summaryrefslogtreecommitdiff
path: root/jam-files/engine/make.c
blob: c871f0be2d8ff4c86542f94b86a57e5a43c81096 (plain)
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
/*
 * Copyright 1993, 1995 Christopher Seiwald.
 *
 * This file is part of Jam - see jam.c for Copyright information.
 */

/*  This file is ALSO:
 *  Copyright 2001-2004 David Abrahams.
 *  Distributed under the Boost Software License, Version 1.0.
 *  (See accompanying file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
 */

/*
 * make.c - bring a target up to date, once rules are in place.
 *
 * This modules controls the execution of rules to bring a target and its
 * dependencies up to date. It is invoked after the targets, rules, et. al.
 * described in rules.h are created by the interpreting jam files.
 *
 * This file contains the main make() entry point and the first pass make0().
 * The second pass, make1(), which actually does the command execution, is in
 * make1.c.
 *
 * External routines:
 *  make() - make a target, given its name
 *
 * Internal routines:
 *  make0() - bind and scan everything to make a TARGET
 *  make0sort() - reorder TARGETS chain by their time (newest to oldest)
 *
 * 12/26/93 (seiwald) - allow NOTIME targets to be expanded via $(<), $(>).
 * 01/04/94 (seiwald) - print all targets, bounded, when tracing commands.
 * 04/08/94 (seiwald) - progress report now reflects only targets with actions.
 * 04/11/94 (seiwald) - Combined deps & headers into deps[2] in TARGET.
 * 12/20/94 (seiwald) - NOTIME renamed NOTFILE.
 * 12/20/94 (seiwald) - make0() headers after determining fate of target, so
 *                      that headers are not seen as being dependent on
 *                      themselves.
 * 01/19/95 (seiwald) - distinguish between CANTFIND/CANTMAKE targets.
 * 02/02/95 (seiwald) - propagate leaf source time for new LEAVES rule.
 * 02/14/95 (seiwald) - NOUPDATE rule means don't update existing target.
 * 08/22/95 (seiwald) - NOUPDATE targets immune to anyhow (-a) flag.
 * 09/06/00 (seiwald) - NOCARE affects targets with sources/actions.
 * 03/02/01 (seiwald) - reverse NOCARE change.
 * 03/14/02 (seiwald) - TEMPORARY targets no longer take on parents age.
 * 03/16/02 (seiwald) - support for -g (reorder builds by source time).
 */

#include "jam.h"

#include "lists.h"
#include "parse.h"
#include "variable.h"
#include "rules.h"

#ifdef OPT_HEADER_CACHE_EXT
    #include "hcache.h"
#endif

#include "search.h"
#include "newstr.h"
#include "make.h"
#include "headers.h"
#include "command.h"
#include <assert.h>

#ifndef max
    #define max( a,b ) ((a)>(b)?(a):(b))
#endif

static TARGETS * make0sort( TARGETS * c );

#ifdef OPT_GRAPH_DEBUG_EXT
    static void dependGraphOutput( TARGET * t, int depth );
#endif

static const char * target_fate[] =
{
    "init",     /* T_FATE_INIT     */
    "making",   /* T_FATE_MAKING   */
    "stable",   /* T_FATE_STABLE   */
    "newer",    /* T_FATE_NEWER    */
    "temp",     /* T_FATE_ISTMP    */
    "touched",  /* T_FATE_TOUCHED  */
    "rebuild",  /* T_FATE_REBUILD  */
    "missing",  /* T_FATE_MISSING  */
    "needtmp",  /* T_FATE_NEEDTMP  */
    "old",      /* T_FATE_OUTDATED */
    "update",   /* T_FATE_UPDATE   */
    "nofind",   /* T_FATE_CANTFIND */
    "nomake"    /* T_FATE_CANTMAKE */
};

static const char * target_bind[] =
{
    "unbound",
    "missing",
    "parents",
    "exists",
};

# define spaces(x) ( "                    " + ( x > 20 ? 0 : 20-x ) )


/*
 * make() - make a target, given its name.
 */

int make( int n_targets, char const * * targets, int anyhow )
{
    int    i;
    COUNTS counts[ 1 ];
    int    status = 0;     /* 1 if anything fails */

#ifdef OPT_HEADER_CACHE_EXT
    hcache_init();
#endif

    memset( (char *)counts, 0, sizeof( *counts ) );

    /* First bind all targets with LOCATE_TARGET setting. This is needed to
     * correctly handle dependencies to generated headers.
     */
    bind_explicitly_located_targets();

    {
        PROFILE_ENTER( MAKE_MAKE0 );
        for ( i = 0; i < n_targets; ++i )
            make0( bindtarget( targets[ i ] ), 0, 0, counts, anyhow );
        PROFILE_EXIT( MAKE_MAKE0 );
    }

#ifdef OPT_GRAPH_DEBUG_EXT
    if ( DEBUG_GRAPH )
        for ( i = 0; i < n_targets; ++i )
            dependGraphOutput( bindtarget( targets[ i ] ), 0 );
#endif

    if ( DEBUG_MAKE )
    {
        if ( counts->targets )
            printf( "...found %d target%s...\n", counts->targets,
                counts->targets > 1 ? "s" : "" );
        if ( counts->temp )
            printf( "...using %d temp target%s...\n", counts->temp,
                counts->temp > 1 ? "s" : "" );
        if ( counts->updating )
            printf( "...updating %d target%s...\n", counts->updating,
                counts->updating > 1 ? "s" : "" );
        if ( counts->cantfind )
            printf( "...can't find %d target%s...\n", counts->cantfind,
                counts->cantfind > 1 ? "s" : "" );
        if ( counts->cantmake )
            printf( "...can't make %d target%s...\n", counts->cantmake,
                counts->cantmake > 1 ? "s" : "" );
    }

#ifdef OPT_HEADER_CACHE_EXT
    hcache_done();
#endif

    status = counts->cantfind || counts->cantmake;

    {
        PROFILE_ENTER( MAKE_MAKE1 );
        for ( i = 0; i < n_targets; ++i )
            status |= make1( bindtarget( targets[ i ] ) );
        PROFILE_EXIT( MAKE_MAKE1 );
    }

    return status;
}


/* Force any dependants of t that have already at least begun being visited by
 * make0() to be updated.
 */

static void update_dependants( TARGET * t )
{
    TARGETS * q;

    for ( q = t->dependants; q; q = q->next )
    {
        TARGET * p = q->target;
        char fate0 = p->fate;

        /* If we have already at least begun visiting it and we are not already
         * rebuilding it for other reasons.
         */
        if ( ( fate0 != T_FATE_INIT ) && ( fate0 < T_FATE_BUILD ) )
        {
            p->fate = T_FATE_UPDATE;

            if ( DEBUG_FATE )
            {
                printf( "fate change  %s from %s to %s (as dependant of %s)\n",
                        p->name, target_fate[ (int) fate0 ], target_fate[ (int) p->fate ], t->name );
            }

            /* If we are done visiting it, go back and make sure its dependants
             * get rebuilt.
             */
            if ( fate0 > T_FATE_MAKING )
                update_dependants( p );
        }
    }
}


/*
 * Make sure that all of t's rebuilds get rebuilt.
 */

static void force_rebuilds( TARGET * t )
{
    TARGETS * d;
    for ( d = t->rebuilds; d; d = d->next )
    {
        TARGET * r = d->target;

        /* If it is not already being rebuilt for other reasons. */
        if ( r->fate < T_FATE_BUILD )
        {
            if ( DEBUG_FATE )
                printf( "fate change  %s from %s to %s (by rebuild)\n",
                        r->name, target_fate[ (int) r->fate ], target_fate[ T_FATE_REBUILD ] );

            /* Force rebuild it. */
            r->fate = T_FATE_REBUILD;

            /* And make sure its dependants are updated too. */
            update_dependants( r );
        }
    }
}


/*
 * make0() - bind and scan everything to make a TARGET.
 *
 * Recursively binds a target, searches for #included headers, calls itself on
 * those headers and any dependencies.
 */

void make0
(
    TARGET * t,
    TARGET * p,       /* parent */
    int      depth,   /* for display purposes */
    COUNTS * counts,  /* for reporting */
    int      anyhow
)  /* forcibly touch all (real) targets */
{
    TARGETS    * c;
    TARGET     * ptime = t;
    time_t       last;
    time_t       leaf;
    time_t       hlast;
    int          fate;
    char const * flag = "";
    SETTINGS   * s;

#ifdef OPT_GRAPH_DEBUG_EXT
    int savedFate, oldTimeStamp;
#endif

    if ( DEBUG_MAKEPROG )
        printf( "make\t--\t%s%s\n", spaces( depth ), t->name );

    /*
     * Step 1: initialize
     */

    if ( DEBUG_MAKEPROG )
        printf( "make\t--\t%s%s\n", spaces( depth ), t->name );

    t->fate = T_FATE_MAKING;

    /*
     * Step 2: under the influence of "on target" variables,
     * bind the target and search for headers.
     */

    /* Step 2a: set "on target" variables. */
    s = copysettings( t->settings );
    pushsettings( s );

    /* Step 2b: find and timestamp the target file (if it is a file). */
    if ( ( t->binding == T_BIND_UNBOUND ) && !( t->flags & T_FLAG_NOTFILE ) )
    {
        char * another_target;
        t->boundname = search( t->name, &t->time, &another_target,
                               t->flags & T_FLAG_ISFILE );
        /* If it was detected that this target refers to an already existing and
         * bound one, we add an include dependency, so that every target
         * depending on us will depend on that other target as well.
         */
        if ( another_target )
            target_include( t, bindtarget( another_target ) );

        t->binding = t->time ? T_BIND_EXISTS : T_BIND_MISSING;
    }

    /* INTERNAL, NOTFILE header nodes have the time of their parents. */
    if ( p && ( t->flags & T_FLAG_INTERNAL ) )
        ptime = p;

    /* If temp file does not exist but parent does, use parent. */
    if ( p && ( t->flags & T_FLAG_TEMP ) &&
        ( t->binding == T_BIND_MISSING ) &&
        ( p->binding != T_BIND_MISSING ) )
    {
        t->binding = T_BIND_PARENTS;
        ptime = p;
    }

#ifdef OPT_SEMAPHORE
    {
        LIST * var = var_get( "JAM_SEMAPHORE" );
        if ( var )
        {
            TARGET * semaphore = bindtarget( var->string );
            semaphore->progress = T_MAKE_SEMAPHORE;
            t->semaphore = semaphore;
        }
    }
#endif

    /* Step 2c: If its a file, search for headers. */
    if ( t->binding == T_BIND_EXISTS )
        headers( t );

    /* Step 2d: reset "on target" variables. */
    popsettings( s );
    freesettings( s );

    /*
     * Pause for a little progress reporting .
     */

    if ( DEBUG_BIND )
    {
        if ( strcmp( t->name, t->boundname ) )
            printf( "bind\t--\t%s%s: %s\n",
                spaces( depth ), t->name, t->boundname );

        switch ( t->binding )
        {
        case T_BIND_UNBOUND:
        case T_BIND_MISSING:
        case T_BIND_PARENTS:
            printf( "time\t--\t%s%s: %s\n",
                spaces( depth ), t->name, target_bind[ (int) t->binding ] );
            break;

        case T_BIND_EXISTS:
            printf( "time\t--\t%s%s: %s",
                spaces( depth ), t->name, ctime( &t->time ) );
            break;
        }
    }

    /*
     * Step 3: recursively make0() dependencies & headers.
     */

    /* Step 3a: recursively make0() dependencies. */
    for ( c = t->depends; c; c = c->next )
    {
        int internal = t->flags & T_FLAG_INTERNAL;

        /* Warn about circular deps, except for includes, which include each
         * other alot.
         */
        if ( c->target->fate == T_FATE_INIT )
            make0( c->target, ptime, depth + 1, counts, anyhow );
        else if ( c->target->fate == T_FATE_MAKING && !internal )
            printf( "warning: %s depends on itself\n", c->target->name );
    }

    /* Step 3b: recursively make0() internal includes node. */
    if ( t->includes )
        make0( t->includes, p, depth + 1, counts, anyhow );

    /* Step 3c: add dependencies' includes to our direct dependencies. */
    {
        TARGETS * incs = 0;
        for ( c = t->depends; c; c = c->next )
            if ( c->target->includes )
                incs = targetentry( incs, c->target->includes );
        t->depends = targetchain( t->depends, incs );
    }

    /*
     * Step 4: compute time & fate
     */

    /* Step 4a: pick up dependencies' time and fate */
    last = 0;
    leaf = 0;
    fate = T_FATE_STABLE;
    for ( c = t->depends; c; c = c->next )
    {
        /* If LEAVES has been applied, we only heed the timestamps of the leaf
         * source nodes.
         */
        leaf = max( leaf, c->target->leaf );

        if ( t->flags & T_FLAG_LEAVES )
        {
            last = leaf;
            continue;
        }

        last = max( last, c->target->time );
        fate = max( fate, c->target->fate );

#ifdef OPT_GRAPH_DEBUG_EXT
        if ( DEBUG_FATE )
            if ( fate < c->target->fate )
                printf( "fate change %s from %s to %s by dependency %s\n",
                    t->name, target_fate[(int) fate], target_fate[(int) c->target->fate],
                    c->target->name );
#endif
    }

    /* Step 4b: pick up included headers time */

    /*
     * If a header is newer than a temp source that includes it,
     * the temp source will need building.
     */

    hlast = t->includes ? t->includes->time : 0;

    /* Step 4c: handle NOUPDATE oddity.
     *
     * If a NOUPDATE file exists, mark it as having eternally old dependencies.
     * Do not inherit our fate from our dependencies. Decide fate based only on
     * other flags and our binding (done later).
     */
    if ( t->flags & T_FLAG_NOUPDATE )
    {
#ifdef OPT_GRAPH_DEBUG_EXT
        if ( DEBUG_FATE )
            if ( fate != T_FATE_STABLE )
                printf( "fate change  %s back to stable, NOUPDATE.\n", t->name
                    );
#endif

        last = 0;
        t->time = 0;

        /* Do not inherit our fate from our dependencies. Decide fate based only
         * upon other flags and our binding (done later).
         */
        fate = T_FATE_STABLE;
    }

    /* Step 4d: determine fate: rebuild target or what? */

    /*
        In English:
        If can not find or make child, can not make target.
        If children changed, make target.
        If target missing, make it.
        If children newer, make target.
        If temp's children newer than parent, make temp.
        If temp's headers newer than parent, make temp.
        If deliberately touched, make it.
        If up-to-date temp file present, use it.
        If target newer than non-notfile parent, mark target newer.
        Otherwise, stable!

        Note this block runs from least to most stable:
        as we make it further down the list, the target's
        fate is getting stabler.
    */

#ifdef OPT_GRAPH_DEBUG_EXT
    savedFate = fate;
    oldTimeStamp = 0;
#endif

    if ( fate >= T_FATE_BROKEN )
    {
        fate = T_FATE_CANTMAKE;
    }
    else if ( fate >= T_FATE_SPOIL )
    {
        fate = T_FATE_UPDATE;
    }
    else if ( t->binding == T_BIND_MISSING )
    {
        fate = T_FATE_MISSING;
    }
    else if ( ( t->binding == T_BIND_EXISTS ) && ( last > t->time ) )
    {
#ifdef OPT_GRAPH_DEBUG_EXT
        oldTimeStamp = 1;
#endif
        fate = T_FATE_OUTDATED;
    }
    else if ( ( t->binding == T_BIND_PARENTS ) && ( last > p->time ) )
    {
#ifdef OPT_GRAPH_DEBUG_EXT
        oldTimeStamp = 1;
#endif
        fate = T_FATE_NEEDTMP;
    }
    else if ( ( t->binding == T_BIND_PARENTS ) && ( hlast > p->time ) )
    {
        fate = T_FATE_NEEDTMP;
    }
    else if ( t->flags & T_FLAG_TOUCHED )
    {
        fate = T_FATE_TOUCHED;
    }
    else if ( anyhow && !( t->flags & T_FLAG_NOUPDATE ) )
    {
        fate = T_FATE_TOUCHED;
    }
    else if ( ( t->binding == T_BIND_EXISTS ) && ( t->flags & T_FLAG_TEMP ) )
    {
        fate = T_FATE_ISTMP;
    }
    else if ( ( t->binding == T_BIND_EXISTS ) && p &&
         ( p->binding != T_BIND_UNBOUND ) && ( t->time > p->time ) )
    {
#ifdef OPT_GRAPH_DEBUG_EXT
        oldTimeStamp = 1;
#endif
        fate = T_FATE_NEWER;
    }
    else
    {
        fate = T_FATE_STABLE;
    }
#ifdef OPT_GRAPH_DEBUG_EXT
    if ( DEBUG_FATE && ( fate != savedFate ) )
	{
        if ( savedFate == T_FATE_STABLE )
            printf( "fate change  %s set to %s%s\n", t->name,
                target_fate[ fate ], oldTimeStamp ? " (by timestamp)" : "" );
        else
            printf( "fate change  %s from %s to %s%s\n", t->name,
                target_fate[ savedFate ], target_fate[ fate ],
                oldTimeStamp ? " (by timestamp)" : "" );
	}
#endif

    /* Step 4e: handle missing files */
    /* If it is missing and there are no actions to create it, boom. */
    /* If we can not make a target we do not care about it, okay. */
    /* We could insist that there are updating actions for all missing */
    /* files, but if they have dependencies we just pretend it is a NOTFILE. */

    if ( ( fate == T_FATE_MISSING ) && !t->actions && !t->depends )
    {
        if ( t->flags & T_FLAG_NOCARE )
        {
#ifdef OPT_GRAPH_DEBUG_EXT
            if ( DEBUG_FATE )
                printf( "fate change %s to STABLE from %s, "
                    "no actions, no dependencies and do not care\n",
                    t->name, target_fate[ fate ] );
#endif
            fate = T_FATE_STABLE;
        }
        else
        {
            printf( "don't know how to make %s\n", t->name );
            fate = T_FATE_CANTFIND;
        }
    }

    /* Step 4f: propagate dependencies' time & fate. */
    /* Set leaf time to be our time only if this is a leaf. */

    t->time = max( t->time, last );
    t->leaf = leaf ? leaf : t->time ;
    /* This target's fate may have been updated by virtue of following some
     * target's rebuilds list, so only allow it to be increased to the fate we
     * have calculated. Otherwise, grab its new fate.
     */
    if ( fate > t->fate )
        t->fate = fate;
    else
        fate = t->fate;

    /* Step 4g: if this target needs to be built, force rebuild everything in
     * this target's rebuilds list.
     */
    if ( ( fate >= T_FATE_BUILD ) && ( fate < T_FATE_BROKEN ) )
        force_rebuilds( t );

    /*
     * Step 5: sort dependencies by their update time.
     */

    if ( globs.newestfirst )
        t->depends = make0sort( t->depends );

    /*
     * Step 6: a little harmless tabulating for tracing purposes
     */

    /* Do not count or report interal includes nodes. */
    if ( t->flags & T_FLAG_INTERNAL )
        return;

    if ( counts )
    {
#ifdef OPT_IMPROVED_PATIENCE_EXT
        ++counts->targets;
#else
        if ( !( ++counts->targets % 1000 ) && DEBUG_MAKE )
            printf( "...patience...\n" );
#endif

        if ( fate == T_FATE_ISTMP )
            ++counts->temp;
        else if ( fate == T_FATE_CANTFIND )
            ++counts->cantfind;
        else if ( ( fate == T_FATE_CANTMAKE ) && t->actions )
            ++counts->cantmake;
        else if ( ( fate >= T_FATE_BUILD ) && ( fate < T_FATE_BROKEN ) &&
            t->actions )
            ++counts->updating;
    }

    if ( !( t->flags & T_FLAG_NOTFILE ) && ( fate >= T_FATE_SPOIL ) )
        flag = "+";
    else if ( ( t->binding == T_BIND_EXISTS ) && p && ( t->time > p->time ) )
        flag = "*";

    if ( DEBUG_MAKEPROG )
        printf( "made%s\t%s\t%s%s\n", flag, target_fate[ (int) t->fate ],
            spaces( depth ), t->name );
}


#ifdef OPT_GRAPH_DEBUG_EXT

static const char * target_name( TARGET * t )
{
    static char buf[ 1000 ];
    if ( t->flags & T_FLAG_INTERNAL )
    {
        sprintf( buf, "%s (internal node)", t->name );
        return buf;
    }
    return t->name;
}


/*
 * dependGraphOutput() - output the DG after make0 has run.
 */

static void dependGraphOutput( TARGET * t, int depth )
{
    TARGETS * c;

    if ( ( t->flags & T_FLAG_VISITED ) || !t->name || !t->boundname )
        return;

    t->flags |= T_FLAG_VISITED;

    switch ( t->fate )
    {
    case T_FATE_TOUCHED:
    case T_FATE_MISSING:
    case T_FATE_OUTDATED:
    case T_FATE_UPDATE:
        printf( "->%s%2d Name: %s\n", spaces( depth ), depth, target_name( t ) );
        break;
    default:
        printf( "  %s%2d Name: %s\n", spaces( depth ), depth, target_name( t ) );
        break;
    }

    if ( strcmp( t->name, t->boundname ) )
        printf( "  %s    Loc: %s\n", spaces( depth ), t->boundname );

    switch ( t->fate )
    {
    case T_FATE_STABLE:
        printf( "  %s       : Stable\n", spaces( depth ) );
        break;
    case T_FATE_NEWER:
        printf( "  %s       : Newer\n", spaces( depth ) );
        break;
    case T_FATE_ISTMP:
        printf( "  %s       : Up to date temp file\n", spaces( depth ) );
        break;
    case T_FATE_NEEDTMP:
        printf( "  %s       : Temporary file, to be updated\n", spaces( depth ) );
        break;
    case T_FATE_TOUCHED:
        printf( "  %s       : Been touched, updating it\n", spaces( depth ) );
        break;
    case T_FATE_MISSING:
        printf( "  %s       : Missing, creating it\n", spaces( depth ) );
        break;
    case T_FATE_OUTDATED:
        printf( "  %s       : Outdated, updating it\n", spaces( depth ) );
        break;
    case T_FATE_REBUILD:
        printf( "  %s       : Rebuild, updating it\n", spaces( depth ) );
        break;
    case T_FATE_UPDATE:
        printf( "  %s       : Updating it\n", spaces( depth ) );
        break;
    case T_FATE_CANTFIND:
        printf( "  %s       : Can not find it\n", spaces( depth ) );
        break;
    case T_FATE_CANTMAKE:
        printf( "  %s       : Can make it\n", spaces( depth ) );
        break;
    }

    if ( t->flags & ~T_FLAG_VISITED )
    {
        printf( "  %s       : ", spaces( depth ) );
        if ( t->flags & T_FLAG_TEMP     ) printf( "TEMPORARY " );
        if ( t->flags & T_FLAG_NOCARE   ) printf( "NOCARE "    );
        if ( t->flags & T_FLAG_NOTFILE  ) printf( "NOTFILE "   );
        if ( t->flags & T_FLAG_TOUCHED  ) printf( "TOUCHED "   );
        if ( t->flags & T_FLAG_LEAVES   ) printf( "LEAVES "    );
        if ( t->flags & T_FLAG_NOUPDATE ) printf( "NOUPDATE "  );
        printf( "\n" );
    }

    for ( c = t->depends; c; c = c->next )
    {
        printf( "  %s       : Depends on %s (%s)", spaces( depth ),
               target_name( c->target ), target_fate[ (int) c->target->fate ] );
        if ( c->target->time == t->time )
            printf( " (max time)");
        printf( "\n" );
    }

    for ( c = t->depends; c; c = c->next )
        dependGraphOutput( c->target, depth + 1 );
}
#endif


/*
 * make0sort() - reorder TARGETS chain by their time (newest to oldest).
 *
 * We walk chain, taking each item and inserting it on the sorted result, with
 * newest items at the front. This involves updating each of the TARGETS'
 * c->next and c->tail. Note that we make c->tail a valid prev pointer for every
 * entry. Normally, it is only valid at the head, where prev == tail. Note also
 * that while tail is a loop, next ends at the end of the chain.
 */

static TARGETS * make0sort( TARGETS * chain )
{
    PROFILE_ENTER( MAKE_MAKE0SORT );

    TARGETS * result = 0;

    /* Walk the current target list. */
    while ( chain )
    {
        TARGETS * c = chain;
        TARGETS * s = result;

        chain = chain->next;

        /* Find point s in result for c. */
        while ( s && ( s->target->time > c->target->time ) )
            s = s->next;

        /* Insert c in front of s (might be 0). Do not even think of deciphering
         * this.
         */
        c->next = s;                           /* good even if s = 0       */
        if ( result == s ) result = c;         /* new head of chain?       */
        if ( !s ) s = result;                  /* wrap to ensure a next    */
        if ( result != c ) s->tail->next = c;  /* not head? be prev's next */
        c->tail = s->tail;                     /* take on next's prev      */
        s->tail = c;                           /* make next's prev us      */
    }

    PROFILE_EXIT( MAKE_MAKE0SORT );
    return result;
}


static LIST * targets_to_update_ = 0;


void mark_target_for_updating( char * target )
{
    targets_to_update_ = list_new( targets_to_update_, target );
}


LIST * targets_to_update()
{
    return targets_to_update_;
}


void clear_targets_to_update()
{
    list_free( targets_to_update_ );
    targets_to_update_ = 0;
}