if ! $(gPYTHON_INCLUDED)
{
gPYTHON_INCLUDED = true ;

import testing ;
    
# Do some OS-specific setup
if $(NT)
{
    CATENATE = type ;
}
else if $(UNIX)
{
    CATENATE = cat ;
}

PYTHON_VERSION ?= 2.2 ;

# Strip the dot from the Python version in order to be able to name
# libraries
PYTHON_VERSION_NODOT
 = [ MATCH ([0-9]*)\.([0-9]*) : $(PYTHON_VERSION) ]
      ;
PYTHON_VERSION_NODOT = $(PYTHON_VERSION_NODOT:J=) ;

local RUN_PATH = $(RUN_PATH) ;

if $(NT) || ( $(UNIX) && $(OS) = CYGWIN )
{
    PYTHON_WINDOWS = true ;
}

if $(PYTHON_WINDOWS)
{
    # common properties required for compiling any Python module.
    PYTHON_PROPERTIES ?=
      select-nt-python-includes
      <runtime-link>dynamic
      <sysinclude>@boost
      <$(gcc-compilers)><*><define>USE_DL_IMPORT
      ;
    
    CYGWIN_PYTHON_ROOT ?= /usr ;
    if ! $(NT)
    {
        PYTHON_ROOT ?= $(CYGWIN_PYTHON_ROOT) ;
    }
    
    if $(CYGWIN_PYTHON_ROOT) = /usr
    {
        CYGWIN_PYTHON_DLL_PATH ?= /bin ;
    }
    else
    {
        CYGWIN_PYTHON_DLL_PATH ?= $(CYGWIN_PYTHON_ROOT)/bin ;
    }
    CYGWIN_PYTHON_VERSION ?= $(PYTHON_VERSION) ;
    CYGWIN_PYTHON_LIB_PATH ?= $(CYGWIN_PYTHON_ROOT)/lib/python$(CYGWIN_PYTHON_VERSION)/config ;
      
    CYGWIN_PYTHON_DEBUG_VERSION ?= $(CYGWIN_PYTHON_VERSION) ;
    CYGWIN_PYTHON_DEBUG_ROOT ?= /usr/local/pydebug ;
    CYGWIN_PYTHON_DEBUG_DLL_PATH ?= $(CYGWIN_PYTHON_DEBUG_ROOT)/bin ;
    CYGWIN_PYTHON_DEBUG_LIB_PATH ?= $(CYGWIN_PYTHON_DEBUG_ROOT)/lib/python$(CYGWIN_PYTHON_DEBUG_VERSION)/config ;
}
else if $(UNIX) && $(OS) = MACOSX
{
    PYTHON_EMBEDDED_LIBRARY = ;
}
else
{
    PYTHON_EMBEDDED_LIBRARY = python$(PYTHON_VERSION) dl util ;
}


if $(NT)
{
    PYTHON_ROOT ?= c:/tools/python ;
    
    # Reconstitute any paths split due to embedded spaces.
    PYTHON_ROOT = $(PYTHON_ROOT:J=" ") ;
    
    PYTHON_LIB_PATH ?= $(PYTHON_ROOT)/libs [ GLOB $(PYTHON_ROOT) : PCbuild ] ;

    PYTHON_INCLUDES ?= $(PYTHON_ROOT)/include ;
    
    PYTHON_DLL ?= [ GLOB $(PATH) $(Path) : python$(PYTHON_VERSION_NODOT).dll ] ;
    PYTHON_DEBUG_DLL ?= [ GLOB $(PATH) $(Path) : python$(PYTHON_VERSION_NODOT)_d.dll ] ;
    PYTHON_IMPORT_LIB ?= [ GLOB $(PYTHON_LIB_PATH) : libpython$(PYTHON_VERSION_NODOT).* ] ;
    PYTHON_DEBUG_IMPORT_LIB ?= [ GLOB $(PYTHON_LIB_PATH) : libpython$(PYTHON_VERSION_NODOT).* ] ;
}
else if $(UNIX) && $(OS) = MACOSX
{
    if ! $(PYTHON_ROOT)
    {
        if [ GLOB /System/Library/Frameworks : Python.framework ]
        {
            PYTHON_ROOT ?= /System/Library/Frameworks/Python.framework/Versions/$(PYTHON_VERSION) ;
        }
        else
        {
            PYTHON_ROOT ?= /Library/Frameworks/Python.framework/Versions/$(PYTHON_VERSION) ;
        }
    }
    PYTHON_ROOT = $(PYTHON_ROOT:J=" ") ;
    PYTHON_INCLUDES ?= $(PYTHON_ROOT)/include/python$(PYTHON_VERSION) ;
    PYTHON_FRAMEWORK ?= $(PYTHON_ROOT) ;
    while $(PYTHON_FRAMEWORK:D=) != Python.framework
    {
        PYTHON_FRAMEWORK = $(PYTHON_FRAMEWORK:D) ;
    }
    PYTHON_FRAMEWORK = $(PYTHON_FRAMEWORK:D)/Python ;

    PYTHON_PROPERTIES ?=
      <sysinclude>$(PYTHON_INCLUDES)
      ;
}
else if $(UNIX)
{
    PYTHON_ROOT ?= /usr/local ;
    PYTHON_ROOT = $(PYTHON_ROOT:J=" ") ;
    PYTHON_INCLUDES ?= $(PYTHON_ROOT)/include/python$(PYTHON_VERSION) ;
    PYTHON_LIB_PATH ?= $(PYTHON_ROOT)/lib/python$(PYTHON_VERSION)/config ;

    PYTHON_PROPERTIES ?=
      <sysinclude>$(PYTHON_INCLUDES)
        <library-path>$(PYTHON_LIB_PATH)
          <default>python-intel-use-gcc-stdlib
          python-static-multithread
      ;
    
    if $(OS) = OSF
    {
        PYTHON_PROPERTIES += <*><*><linkflags>"-expect_unresolved 'Py*' -expect_unresolved '_Py*'" ;
    }
    else if $(OS) = AIX
    {
        PYTHON_PROPERTIES 
          += <*><*><linkflags>"-Wl,-bI:$(PYTHON_LIB_PATH)/python.exp"
            <*><*><find-library>pthreads ;
    }
}

#
# Locate the python executable(s)
#
CYGWIN_ROOT ?= c:/cygwin ;
{
    for local cyg in "" CYGWIN_
    {
        for local d in "" _D
        {
            local d_D = _DEBUG ;
            local debug = $(d$(d)) ; # "" or _DEBUG

            # select base name of variables
            local var-base = $(cyg)PYTHON$(debug) ; 
            
            # Base defaults for the debug build on the non-debug
            $(var-base)_VERSION ?= $($(cyg)PYTHON_VERSION) ;
            $(var-base)_ROOT ?= $($(cyg)PYTHON_ROOT) ;
            
            # Version number element of executable name
            local exe-version = $($(var-base)_VERSION) ;
            if $(NT) && ! $(cyg) { exe-version = $(d:L) ; }
            
            # assign default target name
            local executable = $(cyg)PYTHON$(d) ;
            $(executable) ?= <$(cyg)EXE$(d)@>python$(exe-version)$(SUFEXE) ;

            # choose the appropriate root directory/ies to search for the target
            local r = $($(var-base)_ROOT) ;
            if $(NT)
            {
                switch $(r)
                {
                    case [/\\]* : # in case of unix-style path
                      r = $(CYGWIN_ROOT)$(r) $(r) ; # re-root for windows
                }
            }
            
            # set up search path
            SEARCH on $($(executable))
              = $(r)/bin           # Standard locations
                $(r)               # Standard locations
                $(r)/PCBuild       # In case building from a windows development Python
                $(RUN_PATH)        # Just look in the path
                ;
        }
    }
}

# Normally on Linux, Python is built with GCC.  A "poor QOI choice" in
# the implementation of the intel tools prevents the use of
# intel-linked shared libs by a GCC-built executable unless they have
# been told to use the GCC runtime.  This rule adds the requisite
# flags to the compile and link lines.
rule python-intel-use-gcc-stdlib ( toolset variant : non-defaults * )
{
    if ( ! $(PYTHON_WINDOWS) )
      && ( ! <define>BOOST_PYTHON_STATIC_LIB in $(non-defaults) )
          && [ MATCH (intel) : $(toolset) ]
    {
        return <stdlib>gcc ;
    }
    else
    {
        return ;
    }
}

# Force statically-linked embedding applications to be multithreaded
# on UNIX.
rule python-static-multithread ( toolset variant : properties * )
{
    if ! $(PYTHON_WINDOWS)
    {
        local x = <define>BOOST_PYTHON_STATIC_LIB <threading>single ;
        if $(x) in $(properties)
        {
            properties = [ difference $(properties) : <threading>single ] <threading>multi ;
        }
    }
    return $(properties) ;
}

# select-python-library
#
# Ungristed elements of a requirements list are treated as the rule
# names to be called to transform the property set. This is used when
# the requirements are too complicated to express otherwise.  This
# rule selects the right python library when building on Windows.
rule select-python-library ( toolset variant : properties * )
{
    if $(PYTHON_WINDOWS) 
    {
        if $(toolset) in $(gcc-compilers)
        {
            if <define>BOOST_DEBUG_PYTHON in $(properties)
            {
                properties += <library-path>$(CYGWIN_PYTHON_DEBUG_LIB_PATH) <find-library>python$(CYGWIN_PYTHON_DEBUG_VERSION).dll ;
            }
            else
            {
                properties += <library-path>$(CYGWIN_PYTHON_LIB_PATH) <find-library>python$(CYGWIN_PYTHON_VERSION).dll ;
            }
        }
        else if [ MATCH .*(mingw).* : $(toolset) ]
        {
            local lib = $(PYTHON_IMPORT_LIB) ;
            if <define>BOOST_DEBUG_PYTHON in $(properties)
            {
                lib = $(PYTHON_DEBUG_IMPORT_LIB) ;
            }
            lib ?= $(PYTHON_DLL) ;
            if <define>BOOST_DEBUG_PYTHON in $(properties)
            {
                lib ?= $(PYTHON_DEBUG_DLL) ;
            }
            properties += <library-file>$(lib) ;
        }
        else 
        {
            properties += <library-path>$(PYTHON_LIB_PATH) ;
            
            if $(toolset) != msvc  # msvc compilers auto-find the python library
            {
                properties += <library-path>$(PYTHON_LIB_PATH) ;
                
                local lib = python$(PYTHON_VERSION_NODOT) ;
                if <define>BOOST_DEBUG_PYTHON in $(properties)
                {
                    lib = python$(PYTHON_VERSION_NODOT)_d ;
                }
                properties += <find-library>$(lib) ;
            } 
        }
    }
    if $(OS) = MACOSX && $(toolset) = darwin
    {
        if <target-type>PYD in $(properties)
        {
            properties += <link-format>bundle ;
        }
        properties += <framework>$(PYTHON_FRAMEWORK) ;
    }
    return $(properties) ;
}

if $(NT)
{
    python-nt-sysinclude = [ GLOB $(PYTHON_ROOT) : PC ] ;
}

rule select-nt-python-includes ( toolset variant : properties * )
{
    if $(toolset) in $(gcc-compilers)
    {
        local d = "" ; 
        if <define>BOOST_DEBUG_PYTHON in $(properties)
        {
            d = DEBUG_ ;
        }
        properties += <sysinclude>$(CYGWIN_PYTHON_$(d)ROOT)/include/python$(CYGWIN_PYTHON_$(d)VERSION) ;
    }
    else
    {
      properties +=
          <sysinclude>$(PYTHON_INCLUDES)
            <sysinclude>$(python-nt-sysinclude) # in case the user is using a source installation
              ;
        
        if ( $(toolset) = cwpro8 ) && ( $(variant) = debug-python )
        {
            properties = [ difference $(properties) : <define>_DEBUG ] ;  #it warns about redefinition otherwise.
        }
        else
        {
            properties += <debug-python><define>_DEBUG ;
        }
    }
    return $(properties) ;
}

PYTHON_PROPERTIES += 
        <sysinclude>@boost
          <stlport-iostream>on
            select-python-library
            ;

BOOST_PYTHON_V2_PROPERTIES 
  = $(PYTHON_PROPERTIES)
    <metrowerks><*><cxxflags>"-inline deferred" 
      <cwpro8><*><cxxflags>"-inline deferred"  # added for internal testing purposes
        <cxx><*><sysinclude>@boost/boost/compatibility/cpp_c_headers
         <define>BOOST_PYTHON_DYNAMIC_LIB
      ;

# Extends the RUN_PATH assignment for targets built under Cygwin so
# that the Python DLL can be found.
rule add-cygwin-python-run-path ( module )
{
    if <define>BOOST_DEBUG_PYTHON in $(gBUILD_PROPERTIES)
    {
        gRUN_LD_LIBRARY_PATH($(module)) += $(CYGWIN_PYTHON_DEBUG_DLL_PATH) ;
    }
    else
    {
        gRUN_LD_LIBRARY_PATH($(module)) += $(CYGWIN_PYTHON_DLL_PATH) ;
    }
}

# This is the generator function for Python modules. It deals with the
# need to change the name of modules compiled with debugging on. This
# is just a wrapper around the generator for shared libraries,
# dll-files.
rule python-files ( module implib ? : sources * )
{
    dll-files $(module) $(implib) : $(sources) : PYD ;

    if $(gCURRENT_TOOLSET) in $(gcc-compilers)
    {
        if $(PYTHON_WINDOWS)
        {
            add-cygwin-python-run-path $(<[-1]) ;
        }
        else
        {
            gRUN_PATH($(module)) += $(GCC_ROOT_DIRECTORY)/lib ;
        }
    }
}

if $(NT)
{
    # Adjust the name of Python modules so that they have the _d
    # suffix when compiled with python debugging enabled.
    gNAME_ADJUST(PYD) = name-adjust-PYD ;

    rule name-adjust-PYD ( pyd implib ? : properties * : toolset variant )
    {
        # Cygwin python is only happy if compiled modules have a .dll
        # extension
        if $(toolset) in $(gcc-compilers)
        {
            pyd = $(pyd:S=.dll) ;
        }
        else if <define>BOOST_DEBUG_PYTHON in $(properties)
        {
            pyd = $(pyd:S=)_d$(pyd:S) ;
        }
        return $(pyd) $(implib) ;
    }
}

rule Link-PYD
{
    if $(UNIX) 
    {
        LINK_LIBPATH on $(<) = [ join $(gRUN_LD_LIBRARY_PATH($(<))) : $(SPLITPATH) ] ;
        
        if $(OS) = AIX
        {
            # explicitly designate the exported init<module> function
            LINKFLAGS on $(<) += "-e init$(<[1]:B)" ; 
            Aix-Implib-Action $(<) : $(>) ;
        }
    }
    gRUN_PYTHONPATH($(<)) += $(gLOCATE($(<[1]))) ;
    .do-link $(<) : $(>) : PYD ;
}

declare-target-type PYD : <shared-linkable>true ;
gGENERATOR_FUNCTION(PYD) = python-files ;
if $(NT)
{
    SUFPYD = .pyd $(SUFDLL[2-]) ;
}
else if $(OS) = MACOSX
{
    SUFPYD = .so $(SUFDLL[2-]) ;
}
else
{
    SUFPYD = $(SUFDLL) ;
}
PYDMODE = $(DLLMODE) ;
SHARED_TYPES += PYD ;

gTARGET_TYPE_ID(pyd) = PYD ;
gIS_DEPENDENCY(PYD) = TRUE ;

# Declare a python extension.
rule extension ( name : sources + : requirements * : default-BUILD * )
{
    requirements += $(BOOST_PYTHON_V2_PROPERTIES) ;
    

    declare-local-target $(name) : $(sources) : $(requirements) : $(default-BUILD) : PYD ;
}

gGENERATOR_FUNCTION(TEST_PYD) = run-test PYD  ;
SUFTEST_PYD = .run ;

declare-build-succeed-test RUN_PYD : TEST_PYD ;

# boost-python-runtest target : python-script sources : requirements : local-build : args
#
# declare a python module test $(<).test which builds when out-of-date
#
# pass --python-test-all on the command-line to force rebuilding
rule boost-python-runtest (
  target : python-script sources + : requirements * : local-build * : args * )
{
    local gRUN_TEST_ARGS = $(args) ;
    local gRUN_TEST_INPUT_FILES = [ FGristFiles $(python-script) ] ;

    # tell Jam that the python script is relative to this directory
    SEARCH on $(gRUN_TEST_INPUT_FILES) = $(SEARCH_SOURCE) ;

    # The user can add additional arguments in PYTHON_TEST_ARGS.
    local gPYTHON_TEST_ARGS = $(args) $(PYTHON_TEST_ARGS) ;
    
    #
    # Stick the names of the python script and source files used in
    # testing into $(source-files) on the main target.  This is kind
    # of a hack, because boost-test will be returning the name of the
    # main target, but unfortunatedly dump-tests runs during the
    # evaluation of boost-test and not during the build phase :(
    #
    local main-target = [ FGristFiles [ expand-target-names $(target) : RUN_PYD ] ] ;
    source-files on $(main-target) = $(gRUN_TEST_INPUT_FILES) ;
    
    local dependencies = [ FGristFiles [ expand-source-names $(sources) ] ] ;
    source-files on $(main-target) += $(gTARGET_SOURCES($(dependencies))) ;
      
    local result = [ 
      boost-test $(sources)
        : RUN_PYD
        : $(requirements)
          <default>python-intel-use-gcc-stdlib # unless otherwise
					       # specified, assume the GCC standard
					       # library is needed for intel
          : $(target)
            : $(local-build)
    ] ;
}

rule boost-python-test ( name : sources + : requirements * : default-BUILD * )
{
    extension $(name) : $(sources) : $(requirements) <suppress>true : $(4) ;
}

# Returns the executable to use for testing a Python module
rule test-executable(PYD) ( target-to-test )
{
    # choose the right python executable
    local python = $(PYTHON) ;
    
    if $(NT)
    {
        local d = "" ;
        if <define>BOOST_DEBUG_PYTHON in $(gBUILD_PROPERTIES)
        {
            d = _D ;
        }

        if $(gCURRENT_TOOLSET) in $(gcc-compilers)
        {
            python = $(CYGWIN_PYTHON$(d)) ;
        }
        else
        {
            python = $(PYTHON$(d)) ;
        }
    }
    
    return $(python) ;
}

rule check-python-config ( )
{
    if ! $(gPYTHON_CONFIG_CHECKED)
    {
        local dir ;
        
        if $(NT) &&  $(TOOLS) in $(gcc-compilers)
        {
            dir =  $(CYGWIN_PYTHON_DEBUG_ROOT) $(CYGWIN_PYTHON_ROOT) ;
            v = $(CYGWIN_PYTHON_DEBUG_VERSION) $(CYGWIN_PYTHON_VERSION) ;
            dir = $(dir)/include/python$(v) ;
            dir = /cygwin/$(dir) $(dir) ;
        }
        dir += $(PYTHON_INCLUDES) ;
          
        # This represents an improvement over the checking that was in
        # Boost 1.28.0, but it is still an imperfect hack. For
        # Boost.Build v2 we will clean up the rules.
        if ! [ GLOB $(dir) : Python.h ]
        {
            gNO_PYTHON_INSTALL = true ;
            ECHO "---------------------------------------------------------------------" ;
            ECHO skipping Boost.Python library build due to missing or incorrect configuration ;
            ECHO ;
            ECHO "couldn't find Python.h in"  \"$(dir:J=" ")\" ;
            ECHO ;
            ECHO You can configure the location of your python installation by setting: ;
            ECHO "PYTHON_ROOT    - currently" \"$(PYTHON_ROOT:J=" ")\" ;
            ECHO "PYTHON_VERSION - The 2-part python Major.Minor version number (e.g." ;
            ECHO "                 \"2.2\", NOT \"2.2.1\")  - currently" \"$(PYTHON_VERSION)\" ;
            ECHO ;
            ECHO "The following are automatically configured from PYTHON_ROOT if not" ;
            ECHO "otherwise set:" ;
            ECHO ;
            ECHO "    PYTHON_LIB_PATH       - path to Python library object; currently" ;
            ECHO "                          \""$(PYTHON_LIB_PATH:J=" ")\" ;
            
            if ! $(NT)
            {
                ECHO "    PYTHON_INCLUDES    - path to Python #include directories; currently" \"$(PYTHON_INCLUDES:J=" ")\" ;
            }
            else if [ intersection $(TOOLS) : $(gcc-compilers) ]
            {
                ECHO ;
                ECHO "    For detailed configuration of Boost.Python for Cygwin GCC" ;
                ECHO "    under Windows NT please see" ;
                ECHO "    http://www.boost.org/libs/python/doc/building.html" ;
            }
            
            ECHO "---------------------------------------------------------------------" ;
        }
        gPYTHON_CONFIG_CHECKED = true ;
    }
    if ! $(gNO_PYTHON_INSTALL)
    {
        return true ;
    }
}

}