diff --git a/rosidl_generator_c/rosidl_generator_c/__init__.py b/rosidl_generator_c/rosidl_generator_c/__init__.py
index 4e4bf76d9..f456027e6 100644
--- a/rosidl_generator_c/rosidl_generator_c/__init__.py
+++ b/rosidl_generator_c/rosidl_generator_c/__init__.py
@@ -62,7 +62,6 @@ def prefix_with_bom_if_necessary(content: str) -> str:
 BASIC_IDL_TYPES_TO_C = {
     'float': 'float',
     'double': 'double',
-    'long double': 'long double',
     'char': 'signed char',
     'wchar': 'uint16_t',
     'boolean': 'bool',
diff --git a/rosidl_generator_cpp/rosidl_generator_cpp/__init__.py b/rosidl_generator_cpp/rosidl_generator_cpp/__init__.py
index 85db597c7..4e01a3b1d 100644
--- a/rosidl_generator_cpp/rosidl_generator_cpp/__init__.py
+++ b/rosidl_generator_cpp/rosidl_generator_cpp/__init__.py
@@ -60,7 +60,6 @@ def prefix_with_bom_if_necessary(content: str) -> str:
     'wchar': 'char16_t',
     'float': 'float',
     'double': 'double',
-    'long double': 'long double',
     'uint8': 'uint8_t',
     'int8': 'int8_t',
     'uint16': 'uint16_t',
@@ -199,7 +198,7 @@ def primitive_value_to_cpp(type_, value):
     if type_.typename in [
         'short', 'unsigned short',
         'char', 'wchar',
-        'double', 'long double',
+        'double',
         'octet',
         'int8', 'uint8',
         'int16', 'uint16',
diff --git a/rosidl_generator_tests/test/rosidl_generator_cpp/test_traits.cpp b/rosidl_generator_tests/test/rosidl_generator_cpp/test_traits.cpp
index 7e16d450c..1ac16cb18 100644
--- a/rosidl_generator_tests/test/rosidl_generator_cpp/test_traits.cpp
+++ b/rosidl_generator_tests/test/rosidl_generator_cpp/test_traits.cpp
@@ -105,10 +105,8 @@ unbounded_sequence_of_wstrings: []
   /*{
     test_msgs::idl::IdlOnlyTypes msg;
     msg.wchar_value = u'ö';
-    msg.long_double_value = 1.125;
     EXPECT_STREQ(
       R"(wchar_value: "\u00f6"
-long_double_value: 1.12500
 )",
       to_yaml(
         msg).c_str());
@@ -116,7 +114,6 @@ long_double_value: 1.12500
     msg.wchar_value = u'貓';
     EXPECT_STREQ(
       R"(wchar_value: "\u8c93"
-long_double_value: 1.12500
 )",
       to_yaml(
         msg).c_str());
diff --git a/rosidl_generator_type_description/rosidl_generator_type_description/__init__.py b/rosidl_generator_type_description/rosidl_generator_type_description/__init__.py
index c62df1787..29e27cbc8 100644
--- a/rosidl_generator_type_description/rosidl_generator_type_description/__init__.py
+++ b/rosidl_generator_type_description/rosidl_generator_type_description/__init__.py
@@ -233,7 +233,6 @@ def parse_rihs_string(rihs_str: str) -> Tuple[int, str]:
     'uint64': 'FIELD_TYPE_UINT64',
     'float': 'FIELD_TYPE_FLOAT',
     'double': 'FIELD_TYPE_DOUBLE',
-    'long': 'LONG_DOUBLE',
     'char': 'FIELD_TYPE_CHAR',
     'wchar': 'FIELD_TYPE_WCHAR',
     'boolean': 'FIELD_TYPE_BOOLEAN',
@@ -272,7 +271,6 @@ def parse_rihs_string(rihs_str: str) -> Tuple[int, str]:
     # Floating-Point Types
     'FIELD_TYPE_FLOAT': 10,
     'FIELD_TYPE_DOUBLE': 11,
-    'FIELD_TYPE_LONG_DOUBLE': 12,
 
     # Char and WChar Types
     'FIELD_TYPE_CHAR': 13,
@@ -308,7 +306,6 @@ def parse_rihs_string(rihs_str: str) -> Tuple[int, str]:
     'FIELD_TYPE_UINT64_ARRAY': 57,
     'FIELD_TYPE_FLOAT_ARRAY': 58,
     'FIELD_TYPE_DOUBLE_ARRAY': 59,
-    'FIELD_TYPE_LONG_DOUBLE_ARRAY': 60,
     'FIELD_TYPE_CHAR_ARRAY': 61,
     'FIELD_TYPE_WCHAR_ARRAY': 62,
     'FIELD_TYPE_BOOLEAN_ARRAY': 63,
@@ -332,7 +329,6 @@ def parse_rihs_string(rihs_str: str) -> Tuple[int, str]:
     'FIELD_TYPE_UINT64_BOUNDED_SEQUENCE': 105,
     'FIELD_TYPE_FLOAT_BOUNDED_SEQUENCE': 106,
     'FIELD_TYPE_DOUBLE_BOUNDED_SEQUENCE': 107,
-    'FIELD_TYPE_LONG_DOUBLE_BOUNDED_SEQUENCE': 108,
     'FIELD_TYPE_CHAR_BOUNDED_SEQUENCE': 109,
     'FIELD_TYPE_WCHAR_BOUNDED_SEQUENCE': 110,
     'FIELD_TYPE_BOOLEAN_BOUNDED_SEQUENCE': 111,
@@ -356,7 +352,6 @@ def parse_rihs_string(rihs_str: str) -> Tuple[int, str]:
     'FIELD_TYPE_UINT64_UNBOUNDED_SEQUENCE': 153,
     'FIELD_TYPE_FLOAT_UNBOUNDED_SEQUENCE': 154,
     'FIELD_TYPE_DOUBLE_UNBOUNDED_SEQUENCE': 155,
-    'FIELD_TYPE_LONG_DOUBLE_UNBOUNDED_SEQUENCE': 156,
     'FIELD_TYPE_CHAR_UNBOUNDED_SEQUENCE': 157,
     'FIELD_TYPE_WCHAR_UNBOUNDED_SEQUENCE': 158,
     'FIELD_TYPE_BOOLEAN_UNBOUNDED_SEQUENCE': 159,
diff --git a/rosidl_parser/rosidl_parser/definition.py b/rosidl_parser/rosidl_parser/definition.py
index 5873ba470..a10426ad1 100644
--- a/rosidl_parser/rosidl_parser/definition.py
+++ b/rosidl_parser/rosidl_parser/definition.py
@@ -46,7 +46,6 @@
 FLOATING_POINT_TYPES: Final = (  # rule (24)
     'float',
     'double',
-    'long double',
 )
 CHARACTER_TYPES: Final = (
     'char',  # rule (34)
@@ -104,7 +103,7 @@
     NonexplicitIntegerTypeValues = Union[SignedNonexplicitIntegerTypeValues,
                                          UnsignedNonexplicitIntegerTypeValues]
 
-    FloatingPointTypeValues = Literal['float', 'double', 'long double']
+    FloatingPointTypeValues = Literal['float', 'double']
     CharacterTypeValues = Literal['char', 'wchar']
     BooleanValue = Literal['boolean']
     OctetValue = Literal['octet']
diff --git a/rosidl_parser/rosidl_parser/grammar.lark b/rosidl_parser/rosidl_parser/grammar.lark
index bb7f7890f..d6f3b074d 100644
--- a/rosidl_parser/rosidl_parser/grammar.lark
+++ b/rosidl_parser/rosidl_parser/grammar.lark
@@ -226,11 +226,9 @@ base_type_spec.2: integer_type
 // (24)
 floating_pt_type.2: floating_pt_type_float
   | floating_pt_type_double
-  | floating_pt_type_long_double
 // separate rules to identify the floating point type
 floating_pt_type_float: "float"
 floating_pt_type_double: "double"
-floating_pt_type_long_double: "long" "double"
 
 // (25)
 integer_type.2: signed_int
diff --git a/rosidl_parser/rosidl_parser/parser.py b/rosidl_parser/rosidl_parser/parser.py
index 399ceee5d..21c664587 100644
--- a/rosidl_parser/rosidl_parser/parser.py
+++ b/rosidl_parser/rosidl_parser/parser.py
@@ -451,7 +451,6 @@ def add_message_members(msg: Message, tree: 'ParseTree') -> None:
 BASE_TYPE_SPEC_TO_IDL_TYPE: Dict[str, 'BasicTypeValues'] = {
     'floating_pt_type_float': 'float',
     'floating_pt_type_double': 'double',
-    'floating_pt_type_long_double': 'long double',
     'char_type': 'char',
     'wide_char_type': 'wchar',
     'boolean_type': 'boolean',
diff --git a/rosidl_parser/test/msg/MyMessage.idl b/rosidl_parser/test/msg/MyMessage.idl
index f2d3cfa61..c03a89a57 100644
--- a/rosidl_parser/test/msg/MyMessage.idl
+++ b/rosidl_parser/test/msg/MyMessage.idl
@@ -28,7 +28,6 @@ module rosidl_parser {
       unsigned long long unsigned_long_long_value;
       float float_value;
       double double_value;
-      long double long_double_value;
       char char_value;
       wchar wchar_value;
       boolean boolean_value;
diff --git a/rosidl_runtime_c/include/rosidl_runtime_c/primitives_sequence.h b/rosidl_runtime_c/include/rosidl_runtime_c/primitives_sequence.h
index 5c152a3c6..d7bc3ddc6 100644
--- a/rosidl_runtime_c/include/rosidl_runtime_c/primitives_sequence.h
+++ b/rosidl_runtime_c/include/rosidl_runtime_c/primitives_sequence.h
@@ -30,7 +30,6 @@
 // sequence types for all basic types
 ROSIDL_RUNTIME_C__PRIMITIVE_SEQUENCE(float, float)
 ROSIDL_RUNTIME_C__PRIMITIVE_SEQUENCE(double, double)
-ROSIDL_RUNTIME_C__PRIMITIVE_SEQUENCE(long_double, long double)
 ROSIDL_RUNTIME_C__PRIMITIVE_SEQUENCE(char, signed char)
 ROSIDL_RUNTIME_C__PRIMITIVE_SEQUENCE(wchar, uint16_t)
 ROSIDL_RUNTIME_C__PRIMITIVE_SEQUENCE(boolean, bool)
diff --git a/rosidl_runtime_c/include/rosidl_runtime_c/primitives_sequence_functions.h b/rosidl_runtime_c/include/rosidl_runtime_c/primitives_sequence_functions.h
index 4f8b1feaf..9a66df8d3 100644
--- a/rosidl_runtime_c/include/rosidl_runtime_c/primitives_sequence_functions.h
+++ b/rosidl_runtime_c/include/rosidl_runtime_c/primitives_sequence_functions.h
@@ -113,7 +113,6 @@ extern "C"
 /**@{*/
 ROSIDL_RUNTIME_C__DECLARE_PRIMITIVE_SEQUENCE_FUNCTIONS(float)
 ROSIDL_RUNTIME_C__DECLARE_PRIMITIVE_SEQUENCE_FUNCTIONS(double)
-ROSIDL_RUNTIME_C__DECLARE_PRIMITIVE_SEQUENCE_FUNCTIONS(long_double)
 ROSIDL_RUNTIME_C__DECLARE_PRIMITIVE_SEQUENCE_FUNCTIONS(char)
 ROSIDL_RUNTIME_C__DECLARE_PRIMITIVE_SEQUENCE_FUNCTIONS(wchar)
 ROSIDL_RUNTIME_C__DECLARE_PRIMITIVE_SEQUENCE_FUNCTIONS(boolean)
diff --git a/rosidl_runtime_c/include/rosidl_runtime_c/type_description/field__functions.h b/rosidl_runtime_c/include/rosidl_runtime_c/type_description/field__functions.h
index 4ae248dd6..d0ded4ae3 100644
--- a/rosidl_runtime_c/include/rosidl_runtime_c/type_description/field__functions.h
+++ b/rosidl_runtime_c/include/rosidl_runtime_c/type_description/field__functions.h
@@ -3,6 +3,9 @@
 // with input from type_description_interfaces:msg/Field.idl
 // generated code does not contain a copyright notice
 
+// IWYU pragma: private, include "type_description_interfaces/msg/field.h"
+
+
 #ifndef ROSIDL_RUNTIME_C__TYPE_DESCRIPTION__FIELD__FUNCTIONS_H_
 #define ROSIDL_RUNTIME_C__TYPE_DESCRIPTION__FIELD__FUNCTIONS_H_
 
@@ -57,7 +60,7 @@ rosidl_runtime_c__type_description__Field__fini(rosidl_runtime_c__type_descripti
  */
 ROSIDL_GENERATOR_C_PUBLIC
 rosidl_runtime_c__type_description__Field *
-rosidl_runtime_c__type_description__Field__create();
+rosidl_runtime_c__type_description__Field__create(void);
 
 /// Destroy msg/Field message.
 /**
diff --git a/rosidl_runtime_c/include/rosidl_runtime_c/type_description/field__struct.h b/rosidl_runtime_c/include/rosidl_runtime_c/type_description/field__struct.h
index 418468f3b..5f5b42164 100644
--- a/rosidl_runtime_c/include/rosidl_runtime_c/type_description/field__struct.h
+++ b/rosidl_runtime_c/include/rosidl_runtime_c/type_description/field__struct.h
@@ -3,6 +3,9 @@
 // with input from type_description_interfaces:msg/Field.idl
 // generated code does not contain a copyright notice
 
+// IWYU pragma: private, include "type_description_interfaces/msg/field.h"
+
+
 #ifndef ROSIDL_RUNTIME_C__TYPE_DESCRIPTION__FIELD__STRUCT_H_
 #define ROSIDL_RUNTIME_C__TYPE_DESCRIPTION__FIELD__STRUCT_H_
 
diff --git a/rosidl_runtime_c/include/rosidl_runtime_c/type_description/field_type__functions.h b/rosidl_runtime_c/include/rosidl_runtime_c/type_description/field_type__functions.h
index 8b05af417..414ca657b 100644
--- a/rosidl_runtime_c/include/rosidl_runtime_c/type_description/field_type__functions.h
+++ b/rosidl_runtime_c/include/rosidl_runtime_c/type_description/field_type__functions.h
@@ -3,6 +3,9 @@
 // with input from type_description_interfaces:msg/FieldType.idl
 // generated code does not contain a copyright notice
 
+// IWYU pragma: private, include "type_description_interfaces/msg/field_type.h"
+
+
 #ifndef ROSIDL_RUNTIME_C__TYPE_DESCRIPTION__FIELD_TYPE__FUNCTIONS_H_
 #define ROSIDL_RUNTIME_C__TYPE_DESCRIPTION__FIELD_TYPE__FUNCTIONS_H_
 
@@ -57,7 +60,7 @@ rosidl_runtime_c__type_description__FieldType__fini(rosidl_runtime_c__type_descr
  */
 ROSIDL_GENERATOR_C_PUBLIC
 rosidl_runtime_c__type_description__FieldType *
-rosidl_runtime_c__type_description__FieldType__create();
+rosidl_runtime_c__type_description__FieldType__create(void);
 
 /// Destroy msg/FieldType message.
 /**
diff --git a/rosidl_runtime_c/include/rosidl_runtime_c/type_description/field_type__struct.h b/rosidl_runtime_c/include/rosidl_runtime_c/type_description/field_type__struct.h
index 012340fb4..2bf113f22 100644
--- a/rosidl_runtime_c/include/rosidl_runtime_c/type_description/field_type__struct.h
+++ b/rosidl_runtime_c/include/rosidl_runtime_c/type_description/field_type__struct.h
@@ -3,6 +3,9 @@
 // with input from type_description_interfaces:msg/FieldType.idl
 // generated code does not contain a copyright notice
 
+// IWYU pragma: private, include "type_description_interfaces/msg/field_type.h"
+
+
 #ifndef ROSIDL_RUNTIME_C__TYPE_DESCRIPTION__FIELD_TYPE__STRUCT_H_
 #define ROSIDL_RUNTIME_C__TYPE_DESCRIPTION__FIELD_TYPE__STRUCT_H_
 
@@ -114,12 +117,6 @@ enum
   rosidl_runtime_c__type_description__FieldType__FIELD_TYPE_DOUBLE = 11
 };
 
-/// Constant 'FIELD_TYPE_LONG_DOUBLE'.
-enum
-{
-  rosidl_runtime_c__type_description__FieldType__FIELD_TYPE_LONG_DOUBLE = 12
-};
-
 /// Constant 'FIELD_TYPE_CHAR'.
 /**
   * Char and WChar Types
@@ -267,12 +264,6 @@ enum
   rosidl_runtime_c__type_description__FieldType__FIELD_TYPE_DOUBLE_ARRAY = 59
 };
 
-/// Constant 'FIELD_TYPE_LONG_DOUBLE_ARRAY'.
-enum
-{
-  rosidl_runtime_c__type_description__FieldType__FIELD_TYPE_LONG_DOUBLE_ARRAY = 60
-};
-
 /// Constant 'FIELD_TYPE_CHAR_ARRAY'.
 enum
 {
@@ -402,12 +393,6 @@ enum
   rosidl_runtime_c__type_description__FieldType__FIELD_TYPE_DOUBLE_BOUNDED_SEQUENCE = 107
 };
 
-/// Constant 'FIELD_TYPE_LONG_DOUBLE_BOUNDED_SEQUENCE'.
-enum
-{
-  rosidl_runtime_c__type_description__FieldType__FIELD_TYPE_LONG_DOUBLE_BOUNDED_SEQUENCE = 108
-};
-
 /// Constant 'FIELD_TYPE_CHAR_BOUNDED_SEQUENCE'.
 enum
 {
@@ -537,12 +522,6 @@ enum
   rosidl_runtime_c__type_description__FieldType__FIELD_TYPE_DOUBLE_UNBOUNDED_SEQUENCE = 155
 };
 
-/// Constant 'FIELD_TYPE_LONG_DOUBLE_UNBOUNDED_SEQUENCE'.
-enum
-{
-  rosidl_runtime_c__type_description__FieldType__FIELD_TYPE_LONG_DOUBLE_UNBOUNDED_SEQUENCE = 156
-};
-
 /// Constant 'FIELD_TYPE_CHAR_UNBOUNDED_SEQUENCE'.
 enum
 {
diff --git a/rosidl_runtime_c/include/rosidl_runtime_c/type_description/individual_type_description__functions.h b/rosidl_runtime_c/include/rosidl_runtime_c/type_description/individual_type_description__functions.h
index eb297b611..3ce8cdf05 100644
--- a/rosidl_runtime_c/include/rosidl_runtime_c/type_description/individual_type_description__functions.h
+++ b/rosidl_runtime_c/include/rosidl_runtime_c/type_description/individual_type_description__functions.h
@@ -3,6 +3,9 @@
 // with input from type_description_interfaces:msg/IndividualTypeDescription.idl
 // generated code does not contain a copyright notice
 
+// IWYU pragma: private, include "type_description_interfaces/msg/individual_type_description.h"
+
+
 #ifndef ROSIDL_RUNTIME_C__TYPE_DESCRIPTION__INDIVIDUAL_TYPE_DESCRIPTION__FUNCTIONS_H_
 #define ROSIDL_RUNTIME_C__TYPE_DESCRIPTION__INDIVIDUAL_TYPE_DESCRIPTION__FUNCTIONS_H_
 
@@ -57,7 +60,7 @@ rosidl_runtime_c__type_description__IndividualTypeDescription__fini(rosidl_runti
  */
 ROSIDL_GENERATOR_C_PUBLIC
 rosidl_runtime_c__type_description__IndividualTypeDescription *
-rosidl_runtime_c__type_description__IndividualTypeDescription__create();
+rosidl_runtime_c__type_description__IndividualTypeDescription__create(void);
 
 /// Destroy msg/IndividualTypeDescription message.
 /**
diff --git a/rosidl_runtime_c/include/rosidl_runtime_c/type_description/individual_type_description__struct.h b/rosidl_runtime_c/include/rosidl_runtime_c/type_description/individual_type_description__struct.h
index 247f22e01..676dfa3d7 100644
--- a/rosidl_runtime_c/include/rosidl_runtime_c/type_description/individual_type_description__struct.h
+++ b/rosidl_runtime_c/include/rosidl_runtime_c/type_description/individual_type_description__struct.h
@@ -3,6 +3,9 @@
 // with input from type_description_interfaces:msg/IndividualTypeDescription.idl
 // generated code does not contain a copyright notice
 
+// IWYU pragma: private, include "type_description_interfaces/msg/individual_type_description.h"
+
+
 #ifndef ROSIDL_RUNTIME_C__TYPE_DESCRIPTION__INDIVIDUAL_TYPE_DESCRIPTION__STRUCT_H_
 #define ROSIDL_RUNTIME_C__TYPE_DESCRIPTION__INDIVIDUAL_TYPE_DESCRIPTION__STRUCT_H_
 
diff --git a/rosidl_runtime_c/include/rosidl_runtime_c/type_description/key_value__functions.h b/rosidl_runtime_c/include/rosidl_runtime_c/type_description/key_value__functions.h
index 61503b9d2..1afb6ef88 100644
--- a/rosidl_runtime_c/include/rosidl_runtime_c/type_description/key_value__functions.h
+++ b/rosidl_runtime_c/include/rosidl_runtime_c/type_description/key_value__functions.h
@@ -3,6 +3,9 @@
 // with input from type_description_interfaces:msg/KeyValue.idl
 // generated code does not contain a copyright notice
 
+// IWYU pragma: private, include "type_description_interfaces/msg/key_value.h"
+
+
 #ifndef ROSIDL_RUNTIME_C__TYPE_DESCRIPTION__KEY_VALUE__FUNCTIONS_H_
 #define ROSIDL_RUNTIME_C__TYPE_DESCRIPTION__KEY_VALUE__FUNCTIONS_H_
 
@@ -57,7 +60,7 @@ rosidl_runtime_c__type_description__KeyValue__fini(rosidl_runtime_c__type_descri
  */
 ROSIDL_GENERATOR_C_PUBLIC
 rosidl_runtime_c__type_description__KeyValue *
-rosidl_runtime_c__type_description__KeyValue__create();
+rosidl_runtime_c__type_description__KeyValue__create(void);
 
 /// Destroy msg/KeyValue message.
 /**
diff --git a/rosidl_runtime_c/include/rosidl_runtime_c/type_description/key_value__struct.h b/rosidl_runtime_c/include/rosidl_runtime_c/type_description/key_value__struct.h
index 7ce5dc83d..8dab48e0f 100644
--- a/rosidl_runtime_c/include/rosidl_runtime_c/type_description/key_value__struct.h
+++ b/rosidl_runtime_c/include/rosidl_runtime_c/type_description/key_value__struct.h
@@ -3,6 +3,9 @@
 // with input from type_description_interfaces:msg/KeyValue.idl
 // generated code does not contain a copyright notice
 
+// IWYU pragma: private, include "type_description_interfaces/msg/key_value.h"
+
+
 #ifndef ROSIDL_RUNTIME_C__TYPE_DESCRIPTION__KEY_VALUE__STRUCT_H_
 #define ROSIDL_RUNTIME_C__TYPE_DESCRIPTION__KEY_VALUE__STRUCT_H_
 
diff --git a/rosidl_runtime_c/include/rosidl_runtime_c/type_description/type_description__functions.h b/rosidl_runtime_c/include/rosidl_runtime_c/type_description/type_description__functions.h
index 384a0ab10..1eca79a44 100644
--- a/rosidl_runtime_c/include/rosidl_runtime_c/type_description/type_description__functions.h
+++ b/rosidl_runtime_c/include/rosidl_runtime_c/type_description/type_description__functions.h
@@ -3,6 +3,9 @@
 // with input from type_description_interfaces:msg/TypeDescription.idl
 // generated code does not contain a copyright notice
 
+// IWYU pragma: private, include "type_description_interfaces/msg/type_description.h"
+
+
 #ifndef ROSIDL_RUNTIME_C__TYPE_DESCRIPTION__TYPE_DESCRIPTION__FUNCTIONS_H_
 #define ROSIDL_RUNTIME_C__TYPE_DESCRIPTION__TYPE_DESCRIPTION__FUNCTIONS_H_
 
@@ -57,7 +60,7 @@ rosidl_runtime_c__type_description__TypeDescription__fini(rosidl_runtime_c__type
  */
 ROSIDL_GENERATOR_C_PUBLIC
 rosidl_runtime_c__type_description__TypeDescription *
-rosidl_runtime_c__type_description__TypeDescription__create();
+rosidl_runtime_c__type_description__TypeDescription__create(void);
 
 /// Destroy msg/TypeDescription message.
 /**
diff --git a/rosidl_runtime_c/include/rosidl_runtime_c/type_description/type_description__struct.h b/rosidl_runtime_c/include/rosidl_runtime_c/type_description/type_description__struct.h
index 49c72939a..176c93e28 100644
--- a/rosidl_runtime_c/include/rosidl_runtime_c/type_description/type_description__struct.h
+++ b/rosidl_runtime_c/include/rosidl_runtime_c/type_description/type_description__struct.h
@@ -3,6 +3,9 @@
 // with input from type_description_interfaces:msg/TypeDescription.idl
 // generated code does not contain a copyright notice
 
+// IWYU pragma: private, include "type_description_interfaces/msg/type_description.h"
+
+
 #ifndef ROSIDL_RUNTIME_C__TYPE_DESCRIPTION__TYPE_DESCRIPTION__STRUCT_H_
 #define ROSIDL_RUNTIME_C__TYPE_DESCRIPTION__TYPE_DESCRIPTION__STRUCT_H_
 
diff --git a/rosidl_runtime_c/include/rosidl_runtime_c/type_description/type_source__functions.h b/rosidl_runtime_c/include/rosidl_runtime_c/type_description/type_source__functions.h
index 49fcfffe8..48599a816 100644
--- a/rosidl_runtime_c/include/rosidl_runtime_c/type_description/type_source__functions.h
+++ b/rosidl_runtime_c/include/rosidl_runtime_c/type_description/type_source__functions.h
@@ -3,6 +3,9 @@
 // with input from type_description_interfaces:msg/TypeSource.idl
 // generated code does not contain a copyright notice
 
+// IWYU pragma: private, include "type_description_interfaces/msg/type_source.h"
+
+
 #ifndef ROSIDL_RUNTIME_C__TYPE_DESCRIPTION__TYPE_SOURCE__FUNCTIONS_H_
 #define ROSIDL_RUNTIME_C__TYPE_DESCRIPTION__TYPE_SOURCE__FUNCTIONS_H_
 
@@ -57,7 +60,7 @@ rosidl_runtime_c__type_description__TypeSource__fini(rosidl_runtime_c__type_desc
  */
 ROSIDL_GENERATOR_C_PUBLIC
 rosidl_runtime_c__type_description__TypeSource *
-rosidl_runtime_c__type_description__TypeSource__create();
+rosidl_runtime_c__type_description__TypeSource__create(void);
 
 /// Destroy msg/TypeSource message.
 /**
diff --git a/rosidl_runtime_c/include/rosidl_runtime_c/type_description/type_source__struct.h b/rosidl_runtime_c/include/rosidl_runtime_c/type_description/type_source__struct.h
index d1e2bc585..17fd0b1ca 100644
--- a/rosidl_runtime_c/include/rosidl_runtime_c/type_description/type_source__struct.h
+++ b/rosidl_runtime_c/include/rosidl_runtime_c/type_description/type_source__struct.h
@@ -3,6 +3,9 @@
 // with input from type_description_interfaces:msg/TypeSource.idl
 // generated code does not contain a copyright notice
 
+// IWYU pragma: private, include "type_description_interfaces/msg/type_source.h"
+
+
 #ifndef ROSIDL_RUNTIME_C__TYPE_DESCRIPTION__TYPE_SOURCE__STRUCT_H_
 #define ROSIDL_RUNTIME_C__TYPE_DESCRIPTION__TYPE_SOURCE__STRUCT_H_
 
diff --git a/rosidl_runtime_c/src/primitives_sequence_functions.c b/rosidl_runtime_c/src/primitives_sequence_functions.c
index c1ef0f0cc..7204b69f5 100644
--- a/rosidl_runtime_c/src/primitives_sequence_functions.c
+++ b/rosidl_runtime_c/src/primitives_sequence_functions.c
@@ -107,7 +107,6 @@
 // array functions for all basic types
 ROSIDL_GENERATOR_C__DEFINE_PRIMITIVE_SEQUENCE_FUNCTIONS(float, float)
 ROSIDL_GENERATOR_C__DEFINE_PRIMITIVE_SEQUENCE_FUNCTIONS(double, double)
-ROSIDL_GENERATOR_C__DEFINE_PRIMITIVE_SEQUENCE_FUNCTIONS(long_double, long double)
 ROSIDL_GENERATOR_C__DEFINE_PRIMITIVE_SEQUENCE_FUNCTIONS(char, signed char)
 ROSIDL_GENERATOR_C__DEFINE_PRIMITIVE_SEQUENCE_FUNCTIONS(wchar, uint16_t)
 ROSIDL_GENERATOR_C__DEFINE_PRIMITIVE_SEQUENCE_FUNCTIONS(boolean, bool)
diff --git a/rosidl_runtime_c/src/type_description/field__description.c b/rosidl_runtime_c/src/type_description/field__description.c
index dcb2aad96..b2dfc5adf 100644
--- a/rosidl_runtime_c/src/type_description/field__description.c
+++ b/rosidl_runtime_c/src/type_description/field__description.c
@@ -143,7 +143,7 @@ rosidl_runtime_c__type_description__Field__get_type_description_sources(
   static bool constructed = false;
   if (!constructed) {
     sources[0] = *rosidl_runtime_c__type_description__Field__get_individual_type_description_source(NULL),
-    sources[0] = *rosidl_runtime_c__type_description__FieldType__get_individual_type_description_source(NULL);
+    sources[1] = *rosidl_runtime_c__type_description__FieldType__get_individual_type_description_source(NULL);
     constructed = true;
   }
   return &source_sequence;
diff --git a/rosidl_runtime_c/src/type_description/field__functions.c b/rosidl_runtime_c/src/type_description/field__functions.c
index 20bcd3a0a..9654bb1fa 100644
--- a/rosidl_runtime_c/src/type_description/field__functions.c
+++ b/rosidl_runtime_c/src/type_description/field__functions.c
@@ -114,7 +114,7 @@ rosidl_runtime_c__type_description__Field__copy(
 }
 
 rosidl_runtime_c__type_description__Field *
-rosidl_runtime_c__type_description__Field__create()
+rosidl_runtime_c__type_description__Field__create(void)
 {
   rcutils_allocator_t allocator = rcutils_get_default_allocator();
   rosidl_runtime_c__type_description__Field * msg = (rosidl_runtime_c__type_description__Field *)allocator.allocate(sizeof(rosidl_runtime_c__type_description__Field), allocator.state);
diff --git a/rosidl_runtime_c/src/type_description/field_type__description.c b/rosidl_runtime_c/src/type_description/field_type__description.c
index 828a95bf1..a0e491ca1 100644
--- a/rosidl_runtime_c/src/type_description/field_type__description.c
+++ b/rosidl_runtime_c/src/type_description/field_type__description.c
@@ -137,7 +137,6 @@ static char toplevel_type_raw_source[] =
   "# Floating-Point Types\n"
   "uint8 FIELD_TYPE_FLOAT = 10\n"
   "uint8 FIELD_TYPE_DOUBLE = 11\n"
-  "uint8 FIELD_TYPE_LONG_DOUBLE = 12\n"
   "\n"
   "# Char and WChar Types\n"
   "uint8 FIELD_TYPE_CHAR = 13\n"
@@ -173,7 +172,6 @@ static char toplevel_type_raw_source[] =
   "uint8 FIELD_TYPE_UINT64_ARRAY = 57\n"
   "uint8 FIELD_TYPE_FLOAT_ARRAY = 58\n"
   "uint8 FIELD_TYPE_DOUBLE_ARRAY = 59\n"
-  "uint8 FIELD_TYPE_LONG_DOUBLE_ARRAY = 60\n"
   "uint8 FIELD_TYPE_CHAR_ARRAY = 61\n"
   "uint8 FIELD_TYPE_WCHAR_ARRAY = 62\n"
   "uint8 FIELD_TYPE_BOOLEAN_ARRAY = 63\n"
@@ -197,7 +195,6 @@ static char toplevel_type_raw_source[] =
   "uint8 FIELD_TYPE_UINT64_BOUNDED_SEQUENCE = 105\n"
   "uint8 FIELD_TYPE_FLOAT_BOUNDED_SEQUENCE = 106\n"
   "uint8 FIELD_TYPE_DOUBLE_BOUNDED_SEQUENCE = 107\n"
-  "uint8 FIELD_TYPE_LONG_DOUBLE_BOUNDED_SEQUENCE = 108\n"
   "uint8 FIELD_TYPE_CHAR_BOUNDED_SEQUENCE = 109\n"
   "uint8 FIELD_TYPE_WCHAR_BOUNDED_SEQUENCE = 110\n"
   "uint8 FIELD_TYPE_BOOLEAN_BOUNDED_SEQUENCE = 111\n"
@@ -221,7 +218,6 @@ static char toplevel_type_raw_source[] =
   "uint8 FIELD_TYPE_UINT64_UNBOUNDED_SEQUENCE = 153\n"
   "uint8 FIELD_TYPE_FLOAT_UNBOUNDED_SEQUENCE = 154\n"
   "uint8 FIELD_TYPE_DOUBLE_UNBOUNDED_SEQUENCE = 155\n"
-  "uint8 FIELD_TYPE_LONG_DOUBLE_UNBOUNDED_SEQUENCE = 156\n"
   "uint8 FIELD_TYPE_CHAR_UNBOUNDED_SEQUENCE = 157\n"
   "uint8 FIELD_TYPE_WCHAR_UNBOUNDED_SEQUENCE = 158\n"
   "uint8 FIELD_TYPE_BOOLEAN_UNBOUNDED_SEQUENCE = 159\n"
@@ -270,7 +266,7 @@ rosidl_runtime_c__type_description__FieldType__get_individual_type_description_s
   static const rosidl_runtime_c__type_description__TypeSource source = {
     {rosidl_runtime_c__type_description__FieldType__TYPE_NAME, 41, 41},
     {msg_encoding, 3, 3},
-    {toplevel_type_raw_source, 6162, 6162},
+    {toplevel_type_raw_source, 5982, 5982},
   };
   return &source;
 }
diff --git a/rosidl_runtime_c/src/type_description/field_type__functions.c b/rosidl_runtime_c/src/type_description/field_type__functions.c
index 99ec8f994..d515991c1 100644
--- a/rosidl_runtime_c/src/type_description/field_type__functions.c
+++ b/rosidl_runtime_c/src/type_description/field_type__functions.c
@@ -98,7 +98,7 @@ rosidl_runtime_c__type_description__FieldType__copy(
 }
 
 rosidl_runtime_c__type_description__FieldType *
-rosidl_runtime_c__type_description__FieldType__create()
+rosidl_runtime_c__type_description__FieldType__create(void)
 {
   rcutils_allocator_t allocator = rcutils_get_default_allocator();
   rosidl_runtime_c__type_description__FieldType * msg = (rosidl_runtime_c__type_description__FieldType *)allocator.allocate(sizeof(rosidl_runtime_c__type_description__FieldType), allocator.state);
diff --git a/rosidl_runtime_c/src/type_description/individual_type_description__description.c b/rosidl_runtime_c/src/type_description/individual_type_description__description.c
index 9d1f9c61d..2636eee94 100644
--- a/rosidl_runtime_c/src/type_description/individual_type_description__description.c
+++ b/rosidl_runtime_c/src/type_description/individual_type_description__description.c
@@ -148,8 +148,8 @@ rosidl_runtime_c__type_description__IndividualTypeDescription__get_type_descript
   static bool constructed = false;
   if (!constructed) {
     sources[0] = *rosidl_runtime_c__type_description__IndividualTypeDescription__get_individual_type_description_source(NULL),
-    sources[0] = *rosidl_runtime_c__type_description__Field__get_individual_type_description_source(NULL);
-    sources[1] = *rosidl_runtime_c__type_description__FieldType__get_individual_type_description_source(NULL);
+    sources[1] = *rosidl_runtime_c__type_description__Field__get_individual_type_description_source(NULL);
+    sources[2] = *rosidl_runtime_c__type_description__FieldType__get_individual_type_description_source(NULL);
     constructed = true;
   }
   return &source_sequence;
diff --git a/rosidl_runtime_c/src/type_description/individual_type_description__functions.c b/rosidl_runtime_c/src/type_description/individual_type_description__functions.c
index 84cb3777b..3a61f6c4f 100644
--- a/rosidl_runtime_c/src/type_description/individual_type_description__functions.c
+++ b/rosidl_runtime_c/src/type_description/individual_type_description__functions.c
@@ -94,7 +94,7 @@ rosidl_runtime_c__type_description__IndividualTypeDescription__copy(
 }
 
 rosidl_runtime_c__type_description__IndividualTypeDescription *
-rosidl_runtime_c__type_description__IndividualTypeDescription__create()
+rosidl_runtime_c__type_description__IndividualTypeDescription__create(void)
 {
   rcutils_allocator_t allocator = rcutils_get_default_allocator();
   rosidl_runtime_c__type_description__IndividualTypeDescription * msg = (rosidl_runtime_c__type_description__IndividualTypeDescription *)allocator.allocate(sizeof(rosidl_runtime_c__type_description__IndividualTypeDescription), allocator.state);
diff --git a/rosidl_runtime_c/src/type_description/key_value__functions.c b/rosidl_runtime_c/src/type_description/key_value__functions.c
index f21ccd424..1767e52ae 100644
--- a/rosidl_runtime_c/src/type_description/key_value__functions.c
+++ b/rosidl_runtime_c/src/type_description/key_value__functions.c
@@ -93,7 +93,7 @@ rosidl_runtime_c__type_description__KeyValue__copy(
 }
 
 rosidl_runtime_c__type_description__KeyValue *
-rosidl_runtime_c__type_description__KeyValue__create()
+rosidl_runtime_c__type_description__KeyValue__create(void)
 {
   rcutils_allocator_t allocator = rcutils_get_default_allocator();
   rosidl_runtime_c__type_description__KeyValue * msg = (rosidl_runtime_c__type_description__KeyValue *)allocator.allocate(sizeof(rosidl_runtime_c__type_description__KeyValue), allocator.state);
diff --git a/rosidl_runtime_c/src/type_description/type_description__description.c b/rosidl_runtime_c/src/type_description/type_description__description.c
index 04a6626cd..0779ffea5 100644
--- a/rosidl_runtime_c/src/type_description/type_description__description.c
+++ b/rosidl_runtime_c/src/type_description/type_description__description.c
@@ -25,8 +25,8 @@ rosidl_runtime_c__type_description__TypeDescription__get_type_hash(
 
 // Include directives for referenced types
 #include "rosidl_runtime_c/type_description/field__functions.h"
-#include "rosidl_runtime_c/type_description/individual_type_description__functions.h"
 #include "rosidl_runtime_c/type_description/field_type__functions.h"
+#include "rosidl_runtime_c/type_description/individual_type_description__functions.h"
 
 // Hashes for external referenced types
 #ifndef NDEBUG
@@ -157,9 +157,9 @@ rosidl_runtime_c__type_description__TypeDescription__get_type_description_source
   static bool constructed = false;
   if (!constructed) {
     sources[0] = *rosidl_runtime_c__type_description__TypeDescription__get_individual_type_description_source(NULL),
-    sources[0] = *rosidl_runtime_c__type_description__Field__get_individual_type_description_source(NULL);
-    sources[1] = *rosidl_runtime_c__type_description__FieldType__get_individual_type_description_source(NULL);
-    sources[2] = *rosidl_runtime_c__type_description__IndividualTypeDescription__get_individual_type_description_source(NULL);
+    sources[1] = *rosidl_runtime_c__type_description__Field__get_individual_type_description_source(NULL);
+    sources[2] = *rosidl_runtime_c__type_description__FieldType__get_individual_type_description_source(NULL);
+    sources[3] = *rosidl_runtime_c__type_description__IndividualTypeDescription__get_individual_type_description_source(NULL);
     constructed = true;
   }
   return &source_sequence;
diff --git a/rosidl_runtime_c/src/type_description/type_description__functions.c b/rosidl_runtime_c/src/type_description/type_description__functions.c
index d3e2d81f9..a9935ae12 100644
--- a/rosidl_runtime_c/src/type_description/type_description__functions.c
+++ b/rosidl_runtime_c/src/type_description/type_description__functions.c
@@ -93,7 +93,7 @@ rosidl_runtime_c__type_description__TypeDescription__copy(
 }
 
 rosidl_runtime_c__type_description__TypeDescription *
-rosidl_runtime_c__type_description__TypeDescription__create()
+rosidl_runtime_c__type_description__TypeDescription__create(void)
 {
   rcutils_allocator_t allocator = rcutils_get_default_allocator();
   rosidl_runtime_c__type_description__TypeDescription * msg = (rosidl_runtime_c__type_description__TypeDescription *)allocator.allocate(sizeof(rosidl_runtime_c__type_description__TypeDescription), allocator.state);
diff --git a/rosidl_runtime_c/src/type_description/type_source__functions.c b/rosidl_runtime_c/src/type_description/type_source__functions.c
index 02a6dc5db..1a2c913fd 100644
--- a/rosidl_runtime_c/src/type_description/type_source__functions.c
+++ b/rosidl_runtime_c/src/type_description/type_source__functions.c
@@ -113,7 +113,7 @@ rosidl_runtime_c__type_description__TypeSource__copy(
 }
 
 rosidl_runtime_c__type_description__TypeSource *
-rosidl_runtime_c__type_description__TypeSource__create()
+rosidl_runtime_c__type_description__TypeSource__create(void)
 {
   rcutils_allocator_t allocator = rcutils_get_default_allocator();
   rosidl_runtime_c__type_description__TypeSource * msg = (rosidl_runtime_c__type_description__TypeSource *)allocator.allocate(sizeof(rosidl_runtime_c__type_description__TypeSource), allocator.state);
diff --git a/rosidl_runtime_c/test/test_primitives_sequence_functions.cpp b/rosidl_runtime_c/test/test_primitives_sequence_functions.cpp
index 93c916a2d..5cc55b060 100644
--- a/rosidl_runtime_c/test/test_primitives_sequence_functions.cpp
+++ b/rosidl_runtime_c/test/test_primitives_sequence_functions.cpp
@@ -102,7 +102,6 @@
 
 TEST_PRIMITIVE_SEQUENCE_FUNCTIONS(float, float)
 TEST_PRIMITIVE_SEQUENCE_FUNCTIONS(double, double)
-TEST_PRIMITIVE_SEQUENCE_FUNCTIONS(long_double, long double)
 TEST_PRIMITIVE_SEQUENCE_FUNCTIONS(char, signed char)
 TEST_PRIMITIVE_SEQUENCE_FUNCTIONS(wchar, uint16_t)
 TEST_PRIMITIVE_SEQUENCE_FUNCTIONS(boolean, bool)
diff --git a/rosidl_runtime_cpp/include/rosidl_runtime_cpp/traits.hpp b/rosidl_runtime_cpp/include/rosidl_runtime_cpp/traits.hpp
index 2d285b7b2..9977f5409 100644
--- a/rosidl_runtime_cpp/include/rosidl_runtime_cpp/traits.hpp
+++ b/rosidl_runtime_cpp/include/rosidl_runtime_cpp/traits.hpp
@@ -59,13 +59,6 @@ inline void value_to_yaml(double value, std::ostream & out)
   out.flags(flags);
 }
 
-inline void value_to_yaml(long double value, std::ostream & out)
-{
-  auto flags = out.flags();
-  out << std::showpoint << value;
-  out.flags(flags);
-}
-
 inline void value_to_yaml(uint8_t value, std::ostream & out)
 {
   out << +value;
diff --git a/rosidl_runtime_cpp/include/rosidl_runtime_cpp/type_description/field__struct.hpp b/rosidl_runtime_cpp/include/rosidl_runtime_cpp/type_description/field__struct.hpp
index 210af6b71..35d01f240 100644
--- a/rosidl_runtime_cpp/include/rosidl_runtime_cpp/type_description/field__struct.hpp
+++ b/rosidl_runtime_cpp/include/rosidl_runtime_cpp/type_description/field__struct.hpp
@@ -3,6 +3,9 @@
 // with input from type_description_interfaces:msg/Field.idl
 // generated code does not contain a copyright notice
 
+// IWYU pragma: private, include "type_description_interfaces/msg/field.hpp"
+
+
 #ifndef ROSIDL_RUNTIME_CPP__TYPE_DESCRIPTION__FIELD__STRUCT_HPP_
 #define ROSIDL_RUNTIME_CPP__TYPE_DESCRIPTION__FIELD__STRUCT_HPP_
 
diff --git a/rosidl_runtime_cpp/include/rosidl_runtime_cpp/type_description/field_type__struct.hpp b/rosidl_runtime_cpp/include/rosidl_runtime_cpp/type_description/field_type__struct.hpp
index 63cb2a55c..642619374 100644
--- a/rosidl_runtime_cpp/include/rosidl_runtime_cpp/type_description/field_type__struct.hpp
+++ b/rosidl_runtime_cpp/include/rosidl_runtime_cpp/type_description/field_type__struct.hpp
@@ -3,6 +3,9 @@
 // with input from type_description_interfaces:msg/FieldType.idl
 // generated code does not contain a copyright notice
 
+// IWYU pragma: private, include "type_description_interfaces/msg/field_type.hpp"
+
+
 #ifndef ROSIDL_RUNTIME_CPP__TYPE_DESCRIPTION__FIELD_TYPE__STRUCT_HPP_
 #define ROSIDL_RUNTIME_CPP__TYPE_DESCRIPTION__FIELD_TYPE__STRUCT_HPP_
 
@@ -142,8 +145,6 @@ struct FieldType_
     10u;
   static constexpr uint8_t FIELD_TYPE_DOUBLE =
     11u;
-  static constexpr uint8_t FIELD_TYPE_LONG_DOUBLE =
-    12u;
   static constexpr uint8_t FIELD_TYPE_CHAR =
     13u;
   static constexpr uint8_t FIELD_TYPE_WCHAR =
@@ -186,8 +187,6 @@ struct FieldType_
     58u;
   static constexpr uint8_t FIELD_TYPE_DOUBLE_ARRAY =
     59u;
-  static constexpr uint8_t FIELD_TYPE_LONG_DOUBLE_ARRAY =
-    60u;
   static constexpr uint8_t FIELD_TYPE_CHAR_ARRAY =
     61u;
   static constexpr uint8_t FIELD_TYPE_WCHAR_ARRAY =
@@ -230,8 +229,6 @@ struct FieldType_
     106u;
   static constexpr uint8_t FIELD_TYPE_DOUBLE_BOUNDED_SEQUENCE =
     107u;
-  static constexpr uint8_t FIELD_TYPE_LONG_DOUBLE_BOUNDED_SEQUENCE =
-    108u;
   static constexpr uint8_t FIELD_TYPE_CHAR_BOUNDED_SEQUENCE =
     109u;
   static constexpr uint8_t FIELD_TYPE_WCHAR_BOUNDED_SEQUENCE =
@@ -274,8 +271,6 @@ struct FieldType_
     154u;
   static constexpr uint8_t FIELD_TYPE_DOUBLE_UNBOUNDED_SEQUENCE =
     155u;
-  static constexpr uint8_t FIELD_TYPE_LONG_DOUBLE_UNBOUNDED_SEQUENCE =
-    156u;
   static constexpr uint8_t FIELD_TYPE_CHAR_UNBOUNDED_SEQUENCE =
     157u;
   static constexpr uint8_t FIELD_TYPE_WCHAR_UNBOUNDED_SEQUENCE =
@@ -362,184 +357,431 @@ using FieldType =
   rosidl_runtime_cpp::type_description::FieldType_<std::allocator<void>>;
 
 // constant definitions
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_NOT_SET;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_NESTED_TYPE;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_INT8;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_UINT8;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_INT16;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_UINT16;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_INT32;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_UINT32;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_INT64;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_UINT64;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_FLOAT;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_DOUBLE;
-template<typename ContainerAllocator>
-constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_LONG_DOUBLE;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_CHAR;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_WCHAR;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_BOOLEAN;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_BYTE;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_STRING;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_WSTRING;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_FIXED_STRING;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_FIXED_WSTRING;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_BOUNDED_STRING;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_BOUNDED_WSTRING;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_NESTED_TYPE_ARRAY;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_INT8_ARRAY;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_UINT8_ARRAY;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_INT16_ARRAY;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_UINT16_ARRAY;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_INT32_ARRAY;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_UINT32_ARRAY;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_INT64_ARRAY;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_UINT64_ARRAY;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_FLOAT_ARRAY;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_DOUBLE_ARRAY;
-template<typename ContainerAllocator>
-constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_LONG_DOUBLE_ARRAY;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_CHAR_ARRAY;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_WCHAR_ARRAY;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_BOOLEAN_ARRAY;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_BYTE_ARRAY;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_STRING_ARRAY;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_WSTRING_ARRAY;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_FIXED_STRING_ARRAY;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_FIXED_WSTRING_ARRAY;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_BOUNDED_STRING_ARRAY;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_BOUNDED_WSTRING_ARRAY;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_NESTED_TYPE_BOUNDED_SEQUENCE;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_INT8_BOUNDED_SEQUENCE;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_UINT8_BOUNDED_SEQUENCE;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_INT16_BOUNDED_SEQUENCE;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_UINT16_BOUNDED_SEQUENCE;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_INT32_BOUNDED_SEQUENCE;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_UINT32_BOUNDED_SEQUENCE;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_INT64_BOUNDED_SEQUENCE;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_UINT64_BOUNDED_SEQUENCE;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_FLOAT_BOUNDED_SEQUENCE;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_DOUBLE_BOUNDED_SEQUENCE;
-template<typename ContainerAllocator>
-constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_LONG_DOUBLE_BOUNDED_SEQUENCE;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_CHAR_BOUNDED_SEQUENCE;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_WCHAR_BOUNDED_SEQUENCE;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_BOOLEAN_BOUNDED_SEQUENCE;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_BYTE_BOUNDED_SEQUENCE;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_STRING_BOUNDED_SEQUENCE;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_WSTRING_BOUNDED_SEQUENCE;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_FIXED_STRING_BOUNDED_SEQUENCE;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_FIXED_WSTRING_BOUNDED_SEQUENCE;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_BOUNDED_STRING_BOUNDED_SEQUENCE;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_BOUNDED_WSTRING_BOUNDED_SEQUENCE;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_NESTED_TYPE_UNBOUNDED_SEQUENCE;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_INT8_UNBOUNDED_SEQUENCE;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_UINT8_UNBOUNDED_SEQUENCE;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_INT16_UNBOUNDED_SEQUENCE;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_UINT16_UNBOUNDED_SEQUENCE;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_INT32_UNBOUNDED_SEQUENCE;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_UINT32_UNBOUNDED_SEQUENCE;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_INT64_UNBOUNDED_SEQUENCE;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_UINT64_UNBOUNDED_SEQUENCE;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_FLOAT_UNBOUNDED_SEQUENCE;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_DOUBLE_UNBOUNDED_SEQUENCE;
-template<typename ContainerAllocator>
-constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_LONG_DOUBLE_UNBOUNDED_SEQUENCE;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_CHAR_UNBOUNDED_SEQUENCE;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_WCHAR_UNBOUNDED_SEQUENCE;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_BOOLEAN_UNBOUNDED_SEQUENCE;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_BYTE_UNBOUNDED_SEQUENCE;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_STRING_UNBOUNDED_SEQUENCE;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_WSTRING_UNBOUNDED_SEQUENCE;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_FIXED_STRING_UNBOUNDED_SEQUENCE;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_FIXED_WSTRING_UNBOUNDED_SEQUENCE;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_BOUNDED_STRING_UNBOUNDED_SEQUENCE;
+#endif  // __cplusplus < 201703L
+#if __cplusplus < 201703L
+// static constexpr member variable definitions are only needed in C++14 and below, deprecated in C++17
 template<typename ContainerAllocator>
 constexpr uint8_t FieldType_<ContainerAllocator>::FIELD_TYPE_BOUNDED_WSTRING_UNBOUNDED_SEQUENCE;
+#endif  // __cplusplus < 201703L
 
 }  // namespace type_description
 
diff --git a/rosidl_runtime_cpp/include/rosidl_runtime_cpp/type_description/individual_type_description__struct.hpp b/rosidl_runtime_cpp/include/rosidl_runtime_cpp/type_description/individual_type_description__struct.hpp
index 890a396b9..40b559dd2 100644
--- a/rosidl_runtime_cpp/include/rosidl_runtime_cpp/type_description/individual_type_description__struct.hpp
+++ b/rosidl_runtime_cpp/include/rosidl_runtime_cpp/type_description/individual_type_description__struct.hpp
@@ -3,6 +3,9 @@
 // with input from type_description_interfaces:msg/IndividualTypeDescription.idl
 // generated code does not contain a copyright notice
 
+// IWYU pragma: private, include "type_description_interfaces/msg/individual_type_description.hpp"
+
+
 #ifndef ROSIDL_RUNTIME_CPP__TYPE_DESCRIPTION__INDIVIDUAL_TYPE_DESCRIPTION__STRUCT_HPP_
 #define ROSIDL_RUNTIME_CPP__TYPE_DESCRIPTION__INDIVIDUAL_TYPE_DESCRIPTION__STRUCT_HPP_
 
diff --git a/rosidl_runtime_cpp/include/rosidl_runtime_cpp/type_description/key_value__struct.hpp b/rosidl_runtime_cpp/include/rosidl_runtime_cpp/type_description/key_value__struct.hpp
index 7cd25f6c1..ce1e2c430 100644
--- a/rosidl_runtime_cpp/include/rosidl_runtime_cpp/type_description/key_value__struct.hpp
+++ b/rosidl_runtime_cpp/include/rosidl_runtime_cpp/type_description/key_value__struct.hpp
@@ -3,6 +3,9 @@
 // with input from type_description_interfaces:msg/KeyValue.idl
 // generated code does not contain a copyright notice
 
+// IWYU pragma: private, include "type_description_interfaces/msg/key_value.hpp"
+
+
 #ifndef ROSIDL_RUNTIME_CPP__TYPE_DESCRIPTION__KEY_VALUE__STRUCT_HPP_
 #define ROSIDL_RUNTIME_CPP__TYPE_DESCRIPTION__KEY_VALUE__STRUCT_HPP_
 
diff --git a/rosidl_runtime_cpp/include/rosidl_runtime_cpp/type_description/type_description__struct.hpp b/rosidl_runtime_cpp/include/rosidl_runtime_cpp/type_description/type_description__struct.hpp
index a56949cd2..3e0b6cb8b 100644
--- a/rosidl_runtime_cpp/include/rosidl_runtime_cpp/type_description/type_description__struct.hpp
+++ b/rosidl_runtime_cpp/include/rosidl_runtime_cpp/type_description/type_description__struct.hpp
@@ -3,6 +3,9 @@
 // with input from type_description_interfaces:msg/TypeDescription.idl
 // generated code does not contain a copyright notice
 
+// IWYU pragma: private, include "type_description_interfaces/msg/type_description.hpp"
+
+
 #ifndef ROSIDL_RUNTIME_CPP__TYPE_DESCRIPTION__TYPE_DESCRIPTION__STRUCT_HPP_
 #define ROSIDL_RUNTIME_CPP__TYPE_DESCRIPTION__TYPE_DESCRIPTION__STRUCT_HPP_
 
diff --git a/rosidl_runtime_cpp/include/rosidl_runtime_cpp/type_description/type_source__struct.hpp b/rosidl_runtime_cpp/include/rosidl_runtime_cpp/type_description/type_source__struct.hpp
index 7ee8385e8..003fedd5a 100644
--- a/rosidl_runtime_cpp/include/rosidl_runtime_cpp/type_description/type_source__struct.hpp
+++ b/rosidl_runtime_cpp/include/rosidl_runtime_cpp/type_description/type_source__struct.hpp
@@ -3,6 +3,9 @@
 // with input from type_description_interfaces:msg/TypeSource.idl
 // generated code does not contain a copyright notice
 
+// IWYU pragma: private, include "type_description_interfaces/msg/type_source.hpp"
+
+
 #ifndef ROSIDL_RUNTIME_CPP__TYPE_DESCRIPTION__TYPE_SOURCE__STRUCT_HPP_
 #define ROSIDL_RUNTIME_CPP__TYPE_DESCRIPTION__TYPE_SOURCE__STRUCT_HPP_
 
diff --git a/rosidl_typesupport_introspection_c/include/rosidl_typesupport_introspection_c/field_types.h b/rosidl_typesupport_introspection_c/include/rosidl_typesupport_introspection_c/field_types.h
index cd336cd3b..0015f374b 100644
--- a/rosidl_typesupport_introspection_c/include/rosidl_typesupport_introspection_c/field_types.h
+++ b/rosidl_typesupport_introspection_c/include/rosidl_typesupport_introspection_c/field_types.h
@@ -31,8 +31,6 @@ enum rosidl_typesupport_introspection_c_field_types
   rosidl_typesupport_introspection_c__ROS_TYPE_FLOAT = 1,
   /// Equivalent to double in C types.
   rosidl_typesupport_introspection_c__ROS_TYPE_DOUBLE = 2,
-  /// Equivalent to long double in C types.
-  rosidl_typesupport_introspection_c__ROS_TYPE_LONG_DOUBLE = 3,
   /// Equivalent to unsigned char in C types.
   rosidl_typesupport_introspection_c__ROS_TYPE_CHAR = 4,
   /// Equivalent to char16_t in C types.
diff --git a/rosidl_typesupport_introspection_cpp/include/rosidl_typesupport_introspection_cpp/field_types.hpp b/rosidl_typesupport_introspection_cpp/include/rosidl_typesupport_introspection_cpp/field_types.hpp
index dc21f61f2..f85296c1f 100644
--- a/rosidl_typesupport_introspection_cpp/include/rosidl_typesupport_introspection_cpp/field_types.hpp
+++ b/rosidl_typesupport_introspection_cpp/include/rosidl_typesupport_introspection_cpp/field_types.hpp
@@ -28,8 +28,6 @@ namespace rosidl_typesupport_introspection_cpp
 const uint8_t ROS_TYPE_FLOAT = rosidl_typesupport_introspection_c__ROS_TYPE_FLOAT;
 /// Equivalent to double in C++ types.
 const uint8_t ROS_TYPE_DOUBLE = rosidl_typesupport_introspection_c__ROS_TYPE_DOUBLE;
-/// Equivalent to long double in C++ types.
-const uint8_t ROS_TYPE_LONG_DOUBLE = rosidl_typesupport_introspection_c__ROS_TYPE_LONG_DOUBLE;
 /// Equivalent to unsigned char in C++ types.
 const uint8_t ROS_TYPE_CHAR = rosidl_typesupport_introspection_c__ROS_TYPE_CHAR;
 /// Equivalent to char16_t in C++ types.
diff --git a/rosidl_typesupport_introspection_tests/include/rosidl_typesupport_introspection_tests/helpers.hpp b/rosidl_typesupport_introspection_tests/include/rosidl_typesupport_introspection_tests/helpers.hpp
index 79d3762ed..378e29720 100644
--- a/rosidl_typesupport_introspection_tests/include/rosidl_typesupport_introspection_tests/helpers.hpp
+++ b/rosidl_typesupport_introspection_tests/include/rosidl_typesupport_introspection_tests/helpers.hpp
@@ -210,7 +210,6 @@ DEFINE_CXX_API_FOR_C_MESSAGE_MEMBER(rosidl_runtime_c__String)
 DEFINE_CXX_API_FOR_C_MESSAGE_MEMBER(rosidl_runtime_c__U16String)
 DEFINE_CXX_API_FOR_C_MESSAGE_SEQUENCE_MEMBER(rosidl_runtime_c__float__Sequence)
 DEFINE_CXX_API_FOR_C_MESSAGE_SEQUENCE_MEMBER(rosidl_runtime_c__double__Sequence)
-DEFINE_CXX_API_FOR_C_MESSAGE_SEQUENCE_MEMBER(rosidl_runtime_c__long_double__Sequence)
 DEFINE_CXX_API_FOR_C_MESSAGE_SEQUENCE_MEMBER(rosidl_runtime_c__char__Sequence)
 DEFINE_CXX_API_FOR_C_MESSAGE_SEQUENCE_MEMBER(rosidl_runtime_c__wchar__Sequence)
 DEFINE_CXX_API_FOR_C_MESSAGE_SEQUENCE_MEMBER(rosidl_runtime_c__boolean__Sequence)
diff --git a/rosidl_typesupport_introspection_tests/include/rosidl_typesupport_introspection_tests/types.hpp b/rosidl_typesupport_introspection_tests/include/rosidl_typesupport_introspection_tests/types.hpp
index 7876e08cf..087c5577d 100644
--- a/rosidl_typesupport_introspection_tests/include/rosidl_typesupport_introspection_tests/types.hpp
+++ b/rosidl_typesupport_introspection_tests/include/rosidl_typesupport_introspection_tests/types.hpp
@@ -27,7 +27,6 @@ namespace rosidl_typesupport_introspection_tests
 // match with their C equivalents.
 using rosidl_typesupport_introspection_cpp::ROS_TYPE_FLOAT;
 using rosidl_typesupport_introspection_cpp::ROS_TYPE_DOUBLE;
-using rosidl_typesupport_introspection_cpp::ROS_TYPE_LONG_DOUBLE;
 using rosidl_typesupport_introspection_cpp::ROS_TYPE_CHAR;
 using rosidl_typesupport_introspection_cpp::ROS_TYPE_WCHAR;
 using rosidl_typesupport_introspection_cpp::ROS_TYPE_BOOLEAN;
diff --git a/scripts/type_description.fingerprint b/scripts/type_description.fingerprint
index c357678d4..6fef2e9b7 100644
--- a/scripts/type_description.fingerprint
+++ b/scripts/type_description.fingerprint
@@ -1,32 +1,32 @@
 # DO NOT EDIT MANUALLY - managed by scripts/copy_type_description_generated_sources.bash
 # INTENTIONALLY CHANGING THIS FILE OUTSIDE THE SCRIPT WILL RESULT IN UNDEFINED BEHAVIOR FOR ALL OF ROS 2 CORE
-SHA256 (rosidl_generator_c/type_description_interfaces/msg/detail/field__struct.h) = 7421637a2fdc6badff265e003b278b1d0a7d00fff978649cf1ea3b8310d6d783
-SHA256 (rosidl_generator_c/type_description_interfaces/msg/detail/field_type__struct.h) = 268f7eba672e58e3aff74819ff5069e3af71a9f5a61889b097c6235e2d31009c
-SHA256 (rosidl_generator_c/type_description_interfaces/msg/detail/individual_type_description__struct.h) = 3fc7cae4450d127d0b84e3aad9894e987372fc49bb75223d95df4ca3184fb163
-SHA256 (rosidl_generator_c/type_description_interfaces/msg/detail/key_value__struct.h) = cf45271cd5edb8763c7be0f1c1beb0662f0084b9fc1dd893bfa668b37024ad96
-SHA256 (rosidl_generator_c/type_description_interfaces/msg/detail/type_description__struct.h) = b5c3f3a5b21325ee0607ffabfd6a41ce3ff8cf636e37bf52526ff1ea7e15b915
-SHA256 (rosidl_generator_c/type_description_interfaces/msg/detail/type_source__struct.h) = 6114c833ebe8bfc48ee4e03fabe1da222e35256ef49b8de7dca80a7d71dab279
-SHA256 (rosidl_generator_c/type_description_interfaces/msg/detail/field__functions.h) = 236841c1ee21672bcc382bf92da64d7575978afffe3cdbd4f56b133cee65c6d1
-SHA256 (rosidl_generator_c/type_description_interfaces/msg/detail/field_type__functions.h) = 5829ddc30a8af7d4567caea1deed2ef91e30c9f8ce193732702caa27b0d9b042
-SHA256 (rosidl_generator_c/type_description_interfaces/msg/detail/individual_type_description__functions.h) = c13ba5bf66f01b719fa186c9d003da26a5a1bcc0a2772b839f2ca1ef0430bdf8
-SHA256 (rosidl_generator_c/type_description_interfaces/msg/detail/key_value__functions.h) = c3e563a96047dcf3bb3f2f3044e48890e1913cb741c4af0478a03c10594e7b46
-SHA256 (rosidl_generator_c/type_description_interfaces/msg/detail/type_description__functions.h) = 8a87c32f052e2b3288ad85f859143b6a29b4ec17ff07acfc98f1f2f55578add9
-SHA256 (rosidl_generator_c/type_description_interfaces/msg/detail/type_source__functions.h) = cf192720c1af20227ec3c9ab5ed113fbbf5d5640276f651c86026f21f0c0c91b
-SHA256 (rosidl_generator_c/type_description_interfaces/msg/detail/field__functions.c) = f88b95cf0f78b0b36ff7c19f7b4bae91b5ca09c5051f43fde0231ac49f72dbbb
-SHA256 (rosidl_generator_c/type_description_interfaces/msg/detail/field_type__functions.c) = bc462cc468f6db949ebcb78a19e864fce8217d06c64f4ce0cc0a12c9c314569c
-SHA256 (rosidl_generator_c/type_description_interfaces/msg/detail/individual_type_description__functions.c) = d0580962fcb537e62c62a837fd98c9063c8882f86af8a07dda8b738786e6ae15
-SHA256 (rosidl_generator_c/type_description_interfaces/msg/detail/key_value__functions.c) = 26c004570511e86490d2fe6fdb52c866264ff6c47e8671052476ca440b2fe705
-SHA256 (rosidl_generator_c/type_description_interfaces/msg/detail/type_description__functions.c) = bfa6460a62d08b9759893f475c4e6e65cd912017ab5e8a984475c13ea94f8018
-SHA256 (rosidl_generator_c/type_description_interfaces/msg/detail/type_source__functions.c) = 710482d1bf1dd5c332f07f1c16e7eb8dd3a9b1badd3f6cd47de19132ae934448
-SHA256 (rosidl_generator_c/type_description_interfaces/msg/detail/field__description.c) = 08c1c4613433c79990a7bc4bc7574cdc1d69a652fe8e2a687dc37c102ea36234
-SHA256 (rosidl_generator_c/type_description_interfaces/msg/detail/field_type__description.c) = 7b234d7686a761e0d9bc79a88e4d1ed6b2efef81f181dfefac2af4456eda55d1
-SHA256 (rosidl_generator_c/type_description_interfaces/msg/detail/individual_type_description__description.c) = 5dc02a2911baf9a041fc89d6a91a01d9f8f4bc0fd6648e56762e36b518e3c0b1
+SHA256 (rosidl_generator_c/type_description_interfaces/msg/detail/field__struct.h) = 4272a7e3354676128d6bffe40b892a61ed9928d3fff5c89a870e4268721b503e
+SHA256 (rosidl_generator_c/type_description_interfaces/msg/detail/field_type__struct.h) = 3c8c65e7207c7d8a75f59597560bc564b5fb3e7b48fec4e4a560b941ffcd7823
+SHA256 (rosidl_generator_c/type_description_interfaces/msg/detail/individual_type_description__struct.h) = 83ee43965dff0902a493044fcb0cc404527fd97cb77d28ff08341cf5926e0bb8
+SHA256 (rosidl_generator_c/type_description_interfaces/msg/detail/key_value__struct.h) = 92b587ecd9949d7720034ac1ca5a2a4834a95e34111e87735ab8b3937a9432ee
+SHA256 (rosidl_generator_c/type_description_interfaces/msg/detail/type_description__struct.h) = 9182ed7c79745fa87f250aa005f9fe43352530c5cc45817ee863235c1bfe9d55
+SHA256 (rosidl_generator_c/type_description_interfaces/msg/detail/type_source__struct.h) = ad068bba7a502cb4151ebddfebeb1a9dd6cf78f52e432354bb950195738ac600
+SHA256 (rosidl_generator_c/type_description_interfaces/msg/detail/field__functions.h) = 5df24e0866de9cb8c6a0a8c6619a6b8edb47d03e8fd78662d3a169bc80ae060a
+SHA256 (rosidl_generator_c/type_description_interfaces/msg/detail/field_type__functions.h) = e68dd0acc4833daa9cbe883b0220e58c1eb478e72186073d36c3698ed4c47419
+SHA256 (rosidl_generator_c/type_description_interfaces/msg/detail/individual_type_description__functions.h) = f698433de3bca61fbaf9731996b3fc543eb8db99de4df816dacf2944614656fa
+SHA256 (rosidl_generator_c/type_description_interfaces/msg/detail/key_value__functions.h) = 20ec10128824342cc2a5fd6d663ee2de259942009212bc5503cfe173aac38686
+SHA256 (rosidl_generator_c/type_description_interfaces/msg/detail/type_description__functions.h) = a5200817bf6c5ae294dacba856119acafbf56401f34ee223fe8360129f1621a4
+SHA256 (rosidl_generator_c/type_description_interfaces/msg/detail/type_source__functions.h) = 01a8a088b03607e80c1627bfc45034f458968c185155c7bc055c00132a85544e
+SHA256 (rosidl_generator_c/type_description_interfaces/msg/detail/field__functions.c) = 5573ee0eb60a70ccd0dbbcb32f9871cbd6ad172911e8322c9f866c3e5be7a98a
+SHA256 (rosidl_generator_c/type_description_interfaces/msg/detail/field_type__functions.c) = 1f76d0898b7ad1fc46d6514bad84ad1a68742ffbc3644cdd67f43b3f2b1705ac
+SHA256 (rosidl_generator_c/type_description_interfaces/msg/detail/individual_type_description__functions.c) = cad1ce46655693b2877db66d56989242570d45ab7c2343fc38a5a6d5945e484d
+SHA256 (rosidl_generator_c/type_description_interfaces/msg/detail/key_value__functions.c) = fd9cd92243287af71b52cffb072be38f8e59e039ec00a2db604e68df5c0eaeb5
+SHA256 (rosidl_generator_c/type_description_interfaces/msg/detail/type_description__functions.c) = ba53a373e4b7161cb9d032ae434268f3b9287169bbcd369be793c6693f94e3b0
+SHA256 (rosidl_generator_c/type_description_interfaces/msg/detail/type_source__functions.c) = f70875da3c3615550f778d62e8bb5001045407d3b3766f7c283b880bee4336d7
+SHA256 (rosidl_generator_c/type_description_interfaces/msg/detail/field__description.c) = 8bf0f85827add8572fcd21d122f751c400ccbd2011bb30b604fd1f3cd9c601d5
+SHA256 (rosidl_generator_c/type_description_interfaces/msg/detail/field_type__description.c) = b1cda30bfae309dd85efc9d3596530d61e4092dabd168b420af681a50c32584d
+SHA256 (rosidl_generator_c/type_description_interfaces/msg/detail/individual_type_description__description.c) = 0842a46e3617279a58537a24404b689e04eb01989364bee52fdef106d92bbf34
 SHA256 (rosidl_generator_c/type_description_interfaces/msg/detail/key_value__description.c) = 052ff1c4a3ae8144dfea1f904e74a540564e71d022fc1d45872ec50579b93a9a
-SHA256 (rosidl_generator_c/type_description_interfaces/msg/detail/type_description__description.c) = 1763518e0c23403f8ad68713c5c3e3b9f8c9588a18a5a16a772458906cab456b
+SHA256 (rosidl_generator_c/type_description_interfaces/msg/detail/type_description__description.c) = 43a173bfcb17da76378ee661e676d5ef62536453d265588806923752de7697c3
 SHA256 (rosidl_generator_c/type_description_interfaces/msg/detail/type_source__description.c) = afc09f4bb4eee00e6bc9e4d266e7322ca27849d2a2b1ab1b92522cc81b92ddcf
-SHA256 (rosidl_generator_cpp/type_description_interfaces/msg/detail/field__struct.hpp) = 95ae3d90f9fbae81a4ffa950fa3ca6e546b8b1f5f853141fc82db40b68be298c
-SHA256 (rosidl_generator_cpp/type_description_interfaces/msg/detail/field_type__struct.hpp) = 4bdc3c22cba31e96ba9d26f667451b9cfe1f683e6f45f4997ad05c3439e4aa46
-SHA256 (rosidl_generator_cpp/type_description_interfaces/msg/detail/individual_type_description__struct.hpp) = eda96246cb0fc9fc42ea861b651b8f2f91326c398c2ebc152fe50194118bfa10
-SHA256 (rosidl_generator_cpp/type_description_interfaces/msg/detail/key_value__struct.hpp) = 82fb90dd4491c00cbea9210aea6df39900d45cdc262c303ba6811fd9362ee50b
-SHA256 (rosidl_generator_cpp/type_description_interfaces/msg/detail/type_description__struct.hpp) = 6c7080681f57b5f86d6564cedebc8032d4e428d134be1241fe3f9d5763f5ede5
-SHA256 (rosidl_generator_cpp/type_description_interfaces/msg/detail/type_source__struct.hpp) = 2768df2e93c46191706edbf58a6ab8550f15392127970b005ab6a8d16650dd8f
+SHA256 (rosidl_generator_cpp/type_description_interfaces/msg/detail/field__struct.hpp) = 2509c7115c2b4d9405eb4d535c87e321f632e8d9d56f4eb923f0eeee1dbcda04
+SHA256 (rosidl_generator_cpp/type_description_interfaces/msg/detail/field_type__struct.hpp) = e7453fea0751aab67f2ee976737213e9cd76f6f6d8e29dd48d86fb738db45adf
+SHA256 (rosidl_generator_cpp/type_description_interfaces/msg/detail/individual_type_description__struct.hpp) = 208fe03593ec9af7d14b436f20c561b5f2c1219b0526bab763504565070d5b5b
+SHA256 (rosidl_generator_cpp/type_description_interfaces/msg/detail/key_value__struct.hpp) = ed9fac215e403c2f642876bc79def54876e93a4f34d1e80abf5370dc5c9403be
+SHA256 (rosidl_generator_cpp/type_description_interfaces/msg/detail/type_description__struct.hpp) = a75ddf96c260b0ff63ebf5ac2f1517c7e8b498cb5d77a66b4ca25f0470738e74
+SHA256 (rosidl_generator_cpp/type_description_interfaces/msg/detail/type_source__struct.hpp) = d07d33e6f78cb913a042f2d13d0b109e5d7ed871aabc814a12f6b6cafe2216ac