upgrading to boost v1.81.0; adding unmodified boost library

lib/boost_1.81.0/INSTALL

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+See ./index.html for information about this release. The "Getting Started" 
+section is a useful starting place.
+
+---------------------------
+Copyright Beman Dawes, 2008
+
+Distributed under the Boost Software License, Version 1.0.
+See ./LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt 

lib/boost_1.81.0/Jamroot

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+# Copyright Vladimir Prus 2002-2006.
+# Copyright Dave Abrahams 2005-2006.
+# Copyright Rene Rivera 2005-2007.
+# Copyright Douglas Gregor 2005.
+#
+# 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)
+
+# Usage:
+#
+#   b2 [options] [properties] [install|stage]
+#
+#   Builds and installs Boost.
+#
+# Targets and Related Options:
+#
+#   install                 Install headers and compiled library files to the
+#   =======                 configured locations (below).
+#
+#   --prefix=<PREFIX>       Install architecture independent files here.
+#                           Default: C:\Boost on Windows
+#                           Default: /usr/local on Unix, Linux, etc.
+#
+#   --exec-prefix=<EPREFIX> Install architecture dependent files here.
+#                           Default: <PREFIX>
+#
+#   --libdir=<LIBDIR>       Install library files here.
+#                           Default: <EPREFIX>/lib
+#
+#   --includedir=<HDRDIR>   Install header files here.
+#                           Default: <PREFIX>/include
+#
+#   --cmakedir=<CMAKEDIR>   Install CMake configuration files here.
+#                           Default: <LIBDIR>/cmake
+#
+#   --no-cmake-config       Do not install CMake configuration files.
+#
+#   stage                   Build and install only compiled library files to the
+#   =====                   stage directory.
+#
+#   --stagedir=<STAGEDIR>   Install library files here
+#                           Default: ./stage
+#
+# Other Options:
+#
+#   --build-type=<type>     Build the specified pre-defined set of variations of
+#                           the libraries. Note, that which variants get built
+#                           depends on what each library supports.
+#
+#                               -- minimal -- (default) Builds a minimal set of
+#                               variants. On Windows, these are static
+#                               multithreaded libraries in debug and release
+#                               modes, using shared runtime. On Linux, these are
+#                               static and shared multithreaded libraries in
+#                               release mode.
+#
+#                               -- complete -- Build all possible variations.
+#
+#   --build-dir=DIR         Build in this location instead of building within
+#                           the distribution tree. Recommended!
+#
+#   --show-libraries        Display the list of Boost libraries that require
+#                           build and installation steps, and then exit.
+#
+#   --layout=<layout>       Determine whether to choose library names and header
+#                           locations such that multiple versions of Boost or
+#                           multiple compilers can be used on the same system.
+#
+#                               -- versioned -- Names of boost binaries include
+#                               the Boost version number, name and version of
+#                               the compiler and encoded build properties. Boost
+#                               headers are installed in a subdirectory of
+#                               <HDRDIR> whose name contains the Boost version
+#                               number.
+#
+#                               -- tagged -- Names of boost binaries include the
+#                               encoded build properties such as variant and
+#                               threading, but do not including compiler name
+#                               and version, or Boost version. This option is
+#                               useful if you build several variants of Boost,
+#                               using the same compiler.
+#
+#                               -- system -- Binaries names do not include the
+#                               Boost version number or the name and version
+#                               number of the compiler. Boost headers are
+#                               installed directly into <HDRDIR>. This option is
+#                               intended for system integrators building
+#                               distribution packages.
+#
+#                           The default value is 'versioned' on Windows, and
+#                           'system' on Unix.
+#
+#   --buildid=ID            Add the specified ID to the name of built libraries.
+#                           The default is to not add anything.
+#
+#   --python-buildid=ID     Add the specified ID to the name of built libraries
+#                           that depend on Python. The default is to not add
+#                           anything. This ID is added in addition to --buildid.
+#
+#   --help                  This message.
+#
+#   --with-<library>        Build and install the specified <library>. If this
+#                           option is used, only libraries specified using this
+#                           option will be built.
+#
+#   --without-<library>     Do not build, stage, or install the specified
+#                           <library>. By default, all libraries are built.
+#
+# Properties:
+#
+#   toolset=toolset         Indicate the toolset to build with.
+#
+#   variant=debug|release   Select the build variant
+#
+#   link=static|shared      Whether to build static or shared libraries
+#
+#   threading=single|multi  Whether to build single or multithreaded binaries
+#
+#   runtime-link=static|shared
+#                           Whether to link to static or shared C and C++
+#                           runtime.
+#
+
+# TODO:
+#  - handle boost version
+#  - handle python options such as pydebug
+
+import boostcpp ;
+import package ;
+
+import sequence ;
+import xsltproc ;
+import set ;
+import path ;
+import link ;
+import notfile ;
+import virtual-target ;
+import "class" : new ;
+import property-set ;
+import threadapi-feature ;
+import option ;
+# Backslash because of `bcp --namespace`
+import tools/boost\_install/boost-install ;
+
+path-constant BOOST_ROOT : . ;
+constant BOOST_VERSION : 1.81.0 ;
+constant BOOST_JAMROOT_MODULE : $(__name__) ;
+
+# Allow subprojects to simply `import config : requires ;` to get access to the requires rule
+modules.poke : BOOST_BUILD_PATH : $(BOOST_ROOT)/libs/config/checks [ modules.peek : BOOST_BUILD_PATH ] ;
+
+boostcpp.set-version $(BOOST_VERSION) ;
+
+use-project /boost/architecture : libs/config/checks/architecture ;
+
+local all-headers =
+    [ MATCH .*libs/(.*)/include/boost : [ glob libs/*/include/boost libs/*/*/include/boost ] ] ;
+
+for dir in $(all-headers)
+{
+    link-directory $(dir)-headers : libs/$(dir)/include/boost : <location>. ;
+    explicit $(dir)-headers ;
+}
+
+if $(all-headers)
+{
+    constant BOOST_MODULARLAYOUT : $(all-headers) ;
+}
+
+project boost
+    : requirements <include>.
+
+      [ boostcpp.architecture ]
+      [ boostcpp.address-model ]
+
+      # Disable auto-linking for all targets here, primarily because it caused
+      # troubles with V2.
+      <define>BOOST_ALL_NO_LIB=1
+      # Used to encode variant in target name. See the 'tag' rule below.
+      <tag>@$(__name__).tag
+      <conditional>@handle-static-runtime
+      # Comeau does not support shared lib
+      <toolset>como:<link>static
+      <toolset>como-linux:<define>_GNU_SOURCE=1
+      # When building docs within Boost, we want the standard Boost style
+      <xsl:param>boost.defaults=Boost
+      <conditional>@threadapi-feature.detect
+    : usage-requirements <include>.
+    : default-build
+      <visibility>hidden
+      <threading>multi
+    : build-dir bin.v2
+    ;
+
+# This rule is called by Boost.Build to determine the name of target. We use it
+# to encode the build variant, compiler name and boost version in the target
+# name.
+#
+rule tag ( name : type ? : property-set )
+{
+    return [ boostcpp.tag $(name) : $(type) : $(property-set) ] ;
+}
+
+rule python-tag ( name : type ? : property-set )
+{
+    return [ boostcpp.python-tag $(name) : $(type) : $(property-set) ] ;
+}
+
+rule handle-static-runtime ( properties * )
+{
+    # Using static runtime with shared libraries is impossible on Linux, and
+    # dangerous on Windows. Therefore, we disallow it. This might be drastic,
+    # but it was disabled for a while without anybody complaining.
+
+    local argv = [ modules.peek : ARGV ] ;
+
+    if <link>shared in $(properties)
+        && <runtime-link>static in $(properties)
+        # For CW, static runtime is needed so that std::locale works.
+        && ! ( <toolset>cw in $(properties) )
+        && ! --allow-shared-static in $(argv)
+    {
+        boostcpp.emit-shared-static-warning ;
+        return <build>no ;
+    }
+}
+
+all-libraries = [ MATCH .*libs/(.*)/build/.* : [ glob libs/*/build/Jamfile.v2 ]
+    [ glob libs/*/build/Jamfile ] ] ;
+
+all-libraries = [ sequence.unique $(all-libraries) ] ;
+# The function_types library has a Jamfile, but it's used for maintenance
+# purposes, there's no library to build and install.
+all-libraries = [ set.difference $(all-libraries) : function_types ] ;
+
+# Setup convenient aliases for all libraries.
+
+local rule explicit-alias ( id : targets + )
+{
+    alias $(id) : $(targets) ;
+    explicit $(id) ;
+}
+
+# First, the complicated libraries: where the target name in Jamfile is
+# different from its directory name.
+explicit-alias prg_exec_monitor : libs/test/build//boost_prg_exec_monitor ;
+explicit-alias test_exec_monitor : libs/test/build//boost_test_exec_monitor ;
+explicit-alias unit_test_framework : libs/test/build//boost_unit_test_framework ;
+explicit-alias bgl-vis : libs/graps/build//bgl-vis ;
+explicit-alias serialization : libs/serialization/build//boost_serialization ;
+explicit-alias wserialization : libs/serialization/build//boost_wserialization ;
+for local l in $(all-libraries)
+{
+    if ! $(l) in test graph serialization headers
+    {
+        explicit-alias $(l) : libs/$(l)/build//boost_$(l) ;
+    }
+}
+
+# Log has an additional target
+explicit-alias log_setup : libs/log/build//boost_log_setup ;
+
+rule do-nothing { }
+
+rule generate-alias ( project name : property-set : sources * )
+{
+    local action-name = [ $(property-set).get <action> ] ;
+    local m = [ MATCH ^@(.*) : $(action-name) ] ;
+    property-set = [ property-set.empty ] ;
+    local action = [ new action $(sources) : $(m[1]) : $(property-set) ] ;
+    local t = [ new notfile-target $(name) : $(project) : $(action) ] ;
+    return [ virtual-target.register $(t) ] ;
+}
+
+generate headers : $(all-headers)-headers : <generating-rule>@generate-alias <action>@do-nothing : : <include>.  ;
+
+#alias headers : $(all-headers)-headers : : : <include>.  ;
+explicit headers ;
+
+# Make project ids of all libraries known.
+for local l in $(all-libraries)
+{
+    use-project /boost/$(l) : libs/$(l)/build ;
+}
+
+if [ path.exists $(BOOST_ROOT)/tools/inspect/build ]
+{
+    use-project /boost/tools/inspect : tools/inspect/build ;
+}
+
+if [ path.exists $(BOOST_ROOT)/libs/wave/tool/build ]
+{
+    use-project /boost/libs/wave/tool : libs/wave/tool/build ;
+}
+
+# Make the boost-install rule visible in subprojects
+
+# This rule should be called from libraries' Jamfiles and will create two
+# targets, "install" and "stage", that will install or stage that library. The
+# --prefix option is respected, but --with and --without options, naturally, are
+# ignored.
+#
+# - libraries -- list of library targets to install.
+
+rule boost-install ( libraries * )
+{
+    boost-install.boost-install $(libraries) ;
+}
+
+# Creates a library target, adding autolink support and also creates
+# stage and install targets via boost-install, above.
+rule boost-lib ( name : sources * : requirements * : default-build * : usage-requirements * )
+{
+    autolink = <link>shared:<define>BOOST_$(name:U)_DYN_LINK=1 ;
+    name = boost_$(name) ;
+    lib $(name)
+        : $(sources)
+        : $(requirements) $(autolink)
+        : $(default-build)
+        : $(usage-requirements) $(autolink)
+        ;
+    boost-install $(name) ;
+}
+
+
+# Declare special top-level targets that build and install the desired variants
+# of the libraries.
+boostcpp.declare-targets $(all-libraries) ;

lib/boost_1.81.0/LICENSE_1_0.txt

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+Boost Software License - Version 1.0 - August 17th, 2003
+
+Permission is hereby granted, free of charge, to any person or organization
+obtaining a copy of the software and accompanying documentation covered by
+this license (the "Software") to use, reproduce, display, distribute,
+execute, and transmit the Software, and to prepare derivative works of the
+Software, and to permit third-parties to whom the Software is furnished to
+do so, all subject to the following:
+
+The copyright notices in the Software and this entire statement, including
+the above license grant, this restriction and the following disclaimer,
+must be included in all copies of the Software, in whole or in part, and
+all derivative works of the Software, unless such copies or derivative
+works are solely in the form of machine-executable object code generated by
+a source language processor.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
+SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
+FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.

lib/boost_1.81.0/README.md

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+# Boost C++ Libraries
+
+The Boost project provides free peer-reviewed portable C++ source libraries.
+
+We emphasize libraries that work well with the C++ Standard Library. Boost
+libraries are intended to be widely useful, and usable across a broad spectrum
+of applications. The Boost license encourages both commercial and non-commercial use
+and does not require attribution for binary use. 
+
+The project website is www.boost.org, where you can obtain more information and
+[download](https://www.boost.org/users/download/) the current release.

lib/boost_1.81.0/boost-build.jam

@@ -0,0 +1,17 @@
+# Copyright (C) 2002-2003 David Abrahams.
+# Copyright (C) 2002-2003 Vladimir Prus.
+# Copyright (C) 2003,2007 Rene Rivera.
+# Use, modification and distribution are subject to 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)
+
+#   This is the initial file loaded by Boost Jam when run from any Boost library
+# folder. It allows us to choose which Boost Build installation to use for
+# building Boost libraries. Unless explicitly selected using a command-line
+# option, the version included with the Boost library distribution is used (as
+# opposed to any other Boost Build version installed on the user's sytem).
+
+BOOST_ROOT = $(.boost-build-file:D) ;
+BOOST_BUILD = [ MATCH --boost-build=(.*) : $(ARGV) ] ;
+BOOST_BUILD ?= tools/build/src ;
+boost-build $(BOOST_BUILD) ;