import_mangled fails with clang and std::string

[ivan-mci]

I have a plugin.so file with the following function:

namespace plugin
{
  void InitPlugin(const std::string &path)
  {
  }
}

I am trying to load the function using import_mangled. I am aware that it is experimental.

boost::dll::experimental::smart_library lib("./plugin.so");
typedef void (InitPlugin_t)(const std::string&);
auto initPlugin = boost::dll::experimental::import_mangled<InitPlugin_t>(lib, "plugin::InitPlugin");

This works fine with g++, but fails with clang. Both under Ubuntu 22.04.
plugin.so exports a function named:
plugin::InitPlugin(std::__cxx11::basic_string<char, std::char_traits, std::allocator > const&)

However it looks like import_mangled under clang is looking for a function named:
plugin::InitPlugin(std::basic_string<char, std::char_traits, std::allocator > const&)
Notice that the namespace __cxx11 is missing.

It seems to come from a difference between how __PRETTY_FUNCTION__ is implemented in g++ and clang.