cp-tree.h (cp_build_vec_convert): Declare.
* parser.c (cp_parser_postfix_expression): Parse
__builtin_convertvector.
* constexpr.c: Include fold-const-call.h.
(cxx_eval_internal_function): Handle IFN_VEC_CONVERT.
(potential_constant_expression_1): Likewise.
* semantics.c (cp_build_vec_convert): New function.
* pt.c (tsubst_copy_and_build): Handle CALL_EXPR to
IFN_VEC_CONVERT.
2019-01-03 Jakub Jelinek <jakub@redhat.com>
PR c++/88636
* decl.c (builtin_function_1): Return result of pushdecl_top_level
or pushdecl rather than decl.
2019-01-03 Paolo Carlini <paolo.carlini@oracle.com>
* tree.c (handle_nodiscard_attribute): Improve warning location.
2019-01-02 Marek Polacek <polacek@redhat.com>
PR c++/88612 - ICE with -Waddress-of-packed-member.
* call.c (convert_for_arg_passing): Only give warnings with tf_warning.
* typeck.c (convert_for_assignment): Likewise.
PR c++/88631 - CTAD failing for value-initialization.
* typeck2.c (build_functional_cast): Try deducing the template
arguments even if there are no arguments to deduce from.
2019-01-01 Jakub Jelinek <jakub@redhat.com>
Update copyright years.
Copyright (C) 2019 Free Software Foundation, Inc.
Copying and distribution of this file, with or without modification,
are permitted in any medium without royalty provided the copyright
notice and this notice are preserved.