Switch Boost.System to header-only in b2

build.jam

@@ -16,10 +16,9 @@ constant boost_dependencies :
 project /boost/system ;
 
 explicit
-    [ alias boost_system : build//boost_system ]
+    [ alias boost_system : : : : <include>include <library>$(boost_dependencies) ]
     [ alias all : boost_system test ]
     ;
 
 call-if : boost-library system
-    : install boost_system
     ;

build/Jamfile.v2

@@ -1,20 +0,0 @@
-# Boost System Library Build Jamfile
-# Copyright 2002, 2006 Beman Dawes
-# Copyright 2024 Peter Dimov
-# Distributed under the Boost Software License, Version 1.0.
-# https://www.boost.org/LICENSE_1_0.txt
-
-# See library home page at https://www.boost.org/libs/system
-
-project
-    : common-requirements
-      <include>../include
-      <library>$(boost_dependencies)
-      <link>shared:<define>BOOST_SYSTEM_DYN_LINK=1
-      <link>static:<define>BOOST_SYSTEM_STATIC_LINK=1
-      <define>BOOST_SYSTEM_NO_LIB=1
-    ;
-
-SOURCES = error_code ;
-
-lib boost_system : ../src/$(SOURCES).cpp ;

src/error_code.cpp

@@ -1,31 +0,0 @@
-//  error_code stub implementation, for compatibility only
-
-//  Copyright Beman Dawes 2002, 2006
-//  Copyright Peter Dimov 2018
-
-//  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)
-
-//  See library home page at http://www.boost.org/libs/system
-
-//----------------------------------------------------------------------------//
-
-// define BOOST_SYSTEM_SOURCE so that <boost/system/config.hpp> knows
-// the library is being built (possibly exporting rather than importing code)
-#define BOOST_SYSTEM_SOURCE
-
-#include <boost/system/config.hpp>
-
-namespace boost
-{
-
-namespace system
-{
-
-BOOST_SYSTEM_DECL void dummy_exported_function()
-{
-}
-
-} // namespace system
-
-} // namespace boost