aboutsummaryrefslogtreecommitdiff
path: root/libbuild2/bin/init.cxx
blob: 069315f20818e66cab737ccd225b3981bd760bdc (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
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
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
// file      : build2/bin/init.cxx -*- C++ -*-
// copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
// license   : MIT; see accompanying LICENSE file

#include <libbuild2/bin/init.hxx>

#include <map>

#include <libbuild2/scope.hxx>
#include <libbuild2/variable.hxx>
#include <libbuild2/diagnostics.hxx>

#include <libbuild2/config/utility.hxx>

#include <libbuild2/test/module.hxx>

#include <libbuild2/install/rule.hxx>
#include <libbuild2/install/utility.hxx>

#include <libbuild2/bin/rule.hxx>
#include <libbuild2/bin/guess.hxx>
#include <libbuild2/bin/target.hxx>
#include <libbuild2/bin/utility.hxx>

using namespace std;
using namespace butl;

namespace build2
{
  namespace bin
  {
    static const fail_rule fail_;
    static const lib_rule lib_;

    // Default config.bin.*.lib values.
    //
    static const strings exe_lib {"shared", "static"};
    static const strings liba_lib {"static", "shared"};
    static const strings libs_lib {"shared", "static"};

    bool
    vars_init (scope& rs,
               scope&,
               const location&,
               bool first,
               bool,
               module_init_extra&)
    {
      tracer trace ("bin::vars_init");
      l5 ([&]{trace << "for " << rs;});

      assert (first);

      // Enter variables. Note: some overridable, some not.
      //
      // Target is a string and not target_triplet because it can be
      // specified by the user.
      //
      auto& vp (rs.var_pool ());

      const auto vis_tgt (variable_visibility::target);
      const auto vis_prj (variable_visibility::project);

      vp.insert<string>    ("config.bin.target",   true);
      vp.insert<string>    ("config.bin.pattern",  true);

      // Library types to build.
      //
      vp.insert<string>    ("config.bin.lib",      true);

      // Library types to use (in priority order).
      //
      vp.insert<strings>   ("config.bin.exe.lib",  true);
      vp.insert<strings>   ("config.bin.liba.lib", true);
      vp.insert<strings>   ("config.bin.libs.lib", true);

      // The rpath[_link].auto flag controls automatic rpath behavior, for
      // example, addition of rpaths for prerequisite libraries (see the cc
      // module for an example). Default is true.
      //
      vp.insert<dir_paths> ("config.bin.rpath",      true);
      vp.insert<bool>      ("config.bin.rpath.auto", true);

      vp.insert<dir_paths> ("config.bin.rpath_link",      true);
      vp.insert<bool>      ("config.bin.rpath_link.auto", true);

      vp.insert<string>    ("config.bin.prefix", true);
      vp.insert<string>    ("config.bin.suffix", true);
      vp.insert<string>    ("config.bin.lib.prefix", true);
      vp.insert<string>    ("config.bin.lib.suffix", true);
      vp.insert<string>    ("config.bin.exe.prefix", true);
      vp.insert<string>    ("config.bin.exe.suffix", true);

      vp.insert<string>    ("bin.lib");

      vp.insert<strings>   ("bin.exe.lib");
      vp.insert<strings>   ("bin.liba.lib");
      vp.insert<strings>   ("bin.libs.lib");

      vp.insert<dir_paths> ("bin.rpath");
      vp.insert<bool>      ("bin.rpath.auto");

      vp.insert<dir_paths> ("bin.rpath_link");
      vp.insert<bool>      ("bin.rpath_link.auto");

      // Link whole archive. Note: non-overridable with target visibility.
      //
      // The lookup semantics is as follows: we first look for a prerequisite-
      // specific value, then for a target-specific value in the library being
      // linked, and then for target type/pattern-specific value starting from
      // the scope of the target being linked-to. In that final lookup we do
      // not look in the target being linked-to itself since that is used to
      // indicate how this target should be linked to other targets. For
      // example:
      //
      // exe{test}: liba{foo}
      // liba{foo}: libua{foo1 foo2}
      // liba{foo}: bin.whole = false # Affects test but not foo1 and foo2.
      //
      // If unspecified, defaults to false for liba{} and to true for libu*{}.
      //
      vp.insert<bool>      ("bin.whole", vis_tgt);

      vp.insert<string>    ("bin.exe.prefix");
      vp.insert<string>    ("bin.exe.suffix");
      vp.insert<string>    ("bin.lib.prefix");
      vp.insert<string>    ("bin.lib.suffix");

      // The optional custom clean patterns should be just the pattern stem,
      // without the library prefix/name or extension. For example, `-[A-Z]`
      // instead of `libfoo-[A-Z].so`. Note that the custom version pattern is
      // only used for platform-independent versions (for platforms-specific
      // versions we can always derive the pattern automatically).
      //
      vp.insert<string> ("bin.lib.load_suffix", vis_prj);
      vp.insert<string> ("bin.lib.load_suffix_pattern", vis_prj);

      vp.insert<map<string, string>> ("bin.lib.version", vis_prj);
      vp.insert<string>              ("bin.lib.version_pattern", vis_prj);

      return true;
    }

    bool
    config_init (scope& rs,
                 scope& bs,
                 const location& loc,
                 bool first,
                 bool,
                 module_init_extra& extra)
    {
      tracer trace ("bin::config_init");
      l5 ([&]{trace << "for " << bs;});

      // We only support root loading (which means there can only be one).
      //
      if (&rs != &bs)
        fail (loc) << "bin.config module must be loaded in project root";

      // Load bin.vars.
      //
      load_module (rs, rs, "bin.vars", loc);

      // Configure.
      //
      using config::required;
      using config::optional;
      using config::omitted;

      // Adjust module priority (binutils).
      //
      config::save_module (rs, "bin", 350);

      // The idea here is as follows: if we already have one of
      // the bin.* variables set, then we assume this is static
      // project configuration and don't bother setting the
      // corresponding config.bin.* variable.
      //
      //@@ Need to validate the values. Would be more efficient
      //   to do it once on assignment than every time on query.
      //   Custom var type?
      //

      // config.bin.lib
      //
      {
        value& v (rs.assign ("bin.lib"));
        if (!v)
          v = *required (rs, "config.bin.lib", "both").first;
      }

      // config.bin.exe.lib
      //
      {
        value& v (rs.assign ("bin.exe.lib"));
        if (!v)
          v = *required (rs, "config.bin.exe.lib", exe_lib).first;
      }

      // config.bin.liba.lib
      //
      {
        value& v (rs.assign ("bin.liba.lib"));
        if (!v)
          v = *required (rs, "config.bin.liba.lib", liba_lib).first;
      }

      // config.bin.libs.lib
      //
      {
        value& v (rs.assign ("bin.libs.lib"));
        if (!v)
          v = *required (rs, "config.bin.libs.lib", libs_lib).first;
      }

      // config.bin.rpath[_link]
      //
      // These ones are optional and we merge them into bin.rpath[_link], if
      // any.
      //
      rs.assign ("bin.rpath") += cast_null<dir_paths> (
        optional (rs, "config.bin.rpath"));

      rs.assign ("bin.rpath_link") += cast_null<dir_paths> (
        optional (rs, "config.bin.rpath_link"));

      // config.bin.rpath[_link].auto
      //
      {
        lookup l;

        rs.assign ("bin.rpath.auto") =
          (l = omitted (rs, "config.bin.rpath.auto").first)
          ? cast<bool> (l)
          : true;

        rs.assign ("bin.rpath_link.auto") =
          (l = omitted (rs, "config.bin.rpath_link.auto").first)
          ? cast<bool> (l)
          : true;
      }

      // config.bin.{lib,exe}.{prefix,suffix}
      //
      // These ones are not used very often so we will omit them from the
      // config.build if not specified. We also override any existing value
      // that might have been specified before loading the module.
      //
      {
        lookup p (omitted (rs, "config.bin.prefix").first);
        lookup s (omitted (rs, "config.bin.suffix").first);

        auto set = [&rs] (const char* bv, const char* cv, lookup l)
        {
          if (lookup o = omitted (rs, cv).first)
            l = o;

          if (l)
            rs.assign (bv) = *l;
        };

        set ("bin.lib.prefix", "config.bin.lib.prefix", p);
        set ("bin.lib.suffix", "config.bin.lib.suffix", s);

        set ("bin.exe.prefix", "config.bin.exe.prefix", p);
        set ("bin.exe.suffix", "config.bin.exe.suffix", s);
      }

      if (first)
      {
        bool new_val (false); // Set any new values?

        // config.bin.target
        //
        {
          const variable& var (rs.ctx.var_pool["config.bin.target"]);

          // We first see if the value was specified via the configuration
          // mechanism.
          //
          auto p (omitted (rs, var));
          lookup l (p.first);

          // Then see if there is a config hint (e.g., from the cc module).
          //
          bool hint (false);
          if (!l)
          {
            if (auto hl = extra.hints[var])
            {
              l = hl;
              hint = true;
            }
          }

          if (!l)
            fail (loc) << "unable to determine binutils target" <<
              info << "consider specifying it with " << var <<
              info << "or first load a module that can provide it as a hint, "
                       << "such as c or cxx";

          // Split/canonicalize the target.
          //
          string s (cast<string> (l));

          // Did the user ask us to use config.sub? If this is a hinted value,
          // then we assume it has already been passed through config.sub.
          //
          if (!hint && config_sub)
          {
            s = run<string> (3,
                             *config_sub,
                             s.c_str (),
                             [] (string& l, bool) {return move (l);});
            l5 ([&]{trace << "config.sub target: '" << s << "'";});
          }

          try
          {
            target_triplet t (s);

            l5 ([&]{trace << "canonical target: '" << t.string () << "'; "
                          << "class: " << t.class_;});

            assert (!hint || s == t.string ());

            // Also enter as bin.target.{cpu,vendor,system,version,class}
            // for convenience of access.
            //
            rs.assign<string> ("bin.target.cpu")     = t.cpu;
            rs.assign<string> ("bin.target.vendor")  = t.vendor;
            rs.assign<string> ("bin.target.system")  = t.system;
            rs.assign<string> ("bin.target.version") = t.version;
            rs.assign<string> ("bin.target.class")   = t.class_;

            rs.assign<target_triplet> ("bin.target") = move (t);
          }
          catch (const invalid_argument& e)
          {
            // This is where we suggest that the user specifies --config-sub
            // to help us out.
            //
            fail << "unable to parse binutils target '" << s << "': " << e <<
              info << "consider using the --config-sub option";
          }

          new_val = new_val || p.second; // False for a hinted value.
        }

        // config.bin.pattern
        //
        {
          const variable& var (rs.ctx.var_pool["config.bin.pattern"]);

          // We first see if the value was specified via the configuration
          // mechanism.
          //
          auto p (omitted (rs, var));
          lookup l (p.first);

          // Then see if there is a config hint (e.g., from the C++ module).
          //
          if (!l)
          {
            if (auto hl = extra.hints[var])
              l = hl;
          }

          // For ease of use enter it as bin.pattern (since it can come from
          // different places).
          //
          if (l)
          {
            const string& s (cast<string> (l));

            if (s.empty () ||
                (!path::traits_type::is_separator (s.back ()) &&
                 s.find ('*') == string::npos))
            {
              fail << "missing '*' or trailing '"
                   << char (path::traits_type::directory_separator)
                   << "' in binutils pattern '" << s << "'";
            }

            rs.assign<string> ("bin.pattern") = s;
            new_val = new_val || p.second; // False for a hinted value.
          }
        }

        // If we set any new values (e.g., we are configuring), then print the
        // report at verbosity level 2 and up (-v).
        //
        if (verb >= (new_val ? 2 : 3))
        {
          diag_record dr (text);

          dr << "bin " << project (rs) << '@' << rs << '\n'
             << "  target     " << cast<target_triplet> (rs["bin.target"]);

          if (auto l = rs["bin.pattern"])
            dr << '\n'
               << "  pattern    " << cast<string> (l);
        }
      }

      return true;
    }

    bool
    init (scope& rs,
          scope& bs,
          const location& loc,
          bool first,
          bool,
          module_init_extra& extra)
    {
      tracer trace ("bin::init");
      l5 ([&]{trace << "for " << bs;});

      // Load bin.config.
      //
      load_module (rs, rs, "bin.config", loc, extra.hints);

      // Cache some config values we will be needing below.
      //
      const string& tclass (cast<string> (rs["bin.target.class"]));

      // Register target types and configure their default "installability".
      //
      bool install_loaded (cast_false<bool> (rs["install.loaded"]));
      {
        using namespace install;

        if (first)
        {
          rs.insert_target_type<obj>  ();
          rs.insert_target_type<obje> ();
          rs.insert_target_type<obja> ();
          rs.insert_target_type<objs> ();

          rs.insert_target_type<bmi>  ();
          rs.insert_target_type<bmie> ();
          rs.insert_target_type<bmia> ();
          rs.insert_target_type<bmis> ();

          rs.insert_target_type<hbmi>  ();
          rs.insert_target_type<hbmie> ();
          rs.insert_target_type<hbmia> ();
          rs.insert_target_type<hbmis> ();

          rs.insert_target_type<libul> ();
          rs.insert_target_type<libue> ();
          rs.insert_target_type<libua> ();
          rs.insert_target_type<libus> ();

          rs.insert_target_type<lib>  ();
          rs.insert_target_type<liba> ();
          rs.insert_target_type<libs> ();

          // Register the def{} target type. Note that we do it here since it
          // is input and can be specified unconditionally (i.e., not only
          // when building for Windows).
          //
          rs.insert_target_type<def> ();
        }

        // Note: libu*{} members are not installable.
        //
        if (install_loaded)
        {
          install_path<liba> (bs, dir_path ("lib")); // Install in install.lib.
          install_mode<liba> (bs, "644");
        }

        // Should shared libraries have the executable bit? That depends on
        // who you ask. In Debian, for example, it should not unless, it
        // really is executable (i.e., has main()). On the other hand, on
        // some systems, this may be required in order for the dynamic
        // linker to be able to load the library. So, by default, we will
        // keep it executable, especially seeing that this is also the
        // behavior of autotools. At the same time, it is easy to override
        // this, for example:
        //
        // config.install.lib.mode=644
        //
        // And a library that wants to override any such overrides (e.g.,
        // because it does have main()) can do:
        //
        // libs{foo}: install.mode=755
        //
        // Everyone is happy then? On Windows libs{} is the DLL and goes to
        // bin/, not lib/.
        //
        if (install_loaded)
          install_path<libs> (bs,
                              dir_path (tclass == "windows" ? "bin" : "lib"));

        // Create additional target types for certain targets.
        //
        if (tclass == "windows")
        {
          // Import library.
          //
          if (first)
            rs.insert_target_type<libi> ();

          if (install_loaded)
          {
            install_path<libi> (bs, dir_path ("lib"));
            install_mode<libi> (bs, "644");
          }
        }
      }

      // Register rules.
      //
      {
        auto& r (bs.rules);

        r.insert<obj> (perform_update_id, "bin.obj", fail_);
        r.insert<obj> (perform_clean_id,  "bin.obj", fail_);

        r.insert<bmi> (perform_update_id, "bin.bmi", fail_);
        r.insert<bmi> (perform_clean_id,  "bin.bmi", fail_);

        r.insert<hbmi> (perform_update_id, "bin.hbmi", fail_);
        r.insert<hbmi> (perform_clean_id,  "bin.hbmi", fail_);

        r.insert<libul> (perform_update_id, "bin.libul", fail_);
        r.insert<libul> (perform_clean_id,  "bin.libul", fail_);

        // Similar to alias.
        //

        //@@ outer
        r.insert<lib> (perform_id,   0, "bin.lib", lib_);
        r.insert<lib> (configure_id, 0, "bin.lib", lib_);

        // Treat as a see through group for install, test, and dist.
        //
        if (install_loaded)
        {
          auto& gr (install::group_rule::instance);

          r.insert<lib> (perform_install_id,   "bin.lib", gr);
          r.insert<lib> (perform_uninstall_id, "bin.lib", gr);
        }

        if (const test::module* m = rs.find_module<test::module> ("test"))
        {
          r.insert<lib> (perform_test_id, "bin.lib", m->group_rule ());
        }

        if (rs.find_module ("dist"))
        {
          r.insert<lib> (dist_id, 0, "bin.lib", lib_);
        }
      }

      return true;
    }

    bool
    ar_config_init (scope& rs,
                    scope& bs,
                    const location& loc,
                    bool first,
                    bool,
                    module_init_extra& extra)
    {
      tracer trace ("bin::ar_config_init");
      l5 ([&]{trace << "for " << bs;});

      // Make sure bin.config is loaded.
      //
      load_module (rs, bs, "bin.config", loc, extra.hints);

      // Enter configuration variables.
      //
      if (first)
      {
        auto& vp (rs.var_pool ());

        vp.insert<process_path> ("bin.ar.path");
        vp.insert<process_path> ("bin.ranlib.path");

        vp.insert<path>         ("config.bin.ar", true);
        vp.insert<path>         ("config.bin.ranlib", true);
      }

      // Configure.
      //
      if (first)
      {
        // config.bin.ar
        // config.bin.ranlib
        //
        // For config.bin.ar we have the default (plus the pattern) while
        // ranlib should be explicitly specified by the user in order for us
        // to use it (all targets that we currently care to support have the
        // ar -s option but if that changes we can always force the use of
        // ranlib for certain targets).
        //
        // Another idea is to refuse to use default 'ar' (without the pattern)
        // if the host/build targets don't match. On the other hand, a cross-
        // toolchain can be target-unprefixed. Also, without canonicalization,
        // comparing targets will be unreliable.
        //

        // Use the target to decide on the default binutils program names.
        //
        const string& tsys (cast<string> (rs["bin.target.system"]));
        const char* ar_d (tsys == "win32-msvc" ? "lib" : "ar");

        // This can be either a pattern or search path(s).
        //
        pattern_paths pat (lookup_pattern (rs));

        // Don't save the default value to config.build so that if the user
        // changes, say, the C++ compiler (which hinted the pattern), then
        // ar will automatically change as well.
        //
        auto ap (
          config::required (
            rs,
            "config.bin.ar",
            path (apply_pattern (ar_d, pat.pattern)),
            false,
            config::save_commented));

        auto rp (
          config::required (
            rs,
            "config.bin.ranlib",
            nullptr,
            false,
            config::save_commented));

        const path& ar (cast<path> (ap.first));
        const path* ranlib (cast_null<path> (rp.first));

        ar_info ari (guess_ar (ar, ranlib, pat.paths));

        // If this is a new value (e.g., we are configuring), then print the
        // report at verbosity level 2 and up (-v).
        //
        if (verb >= (ap.second || rp.second ? 2 : 3))
        {
          diag_record dr (text);

          {
            dr << "bin.ar " << project (rs) << '@' << rs << '\n'
               << "  ar         " << ari.ar_path << '\n'
               << "  id         " << ari.ar_id << '\n'
               << "  version    " << ari.ar_version.string () << '\n'
               << "  major      " << ari.ar_version.major << '\n'
               << "  minor      " << ari.ar_version.minor << '\n'
               << "  patch      " << ari.ar_version.patch << '\n';
          }

          if (!ari.ar_version.build.empty ())
          {
            dr << "  build      " << ari.ar_version.build << '\n';
          }

          {
            dr << "  signature  " << ari.ar_signature << '\n'
               << "  checksum   " << ari.ar_checksum;
          }

          if (ranlib != nullptr)
          {
            dr << '\n'
               << "  ranlib     " << ari.ranlib_path << '\n'
               << "  id         " << ari.ranlib_id << '\n'
               << "  signature  " << ari.ranlib_signature << '\n'
               << "  checksum   " << ari.ranlib_checksum;
          }
        }

        rs.assign<process_path> ("bin.ar.path")      = move (ari.ar_path);
        rs.assign<string>       ("bin.ar.id")        = move (ari.ar_id);
        rs.assign<string>       ("bin.ar.signature") = move (ari.ar_signature);
        rs.assign<string>       ("bin.ar.checksum")  = move (ari.ar_checksum);

        {
          semantic_version& v (ari.ar_version);

          rs.assign<string>   ("bin.ar.version")       = v.string ();
          rs.assign<uint64_t> ("bin.ar.version.major") = v.major;
          rs.assign<uint64_t> ("bin.ar.version.minor") = v.minor;
          rs.assign<uint64_t> ("bin.ar.version.patch") = v.patch;
          rs.assign<string>   ("bin.ar.version.build") = move (v.build);
        }

        if (ranlib != nullptr)
        {
          rs.assign<process_path> ("bin.ranlib.path") = move (ari.ranlib_path);
          rs.assign<string>       ("bin.ranlib.id")   = move (ari.ranlib_id);
          rs.assign<string>       ("bin.ranlib.signature") =
            move (ari.ranlib_signature);
          rs.assign<string>       ("bin.ranlib.checksum") =
            move (ari.ranlib_checksum);
        }
      }

      return true;
    }

    bool
    ar_init (scope& rs,
             scope& bs,
             const location& loc,
             bool,
             bool,
             module_init_extra& extra)
    {
      tracer trace ("bin::ar_init");
      l5 ([&]{trace << "for " << bs;});

      // Make sure the bin core and ar.config are loaded.
      //
      load_module (rs, bs, "bin",           loc, extra.hints);
      load_module (rs, bs, "bin.ar.config", loc, extra.hints);

      return true;
    }

    bool
    ld_config_init (scope& rs,
                    scope& bs,
                    const location& loc,
                    bool first,
                    bool,
                    module_init_extra& extra)
    {
      tracer trace ("bin::ld_config_init");
      l5 ([&]{trace << "for " << bs;});

      // Make sure bin.config is loaded.
      //
      load_module (rs, rs, "bin.config", loc, extra.hints);

      // Enter configuration variables.
      //
      if (first)
      {
        auto& vp (rs.var_pool ());

        vp.insert<process_path> ("bin.ld.path");
        vp.insert<path>         ("config.bin.ld", true);
      }

      // Configure.
      //
      if (first)
      {
        // config.bin.ld
        //
        // Use the target to decide on the default ld name.
        //
        const string& tsys (cast<string> (rs["bin.target.system"]));
        const char* ld_d (tsys == "win32-msvc" ? "link" : "ld");

        // This can be either a pattern or search path(s).
        //
        pattern_paths pat (lookup_pattern (rs));

        auto p (
          config::required (
            rs,
            "config.bin.ld",
            path (apply_pattern (ld_d, pat.pattern)),
            false,
            config::save_commented));

        const path& ld (cast<path> (p.first));
        ld_info ldi (guess_ld (ld, pat.paths));

        // If this is a new value (e.g., we are configuring), then print the
        // report at verbosity level 2 and up (-v).
        //
        if (verb >= (p.second ? 2 : 3))
        {
          text << "bin.ld " << project (rs) << '@' << rs << '\n'
               << "  ld         " << ldi.path << '\n'
               << "  id         " << ldi.id << '\n'
               << "  signature  " << ldi.signature << '\n'
               << "  checksum   " << ldi.checksum;
        }

        rs.assign<process_path> ("bin.ld.path")      = move (ldi.path);
        rs.assign<string>       ("bin.ld.id")        = move (ldi.id);
        rs.assign<string>       ("bin.ld.signature") = move (ldi.signature);
        rs.assign<string>       ("bin.ld.checksum")  = move (ldi.checksum);
      }

      return true;
    }

    bool
    ld_init (scope& rs,
             scope& bs,
             const location& loc,
             bool,
             bool,
             module_init_extra& extra)
    {
      tracer trace ("bin::ld_init");
      l5 ([&]{trace << "for " << bs;});

      // Make sure the bin core and ld.config are loaded.
      //
      load_module (rs, bs, "bin",           loc, extra.hints);
      load_module (rs, bs, "bin.ld.config", loc, extra.hints);

      const string& lid (cast<string> (rs["bin.ld.id"]));

      // Register the pdb{} target if using the VC toolchain.
      //
      using namespace install;

      if (lid == "msvc")
      {
        const target_type& pdb (bs.derive_target_type<file> ("pdb").first);
        install_path (bs, pdb, dir_path ("bin")); // Goes to install.bin
        install_mode (bs, pdb, "644");            // But not executable.
      }

      return true;
    }

    bool
    rc_config_init (scope& rs,
                    scope& bs,
                    const location& loc,
                    bool first,
                    bool,
                    module_init_extra& extra)
    {
      tracer trace ("bin::rc_config_init");
      l5 ([&]{trace << "for " << bs;});

      // Make sure bin.config is loaded.
      //
      load_module (rs, bs, "bin.config", loc, extra.hints);

      // Enter configuration variables.
      //
      if (first)
      {
        auto& vp (rs.var_pool ());

        vp.insert<process_path> ("bin.rc.path");
        vp.insert<path>         ("config.bin.rc", true);
      }

      // Configure.
      //
      if (first)
      {
        // config.bin.rc
        //
        // Use the target to decide on the default rc name.
        //
        const string& tsys (cast<string> (rs["bin.target.system"]));
        const char* rc_d (tsys == "win32-msvc" ? "rc" : "windres");

        // This can be either a pattern or search path(s).
        //
        pattern_paths pat (lookup_pattern (rs));

        auto p (
          config::required (
            rs,
            "config.bin.rc",
            path (apply_pattern (rc_d, pat.pattern)),
            false,
            config::save_commented));

        const path& rc (cast<path> (p.first));
        rc_info rci (guess_rc (rc, pat.paths));

        // If this is a new value (e.g., we are configuring), then print the
        // report at verbosity level 2 and up (-v).
        //
        if (verb >= (p.second ? 2 : 3))
        {
          text << "bin.rc " << project (rs) << '@' << rs << '\n'
               << "  rc         " << rci.path << '\n'
               << "  id         " << rci.id << '\n'
               << "  signature  " << rci.signature << '\n'
               << "  checksum   " << rci.checksum;
        }

        rs.assign<process_path> ("bin.rc.path")      = move (rci.path);
        rs.assign<string>       ("bin.rc.id")        = move (rci.id);
        rs.assign<string>       ("bin.rc.signature") = move (rci.signature);
        rs.assign<string>       ("bin.rc.checksum")  = move (rci.checksum);
      }

      return true;
    }

    bool
    rc_init (scope& rs,
             scope& bs,
             const location& loc,
             bool,
             bool,
             module_init_extra& extra)
    {
      tracer trace ("bin::rc_init");
      l5 ([&]{trace << "for " << bs;});

      // Make sure the bin core and rc.config are loaded.
      //
      load_module (rs, bs, "bin",           loc, extra.hints);
      load_module (rs, bs, "bin.rc.config", loc, extra.hints);

      return true;
    }

    static const module_functions mod_functions[] =
    {
      // NOTE: don't forget to also update the documentation in init.hxx if
      //       changing anything here.

      {"bin.vars",      nullptr, vars_init},
      {"bin.config",    nullptr, config_init},
      {"bin",           nullptr, init},
      {"bin.ar.config", nullptr, ar_config_init},
      {"bin.ar",        nullptr, ar_init},
      {"bin.ld.config", nullptr, ld_config_init},
      {"bin.ld",        nullptr, ld_init},
      {"bin.rc.config", nullptr, rc_config_init},
      {"bin.rc",        nullptr, rc_init},
      {nullptr,         nullptr, nullptr}
    };

    const module_functions*
    build2_bin_load ()
    {
      return mod_functions;
    }
  }
}