1. SCons
  2. Core
  3. SCons

Source

SCons / src / engine / SCons / Script / __init__.py

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
"""SCons.Script

This file implements the main() function used by the scons script.

Architecturally, this *is* the scons script, and will likely only be
called from the external "scons" wrapper.  Consequently, anything here
should not be, or be considered, part of the build engine.  If it's
something that we expect other software to want to use, it should go in
some other module.  If it's specific to the "scons" script invocation,
it goes here.

"""

#
# __COPYRIGHT__
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# 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 AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#

__revision__ = "__FILE__ __REVISION__ __DATE__ __DEVELOPER__"

import time
start_time = time.time()

import os
import os.path
import string
import sys
import traceback

# Strip the script directory from sys.path() so on case-insensitive
# (WIN32) systems Python doesn't think that the "scons" script is the
# "SCons" package.  Replace it with our own version directory so, if
# if they're there, we pick up the right version of the build engine
# modules.
#sys.path = [os.path.join(sys.prefix,
#                         'lib',
#                         'scons-%d' % SCons.__version__)] + sys.path[1:]

import SCons.Errors
import SCons.Job
import SCons.Node
import SCons.Node.FS
from SCons.Optik import OptionParser, SUPPRESS_HELP, OptionValueError
import SCons.Script.SConscript
import SCons.Sig
import SCons.Taskmaster
from SCons.Util import display
import SCons.Warnings


#
# Task control.
#
class BuildTask(SCons.Taskmaster.Task):
    """An SCons build task."""
    def execute(self):
        target = self.targets[0]
        if target.get_state() == SCons.Node.up_to_date:
            if self.top and target.has_builder():
                display('scons: "%s" is up to date.' % str(target))
        elif target.has_builder() and not hasattr(target.builder, 'status'):
            if print_time:
                start_time = time.time()
            SCons.Taskmaster.Task.execute(self)
            if print_time:
                finish_time = time.time()
                global command_time
                command_time = command_time+finish_time-start_time
                print "Command execution time: %f seconds"%(finish_time-start_time)

    def do_failed(self):
        global exit_status
        if ignore_errors:
            SCons.Taskmaster.Task.executed(self)
        elif keep_going_on_error:
            SCons.Taskmaster.Task.fail_continue(self)
            exit_status = 2
        else:
            SCons.Taskmaster.Task.fail_stop(self)
            exit_status = 2
            
    def executed(self):
        t = self.targets[0]
        if self.top and not t.has_builder() and not t.side_effect:
            if not t.exists():
                sys.stderr.write("scons: *** Do not know how to make target `%s'." % t)
                if not keep_going_on_error:
                    sys.stderr.write("  Stop.")
                sys.stderr.write("\n")
                self.do_failed()
            else:
                print "scons: Nothing to be done for `%s'." % t
                SCons.Taskmaster.Task.executed(self)
        else:
            SCons.Taskmaster.Task.executed(self)

        # print the tree here instead of in execute() because
        # this method is serialized, but execute isn't:
        if print_tree and self.top:
            print
            print SCons.Util.render_tree(self.targets[0], get_all_children)
        if print_dtree and self.top:
            print
            print SCons.Util.render_tree(self.targets[0], get_derived_children)
        if print_includes and self.top:
            t = self.targets[0]
            tree = t.render_include_tree()
            if tree:
                print
                print tree

    def failed(self):
        e = sys.exc_value
        if sys.exc_type == SCons.Errors.BuildError:
            sys.stderr.write("scons: *** [%s] %s\n" % (e.node, e.errstr))
            if e.errstr == 'Exception':
                traceback.print_exception(e.args[0], e.args[1], e.args[2])
        elif sys.exc_type == SCons.Errors.UserError:
            # We aren't being called out of a user frame, so
            # don't try to walk the stack, just print the error.
            sys.stderr.write("\nscons: *** %s\n" % e)
        elif sys.exc_type == SCons.Errors.StopError:
            s = str(e)
            if not keep_going_on_error:
                s = s + '  Stop.'
            sys.stderr.write("scons: *** %s\n" % s)
        else:
            sys.stderr.write("scons: *** %s\n" % e)

        self.do_failed()

class CleanTask(SCons.Taskmaster.Task):
    """An SCons clean task."""
    def show(self):
        if self.targets[0].has_builder() or self.targets[0].side_effect:
            display("Removed " + str(self.targets[0]))
        if SCons.Script.SConscript.clean_targets.has_key(str(self.targets[0])):
            files = SCons.Script.SConscript.clean_targets[str(self.targets[0])]
            for f in files:
                SCons.Utils.fs_delete(str(f), 0)

    def remove(self):
        if self.targets[0].has_builder() or self.targets[0].side_effect:
            for t in self.targets:
                try:
                    removed = t.remove()
                except OSError, e:
                    print "scons: Could not remove '%s':" % str(t), e.strerror
                else:
                    if removed:
                        display("Removed " + str(t))
        if SCons.Script.SConscript.clean_targets.has_key(str(self.targets[0])):
            files = SCons.Script.SConscript.clean_targets[str(self.targets[0])]
            for f in files:
                SCons.Util.fs_delete(str(f))

    execute = remove

    def prepare(self):
        pass

class QuestionTask(SCons.Taskmaster.Task):
    """An SCons task for the -q (question) option."""
    def prepare(self):
        pass
    
    def execute(self):
        if self.targets[0].get_state() != SCons.Node.up_to_date:
            global exit_status
            exit_status = 1
            self.tm.stop()

    def executed(self):
        pass

# Global variables

keep_going_on_error = 0
print_tree = 0
print_dtree = 0
print_time = 0
print_includes = 0
ignore_errors = 0
sconscript_time = 0
command_time = 0
exit_status = 0 # exit status, assume success by default
profiling = 0
repositories = []
sig_module = None
num_jobs = 1 # this is modifed by SConscript.SetJobs()

# Exceptions for this module
class PrintHelp(Exception):
    pass

# utility functions

def get_num_jobs(options):
    if hasattr(options, 'num_jobs'):
        return options.num_jobs
    else:
        return num_jobs

def get_all_children(node): return node.all_children(None)

def get_derived_children(node):
    children = node.all_children(None)
    return filter(lambda x: x.has_builder(), children)

def _scons_syntax_error(e):
    """Handle syntax errors. Print out a message and show where the error
    occurred.
    """
    etype, value, tb = sys.exc_info()
    lines = traceback.format_exception_only(etype, value)
    for line in lines:
        sys.stderr.write(line+'\n')
    sys.exit(2)

def find_deepest_user_frame(tb):
    """
    Find the deepest stack frame that is not part of SCons.

    Input is a "pre-processed" stack trace in the form
    returned by traceback.extract_tb() or traceback.extract_stack()
    """
    
    tb.reverse()

    # find the deepest traceback frame that is not part
    # of SCons:
    for frame in tb:
        filename = frame[0]
        if string.find(filename, os.sep+'SCons'+os.sep) == -1:
            return frame
    return tb[0]

def _scons_user_error(e):
    """Handle user errors. Print out a message and a description of the
    error, along with the line number and routine where it occured. 
    The file and line number will be the deepest stack frame that is
    not part of SCons itself.
    """
    etype, value, tb = sys.exc_info()
    filename, lineno, routine, dummy = find_deepest_user_frame(traceback.extract_tb(tb))
    sys.stderr.write("\nscons: *** %s\n" % value)
    sys.stderr.write('File "%s", line %d, in %s\n' % (filename, lineno, routine))
    sys.exit(2)

def _scons_user_warning(e):
    """Handle user warnings. Print out a message and a description of
    the warning, along with the line number and routine where it occured.
    The file and line number will be the deepest stack frame that is
    not part of SCons itself.
    """
    etype, value, tb = sys.exc_info()
    filename, lineno, routine, dummy = find_deepest_user_frame(traceback.extract_tb(tb))
    sys.stderr.write("\nscons: warning: %s\n" % e)
    sys.stderr.write('File "%s", line %d, in %s\n' % (filename, lineno, routine))

def _scons_internal_warning(e):
    """Slightly different from _scons_user_warning in that we use the
    *current call stack* rather than sys.exc_info() to get our stack trace.
    This is used by the warnings framework to print warnings."""
    filename, lineno, routine, dummy = find_deepest_user_frame(traceback.extract_stack())
    sys.stderr.write("\nscons: warning: %s\n" % e)
    sys.stderr.write('File "%s", line %d, in %s\n' % (filename, lineno, routine))

def _scons_other_errors():
    """Handle all errors but user errors. Print out a message telling
    the user what to do in this case and print a normal trace.
    """
    print 'other errors'
    traceback.print_exc()
    sys.exit(2)

def _varargs(option, parser):
    value = None
    if parser.rargs:
        arg = parser.rargs[0]
        if arg[0] != "-":
            value = arg
            del parser.rargs[0]
    return value

def _setup_warn(arg):
    """The --warn option.  An argument to this option
    should be of the form <warning-class> or no-<warning-class>.
    The warning class is munged in order to get an actual class
    name from the SCons.Warnings module to enable or disable.
    The supplied <warning-class> is split on hyphens, each element
    is captialized, then smushed back together.  Then the string
    "SCons.Warnings." is added to the front and "Warning" is added
    to the back to get the fully qualified class name.

    For example, --warn=deprecated will enable the
    SCons.Warnings.DeprecatedWarning class.

    --warn=no-dependency will disable the
    SCons.Warnings.DependencyWarning class.

    As a special case, --warn=all and --warn=no-all
    will enable or disable (respectively) the base
    class of all warnings, which is SCons.Warning.Warning."""

    elems = string.split(string.lower(arg), '-')
    enable = 1
    if elems[0] == 'no':
        enable = 0
        del elems[0]

    if len(elems) == 1 and elems[0] == 'all':
        class_name = "Warning"
    else:
        class_name = string.join(map(string.capitalize, elems), '') + \
                     "Warning"
    try:
        clazz = getattr(SCons.Warnings, class_name)
    except AttributeError:
        sys.stderr.write("No warning type: '%s'\n" % arg)
    else:
        if enable:
            SCons.Warnings.enableWarningClass(clazz)
        else:
            SCons.Warnings.suppressWarningClass(clazz)

def _SConstruct_exists(dirname=''):
    """This function checks that an SConstruct file exists in a directory.
    If so, it returns the path of the file. By default, it checks the
    current directory.
    """
    global repositories
    for file in ['SConstruct', 'Sconstruct', 'sconstruct']:
        sfile = os.path.join(dirname, file)
        if os.path.isfile(sfile):
            return sfile
        if not os.path.isabs(sfile):
            for rep in repositories:
                if os.path.isfile(os.path.join(rep, sfile)):
                    return sfile
    return None

def _set_globals(options):
    global repositories, keep_going_on_error, print_tree, print_dtree
    global print_time, ignore_errors, print_includes

    if options.repository:
        repositories.extend(options.repository)
    keep_going_on_error = options.keep_going
    try:
        if options.debug:
            if options.debug == "tree":
                print_tree = 1
            elif options.debug == "dtree":
                print_dtree = 1
            elif options.debug == "time":
                print_time = 1
            elif options.debug == "includes":
                print_includes = 1
    except AttributeError:
        pass
    ignore_errors = options.ignore_errors

def _create_path(plist):
    path = '.'
    for d in plist:
        if os.path.isabs(d):
            path = d
        else:
            path = path + '/' + d
    return path


class OptParser(OptionParser):
    def __init__(self):
        import __main__
        import SCons
        parts = ["SCons by Steven Knight et al.:\n"]
        try:
            parts.append("\tscript: v%s.%s, %s, by %s on %s\n" % (__main__.__version__,
                                                                  __main__.__build__,
                                                                  __main__.__date__,
                                                                  __main__.__developer__,
                                                                  __main__.__buildsys__))
        except:
            # On win32 there is no scons.py, so there is no __main__.__version__,
            # hence there is no script version.
            pass 
        parts.append("\tengine: v%s.%s, %s, by %s on %s\n" % (SCons.__version__,
                                                              SCons.__build__,
                                                              SCons.__date__,
                                                              SCons.__developer__,
                                                              SCons.__buildsys__))
        parts.append("__COPYRIGHT__")
        OptionParser.__init__(self, version=string.join(parts, ''),
                              usage="usage: scons [OPTION] [TARGET] ...")

        # options ignored for compatibility
        def opt_ignore(option, opt, value, parser):
            sys.stderr.write("Warning:  ignoring %s option\n" % opt)
        self.add_option("-b", "-m", "-S", "-t", "--no-keep-going", "--stop",
                        "--touch", action="callback", callback=opt_ignore,
                        help="Ignored for compatibility.")

        self.add_option('-c', '--clean', '--remove', action="store_true",
                        default=0, dest="clean",
                        help="Remove specified targets and dependencies.")

        self.add_option('-C', '--directory', type="string", action = "append",
                        help="Change to DIRECTORY before doing anything.")

        def opt_not_yet(option, opt, value, parser):
            sys.stderr.write("Warning:  the %s option is not yet implemented\n" % opt)
            sys.exit(0)
        self.add_option('-d', action="callback",
                        callback=opt_not_yet,
                        help = "Print file dependency information.")
        
        self.add_option('-D', action="store_const", const=2, dest="climb_up",
                        help="Search up directory tree for SConstruct, "
                             "build all Default() targets.")

        def opt_debug(option, opt, value, parser):
            if value == "pdb":
                if os.name == 'java':
                    python = os.path.join(sys.prefix, 'jython')
                else:
                    python = sys.executable
                args = [ python, "pdb.py" ] + \
                       filter(lambda x: x != "--debug=pdb", sys.argv)
                if sys.platform == 'win32':
                    args[1] = os.path.join(sys.prefix, "lib", "pdb.py")
                    sys.exit(os.spawnve(os.P_WAIT, args[0], args, os.environ))
                else:
                    args[1] = os.path.join(sys.prefix,
                                           "lib",
                                           "python" + sys.version[0:3],
                                           "pdb.py")
                os.execvpe(args[0], args, os.environ)
            elif value in ["tree", "dtree", "time", "includes"]:
                setattr(parser.values, 'debug', value)
            else:
                raise OptionValueError("Warning:  %s is not a valid debug type" % value)
        self.add_option('--debug', action="callback", type="string",
                        callback=opt_debug, nargs=1, dest="debug",
                        help="Print various types of debugging information.")

        self.add_option('-f', '--file', '--makefile', '--sconstruct',
                        action="append", nargs=1,
                        help="Read FILE as the top-level SConstruct file.")

        self.add_option('-h', '--help', action="store_true", default=0,
                        dest="help_msg",
                        help="Print defined help message, or this one.")

        self.add_option("-H", "--help-options",
                        action="help",
                        help="Print this message and exit.")

        self.add_option('-i', '--ignore-errors', action="store_true",
                        default=0, dest='ignore_errors',
                        help="Ignore errors from build actions.")

        self.add_option('-I', '--include-dir', action="append",
                        dest='include_dir', metavar="DIRECTORY",
                        help="Search DIRECTORY for imported Python modules.")

        self.add_option('--implicit-cache', action="store_true", default=0,
                        dest='implicit_cache',
                        help="Cache implicit dependencies")

        self.add_option('--implicit-deps-changed', action="store_true",
                        default=0, dest='implicit_deps_changed',
                        help="Ignore the cached implicit deps.")
        self.add_option('--implicit-deps-unchanged', action="store_true",
                        default=0, dest='implicit_deps_unchanged',
                        help="Ignore changes in implicit deps.")

        def opt_j(option, opt, value, parser):
            value = int(value)
            setattr(parser.values, 'num_jobs', value)
        self.add_option('-j', '--jobs', action="callback", type="int",
                        callback=opt_j, metavar="N",
                        help="Allow N jobs at once.")

        self.add_option('-k', '--keep-going', action="store_true", default=0,
                        dest='keep_going',
                        help="Keep going when a target can't be made.")

        self.add_option('--max-drift', type="int", action="store",
                        dest='max_drift',
                        help="Set the maximum system clock drift to be"
                             " MAX_DRIFT seconds.")

        self.add_option('-n', '--no-exec', '--just-print', '--dry-run',
                        '--recon', action="store_true", dest='noexec',
                        default=0, help="Don't build; just print commands.")

        def opt_profile(option, opt, value, parser):
            global profiling
            if not profiling:
                profiling = 1
                import profile
                profile.run('SCons.Script.main()', value)
                sys.exit(exit_status)
        self.add_option('--profile', nargs=1, action="callback",
                        callback=opt_profile, type="string", dest="profile",
                        help="Profile SCons and put results in PROFILE.")

        self.add_option('-q', '--question', action="store_true", default=0,
                        help="Don't build; exit status says if up to date.")

        self.add_option('-Q', dest='no_progress', action="store_true",
                        default=0,
                        help="Don't print SCons progress messages.")

        self.add_option('-s', '--silent', '--quiet', action="store_true",
                        default=0, help="Don't print commands.")

        self.add_option('-u', '--up', '--search-up', action="store_const",
                        dest="climb_up", default=0, const=1,
                        help="Search up directory tree for SConstruct, "
                             "build targets at or below current directory.")
        self.add_option('-U', action="store_const", dest="climb_up",
                        default=0, const=3,
                        help="Search up directory tree for SConstruct, "
                             "build Default() targets from local SConscript.")

        self.add_option("-v", "--version",
                        action="version",
                        help="Print the SCons version number and exit.")

        self.add_option('--warn', '--warning', nargs=1, action="store",
                        metavar="WARNING-SPEC",
                        help="Enable or disable warnings.")

        self.add_option('-Y', '--repository', nargs=1, action="append",
                        help="Search REPOSITORY for source and target files.")

        self.add_option('--cache-disable', '--no-cache', action="callback",
                        callback=opt_not_yet,
                        # help = "Do not retrieve built targets from Cache."
                        help=SUPPRESS_HELP)
        self.add_option('--cache-force', '--cache-populate', action="callback",
                        callback=opt_not_yet,
                        # help = "Copy already-built targets into the Cache."
                        help=SUPPRESS_HELP)
        self.add_option('--cache-show', action="callback",
                        callback=opt_not_yet,
                        # help = "Print what would have built Cached targets.",
                        help=SUPPRESS_HELP)
        self.add_option('-e', '--environment-overrides', action="callback",
                        callback=opt_not_yet,
                        # help="Environment variables override makefiles."
                        help=SUPPRESS_HELP)
        self.add_option('-l', '--load-average', '--max-load', action="callback",
                        callback=opt_not_yet, type="int", dest="load_average",
                        # action="store",
                        # help="Don't start multiple jobs unless load is below "
                        #      "LOAD-AVERAGE."
                        # type="int",
                        help=SUPPRESS_HELP)
        self.add_option('--list-derived', action="callback",
                        callback=opt_not_yet,
                        # help="Don't build; list files that would be built."
                        help=SUPPRESS_HELP)
        self.add_option('--list-actions', action="callback",
                        callback=opt_not_yet,
                        # help="Don't build; list files and build actions."
                        help=SUPPRESS_HELP)
        self.add_option('--list-where', action="callback",
                        callback=opt_not_yet,
                        # help="Don't build; list files and where defined."
                        help=SUPPRESS_HELP)
        self.add_option('-o', '--old-file', '--assume-old', action="callback",
                        callback=opt_not_yet, type="string", dest="old_file",
                        # help = "Consider FILE to be old; don't rebuild it."
                        help=SUPPRESS_HELP)
        self.add_option('--override', action="callback", dest="override",
                        callback=opt_not_yet, type="string",
                        # help="Override variables as specified in FILE."
                        help=SUPPRESS_HELP)
        self.add_option('-p', action="callback",
                        callback=opt_not_yet,
                        # help="Print internal environments/objects."
                        help=SUPPRESS_HELP)
        self.add_option('-r', '-R', '--no-builtin-rules',
                        '--no-builtin-variables', action="callback",
                        callback=opt_not_yet,
                        # help="Clear default environments and variables."
                        help=SUPPRESS_HELP)
        self.add_option('--random', action="callback",
                        callback=opt_not_yet,
                        # help="Build dependencies in random order."
                        help=SUPPRESS_HELP)
        self.add_option('-w', '--print-directory', action="callback",
                        callback=opt_not_yet,
                        # help="Print the current directory."
                        help=SUPPRESS_HELP)
        self.add_option('--no-print-directory', action="callback",
                        callback=opt_not_yet,
                        # help="Turn off -w, even if it was turned on implicitly."
                        help=SUPPRESS_HELP)
        self.add_option('--write-filenames', action="callback",
                        callback=opt_not_yet, type="string", dest="write_filenames",
                        # help="Write all filenames examined into FILE."
                        help=SUPPRESS_HELP)
        self.add_option('-W', '--what-if', '--new-file', '--assume-new',
                        dest="new_file",
                        action="callback", callback=opt_not_yet, type="string",
                        # help="Consider FILE to be changed."
                        help=SUPPRESS_HELP)
        self.add_option('--warn-undefined-variables', action="callback",
                        callback=opt_not_yet,
                        # help="Warn when an undefined variable is referenced."
                        help=SUPPRESS_HELP)

    def parse_args(self, args=None, values=None):
        opt, arglist = OptionParser.parse_args(self, args, values)
        if opt.implicit_deps_changed or opt.implicit_deps_unchanged:
            opt.implicit_cache = 1
        return opt, arglist


def _main():
    import SCons.Node

    targets = []

    # Enable deprecated warnings by default.
    SCons.Warnings._warningOut = _scons_internal_warning
    SCons.Warnings.enableWarningClass(SCons.Warnings.DeprecatedWarning)
    SCons.Warnings.enableWarningClass(SCons.Warnings.CorruptSConsignWarning)

    all_args = sys.argv[1:]
    try:
        all_args = string.split(os.environ['SCONSFLAGS']) + all_args
    except KeyError:
            # it's OK if there's no SCONSFLAGS
            pass
    parser = OptParser()
    global options
    options, args = parser.parse_args(all_args)

    if options.help_msg:
        def raisePrintHelp(text):
            raise PrintHelp, text
        SCons.Script.SConscript.HelpFunction = raisePrintHelp

    _set_globals(options)
    SCons.Node.implicit_cache = options.implicit_cache
    SCons.Node.implicit_deps_changed = options.implicit_deps_changed
    SCons.Node.implicit_deps_unchanged = options.implicit_deps_unchanged
    if options.warn:
        _setup_warn(options.warn)
    if options.noexec:
        SCons.Action.execute_actions = None
        CleanTask.execute = CleanTask.show
    if options.no_progress or options.silent:
        display.set_mode(0)
    if options.silent:
        SCons.Action.print_actions = None
    if options.directory:
        cdir = _create_path(options.directory)
        try:
            os.chdir(cdir)
        except:
            sys.stderr.write("Could not change directory to %s\n" % cdir)

    xmit_args = []
    for a in args:
        if '=' in a:
            xmit_args.append(a)
        else:
            targets.append(a)
    SCons.Script.SConscript._scons_add_args(xmit_args)

    target_top = None
    if options.climb_up:
        target_top = '.'  # directory to prepend to targets
        script_dir = os.getcwd()  # location of script
        while script_dir and not _SConstruct_exists(script_dir):
            script_dir, last_part = os.path.split(script_dir)
            if last_part:
                target_top = os.path.join(last_part, target_top)
            else:
                script_dir = ''
        if script_dir:
            display("scons: Entering directory %s" % script_dir)
            os.chdir(script_dir)
        else:
            raise SCons.Errors.UserError, "No SConstruct file found."

    SCons.Node.FS.default_fs.set_toplevel_dir(os.getcwd())

    scripts = []
    if options.file:
        scripts.extend(options.file)
    if not scripts:
        sfile = _SConstruct_exists()
        if sfile:
            scripts.append(sfile)

    if options.help_msg:
        if not scripts:
            # There's no SConstruct, but they specified -h.
            # Give them the options usage now, before we fail
            # trying to read a non-existent SConstruct file.
            parser.print_help()
            sys.exit(0)
        SCons.Script.SConscript.print_help = 1

    if not scripts:
        raise SCons.Errors.UserError, "No SConstruct file found."

    class Unbuffered:
        def __init__(self, file):
            self.file = file
        def write(self, arg):
            self.file.write(arg)
            self.file.flush()
        def __getattr__(self, attr):
            return getattr(self.file, attr)

    sys.stdout = Unbuffered(sys.stdout)

    if options.include_dir:
        sys.path = options.include_dir + sys.path

    global repositories
    for rep in repositories:
        SCons.Node.FS.default_fs.Repository(rep)

    display("scons: Reading SConscript files ...")
    try:
        start_time = time.time()
        for script in scripts:
            SCons.Script.SConscript.SConscript(script)
        global sconscript_time
        sconscript_time = time.time() - start_time
    except PrintHelp, text:
        display("scons: done reading SConscript files.")
        print text
        print "Use scons -H for help about command-line options."
        sys.exit(0)
    display("scons: done reading SConscript files.")

    SCons.Node.FS.default_fs.chdir(SCons.Node.FS.default_fs.Top)

    if options.help_msg:
        # They specified -h, but there was no Help() inside the
        # SConscript files.  Give them the options usage.
        parser.print_help(sys.stdout)
        sys.exit(0)

    if target_top:
        target_top = SCons.Node.FS.default_fs.Dir(target_top)
        
        if options.climb_up == 2 and not targets:
            # -D with default targets
            target_top = None
        elif options.climb_up == 3 and not targets:
            # -U with default targets
            default_targets = SCons.Script.SConscript.default_targets
            def check_dir(x, target_top=target_top):
                if hasattr(x, 'cwd') and not x.cwd is None:
                    cwd = x.cwd.srcnode()
                    return cwd == target_top
                else:
                    # x doesn't have a cwd, so it's either not a target,
                    # or not a file, so go ahead and keep it as a default
                    # target and let the engine sort it out:
                    return 1                
            default_targets = filter(check_dir, default_targets)
            SCons.Script.SConscript.default_targets = default_targets
            target_top = None

    if not targets:
        targets = SCons.Script.SConscript.default_targets

    if not targets:
        sys.stderr.write("scons: *** No targets specified and no Default() targets found.  Stop.\n")
        sys.exit(2)

    def Entry(x, top = target_top):
        if isinstance(x, SCons.Node.Node):
            node = x
        else:
            node = SCons.Node.Alias.default_ans.lookup(x)
            if node is None:
                node = SCons.Node.FS.default_fs.Entry(x,
                                                      directory = top,
                                                      create = 1)
        if top and not node.is_under(top):
            if isinstance(node, SCons.Node.FS.Dir) and top.is_under(node):
                node = top
            else:
                node = None
        return node

    nodes = filter(lambda x: x is not None, map(Entry, targets))

    calc = None
    task_class = BuildTask	# default action is to build targets
    if options.question:
        task_class = QuestionTask
    try:
        if options.clean:
            task_class = CleanTask
            class CleanCalculator:
                def bsig(self, node):
                    return None
                def csig(self, node):
                    return None
                def current(self, node, sig):
                    return 0
                def write(self):
                    pass
            calc = CleanCalculator()
    except AttributeError:
        pass

    if not calc:
        if options.max_drift is not None:
	    if sig_module is not None:
                SCons.Sig.default_calc = SCons.Sig.Calculator(module=sig_module,
                                                              max_drift=options.max_drift)
	    else:
                SCons.Sig.default_calc = SCons.Sig.Calculator(max_drift=options.max_drift)
        elif sig_module is not None:
            SCons.Sig.default_calc = SCons.Sig.Calculator(module=sig_module)

        calc = SCons.Sig.default_calc

    display("scons: Building targets ...")
    taskmaster = SCons.Taskmaster.Taskmaster(nodes, task_class, calc)

    jobs = SCons.Job.Jobs(get_num_jobs(options), taskmaster)

    try:
        jobs.run()
    finally:
        display("scons: done building targets.")
        SCons.Sig.write()

def main():
    global exit_status
    
    try:
	_main()
    except SystemExit, s:
        if s:
            exit_status = s
    except KeyboardInterrupt:
        print "Build interrupted."
        sys.exit(2)
    except SyntaxError, e:
        _scons_syntax_error(e)
    except SCons.Errors.UserError, e:
        _scons_user_error(e)
    except:
        _scons_other_errors()

    if print_time:
        total_time = time.time()-start_time
        scons_time = total_time-sconscript_time-command_time
        print "Total build time: %f seconds"%total_time
        print "Total SConscript file execution time: %f seconds"%sconscript_time
        print "Total SCons execution time: %f seconds"%scons_time
        print "Total command execution time: %f seconds"%command_time

    sys.exit(exit_status)