Service generator does not create symbol name for rosidl_typesupport_cpp

[StefanFabian]

Bug report

Required Info:

• Operating System:
  • Ubuntu 20.04
• Installation type:
  • Binary
• Version or commit hash:
  • 1.2.0-1
• DDS implementation:
  • Fast-RTPS
• Client library (if applicable):
  • rclcpp

Steps to reproduce issue

Build a service definition

Expected behavior

There should be a symbol
rosidl_typesupport_cpp__get_service_type_support_handle__[package_name]__srv__[interface_name]

Actual behavior

There is no symbol
rosidl_typesupport_cpp__get_service_type_support_handle__[package_name]__srv__[interface_name]

Additional information

rosidl_typesupport_introspection_cpp contains the following:

#ifdef __cplusplus
extern "C"
{
#endif

ROSIDL_TYPESUPPORT_INTROSPECTION_CPP_PUBLIC
const rosidl_service_type_support_t *
ROSIDL_TYPESUPPORT_INTERFACE__SERVICE_SYMBOL_NAME(rosidl_typesupport_introspection_cpp, example_interfaces, srv, AddTwoInts)() {
  return ::rosidl_typesupport_introspection_cpp::get_service_type_support_handle<example_interfaces::srv::AddTwoInts>();
}

#ifdef __cplusplus
}
#endif

the same should probably be in rosidl_typesupport_cpp but is missing.

I don't know where exactly this is generated, hence, I can't make a PR for this.

[hidmic]

@StefanFabian good catch! The service typesupport symbol is missing from srv__type_support.cpp.em. A bugfix would be most welcome.

[StefanFabian]

I actually did already create PRs to fix this for foxy and galactic.
See #114 and #115.

[StefanFabian]

Any update on what's missing to get these PRs merged? @hidmic
I can't release two large projects until that happens and it's really not a lot of code.
I understand that you guys are busy and have to make sure nothing will break but it's been 9 months since I made that PR.