Make the library modular usable.

build.jam

@@ -0,0 +1,40 @@
+# Copyright René Ferdinand Rivera Morell 2024
+# Distributed under the Boost Software License, Version 1.0.
+# (See accompanying file LICENSE_1_0.txt or copy at
+# http://www.boost.org/LICENSE_1_0.txt)
+
+import project ;
+
+project /boost/mpi
+    : common-requirements
+        <source>/boost/assert//boost_assert
+        <source>/boost/config//boost_config
+        <source>/boost/core//boost_core
+        <source>/boost/foreach//boost_foreach
+        <source>/boost/function//boost_function
+        <source>/boost/graph//boost_graph
+        <source>/boost/integer//boost_integer
+        <source>/boost/iterator//boost_iterator
+        <source>/boost/lexical_cast//boost_lexical_cast
+        <source>/boost/mpl//boost_mpl
+        <source>/boost/optional//boost_optional
+        <source>/boost/python//boost_python
+        <source>/boost/serialization//boost_serialization
+        <source>/boost/smart_ptr//boost_smart_ptr
+        <source>/boost/static_assert//boost_static_assert
+        <source>/boost/throw_exception//boost_throw_exception
+        <source>/boost/type_traits//boost_type_traits
+        <source>/boost/utility//boost_utility
+        <include>include
+    ;
+
+explicit
+    [ alias boost_mpi : build//boost_mpi ]
+    [ alias boost_mpi_python : build//boost_mpi_python ]
+    [ alias mpi : build//mpi ]
+    [ alias all : boost_mpi boost_mpi_python mpi test ]
+    ;
+
+call-if : boost-library mpi
+    : install boost_mpi boost_mpi_python mpi
+    ;

build/Jamfile.v2

@@ -15,19 +15,18 @@ import python ;
 import option ;
 import regex ;
 
-#
-# The `version-suffix` rule really belongs into python.jam, and
-# should be moved there. `split-version` is only duplicated here
-# as a prerequisite. (See https://github.com/boostorg/build/pull/290)
-#
-
-
-mpi_python_libs = ;
+rule tag ( name : type ? : property-set )
+{
+    if python-tag in [ RULENAMES $(__name__) ]
+    {
+        return [  $(__name__).python-tag $(name) : $(type) : $(property-set) ] ;
+    }
+}
 
 if [ mpi.configured ]
 {
 
-project boost/mpi
+project
   : source-location ../src
   ;
 
@@ -57,7 +56,7 @@ lib boost_mpi
     text_skeleton_oarchive.cpp
     timer.cpp
   : # Requirements
-    <library>../../serialization/build//boost_serialization
+    <library>/boost/serialization//boost_serialization
     <library>/mpi//mpi [ mpi.extra-requirements ]
     <define>BOOST_MPI_SOURCE=1
     <link>shared:<define>BOOST_MPI_DYN_LINK=1
@@ -65,12 +64,12 @@ lib boost_mpi
   : # Default build
     <link>shared
   : # Usage requirements
-    <library>../../serialization/build//boost_serialization
+    <library>/boost/serialization//boost_serialization
     <library>/mpi//mpi [ mpi.extra-requirements ]
   ;
 
-  if [ python.configured ]
-  {
+    if [ python.configured ]
+    {
             lib boost_mpi_python
               : # Sources
                 python/serialize.cpp
@@ -84,8 +83,8 @@ lib boost_mpi
                 <link>shared:<define>BOOST_PYTHON_DYN_LINK=1
                 <define>BOOST_MPI_PYTHON_SOURCE=1
                 <python-debugging>on:<define>BOOST_DEBUG_PYTHON
-                -<tag>@$(BOOST_JAMROOT_MODULE)%$(BOOST_JAMROOT_MODULE).tag
-                <tag>@python-tag
+                -<tag>@%boostcpp.tag
+                <tag>@tag
                 <conditional>@python.require-py
                 <local-visibility>global
 
@@ -93,6 +92,7 @@ lib boost_mpi
                 <link>shared
               : # Usage requirements
                 <library>/mpi//mpi [ mpi.extra-requirements ]
+                <library>/python//python
               ;
 
             python-extension mpi
@@ -120,22 +120,25 @@ lib boost_mpi
                 <link>shared <runtime-link>shared
                 <python-debugging>on:<define>BOOST_DEBUG_PYTHON
               ;
-
-            mpi_python_libs = boost_mpi_python mpi ;
-  }
-}
-else if ! ( --without-mpi in  [ modules.peek : ARGV ] )
-{
-  message boost_mpi   
-      : "warning: skipping optional Message Passing Interface (MPI) library."
-      : "note: to enable MPI support, add \"using mpi ;\" to user-config.jam."
-      : "note: to suppress this message, pass \"--without-mpi\" to bjam."
-      : "note: otherwise, you can safely ignore this message." 
-      ;
+    }
+    else
+    {
+        alias boost_mpi_python ;
+        alias mpi ;
+    }
 }
 else
 {
-  alias boost_mpi ;
+    if ! ( --without-mpi in  [ modules.peek : ARGV ] )
+    {
+        message boost_mpi
+            : "warning: skipping optional Message Passing Interface (MPI) library."
+            : "note: to enable MPI support, add \"using mpi ;\" to user-config.jam."
+            : "note: to suppress this message, pass \"--without-mpi\" to b2."
+            : "note: otherwise, you can safely ignore this message." 
+            ;
+    }
+    alias boost_mpi_python ;
+    alias mpi ;
+    alias boost_mpi ;
 }
-
-boost-install boost_mpi $(mpi_python_libs) ;

test/Jamfile.v2

@@ -9,9 +9,15 @@
 # Authors: Douglas Gregor
 #          Andrew Lumsdaine
 
-project : requirements <library>/boost//mpi ;
 import mpi : mpi-test ;
 
+project : requirements
+    <source>/boost/test//boost_test
+    <source>/boost/mpi//boost_mpi
+    <source>/boost/mpi//boost_mpi_python
+    <mpi.run-flags>--oversubscribe
+    ;
+
 if [ mpi.configured ]
 {
 test-suite mpi