build/src/build-system.jam

#  (C) Copyright David Abrahams 2001-2003. Permission to copy, use,
#  modify, sell and distribute this software is granted provided this
#  copyright notice appears in all copies. This software is provided
#  "as is" without express or implied warranty, and with no claim as
#  to its suitability for any purpose.

# This file is part of Boost.Build version 2.  You can think of it as
# forming the main() routine.  It is invoked by the bootstrapping code
# in bootstrap.jam.
#
# The version of bootstrap.jam invoking this lives in
# tools/build/kernel until BBv1 is retired, so that BBv1 can have its
# bootstrap.jam in this directory.

import project ;
import targets ;
import sequence ;
import modules ;
import feature ;
import property-set ;
import build-request ;
import errors : error ;
import "class" : new ;

import builtin ;
import make ;
import os ;

import version ;

# Check if we can load 'test-config.jam'. If we can, load it and
# ignore user configs.
local test-config = [ GLOB [ modules.peek : BOOST_BUILD_PATH ] : test-config.jam ] ;
if $(test-config)
{
    import test-config ;    
}

if ! $(test-config) && ! --ignore-config in [ modules.peek : ARGV ] 
{    
    module site-config 
    {
        import toolset : using ;
    }

    module user-config 
    {
        import toolset : using ;
    }

    local user-path = [ modules.peek : HOME ] [ modules.peek : BOOST_BUILD_PATH ] ;
    if [ os.name ] in NT CYGWIN
    {    
        modules.load site-config : : [ modules.peek : SystemRoot ] $(user-path) ;
        modules.load user-config : : $(user-path) ;    
    }    
    else
    {
        modules.load site-config : : /etc $(user-path) ;
        modules.load user-config : : $(user-path) ;    
    }
}

if USER_MODULE in [ RULENAMES ]
{
    USER_MODULE site-config user-config ;
}



if --version in [ modules.peek : ARGV ]
{
    version.print ;
    EXIT ;
}

# We always load project in "." so that 'use-project' directives has
# any chance of been seen. Otherwise, we won't be able to refer to
# subprojects using target ids.
current-project = [ project.target [ project.load "." ] ] ;

if ! [ feature.values <toolset> ] 
{
    ECHO "warning: no toolsets are configured." ;
    ECHO "warning: you won't be able to build C++ programs." ;
    ECHO "warning: please consult the documentation." ;
    ECHO ;
}



build-request = [ build-request.from-command-line [ modules.peek : ARGV ] ] ;

properties = [ $(build-request).get-at 2 ] ;

if $(properties) 
{    
    expanded = [ build-request.expand-no-defaults $(properties) ] ;
    local xexpanded ;
    for local e in $(expanded)
    {
        xexpanded += [ property-set.create [ feature.split $(e) ] ] ;
    }
    expanded = $(xexpanded) ;    
}


local target-ids = [ $(build-request).get-at 1 ] ;
local targets
local clean ;


if "--clean" in [ modules.peek : ARGV ]
{
    clean = true ;
}

for local id in $(target-ids)
{
    if $(id) = clean
    {
        clean = true ;
    }
    else
    {
        local t = [ $(current-project).find $(id) ] ;
        if ! $(t)
        {
            error target $(id) does not exist ;
        }
        else
        {
            targets += $(t) ;
        }                
    }    
}

if ! $(targets)
{
    targets += [ project.target [ project.module-name "." ] ] ; 
}

virtual-targets = ;

if $(expanded) 
{        
    for local p in $(expanded)
    {
        for local t in $(targets)
        {   
            local g = [ $(t).generate $(p) ] ;
            virtual-targets += $(g[2-]) ;
        }        
    }
}
else
{
    for local t in $(targets)
    {        
        local g = [ $(t).generate [ property-set.empty ] ] ;
        virtual-targets += $(g[2-]) ;
    }    
}


actual-targets = ;
for t in $(virtual-targets)
{
    actual-targets += [ $(t).actualize ] ;
}
NOTFILE all ;
DEPENDS all : $(actual-targets) ;

if $(clean)
{
    UPDATE clean ;
}
else
{
    UPDATE all ;
}