1# Status: mostly ported. Missing is --out-xml support, 'configure' integration
2# and some FIXME.
3# Base revision: 64351
4
5# Copyright 2003, 2005 Dave Abrahams
6# Copyright 2006 Rene Rivera
7# Copyright 2003, 2004, 2005, 2006, 2007 Vladimir Prus
8# Distributed under the Boost Software License, Version 1.0.
9# (See accompanying file LICENSE_1_0.txt or copy at
10# http://www.boost.org/LICENSE_1_0.txt)
11
12
13from b2.build.engine import Engine
14from b2.manager import Manager
15from b2.util.path import glob
16from b2.build import feature, property_set
17import b2.build.virtual_target
18from b2.build.targets import ProjectTarget
19from b2.util.sequence import unique
20import b2.build.build_request
21from b2.build.errors import ExceptionWithUserContext
22import b2.tools.common
23from b2.build.toolset import using
24
25import b2.build.project as project
26import b2.build.virtual_target as virtual_target
27import b2.build.build_request as build_request
28
29import b2.util.regex
30
31from b2.manager import get_manager
32from b2.util import cached
33from b2.util import option
34
35
36import bjam
37
38import os
39import sys
40import re
41
42################################################################################
43#
44# Module global data.
45#
46################################################################################
47
48# Flag indicating we should display additional debugging information related to
49# locating and loading Boost Build configuration files.
50debug_config = False
51
52# The cleaning is tricky. Say, if user says 'bjam --clean foo' where 'foo' is a
53# directory, then we want to clean targets which are in 'foo' as well as those
54# in any children Jamfiles under foo but not in any unrelated Jamfiles. To
55# achieve this we collect a list of projects under which cleaning is allowed.
56project_targets = []
57
58# Virtual targets obtained when building main targets references on the command
59# line. When running 'bjam --clean main_target' we want to clean only files
60# belonging to that main target so we need to record which targets are produced
61# for it.
62results_of_main_targets = []
63
64# Was an XML dump requested?
65out_xml = False
66
67# Default toolset & version to be used in case no other toolset has been used
68# explicitly by either the loaded configuration files, the loaded project build
69# scripts or an explicit toolset request on the command line. If not specified,
70# an arbitrary default will be used based on the current host OS. This value,
71# while not strictly necessary, has been added to allow testing Boost-Build's
72# default toolset usage functionality.
73default_toolset = None
74default_toolset_version = None
75
76################################################################################
77#
78# Public rules.
79#
80################################################################################
81
82# Returns the property set with the free features from the currently processed
83# build request.
84#
85def command_line_free_features():
86    return command_line_free_features
87
88# Sets the default toolset & version to be used in case no other toolset has
89# been used explicitly by either the loaded configuration files, the loaded
90# project build scripts or an explicit toolset request on the command line. For
91# more detailed information see the comment related to used global variables.
92#
93def set_default_toolset(toolset, version=None):
94    default_toolset = toolset
95    default_toolset_version = version
96
97
98pre_build_hook = []
99
100def add_pre_build_hook(callable):
101    pre_build_hook.append(callable)
102
103post_build_hook = None
104
105def set_post_build_hook(callable):
106    post_build_hook = callable
107
108################################################################################
109#
110# Local rules.
111#
112################################################################################
113
114# Returns actual Jam targets to be used for executing a clean request.
115#
116def actual_clean_targets(targets):
117
118    # Construct a list of projects explicitly detected as targets on this build
119    # system run. These are the projects under which cleaning is allowed.
120    for t in targets:
121        if isinstance(t, b2.build.targets.ProjectTarget):
122            project_targets.append(t.project_module())
123
124    # Construct a list of targets explicitly detected on this build system run
125    # as a result of building main targets.
126    targets_to_clean = set()
127    for t in results_of_main_targets:
128        # Do not include roots or sources.
129        targets_to_clean.update(virtual_target.traverse(t))
130
131    to_clean = []
132    for t in get_manager().virtual_targets().all_targets():
133
134        # Remove only derived targets.
135        if t.action():
136            p = t.project()
137            if t in targets_to_clean or should_clean_project(p.project_module()):
138                to_clean.append(t)
139
140    return [t.actualize() for t in to_clean]
141
142_target_id_split = re.compile("(.*)//(.*)")
143
144# Given a target id, try to find and return the corresponding target. This is
145# only invoked when there is no Jamfile in ".". This code somewhat duplicates
146# code in project-target.find but we can not reuse that code without a
147# project-targets instance.
148#
149def find_target(target_id):
150
151    projects = get_manager().projects()
152    m = _target_id_split.match(target_id)
153    if m:
154        pm = projects.find(m.group(1), ".")
155    else:
156        pm = projects.find(target_id, ".")
157
158    if pm:
159        result = projects.target(pm)
160
161    if m:
162        result = result.find(m.group(2))
163
164    return result
165
166def initialize_config_module(module_name, location=None):
167
168    get_manager().projects().initialize(module_name, location)
169
170# Helper rule used to load configuration files. Loads the first configuration
171# file with the given 'filename' at 'path' into module with name 'module-name'.
172# Not finding the requested file may or may not be treated as an error depending
173# on the must-find parameter. Returns a normalized path to the loaded
174# configuration file or nothing if no file was loaded.
175#
176def load_config(module_name, filename, paths, must_find=False):
177
178    if debug_config:
179        print "notice: Searching  '%s' for '%s' configuration file '%s." \
180              % (paths, module_name, filename)
181
182    where = None
183    for path in paths:
184        t = os.path.join(path, filename)
185        if os.path.exists(t):
186            where = t
187            break
188
189    if where:
190        where = os.path.realpath(where)
191
192        if debug_config:
193            print "notice: Loading '%s' configuration file '%s' from '%s'." \
194                  % (module_name, filename, where)
195
196        # Set source location so that path-constant in config files
197        # with relative paths work. This is of most importance
198        # for project-config.jam, but may be used in other
199        # config files as well.
200        attributes = get_manager().projects().attributes(module_name) ;
201        attributes.set('source-location', os.path.dirname(where), True)
202        get_manager().projects().load_standalone(module_name, where)
203
204    else:
205        msg = "Configuration file '%s' not found in '%s'." % (filename, path)
206        if must_find:
207            get_manager().errors()(msg)
208
209        elif debug_config:
210            print msg
211
212    return where
213
214# Loads all the configuration files used by Boost Build in the following order:
215#
216#   -- test-config --
217#   Loaded only if specified on the command-line using the --test-config
218# command-line parameter. It is ok for this file not to exist even if
219# specified. If this configuration file is loaded, regular site and user
220# configuration files will not be. If a relative path is specified, file is
221# searched for in the current folder.
222#
223#   -- site-config --
224#   Always named site-config.jam. Will only be found if located on the system
225# root path (Windows), /etc (non-Windows), user's home folder or the Boost
226# Build path, in that order. Not loaded in case the test-config configuration
227# file is loaded or the --ignore-site-config command-line option is specified.
228#
229#   -- user-config --
230#   Named user-config.jam by default or may be named explicitly using the
231# --user-config command-line option or the BOOST_BUILD_USER_CONFIG environment
232# variable. If named explicitly the file is looked for from the current working
233# directory and if the default one is used then it is searched for in the
234# user's home directory and the Boost Build path, in that order. Not loaded in
235# case either the test-config configuration file is loaded or an empty file
236# name is explicitly specified. If the file name has been given explicitly then
237# the file must exist.
238#
239# Test configurations have been added primarily for use by Boost Build's
240# internal unit testing system but may be used freely in other places as well.
241#
242def load_configuration_files():
243
244    # Flag indicating that site configuration should not be loaded.
245    ignore_site_config = "--ignore-site-config" in sys.argv
246
247    initialize_config_module("test-config")
248    test_config = None
249    for a in sys.argv:
250        m = re.match("--test-config=(.*)$", a)
251        if m:
252            test_config = b2.util.unquote(m.group(1))
253            break
254
255    if test_config:
256        where = load_config("test-config", os.path.basename(test_config), [os.path.dirname(test_config)])
257        if where:
258            if debug_config:
259                print "notice: Regular site and user configuration files will"
260                print "notice: be ignored due to the test configuration being loaded."
261
262    user_path = [os.path.expanduser("~")] + bjam.variable("BOOST_BUILD_PATH")
263    site_path = ["/etc"] + user_path
264    if os.name in ["nt"]:
265        site_path = [os.getenv("SystemRoot")] + user_path
266
267    if debug_config and not test_config and ignore_site_config:
268        print "notice: Site configuration files will be ignored due to the"
269        print "notice: --ignore-site-config command-line option."
270
271    initialize_config_module("site-config")
272    if not test_config and not ignore_site_config:
273        load_config('site-config', 'site-config.jam', site_path)
274
275    initialize_config_module('user-config')
276    if not test_config:
277
278        # Here, user_config has value of None if nothing is explicitly
279        # specified, and value of '' if user explicitly does not want
280        # to load any user config.
281        user_config = None
282        for a in sys.argv:
283            m = re.match("--user-config=(.*)$", a)
284            if m:
285                user_config = m.group(1)
286                break
287
288        if user_config is None:
289            user_config = os.getenv("BOOST_BUILD_USER_CONFIG")
290
291        # Special handling for the case when the OS does not strip the quotes
292        # around the file name, as is the case when using Cygwin bash.
293        user_config = b2.util.unquote(user_config)
294        explicitly_requested = user_config
295
296        if user_config is None:
297            user_config = "user-config.jam"
298
299        if user_config:
300            if explicitly_requested:
301
302                user_config = os.path.abspath(user_config)
303
304                if debug_config:
305                    print "notice: Loading explicitly specified user configuration file:"
306                    print "    " + user_config
307
308                    load_config('user-config', os.path.basename(user_config), [os.path.dirname(user_config)], True)
309            else:
310                load_config('user-config', os.path.basename(user_config), user_path)
311        else:
312            if debug_config:
313                print "notice: User configuration file loading explicitly disabled."
314
315    # We look for project-config.jam from "." upward. I am not sure this is
316    # 100% right decision, we might as well check for it only alongside the
317    # Jamroot file. However:
318    # - We need to load project-config.jam before Jamroot
319    # - We probably need to load project-config.jam even if there is no Jamroot
320    #   - e.g. to implement automake-style out-of-tree builds.
321    if os.path.exists("project-config.jam"):
322        file = ["project-config.jam"]
323    else:
324        file = b2.util.path.glob_in_parents(".", ["project-config.jam"])
325
326    if file:
327        initialize_config_module('project-config', os.path.dirname(file[0]))
328        load_config('project-config', "project-config.jam", [os.path.dirname(file[0])], True)
329
330
331# Autoconfigure toolsets based on any instances of --toolset=xx,yy,...zz or
332# toolset=xx,yy,...zz in the command line. May return additional properties to
333# be processed as if they had been specified by the user.
334#
335def process_explicit_toolset_requests():
336
337    extra_properties = []
338
339    option_toolsets = [e for option in b2.util.regex.transform(sys.argv, "^--toolset=(.*)$")
340                       for e in option.split(',')]
341    feature_toolsets = [e for option in b2.util.regex.transform(sys.argv, "^toolset=(.*)$")
342                       for e in option.split(',')]
343
344    for t in option_toolsets + feature_toolsets:
345
346        # Parse toolset-version/properties.
347        (toolset_version, toolset, version) = re.match("(([^-/]+)-?([^/]+)?)/?.*", t).groups()
348
349        if debug_config:
350            print "notice: [cmdline-cfg] Detected command-line request for '%s': toolset= %s version=%s" \
351            % (toolset_version, toolset, version)
352
353        # If the toolset is not known, configure it now.
354        known = False
355        if toolset in feature.values("toolset"):
356            known = True
357
358        if known and version and not feature.is_subvalue("toolset", toolset, "version", version):
359            known = False
360        # TODO: we should do 'using $(toolset)' in case no version has been
361        # specified and there are no versions defined for the given toolset to
362        # allow the toolset to configure its default version. For this we need
363        # to know how to detect whether a given toolset has any versions
364        # defined. An alternative would be to do this whenever version is not
365        # specified but that would require that toolsets correctly handle the
366        # case when their default version is configured multiple times which
367        # should be checked for all existing toolsets first.
368
369        if not known:
370
371            if debug_config:
372                print "notice: [cmdline-cfg] toolset '%s' not previously configured; attempting to auto-configure now" % toolset_version
373            if version is not None:
374               using(toolset, version)
375            else:
376               using(toolset)
377
378        else:
379
380            if debug_config:
381
382                print "notice: [cmdline-cfg] toolset '%s' already configured" % toolset_version
383
384        # Make sure we get an appropriate property into the build request in
385        # case toolset has been specified using the "--toolset=..." command-line
386        # option form.
387        if not t in sys.argv and not t in feature_toolsets:
388
389            if debug_config:
390                print "notice: [cmdline-cfg] adding toolset=%s) to the build request." % t ;
391            extra_properties += "toolset=%s" % t
392
393    return extra_properties
394
395
396
397# Returns 'true' if the given 'project' is equal to or is a (possibly indirect)
398# child to any of the projects requested to be cleaned in this build system run.
399# Returns 'false' otherwise. Expects the .project-targets list to have already
400# been constructed.
401#
402@cached
403def should_clean_project(project):
404
405    if project in project_targets:
406        return True
407    else:
408
409        parent = get_manager().projects().attribute(project, "parent-module")
410        if parent and parent != "user-config":
411            return should_clean_project(parent)
412        else:
413            return False
414
415################################################################################
416#
417# main()
418# ------
419#
420################################################################################
421
422def main():
423
424    sys.argv = bjam.variable("ARGV")
425
426    # FIXME: document this option.
427    if "--profiling" in sys.argv:
428        import cProfile
429        r = cProfile.runctx('main_real()', globals(), locals(), "stones.prof")
430
431        import pstats
432        stats = pstats.Stats("stones.prof")
433        stats.strip_dirs()
434        stats.sort_stats('time', 'calls')
435        stats.print_callers(20)
436        return r
437    else:
438        try:
439            return main_real()
440        except ExceptionWithUserContext, e:
441            e.report()
442
443def main_real():
444
445    global debug_config, out_xml
446
447    debug_config = "--debug-configuration" in sys.argv
448    out_xml = any(re.match("^--out-xml=(.*)$", a) for a in sys.argv)
449
450    engine = Engine()
451
452    global_build_dir = option.get("build-dir")
453    manager = Manager(engine, global_build_dir)
454
455    import b2.build.configure as configure
456
457    if "--version" in sys.argv:
458        from b2.build import version
459        version.report()
460        return
461
462    # This module defines types and generator and what not,
463    # and depends on manager's existence
464    import b2.tools.builtin
465
466    b2.tools.common.init(manager)
467
468    load_configuration_files()
469
470    # Load explicitly specified toolset modules.
471    extra_properties = process_explicit_toolset_requests()
472
473    # Load the actual project build script modules. We always load the project
474    # in the current folder so 'use-project' directives have any chance of
475    # being seen. Otherwise, we would not be able to refer to subprojects using
476    # target ids.
477    current_project = None
478    projects = get_manager().projects()
479    if projects.find(".", "."):
480        current_project = projects.target(projects.load("."))
481
482    # Load the default toolset module if no other has already been specified.
483    if not feature.values("toolset"):
484
485        dt = default_toolset
486        dtv = None
487        if default_toolset:
488            dtv = default_toolset_version
489        else:
490            dt = "gcc"
491            if os.name == 'nt':
492                dt = "msvc"
493            # FIXME:
494            #else if [ os.name ] = MACOSX
495            #{
496            #    default-toolset = darwin ;
497            #}
498
499        print "warning: No toolsets are configured."
500        print "warning: Configuring default toolset '%s'." % dt
501        print "warning: If the default is wrong, your build may not work correctly."
502        print "warning: Use the \"toolset=xxxxx\" option to override our guess."
503        print "warning: For more configuration options, please consult"
504        print "warning: http://boost.org/boost-build2/doc/html/bbv2/advanced/configuration.html"
505
506        using(dt, dtv)
507
508    # Parse command line for targets and properties. Note that this requires
509    # that all project files already be loaded.
510    (target_ids, properties) = build_request.from_command_line(sys.argv[1:] + extra_properties)
511
512    # Expand properties specified on the command line into multiple property
513    # sets consisting of all legal property combinations. Each expanded property
514    # set will be used for a single build run. E.g. if multiple toolsets are
515    # specified then requested targets will be built with each of them.
516    if properties:
517        expanded = build_request.expand_no_defaults(properties)
518    else:
519        expanded = [property_set.empty()]
520
521    # Check that we actually found something to build.
522    if not current_project and not target_ids:
523        get_manager().errors()("no Jamfile in current directory found, and no target references specified.")
524        # FIXME:
525        # EXIT
526
527    # Flags indicating that this build system run has been started in order to
528    # clean existing instead of create new targets. Note that these are not the
529    # final flag values as they may get changed later on due to some special
530    # targets being specified on the command line.
531    clean = "--clean" in sys.argv
532    cleanall = "--clean-all" in sys.argv
533
534    # List of explicitly requested files to build. Any target references read
535    # from the command line parameter not recognized as one of the targets
536    # defined in the loaded Jamfiles will be interpreted as an explicitly
537    # requested file to build. If any such files are explicitly requested then
538    # only those files and the targets they depend on will be built and they
539    # will be searched for among targets that would have been built had there
540    # been no explicitly requested files.
541    explicitly_requested_files = []
542
543    # List of Boost Build meta-targets, virtual-targets and actual Jam targets
544    # constructed in this build system run.
545    targets = []
546    virtual_targets = []
547    actual_targets = []
548
549    explicitly_requested_files = []
550
551    # Process each target specified on the command-line and convert it into
552    # internal Boost Build target objects. Detect special clean target. If no
553    # main Boost Build targets were explictly requested use the current project
554    # as the target.
555    for id in target_ids:
556        if id == "clean":
557            clean = 1
558        else:
559            t = None
560            if current_project:
561                t = current_project.find(id, no_error=1)
562            else:
563                t = find_target(id)
564
565            if not t:
566                print "notice: could not find main target '%s'" % id
567                print "notice: assuming it's a name of file to create " ;
568                explicitly_requested_files.append(id)
569            else:
570                targets.append(t)
571
572    if not targets:
573        targets = [projects.target(projects.module_name("."))]
574
575    # FIXME: put this BACK.
576
577    ## if [ option.get dump-generators : : true ]
578    ## {
579    ##     generators.dump ;
580    ## }
581
582
583    # We wish to put config.log in the build directory corresponding
584    # to Jamroot, so that the location does not differ depending on
585    # directory where we do build.  The amount of indirection necessary
586    # here is scary.
587    first_project = targets[0].project()
588    first_project_root_location = first_project.get('project-root')
589    first_project_root_module = manager.projects().load(first_project_root_location)
590    first_project_root = manager.projects().target(first_project_root_module)
591    first_build_build_dir = first_project_root.build_dir()
592    configure.set_log_file(os.path.join(first_build_build_dir, "config.log"))
593
594    virtual_targets = []
595
596    global results_of_main_targets
597
598    # Now that we have a set of targets to build and a set of property sets to
599    # build the targets with, we can start the main build process by using each
600    # property set to generate virtual targets from all of our listed targets
601    # and any of their dependants.
602    for p in expanded:
603        manager.set_command_line_free_features(property_set.create(p.free()))
604
605        for t in targets:
606            try:
607                g = t.generate(p)
608                if not isinstance(t, ProjectTarget):
609                    results_of_main_targets.extend(g.targets())
610                virtual_targets.extend(g.targets())
611            except ExceptionWithUserContext, e:
612                e.report()
613            except Exception:
614                raise
615
616    # Convert collected virtual targets into actual raw Jam targets.
617    for t in virtual_targets:
618        actual_targets.append(t.actualize())
619
620
621     # FIXME: restore
622##     # If XML data output has been requested prepare additional rules and targets
623##     # so we can hook into Jam to collect build data while its building and have
624##     # it trigger the final XML report generation after all the planned targets
625##     # have been built.
626##     if $(.out-xml)
627##     {
628##         # Get a qualified virtual target name.
629##         rule full-target-name ( target )
630##         {
631##             local name = [ $(target).name ] ;
632##             local project = [ $(target).project ] ;
633##             local project-path = [ $(project).get location ] ;
634##             return $(project-path)//$(name) ;
635##         }
636
637##         # Generate an XML file containing build statistics for each constituent.
638##         #
639##         rule out-xml ( xml-file : constituents * )
640##         {
641##             # Prepare valid XML header and footer with some basic info.
642##             local nl = "
643## " ;
644##             local jam       = [ version.jam ] ;
645##             local os        = [ modules.peek : OS OSPLAT JAMUNAME ] "" ;
646##             local timestamp = [ modules.peek : JAMDATE ] ;
647##             local cwd       = [ PWD ] ;
648##             local command   = $(.sys.argv) ;
649##             local bb-version = [ version.boost-build ] ;
650##             .header on $(xml-file) =
651##                 "<?xml version=\"1.0\" encoding=\"utf-8\"?>"
652##                 "$(nl)<build format=\"1.0\" version=\"$(bb-version)\">"
653##                 "$(nl)  <jam version=\"$(jam:J=.)\" />"
654##                 "$(nl)  <os name=\"$(os[1])\" platform=\"$(os[2])\"><![CDATA[$(os[3-]:J= )]]></os>"
655##                 "$(nl)  <timestamp><![CDATA[$(timestamp)]]></timestamp>"
656##                 "$(nl)  <directory><![CDATA[$(cwd)]]></directory>"
657##                 "$(nl)  <command><![CDATA[\"$(command:J=\" \")\"]]></command>"
658##                 ;
659##             .footer on $(xml-file) =
660##                 "$(nl)</build>" ;
661
662##             # Generate the target dependency graph.
663##             .contents on $(xml-file) +=
664##                 "$(nl)  <targets>" ;
665##             for local t in [ virtual-target.all-targets ]
666##             {
667##                 local action = [ $(t).action ] ;
668##                 if $(action)
669##                     # If a target has no action, it has no dependencies.
670##                 {
671##                     local name = [ full-target-name $(t) ] ;
672##                     local sources = [ $(action).sources ] ;
673##                     local dependencies ;
674##                     for local s in $(sources)
675##                     {
676##                         dependencies += [ full-target-name $(s) ] ;
677##                     }
678
679##                     local path = [ $(t).path ] ;
680##                     local jam-target = [ $(t).actual-name ] ;
681
682##                     .contents on $(xml-file) +=
683##                         "$(nl)    <target>"
684##                         "$(nl)      <name><![CDATA[$(name)]]></name>"
685##                         "$(nl)      <dependencies>"
686##                         "$(nl)        <dependency><![CDATA[$(dependencies)]]></dependency>"
687##                         "$(nl)      </dependencies>"
688##                         "$(nl)      <path><![CDATA[$(path)]]></path>"
689##                         "$(nl)      <jam-target><![CDATA[$(jam-target)]]></jam-target>"
690##                         "$(nl)    </target>"
691##                         ;
692##                 }
693##             }
694##             .contents on $(xml-file) +=
695##                 "$(nl)  </targets>" ;
696
697##             # Build $(xml-file) after $(constituents). Do so even if a
698##             # constituent action fails and regenerate the xml on every bjam run.
699##             INCLUDES $(xml-file) : $(constituents) ;
700##             ALWAYS $(xml-file) ;
701##             __ACTION_RULE__ on $(xml-file) = build-system.out-xml.generate-action ;
702##             out-xml.generate $(xml-file) ;
703##         }
704
705##         # The actual build actions are here; if we did this work in the actions
706##         # clause we would have to form a valid command line containing the
707##         # result of @(...) below (the name of the XML file).
708##         #
709##         rule out-xml.generate-action ( args * : xml-file
710##             : command status start end user system : output ? )
711##         {
712##             local contents =
713##                 [ on $(xml-file) return $(.header) $(.contents) $(.footer) ] ;
714##             local f = @($(xml-file):E=$(contents)) ;
715##         }
716
717##         # Nothing to do here; the *real* actions happen in
718##         # out-xml.generate-action.
719##         actions quietly out-xml.generate { }
720
721##         # Define the out-xml file target, which depends on all the targets so
722##         # that it runs the collection after the targets have run.
723##         out-xml $(.out-xml) : $(actual-targets) ;
724
725##         # Set up a global __ACTION_RULE__ that records all the available
726##         # statistics about each actual target in a variable "on" the --out-xml
727##         # target.
728##         #
729##         rule out-xml.collect ( xml-file : target : command status start end user
730##             system : output ? )
731##         {
732##             local nl = "
733## " ;
734##             # Open the action with some basic info.
735##             .contents on $(xml-file) +=
736##                 "$(nl)  <action status=\"$(status)\" start=\"$(start)\" end=\"$(end)\" user=\"$(user)\" system=\"$(system)\">" ;
737
738##             # If we have an action object we can print out more detailed info.
739##             local action = [ on $(target) return $(.action) ] ;
740##             if $(action)
741##             {
742##                 local action-name    = [ $(action).action-name ] ;
743##                 local action-sources = [ $(action).sources     ] ;
744##                 local action-props   = [ $(action).properties  ] ;
745
746##                 # The qualified name of the action which we created the target.
747##                 .contents on $(xml-file) +=
748##                     "$(nl)    <name><![CDATA[$(action-name)]]></name>" ;
749
750##                 # The sources that made up the target.
751##                 .contents on $(xml-file) +=
752##                     "$(nl)    <sources>" ;
753##                 for local source in $(action-sources)
754##                 {
755##                     local source-actual = [ $(source).actual-name ] ;
756##                     .contents on $(xml-file) +=
757##                         "$(nl)      <source><![CDATA[$(source-actual)]]></source>" ;
758##                 }
759##                 .contents on $(xml-file) +=
760##                     "$(nl)    </sources>" ;
761
762##                 # The properties that define the conditions under which the
763##                 # target was built.
764##                 .contents on $(xml-file) +=
765##                     "$(nl)    <properties>" ;
766##                 for local prop in [ $(action-props).raw ]
767##                 {
768##                     local prop-name = [ MATCH ^<(.*)>$ : $(prop:G) ] ;
769##                     .contents on $(xml-file) +=
770##                         "$(nl)      <property name=\"$(prop-name)\"><![CDATA[$(prop:G=)]]></property>" ;
771##                 }
772##                 .contents on $(xml-file) +=
773##                     "$(nl)    </properties>" ;
774##             }
775
776##             local locate = [ on $(target) return $(LOCATE) ] ;
777##             locate ?= "" ;
778##             .contents on $(xml-file) +=
779##                 "$(nl)    <jam-target><![CDATA[$(target)]]></jam-target>"
780##                 "$(nl)    <path><![CDATA[$(target:G=:R=$(locate))]]></path>"
781##                 "$(nl)    <command><![CDATA[$(command)]]></command>"
782##                 "$(nl)    <output><![CDATA[$(output)]]></output>" ;
783##             .contents on $(xml-file) +=
784##                 "$(nl)  </action>" ;
785##         }
786
787##         # When no __ACTION_RULE__ is set "on" a target, the search falls back to
788##         # the global module.
789##         module
790##         {
791##             __ACTION_RULE__ = build-system.out-xml.collect
792##                 [ modules.peek build-system : .out-xml ] ;
793##         }
794
795##         IMPORT
796##             build-system :
797##             out-xml.collect
798##             out-xml.generate-action
799##             : :
800##             build-system.out-xml.collect
801##             build-system.out-xml.generate-action
802##             ;
803##     }
804
805    j = option.get("jobs")
806    if j:
807        bjam.call("set-variable", 'PARALLELISM', j)
808
809    k = option.get("keep-going", "true", "true")
810    if k in ["on", "yes", "true"]:
811        bjam.call("set-variable", "KEEP_GOING", "1")
812    elif k in ["off", "no", "false"]:
813        bjam.call("set-variable", "KEEP_GOING", "0")
814    else:
815        print "error: Invalid value for the --keep-going option"
816        sys.exit()
817
818    # The 'all' pseudo target is not strictly needed expect in the case when we
819    # use it below but people often assume they always have this target
820    # available and do not declare it themselves before use which may cause
821    # build failures with an error message about not being able to build the
822    # 'all' target.
823    bjam.call("NOTFILE", "all")
824
825    # And now that all the actual raw Jam targets and all the dependencies
826    # between them have been prepared all that is left is to tell Jam to update
827    # those targets.
828    if explicitly_requested_files:
829        # Note that this case can not be joined with the regular one when only
830        # exact Boost Build targets are requested as here we do not build those
831        # requested targets but only use them to construct the dependency tree
832        # needed to build the explicitly requested files.
833        # FIXME: add $(.out-xml)
834        bjam.call("UPDATE", ["<e>%s" % x for x in explicitly_requested_files])
835    elif cleanall:
836        bjam.call("UPDATE", "clean-all")
837    elif clean:
838        manager.engine().set_update_action("common.Clean", "clean",
839                                           actual_clean_targets(targets))
840        bjam.call("UPDATE", "clean")
841    else:
842        # FIXME:
843        #configure.print-configure-checks-summary ;
844
845        if pre_build_hook:
846            for h in pre_build_hook:
847                h()
848
849        bjam.call("DEPENDS", "all", actual_targets)
850        ok = bjam.call("UPDATE_NOW", "all") # FIXME: add out-xml
851        if post_build_hook:
852            post_build_hook(ok)
853        # Prevent automatic update of the 'all' target, now that
854        # we have explicitly updated what we wanted.
855        bjam.call("UPDATE")
856
857    if manager.errors().count() == 0:
858        return ["ok"]
859    else:
860        return []
861