From: stuff overlay maintainer
Subject: Build against Boost 1.90 (asio + filesystem)

Boost 1.90 finalized several long-deprecated removals that OrcaSlicer trips over:
  * boost::asio::io_service is gone; switch every type qualification to
    io_context, rename the only io_context::reset() call to restart()
    (renamed back in 1.66), and replace the now-removed
    io_context::post(handler) member with the free function
    boost::asio::post(ctx, handler).
  * resolver::results_type no longer derives publicly from
    basic_resolver_iterator, so endpoints->endpoint() does not
    compile any more; spell it endpoints.begin()->endpoint().
  * boost::filesystem/operations.hpp no longer transitively pulls in
    directory_iterator/directory_entry; include <boost/filesystem/directory.hpp>
    explicitly where directory_iterator is used.

--- a/src/slic3r/Utils/Serial.cpp
+++ b/src/slic3r/Utils/Serial.cpp
@@ -278,11 +278,11 @@
 namespace asio = boost::asio;
 using boost::system::error_code;
 
-Serial::Serial(asio::io_service& io_service) :
+Serial::Serial(asio::io_context& io_service) :
 	asio::serial_port(io_service)
 {}
 
-Serial::Serial(asio::io_service& io_service, const std::string &name, unsigned baud_rate) :
+Serial::Serial(asio::io_context& io_service, const std::string &name, unsigned baud_rate) :
 	asio::serial_port(io_service, name)
 {
 	set_baud_rate(baud_rate);
@@ -398,7 +398,7 @@
 	bool fail = false;
 
 	while (true) {
-		io_service.reset();
+		io_service.restart();
 
 		asio::async_read(*this, boost::asio::buffer(&c, 1), [&](const error_code &read_ec, size_t size) {
 			if (ec || size == 0) {
--- a/src/slic3r/Utils/Serial.hpp
+++ b/src/slic3r/Utils/Serial.hpp
@@ -39,8 +39,8 @@
 class Serial : public boost::asio::serial_port
 {
 public:
-	Serial(boost::asio::io_service &io_service);
-	Serial(boost::asio::io_service &io_service, const std::string &name, unsigned baud_rate);
+	Serial(boost::asio::io_context &io_service);
+	Serial(boost::asio::io_context &io_service, const std::string &name, unsigned baud_rate);
 	Serial(const Serial &) = delete;
 	Serial &operator=(const Serial &) = delete;
 	~Serial();
--- a/src/slic3r/Utils/Bonjour.cpp
+++ b/src/slic3r/Utils/Bonjour.cpp
@@ -620,7 +620,7 @@
 	buffer.resize(DnsMessage::MAX_SIZE);
 }
 
-UdpSocket::UdpSocket( Bonjour::ReplyFn replyfn, const asio::ip::address& multicast_address, const asio::ip::address& interface_address, std::shared_ptr< boost::asio::io_service > io_service)
+UdpSocket::UdpSocket( Bonjour::ReplyFn replyfn, const asio::ip::address& multicast_address, const asio::ip::address& interface_address, std::shared_ptr< boost::asio::io_context > io_service)
 	: replyfn(replyfn)
 	, multicast_address(multicast_address)
 	, socket(*io_service)
@@ -654,7 +654,7 @@
 }
 
 
-UdpSocket::UdpSocket( Bonjour::ReplyFn replyfn, const asio::ip::address& multicast_address, std::shared_ptr< boost::asio::io_service > io_service)
+UdpSocket::UdpSocket( Bonjour::ReplyFn replyfn, const asio::ip::address& multicast_address, std::shared_ptr< boost::asio::io_context > io_service)
 	: replyfn(replyfn)
 	, multicast_address(multicast_address)
 	, socket(*io_service)
@@ -710,7 +710,7 @@
 	// let io_service to handle the datagram on session
 	// from boost documentation io_service::post:
 	// The io_service guarantees that the handler will only be called in a thread in which the run(), run_one(), poll() or poll_one() member functions is currently being invoked.
-	io_service->post(boost::bind(&UdpSession::handle_receive, session, error, bytes));
+	boost::asio::post(*io_service, boost::bind(&UdpSession::handle_receive, session, error, bytes));
 	// immediately accept new datagrams
 	async_receive();
 }
@@ -867,7 +867,7 @@
 {
 	service_dn = (boost::format("_%1%._%2%.local") % service % protocol).str();
 
-	std::shared_ptr< boost::asio::io_service > io_service(new boost::asio::io_service);
+	std::shared_ptr< boost::asio::io_context > io_service(new boost::asio::io_context);
 
 	std::vector<LookupSocket*> sockets;
 
@@ -962,7 +962,7 @@
 			rpls.push_back(reply);
 	};
 
-	std::shared_ptr< boost::asio::io_service > io_service(new boost::asio::io_service);
+	std::shared_ptr< boost::asio::io_context > io_service(new boost::asio::io_context);
 	std::vector<ResolveSocket*> sockets;
 
 	// resolve interfaces - from PR#6646
--- a/src/slic3r/Utils/Bonjour.hpp
+++ b/src/slic3r/Utils/Bonjour.hpp
@@ -151,11 +151,11 @@
 	UdpSocket(Bonjour::ReplyFn replyfn
 		, const boost::asio::ip::address& multicast_address
 		, const boost::asio::ip::address& interface_address
-		, std::shared_ptr< boost::asio::io_service > io_service);
+		, std::shared_ptr< boost::asio::io_context > io_service);
 
 	UdpSocket(Bonjour::ReplyFn replyfn
 		, const boost::asio::ip::address& multicast_address
-		, std::shared_ptr< boost::asio::io_service > io_service);
+		, std::shared_ptr< boost::asio::io_context > io_service);
 
 	void send();
 	void async_receive();
@@ -168,7 +168,7 @@
 	boost::asio::ip::address					    multicast_address;
 	boost::asio::ip::udp::socket					socket;
 	boost::asio::ip::udp::endpoint					mcast_endpoint;
-	std::shared_ptr< boost::asio::io_service >	io_service;
+	std::shared_ptr< boost::asio::io_context >	io_service;
 	std::vector<BonjourRequest>						requests;
 };
 
@@ -182,7 +182,7 @@
 		, Bonjour::ReplyFn replyfn
 		, const boost::asio::ip::address& multicast_address
 		, const boost::asio::ip::address& interface_address
-		, std::shared_ptr< boost::asio::io_service > io_service)
+		, std::shared_ptr< boost::asio::io_context > io_service)
 		: UdpSocket(replyfn, multicast_address, interface_address, io_service)
 		, txt_keys(txt_keys)
 		, service(service)
@@ -199,7 +199,7 @@
 		, std::string protocol
 		, Bonjour::ReplyFn replyfn
 		, const boost::asio::ip::address& multicast_address
-		, std::shared_ptr< boost::asio::io_service > io_service)
+		, std::shared_ptr< boost::asio::io_context > io_service)
 		: UdpSocket(replyfn, multicast_address, io_service)
 		, txt_keys(txt_keys)
 		, service(service)
@@ -237,7 +237,7 @@
 		, Bonjour::ReplyFn replyfn
 		, const boost::asio::ip::address& multicast_address
 		, const boost::asio::ip::address& interface_address
-		, std::shared_ptr< boost::asio::io_service > io_service)
+		, std::shared_ptr< boost::asio::io_context > io_service)
 		: UdpSocket(replyfn, multicast_address, interface_address, io_service)
 		, hostname(hostname)
 
@@ -249,7 +249,7 @@
 	ResolveSocket(const std::string& hostname
 		, Bonjour::ReplyFn replyfn
 		, const boost::asio::ip::address& multicast_address
-		, std::shared_ptr< boost::asio::io_service > io_service)
+		, std::shared_ptr< boost::asio::io_context > io_service)
 		: UdpSocket(replyfn, multicast_address, io_service)
 		, hostname(hostname)
 
--- a/src/slic3r/Utils/TCPConsole.cpp
+++ b/src/slic3r/Utils/TCPConsole.cpp
@@ -170,7 +170,7 @@
 
         auto endpoints = m_resolver.resolve(m_host_name, m_port_name);
 
-        m_socket.async_connect(endpoints->endpoint(),
+        m_socket.async_connect(endpoints.begin()->endpoint(),
             boost::bind(&TCPConsole::handle_connect, this, boost::placeholders::_1)
         );
 
--- a/src/slic3r/GUI/HttpServer.hpp
+++ b/src/slic3r/GUI/HttpServer.hpp
@@ -128,7 +128,7 @@
     {
     public:
         HttpServer&                        server;
-        boost::asio::io_service            io_service;
+        boost::asio::io_context            io_service;
         boost::asio::ip::tcp::acceptor     acceptor;
         std::set<std::shared_ptr<session>> sessions;
 
--- a/src/libslic3r/GCodeSender.hpp
+++ b/src/libslic3r/GCodeSender.hpp
@@ -35,7 +35,7 @@
     void reset();
     
     private:
-    asio::io_service io;
+    asio::io_context io;
     asio::serial_port serial;
     boost::thread background_thread;
     boost::asio::streambuf read_buffer, write_buffer;
--- a/src/libslic3r/GCodeSender.cpp
+++ b/src/libslic3r/GCodeSender.cpp
@@ -107,7 +107,7 @@
     this->io.post(boost::bind(&GCodeSender::do_read, this));
     
     // start reading in the background thread
-    boost::thread t(boost::bind(&boost::asio::io_service::run, &this->io));
+    boost::thread t(boost::bind(&boost::asio::io_context::run, &this->io));
     this->background_thread.swap(t);
     
     // always send a M105 to check for connection because firmware might be silent on connect
--- a/src/slic3r/Config/Version.cpp
+++ b/src/slic3r/Config/Version.cpp
@@ -3,6 +3,7 @@
 #include <cctype>
 
 #include <boost/filesystem/operations.hpp>
+#include <boost/filesystem/directory.hpp>
 #include <boost/nowide/fstream.hpp>
 
 #include "libslic3r/libslic3r.h"