any_executor.hpp does not compile with -fno-rtti under gcc

[edtanous]

I found this behavior when upgrading from boost 1.73.0 to boost 1.74.0. The newly created any_executor function relies on typeid explicitly, here

asio/asio/include/asio/execution/any_executor.hpp

Line 810 in be7badc

return typeid(void);

And does not seem to obey the BOOST_NO_TYPEID config flag or the ASIO_NO_TYPEID flag. The specific error when compiling with gcc-10 is:

| ../recipe-sysroot/usr/include/boost/asio/execution/any_executor.hpp: In static member function 'static const std::type_info& boost::asio::execution::detail::any_executor_base::target_type_void()':
| ../recipe-sysroot/usr/include/boost/asio/execution/any_executor.hpp:811:23: error: cannot use 'typeid' with '-fno-rtti'
|   811 |     return typeid(void);

I have very little context about what any_executor does, this just showed up in a #include <asio.hpp> include in a project I was trying to upgrade.

[brunoabinader]

@edtanous I made a patch fix in #541: could you please verify if that works for you?

[edtanous]

Just applied it to my local tree, and seems to resolve the issue. Thanks for the quick turnaround!

[jmog1994]

Hey I just found the same issue trying to import boost 1.74 in a legacy project which uses -fno-rtti I am a bit new here how this patch may be applied to the library it is downloaded...

[chriskohlhoff]

This was fixed in asio 1.18.1 / boost 1.75.