I've encountered the compilation error with this program with boost-libs-1.88.0:

#include <boost/dll/import.hpp>
#include <boost/shared_ptr.hpp>

class API {
public:
       API() { }
};


void x() {
   boost::shared_ptr<API> pluginInterface;
    
   pluginInterface = boost::dll::import_symbol<API>("path", "name");
}

The error:

$ c++ -std=c++20 -c s.cpp -I /usr/local/include/
s.cpp:13:21: error: no viable overloaded '='
  13 |     pluginInterface = boost::dll::import_symbol<API>("path", "name");
     |     ~~~~~~~~~~~~~~~ ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/local/include/boost/smart_ptr/shared_ptr.hpp:407:18: note: candidate function not viable: no known conversion from 'boost::dll::detail::import_type<API>' (aka 'st
d::shared_ptr<API>') to 'const shared_ptr<API>' for 1st argument
 407 |     shared_ptr & operator=( shared_ptr const & r ) noexcept
     |                  ^          ~~~~~~~~~~~~~~~~~~~~

Compiler: clang-19, but gcc-12 fails in a similar way.

It seems that such assignment should work.

This error was originally found in the Dakota project (https://github.com/snl-dakota/dakota).

This error prevents the Dakota project from compiling.

Thanks,

Yuri