Build fails with upcoming Boost 1.87.0 due to Boost Asio removals

[cho-m]

Issue

Build fails with upcoming Boost 1.87.0 (tested beta1, stable release probably in December) due to Boost Asio removal of some deprecated APIs boostorg/asio@a69e0e1.

/tmp/osrm-backend-20241119-79427-bkjo50/include/server/server.hpp:56:46: error: expected ';' after expression
   56 |         boost::asio::ip::tcp::resolver::query query(address, port_string);
      |                                              ^
      |                                              ;
/tmp/osrm-backend-20241119-79427-bkjo50/include/server/server.hpp:56:9: error: no member named 'query' in 'boost::asio::ip::basic_resolver<boost::asio::ip::tcp>'; did you mean 'boost_asio_query_fn::query'?
   56 |         boost::asio::ip::tcp::resolver::query query(address, port_string);
      |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      |         boost_asio_query_fn::query

This has been deprecated since Boost 1.66.0 boostorg/asio@b60e92b. Looking at Boost commit, something like following may work:

@@ -53,8 +53,7 @@ class Server
         const auto port_string = std::to_string(port);

         boost::asio::ip::tcp::resolver resolver(io_context);
-        boost::asio::ip::tcp::resolver::query query(address, port_string);
-        boost::asio::ip::tcp::endpoint endpoint = *resolver.resolve(query);
+        boost::asio::ip::tcp::endpoint endpoint = *resolver.resolve(address, port_string).begin();

         acceptor.open(endpoint.protocol());
 #ifdef SO_REUSEPORT

Steps to reproduce

Please provide the steps required to reproduce your problem.

• Set up Boost 1.87.0-beta1 (https://github.com/boostorg/boost/releases/tag/boost-1.87.0.beta1)
• Build osrm-backend, either master branch or 5.27.1.

Specifications

Please provide details of your development environment.

• Library/dependency versions - Homebrew dependencies
• Operating system - macOS 15 (local), Ubuntu 22.04 (CI)
• Hardware - M1 MacBook Pro (local), GCP e2-standard-8 (CI)