https://github.com/boostorg/mpi/commit/945de1137b88de6fc0e4dadbc7dca6195087a06d
Fixed up reference to ::boost::mpi::optional<status> to ::boost::optional<status>
so that it matches the 1.92.0 release.

From: "Ivan A. Melnikov" <iv@altlinux.org>
Date: Fri, 14 Aug 2026 14:18:02 +0400
Subject: [PATCH] py_request: Move the operator== definition into the namespace

...to match the declaration in the header.

When built with GCC 15.3.1 on Linux, the mpi python module (mpi.so)
is left with the following symbol undefined:
  _ZN5boost3mpi6pythoneqERKNS1_18request_with_valueES4_
which is unmangled to:
  boost::mpi::python::operator==(boost::mpi::python::request_with_value const&, boost::mpi::python::request_with_value const&)

Indeed, request_with_value.hpp declares the operator as a free function
in boost::mpi::python namespace, while py_request.cpp defines
the operator in the top-level namespace.

Move the definition into the namespace to make sure that declaration
and definition match.

Fixes: 7c6b9c1be2eba1bf65271adee11683d0e9976ff2
Refs: #179
Signed-off-by: Ivan A. Melnikov <iv@altlinux.org>
--- a/libs/mpi/src/python/py_request.cpp
+++ b/libs/mpi/src/python/py_request.cpp
@@ -64,13 +64,13 @@ const object python::request_with_value::wrap_test()
     return object();
 }
 
-bool operator==(python::request_with_value const&, python::request_with_value const&) {
+namespace boost { namespace mpi { namespace python {
+
+bool operator==(request_with_value const&, request_with_value const&) {
   PyErr_SetString(PyExc_NotImplementedError, "mpi requests are not comparable");
   throw error_already_set();
 }
 
-namespace boost { namespace mpi { namespace python {
-  
 const object request_test(request &req)                                         
 {                                                                               
   ::boost::optional<status> stat = req.test();