This file is indexed.

/usr/share/boost-build/tools/doxygen.jam is in libboost1.49-dev 1.49.0-3.2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  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
# Copyright 2003, 2004 Douglas Gregor
# Copyright 2003, 2004, 2005 Vladimir Prus
# Copyright 2006 Rene Rivera
# 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)

# This module defines rules to handle generation of various outputs from source
# files documented with doxygen comments. The supported transformations are:
#
# * Source -> Doxygen XML -> BoostBook XML
# * Source -> Doxygen HTML
#
# The type of transformation is selected based on the target requested. For
# BoostBook XML, the default, specifying a target with an ".xml" suffix, or an
# empty suffix, will produce a <target>.xml and <target>.boostbook. For Doxygen
# HTML specifying a target with an ".html" suffix will produce a directory
# <target> with the Doxygen html files, and a <target>.html file redirecting to
# that directory.

import "class" : new ;
import targets ;
import feature ;
import property ;
import generators ;
import boostbook ;
import type ;
import path ;
import print ;
import regex ;
import stage ;
import project ;
import xsltproc ;
import make ;
import os ;
import toolset : flags ;
import alias ;
import common ;
import modules ;
import project ;
import utility ;
import errors ;


# Use to specify extra configuration paramters. These get translated
# into a doxyfile which configures the building of the docs.
feature.feature doxygen:param : : free ;

# Specify the "<xsl:param>boost.doxygen.header.prefix" XSLT option.
feature.feature prefix : : free ;

# Specify the "<xsl:param>boost.doxygen.reftitle" XSLT option.
feature.feature reftitle : : free ;

# Which processor to use for various translations from Doxygen.
feature.feature doxygen.processor : xsltproc doxproc : propagated implicit ;

# To generate, or not, index sections.
feature.feature doxygen.doxproc.index : no yes : propagated incidental ;

# The ID for the resulting BoostBook reference section.
feature.feature doxygen.doxproc.id : : free ;

# The title for the resulting BoostBook reference section.
feature.feature doxygen.doxproc.title : : free ;

# Location for images when generating XML
feature.feature doxygen:xml-imagedir : : free ;

# Indicates whether the entire directory should be deleted
feature.feature doxygen.rmdir : off on : optional incidental ;

# Doxygen configuration input file.
type.register DOXYFILE : doxyfile ;

# Doxygen XML multi-file output.
type.register DOXYGEN_XML_MULTIFILE : xml-dir : XML ;

# Doxygen XML coallesed output.
type.register DOXYGEN_XML : doxygen : XML ;

# Doxygen HTML multifile directory.
type.register DOXYGEN_HTML_MULTIFILE : html-dir : HTML ;

# Redirection HTML file to HTML multifile directory.
type.register DOXYGEN_HTML : : HTML ;

type.register DOXYGEN_XML_IMAGES : doxygen-xml-images ;

# Initialize the Doxygen module. Parameters are:
#   name: the name of the 'doxygen' executable. If not specified, the name
#         'doxygen' will be used
#
rule init ( name ? )
{
    if ! $(.initialized)
    {
        .initialized = true ;

        .doxproc = [ modules.binding $(__name__) ] ;
        .doxproc = $(.doxproc:D)/doxproc.py ;

        generators.register-composing doxygen.headers-to-doxyfile
            : H HPP CPP : DOXYFILE ;
        generators.register-standard doxygen.run
            : DOXYFILE : DOXYGEN_XML_MULTIFILE ;
        generators.register-standard doxygen.xml-dir-to-boostbook
            : DOXYGEN_XML_MULTIFILE : BOOSTBOOK : <doxygen.processor>doxproc ;
        generators.register-standard doxygen.xml-to-boostbook
            : DOXYGEN_XML : BOOSTBOOK : <doxygen.processor>xsltproc ;
        generators.register-standard doxygen.collect
            : DOXYGEN_XML_MULTIFILE : DOXYGEN_XML ;
        generators.register-standard doxygen.run
            : DOXYFILE : DOXYGEN_HTML_MULTIFILE ;
        generators.register-standard doxygen.html-redirect
            : DOXYGEN_HTML_MULTIFILE : DOXYGEN_HTML ;
        generators.register-standard doxygen.copy-latex-pngs
            : DOXYGEN_HTML : DOXYGEN_XML_IMAGES ;

        IMPORT $(__name__) : doxygen : : doxygen ;
    }

    if $(name)
    {
        modify-config ;
        .doxygen = $(name) ;
        check-doxygen ;
    }

    if ! $(.doxygen)
    {
        check-doxygen ;
    }
}

rule freeze-config ( )
{
    if ! $(.initialized)
    {
        errors.user-error "doxygen must be initialized before it can be used." ;
    }
    if ! $(.config-frozen)
    {
        .config-frozen = true ;

        if [ .is-cygwin ]
        {
            .is-cygwin = true ;
        }
    }
}

rule modify-config ( )
{
    if $(.config-frozen)
    {
        errors.user-error "Cannot change doxygen after it has been used." ;
    }
}

rule check-doxygen ( )
{
    if --debug-configuration in [ modules.peek : ARGV ]
    {
        ECHO "notice:" using doxygen ":" $(.doxygen) ;
    }
    local extra-paths ;
    if [ os.name ] = NT
    {
        local ProgramFiles = [ modules.peek : ProgramFiles ] ;
        if $(ProgramFiles)
        {
            extra-paths = "$(ProgramFiles:J= )" ;
        }
        else
        {
            extra-paths = "C:\\Program Files" ;
        }
    }
    .doxygen = [ common.get-invocation-command doxygen :
                 doxygen : $(.doxygen) : $(extra-paths) ] ;
}

rule name ( )
{
    freeze-config ;
    return $(.doxygen) ;
}

rule .is-cygwin ( )
{
    if [ os.on-windows ]
    {
        local file = [ path.make [ modules.binding $(__name__) ] ] ;
        local dir = [ path.native
                      [ path.join [ path.parent $(file) ] doxygen ] ] ;
        local command =
         "cd \"$(dir)\" && \"$(.doxygen)\" windows-paths-check.doxyfile 2>&1" ;
        result = [ SHELL $(command) ] ;
        if [ MATCH "(Parsing file /)" : $(result) ]
        {
            return true ;
        }
    }
}

# Runs Doxygen on the given Doxygen configuration file (the source) to generate
# the Doxygen files. The output is dumped according to the settings in the
# Doxygen configuration file, not according to the target! Because of this, we
# essentially "touch" the target file, in effect making it look like we have
# really written something useful to it. Anyone that uses this action must deal
# with this behavior.
#
actions doxygen-action
{
    $(RM) "$(*.XML)" & "$(NAME:E=doxygen)" "$(>)" && echo "Stamped" > "$(<)"
}


# Runs the Python doxproc XML processor.
#
actions doxproc
{
    python "$(DOXPROC)" "--xmldir=$(>)" "--output=$(<)" "$(OPTIONS)" "--id=$(ID)" "--title=$(TITLE)"
}


rule translate-path ( path )
{
    freeze-config ;
    if [ os.on-windows ]
    {
        if [ os.name ] = CYGWIN
        {
            if $(.is-cygwin)
            {
                return $(path) ;
            }
            else
            {
                return $(path:W) ;
            }
        }
        else
        {
            if $(.is-cygwin)
            {
                match = [ MATCH ^(.):(.*) : $(path) ] ;
                if $(match)
                {
                    return /cygdrive/$(match[1])$(match[2]:T) ;
                }
                else
                {
                    return $(path:T) ;
                }
            }
            else
            {
                return $(path) ;
            }
        }
    }
    else
    {
        return $(path) ;
    }
}


# Generates a doxygen configuration file (doxyfile) given a set of C++ sources
# and a property list that may contain <doxygen:param> features.
#
rule headers-to-doxyfile ( target : sources * : properties * )
{
    local text "# Generated by Boost.Build version 2" ;

    local output-dir ;

    # Translate <doxygen:param> into command line flags.
    for local param in [ feature.get-values <doxygen:param> : $(properties) ]
    {
        local namevalue = [ regex.match ([^=]*)=(.*) : $(param) ] ;
        if $(namevalue[1]) = OUTPUT_DIRECTORY
        {
            output-dir = [ translate-path
                           [ utility.unquote $(namevalue[2]) ] ] ;
            text += "OUTPUT_DIRECTORY = \"$(output-dir)\"" ;
        }
        else
        {
            text += "$(namevalue[1]) = $(namevalue[2])" ;
        }
    }

    if ! $(output-dir)
    {
        output-dir = [ translate-path [ on $(target) return $(LOCATE) ] ] ;
        text += "OUTPUT_DIRECTORY = \"$(output-dir)\"" ;
    }

    local headers = ;
    for local header in $(sources:G=)
    {
        header = [ translate-path $(header) ] ;
        headers += \"$(header)\" ;
    }

    # Doxygen generates LaTex by default. So disable it unconditionally, or at
    # least until someone needs, and hence writes support for, LaTex output.
    text += "GENERATE_LATEX = NO" ;
    text += "INPUT = $(headers:J= )" ;
    print.output $(target) plain ;
    print.text $(text) : true ;
}


# Run Doxygen. See doxygen-action for a description of the strange properties of
# this rule.
#
rule run ( target : source : properties * )
{
    freeze-config ;
    if <doxygen.rmdir>on in $(properties)
    {
        local output-dir =
            [ path.make
                [ MATCH <doxygen:param>OUTPUT_DIRECTORY=\"?([^\"]*) :
                  $(properties) ] ] ;
        local html-dir =
            [ path.make
                [ MATCH <doxygen:param>HTML_OUTPUT=(.*) :
                  $(properties) ] ] ;
        if $(output-dir) && $(html-dir) &&
            [ path.glob $(output-dir) : $(html-dir) ]
        {
            HTMLDIR on $(target) =
                [ path.native [ path.join $(output-dir) $(html-dir) ] ] ;
            rm-htmldir $(target) ;
        }
    }
    doxygen-action $(target) : $(source) ;
    NAME on $(target) = $(.doxygen) ;
    RM on $(target) = [ modules.peek common : RM ] ;
    *.XML on $(target) =
        [ path.native
            [ path.join
                [ path.make [ on $(target) return $(LOCATE) ] ]
                $(target:B:S=)
                *.xml ] ] ;
}

if [ os.name ] = NT
{
    RMDIR = rmdir /s /q ;
}
else
{
    RMDIR = rm -rf ;
}

actions quietly rm-htmldir
{
    $(RMDIR) $(HTMLDIR)
}

# The rules below require Boost.Book stylesheets, so we need some code to check
# that the boostbook module has actualy been initialized.
#
rule check-boostbook ( )
{
    if ! [ modules.peek boostbook : .initialized ]
    {
        ECHO "error: the boostbook module is not initialized" ;
        ECHO "error: you've attempted to use the 'doxygen' toolset, " ;
        ECHO "error: which requires Boost.Book," ;
        ECHO "error: but never initialized Boost.Book." ;
        EXIT "error: Hint: add 'using boostbook ;' to your user-config.jam" ;
    }
}


# Collect the set of Doxygen XML files into a single XML source file that can be
# handled by an XSLT processor. The source is completely ignored (see
# doxygen-action), because this action picks up the Doxygen XML index file
# xml/index.xml. This is because we can not teach Doxygen to act like a NORMAL
# program and take a "-o output.xml" argument (grrrr). The target of the
# collection will be a single Doxygen XML file.
#
rule collect ( target : source : properties * )
{
    check-boostbook ;
    local collect-xsl-dir
        = [ path.native [ path.join [ boostbook.xsl-dir ] doxygen collect ] ] ;
    local source-path
        = [ path.make [ on $(source) return $(LOCATE) ] ] ;
    local collect-path
        = [ path.root [ path.join $(source-path) $(source:B) ] [ path.pwd ] ] ;
    local native-path
        = [ path.native $(collect-path) ] ;
    local real-source
        = [ path.native [ path.join $(collect-path) index.xml ] ] ;
    xsltproc.xslt $(target) : $(real-source) $(collect-xsl-dir:S=.xsl)
        : <xsl:param>doxygen.xml.path=$(native-path) ;
}


# Translate Doxygen XML into BoostBook.
#
rule xml-to-boostbook ( target : source : properties * )
{
    check-boostbook ;
    local xsl-dir = [ boostbook.xsl-dir ] ;
    local d2b-xsl = [ path.native [ path.join [ boostbook.xsl-dir ] doxygen
        doxygen2boostbook.xsl ] ] ;

    local xslt-properties = $(properties) ;
    for local prefix in [ feature.get-values <prefix> : $(properties) ]
    {
        xslt-properties += "<xsl:param>boost.doxygen.header.prefix=$(prefix)" ;
    }
    for local title in [ feature.get-values <reftitle> : $(properties) ]
    {
        xslt-properties += "<xsl:param>boost.doxygen.reftitle=$(title)" ;
    }

    xsltproc.xslt $(target) : $(source) $(d2b-xsl) : $(xslt-properties) ;
}


flags doxygen.xml-dir-to-boostbook OPTIONS <doxygen.doxproc.index>yes : --enable-index ;
flags doxygen.xml-dir-to-boostbook ID <doxygen.doxproc.id> ;
flags doxygen.xml-dir-to-boostbook TITLE <doxygen.doxproc.title> ;


rule xml-dir-to-boostbook ( target : source : properties * )
{
    DOXPROC on $(target) = $(.doxproc) ;

    LOCATE on $(source:S=) = [ on $(source) return $(LOCATE) ] ;

    doxygen.doxproc $(target) : $(source:S=) ;
}


# Generate the HTML redirect to HTML dir index.html file.
#
rule html-redirect ( target : source : properties * )
{
    local uri = "$(target:B)/index.html" ;
    print.output $(target) plain ;
    print.text
"<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Strict//EN\"
    \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd\">
<html xmlns=\"http://www.w3.org/1999/xhtml\">
<head>
  <meta http-equiv=\"refresh\" content=\"0; URL=$(uri)\" />

  <title></title>
</head>

<body>
  Automatic redirection failed, please go to <a href=
  \"$(uri)\">$(uri)</a>.
</body>
</html>
"
        : true ;
}

rule copy-latex-pngs ( target : source : requirements * )
{
    local directory = [ path.native
                        [ feature.get-values <doxygen:xml-imagedir> :
                          $(requirements) ] ] ;

    local location = [ on $(target) return $(LOCATE) ] ;

    local pdf-location =
        [ path.native
            [ path.join
                [ path.make $(location) ]
                [ path.make $(directory) ] ] ] ;
    local html-location =
        [ path.native
            [ path.join
                .
                html
                [ path.make $(directory) ] ] ] ;

    common.MkDir $(pdf-location) ;
    common.MkDir $(html-location) ;

    DEPENDS $(target) : $(pdf-location) $(html-location) ;

    if [ os.name ] = NT
    {
        CP on $(target) = copy /y ;
        FROM on $(target) = \\*.png ;
        TOHTML on $(target) = .\\html\\$(directory) ;
        TOPDF on $(target) = \\$(directory) ;
    }
    else
    {
        CP on $(target) = cp ;
        FROM on $(target) = /*.png ;
        TOHTML on $(target) = ./html/$(directory) ;
        TOPDF on $(target) = $(target:D)/$(directory) ;
    }
}

actions copy-latex-pngs
{
    $(CP) $(>:S=)$(FROM) $(TOHTML)
    $(CP) $(>:S=)$(FROM) $(<:D)$(TOPDF)
    echo "Stamped" > "$(<)"
}

# building latex images for doxygen XML depends
# on latex, dvips, and ps being in your PATH.
# This is true for most Unix installs, but
# not on Win32, where you will need to install
# MkTex and Ghostscript and add these tools
# to your path.

actions check-latex
{
    latex -version >$(<)
}

actions check-dvips
{
    dvips -version >$(<)
}

if [ os.name ] = "NT"
{
   actions check-gs
   {
       gswin32c -version >$(<)
   }
}
else
{
   actions check-gs
   {
       gs -version >$(<)
   }
}

rule check-tools ( )
{
    if ! $(.check-tools-targets)
    {
        # Find the root project.
        local root-project = [ project.current ] ;
        root-project = [ $(root-project).project-module ] ;
        while
            [ project.attribute $(root-project) parent-module ] &&
            [ project.attribute $(root-project) parent-module ] != user-config
        {
            root-project =
                [ project.attribute $(root-project) parent-module ] ;
        }

        .latex.check = [ new file-target latex.check
            :
            : [ project.target $(root-project) ]
            : [ new action : doxygen.check-latex ]
            :
            ] ;
        .dvips.check = [ new file-target dvips.check
            :
            : [ project.target $(root-project) ]
            : [ new action : doxygen.check-dvips ]
            :
            ] ;
        .gs.check = [ new file-target gs.check
            :
            : [ project.target $(root-project) ]
            : [ new action : doxygen.check-gs ]
            :
            ] ;
        .check-tools-targets = $(.latex.check) $(.dvips.check) $(.gs.check) ;
    }
    return $(.check-tools-targets) ;
}

project.initialize $(__name__) ;
project doxygen ;

class doxygen-check-tools-target-class : basic-target
{
    import doxygen ;
    rule construct ( name : sources * : property-set )
    {
        return [ property-set.empty ] [ doxygen.check-tools ] ;
    }
}

local project = [ project.current ] ;

targets.main-target-alternative
    [ new doxygen-check-tools-target-class check-tools : $(project)
        : [ targets.main-target-sources : check-tools : no-renaming ]
        : [ targets.main-target-requirements : $(project) ]
        : [ targets.main-target-default-build : $(project) ]
        : [ targets.main-target-usage-requirements : $(project) ]
    ] ;

# User-level rule to generate BoostBook XML from a set of headers via Doxygen.
#
rule doxygen ( target : sources * : requirements * : default-build * : usage-requirements * )
{
    freeze-config ;
    local project = [ project.current ] ;

    if $(target:S) = .html
    {
        # Build an HTML directory from the sources.
        local html-location = [ feature.get-values <location> : $(requirements) ] ;
        local output-dir ;
        if [ $(project).get build-dir ] 
        {
            # Explicitly specified build dir. Add html at the end.
            output-dir = [ path.join [ $(project).build-dir ] $(html-location:E=html) ] ;
        }
        else
        {
            # Trim 'bin' from implicit build dir, for no other reason that backward
            # compatibility.
            output-dir = [ path.join [ path.parent [ $(project).build-dir ] ] 
              $(html-location:E=html) ] ;
        }
        output-dir = [ path.root $(output-dir) [ path.pwd ] ] ;        
        local output-dir-native = [ path.native $(output-dir) ] ;
        requirements = [ property.change $(requirements) : <location> ] ;

        ## The doxygen configuration file.
        targets.main-target-alternative
            [ new typed-target $(target:S=.tag) : $(project) : DOXYFILE
                : [ targets.main-target-sources $(sources) : $(target:S=.tag) ]
                : [ targets.main-target-requirements $(requirements)
                    <doxygen:param>GENERATE_HTML=YES
                    <doxygen:param>GENERATE_XML=NO
                    <doxygen:param>"OUTPUT_DIRECTORY=\"$(output-dir-native)\""
                    <doxygen:param>HTML_OUTPUT=$(target:B)
                    : $(project) ]
                : [ targets.main-target-default-build $(default-build) : $(project) ]
            ] ;
        $(project).mark-target-as-explicit $(target:S=.tag) ;

        ## The html directory to generate by running doxygen.
        targets.main-target-alternative
            [ new typed-target $(target:S=.dir) : $(project) : DOXYGEN_HTML_MULTIFILE
                : $(target:S=.tag)
                : [ targets.main-target-requirements $(requirements)
                    <doxygen:param>"OUTPUT_DIRECTORY=\"$(output-dir-native)\""
                    <doxygen:param>HTML_OUTPUT=$(target:B)
                    : $(project) ]
                : [ targets.main-target-default-build $(default-build) : $(project) ]
                ] ;
        $(project).mark-target-as-explicit $(target:S=.dir) ;

        ## The redirect html file into the generated html.
        targets.main-target-alternative
            [ new typed-target $(target) : $(project) : DOXYGEN_HTML
                : $(target:S=.dir)
                : [ targets.main-target-requirements $(requirements)
                    <location>$(output-dir)
                    : $(project) ]
                : [ targets.main-target-default-build $(default-build) : $(project) ]
                ] ;
    }
    else
    {
        # Build a BoostBook XML file from the sources.
        local location-xml = [ feature.get-values <location> : $(requirements) ] ;
        requirements = [ property.change $(requirements) : <location> ] ;
        local target-xml = $(target:B=$(target:B)-xml) ;

        # Check whether we need to build images
        local images-location =
            [ feature.get-values <doxygen:xml-imagedir> : $(requirements) ] ;
        if $(images-location)
        {
            doxygen $(target).doxygen-xml-images.html : $(sources)
                : $(requirements)
                  <doxygen.rmdir>on
                  <doxygen:param>QUIET=YES
                  <doxygen:param>WARNINGS=NO
                  <doxygen:param>WARN_IF_UNDOCUMENTED=NO
                  <dependency>/doxygen//check-tools ;
            $(project).mark-target-as-explicit
                $(target).doxygen-xml-images.html ;

            targets.main-target-alternative
                [ new typed-target $(target).doxygen-xml-images
                    : $(project) : DOXYGEN_XML_IMAGES
                    : $(target).doxygen-xml-images.html
                    : [ targets.main-target-requirements $(requirements)
                        : $(project) ]
                    : [ targets.main-target-default-build $(default-build)
                        : $(project) ]
                ] ;

            $(project).mark-target-as-explicit
                $(target).doxygen-xml-images ;

            if ! [ regex.match "^(.*/)$" : $(images-location) ]
            {
                images-location = $(images-location)/ ;
            }

            requirements +=
                <dependency>$(target).doxygen-xml-images
                <xsl:param>boost.doxygen.formuladir=$(images-location) ;
        }

        ## The doxygen configuration file.
        targets.main-target-alternative
            [ new typed-target $(target-xml:S=.tag) : $(project) : DOXYFILE
                : [ targets.main-target-sources $(sources) : $(target-xml:S=.tag) ]
                : [ targets.main-target-requirements $(requirements)
                    <doxygen:param>GENERATE_HTML=NO
                    <doxygen:param>GENERATE_XML=YES
                    <doxygen:param>XML_OUTPUT=$(target-xml)
                    : $(project) ]
                : [ targets.main-target-default-build $(default-build) : $(project) ]
            ] ;
        $(project).mark-target-as-explicit $(target-xml:S=.tag) ;

        ## The Doxygen XML directory of the processed source files.
        targets.main-target-alternative
            [ new typed-target $(target-xml:S=.dir) : $(project) : DOXYGEN_XML_MULTIFILE
                : $(target-xml:S=.tag)
                : [ targets.main-target-requirements $(requirements)
                    : $(project) ]
                : [ targets.main-target-default-build $(default-build) : $(project) ]
            ] ;
        $(project).mark-target-as-explicit $(target-xml:S=.dir) ;

        ## The resulting BoostBook file is generated by the processor tool. The
        ## tool can be either the xsltproc plus accompanying XSL scripts. Or it
        ## can be the python doxproc.py script.
        targets.main-target-alternative
            [ new typed-target $(target-xml) : $(project) : BOOSTBOOK
                :  $(target-xml:S=.dir)
                : [ targets.main-target-requirements $(requirements)
                    : $(project) ]
                : [ targets.main-target-default-build $(default-build) : $(project) ]
            ] ;
        $(project).mark-target-as-explicit $(target-xml) ;

        targets.main-target-alternative
            [ new install-target-class $(target:S=.xml) : $(project)
                : $(target-xml)
                : [ targets.main-target-requirements $(requirements)
                    <location>$(location-xml:E=.)
                    <name>$(target:S=.xml)
                    : $(project) ]
                : [ targets.main-target-default-build $(default-build) : $(project) ]
            ] ;
        $(project).mark-target-as-explicit $(target:S=.xml) ;

        targets.main-target-alternative
            [ new alias-target-class $(target) : $(project)
                :
                : [ targets.main-target-requirements $(requirements)
                    : $(project) ]
                : [ targets.main-target-default-build $(default-build) : $(project) ]
                : [ targets.main-target-usage-requirements $(usage-requirements)
                    <dependency>$(target:S=.xml)
                    : $(project) ]
            ] ;
    }
}