Slic3r fails to build against Boost 1.88 due removal of asio::io_service

[onitake]

Describe the bug
asio::io_service was deprecated in Boost 1.66, but it was still available as an alias until Boost 1.87. It was removed in Boost 1.88.
The new name is: asio::io_context

To Reproduce
Steps to reproduce the behavior:

1. Install Boost 1.88
2. Build Slic3r against Boost 1.88
3. Wait for the error:

src/libslic3r/GCodeSender.hpp:40:11: error: ‘io_service’ in namespace 
‘Slic3r::asio’ does not name a type; did you mean ‘use_service’?
   40 |     asio::io_service io;
      |           ^~~~~~~~~~
      |           use_service

3D Model and Slic3r Configuration Export
N/A

Expected behavior
Slic3r should build against Boost 1.88.

Screenshots
N/A

Desktop (please complete the following information):

• OS: Debian Linux sid/forky
• Version 1.3.0

Additional context
This problem was discovered during a rebuild of the Debian package of Slic3r against Boost 1.88: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1110676

A similar issue was reported here: chriskohlhoff/asio#1653
Further information and a link to the asio/boost::asio changelog can be found there.

[sl1pkn07]

need more work than simply change io_service to io_context

src/libslic3r/GCodeSender.cpp: In member function ‘bool Slic3r::GCodeSender::connect(std::string, unsigned int)’:
src/libslic3r/GCodeSender.cpp:102:14: error: ‘class boost::asio::io_context’ has no member named ‘post’
  102 |     this->io.post(boost::bind(&GCodeSender::do_read, this));
      |              ^~~~
src/libslic3r/GCodeSender.cpp: In member function ‘void Slic3r::GCodeSender::disconnect()’:
src/libslic3r/GCodeSender.cpp:162:14: error: ‘class boost::asio::io_context’ has no member named ‘post’
  162 |     this->io.post(boost::bind(&GCodeSender::do_close, this));
      |              ^~~~
src/libslic3r/GCodeSender.cpp:164:14: error: ‘class boost::asio::io_context’ has no member named ‘reset’; did you mean ‘restart’?
  164 |     this->io.reset();
      |              ^~~~~
      |              restart
src/libslic3r/GCodeSender.cpp: In member function ‘void Slic3r::GCodeSender::send()’:
src/libslic3r/GCodeSender.cpp:447:14: error: ‘class boost::asio::io_context’ has no member named ‘post’
  447 |     this->io.post(boost::bind(&GCodeSender::do_send, this));
      |              ^~~~

exist patch for this?

greetings

[sl1pkn07]

maybe like this?

diff --git a/xs/src/libslic3r/GCodeSender.cpp b/xs/src/libslic3r/GCodeSender.cpp
index 5b536031b..556fde109 100644
--- a/xs/src/libslic3r/GCodeSender.cpp
+++ b/xs/src/libslic3r/GCodeSender.cpp
@@ -97,12 +97,12 @@ GCodeSender::connect(std::string devname, unsigned int baud_rate)
     fs.open("serial.txt", std::fstream::out | std::fstream::trunc);
 #endif
     
-    // this gives some work to the io_service before it is started
+    // this gives some work to the io_context before it is started
     // (post() runs the supplied function in its thread)
-    this->io.post(boost::bind(&GCodeSender::do_read, this));
+    boost::asio::post(this->io, [this]() { this->do_read(); });
     
     // start reading in the background thread
-    boost::thread t(boost::bind(&asio::io_service::run, &this->io));
+    boost::thread t(boost::bind(&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 
@@ -159,9 +159,9 @@ GCodeSender::disconnect()
     if (!this->open) return;
     this->open = false;
     this->connected = false;
-    this->io.post(boost::bind(&GCodeSender::do_close, this));
+    boost::asio::post(this->io, [this]() { this->do_read(); });
     this->background_thread.join();
-    this->io.reset();
+    this->io.restart();
     /*
     if (this->error_status()) {
         throw(boost::system::system_error(boost::system::error_code(),
@@ -444,7 +444,7 @@ GCodeSender::send(const std::string &line, bool priority)
 void
 GCodeSender::send()
 {
-    this->io.post(boost::bind(&GCodeSender::do_send, this));
+    boost::asio::post(this->io, [this]() { this->do_send(); });
 }
 
 void
diff --git a/xs/src/libslic3r/GCodeSender.hpp b/xs/src/libslic3r/GCodeSender.hpp
index 8f61a80b2..5b730f31e 100644
--- a/xs/src/libslic3r/GCodeSender.hpp
+++ b/xs/src/libslic3r/GCodeSender.hpp
@@ -47,7 +47,7 @@ class GCodeSender : private boost::noncopyable {
     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;

[TheSlider2]

How is Onlineahmedali still not reported and his content deleted ?

[onitake]

maybe like this?
...

Thank you!
This fixes the Debian package build, and I can confirm that all tests (prove -v -Ilib -Ixs/blib/arch -Ixs/blib/lib t xs/t) succeed.

I'll contact the package maintainer so the patch gets included.
That being said, slic3r is currently blocked because of the CVE reported here: #5162
Please take a look if you can.

[sl1pkn07]

sorry, my skill in this case is out of scope

greetings

[onitake]

@sl1pkn07 We've added your patch to the Debian build: https://salsa.debian.org/3dprinting-team/slic3r/-/blob/boost1.88/debian/patches/Fix-FTBFS-with-boost-1.88.patch?ref_type=heads
Thanks again for contributing it!