summaryrefslogtreecommitdiff
path: root/Modules/GetPrerequisites.cmake
blob: 8f2754ed9554e89f774fffd509006e75d78b69c0 (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
# - Functions to analyze and list executable file prerequisites.
# This module provides functions to list the .dll, .dylib or .so
# files that an executable or shared library file depends on. (Its
# prerequisites.)
#
# It uses various tools to obtain the list of required shared library files:
#   dumpbin (Windows)
#   ldd (Linux/Unix)
#   otool (Mac OSX)
# The following functions are provided by this module:
#   get_prerequisites
#   list_prerequisites
#   list_prerequisites_by_glob
#   gp_append_unique
#   is_file_executable
#   gp_item_default_embedded_path
#     (projects can override with gp_item_default_embedded_path_override)
#   gp_resolve_item
#     (projects can override with gp_resolve_item_override)
#   gp_resolved_file_type
#     (projects can override with gp_resolved_file_type_override)
#   gp_file_type
# Requires CMake 2.6 or greater because it uses function, break, return and
# PARENT_SCOPE.
#
#  GET_PREREQUISITES(<target> <prerequisites_var> <exclude_system> <recurse>
#                    <exepath> <dirs>)
# Get the list of shared library files required by <target>. The list in
# the variable named <prerequisites_var> should be empty on first entry to
# this function. On exit, <prerequisites_var> will contain the list of
# required shared library files.
#
# <target> is the full path to an executable file. <prerequisites_var> is the
# name of a CMake variable to contain the results. <exclude_system> must be 0
# or 1 indicating whether to include or exclude "system" prerequisites. If
# <recurse> is set to 1 all prerequisites will be found recursively, if set to
# 0 only direct prerequisites are listed. <exepath> is the path to the top
# level executable used for @executable_path replacment on the Mac. <dirs> is
# a list of paths where libraries might be found: these paths are searched
# first when a target without any path info is given. Then standard system
# locations are also searched: PATH, Framework locations, /usr/lib...
#
#  LIST_PREREQUISITES(<target> [<recurse> [<exclude_system> [<verbose>]]])
# Print a message listing the prerequisites of <target>.
#
# <target> is the name of a shared library or executable target or the full
# path to a shared library or executable file. If <recurse> is set to 1 all
# prerequisites will be found recursively, if set to 0 only direct
# prerequisites are listed. <exclude_system> must be 0 or 1 indicating whether
# to include or exclude "system" prerequisites. With <verbose> set to 0 only
# the full path names of the prerequisites are printed, set to 1 extra
# informatin will be displayed.
#
#  LIST_PREREQUISITES_BY_GLOB(<glob_arg> <glob_exp>)
# Print the prerequisites of shared library and executable files matching a
# globbing pattern. <glob_arg> is GLOB or GLOB_RECURSE and <glob_exp> is a
# globbing expression used with "file(GLOB" or "file(GLOB_RECURSE" to retrieve
# a list of matching files. If a matching file is executable, its prerequisites
# are listed.
#
# Any additional (optional) arguments provided are passed along as the
# optional arguments to the list_prerequisites calls.
#
#  GP_APPEND_UNIQUE(<list_var> <value>)
# Append <value> to the list variable <list_var> only if the value is not
# already in the list.
#
#  IS_FILE_EXECUTABLE(<file> <result_var>)
# Return 1 in <result_var> if <file> is a binary executable, 0 otherwise.
#
#  GP_ITEM_DEFAULT_EMBEDDED_PATH(<item> <default_embedded_path_var>)
# Return the path that others should refer to the item by when the item
# is embedded inside a bundle.
#
# Override on a per-project basis by providing a project-specific
# gp_item_default_embedded_path_override function.
#
#  GP_RESOLVE_ITEM(<context> <item> <exepath> <dirs> <resolved_item_var>)
# Resolve an item into an existing full path file.
#
# Override on a per-project basis by providing a project-specific
# gp_resolve_item_override function.
#
#  GP_RESOLVED_FILE_TYPE(<original_file> <file> <exepath> <dirs> <type_var>)
# Return the type of <file> with respect to <original_file>. String
# describing type of prerequisite is returned in variable named <type_var>.
#
# Use <exepath> and <dirs> if necessary to resolve non-absolute <file>
# values -- but only for non-embedded items.
#
# Possible types are:
#   system
#   local
#   embedded
#   other
# Override on a per-project basis by providing a project-specific
# gp_resolved_file_type_override function.
#
#  GP_FILE_TYPE(<original_file> <file> <type_var>)
# Return the type of <file> with respect to <original_file>. String
# describing type of prerequisite is returned in variable named <type_var>.
#
# Possible types are:
#   system
#   local
#   embedded
#   other

#=============================================================================
# Copyright 2008-2009 Kitware, Inc.
#
# Distributed under the OSI-approved BSD License (the "License");
# see accompanying file Copyright.txt for details.
#
# This software is distributed WITHOUT ANY WARRANTY; without even the
# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
# See the License for more information.
#=============================================================================
# (To distribute this file outside of CMake, substitute the full
#  License text for the above reference.)

function(gp_append_unique list_var value)
  set(contains 0)

  foreach(item ${${list_var}})
    if("${item}" STREQUAL "${value}")
      set(contains 1)
      break()
    endif()
  endforeach()

  if(NOT contains)
    set(${list_var} ${${list_var}} "${value}" PARENT_SCOPE)
  endif()
endfunction()


function(is_file_executable file result_var)
  #
  # A file is not executable until proven otherwise:
  #
  set(${result_var} 0 PARENT_SCOPE)

  get_filename_component(file_full "${file}" ABSOLUTE)
  string(TOLOWER "${file_full}" file_full_lower)

  # If file name ends in .exe on Windows, *assume* executable:
  #
  if(WIN32 AND NOT UNIX)
    if("${file_full_lower}" MATCHES "\\.exe$")
      set(${result_var} 1 PARENT_SCOPE)
      return()
    endif()

    # A clause could be added here that uses output or return value of dumpbin
    # to determine ${result_var}. In 99%+? practical cases, the exe name
    # match will be sufficient...
    #
  endif()

  # Use the information returned from the Unix shell command "file" to
  # determine if ${file_full} should be considered an executable file...
  #
  # If the file command's output contains "executable" and does *not* contain
  # "text" then it is likely an executable suitable for prerequisite analysis
  # via the get_prerequisites macro.
  #
  if(UNIX)
    if(NOT file_cmd)
      find_program(file_cmd "file")
      mark_as_advanced(file_cmd)
    endif()

    if(file_cmd)
      execute_process(COMMAND "${file_cmd}" "${file_full}"
        OUTPUT_VARIABLE file_ov
        OUTPUT_STRIP_TRAILING_WHITESPACE
        )

      # Replace the name of the file in the output with a placeholder token
      # (the string " _file_full_ ") so that just in case the path name of
      # the file contains the word "text" or "executable" we are not fooled
      # into thinking "the wrong thing" because the file name matches the
      # other 'file' command output we are looking for...
      #
      string(REPLACE "${file_full}" " _file_full_ " file_ov "${file_ov}")
      string(TOLOWER "${file_ov}" file_ov)

      #message(STATUS "file_ov='${file_ov}'")
      if("${file_ov}" MATCHES "executable")
        #message(STATUS "executable!")
        if("${file_ov}" MATCHES "text")
          #message(STATUS "but text, so *not* a binary executable!")
        else()
          set(${result_var} 1 PARENT_SCOPE)
          return()
        endif()
      endif()

      # Also detect position independent executables on Linux,
      # where "file" gives "shared object ... (uses shared libraries)"
      if("${file_ov}" MATCHES "shared object.*\(uses shared libs\)")
        set(${result_var} 1 PARENT_SCOPE)
        return()
      endif()

    else()
      message(STATUS "warning: No 'file' command, skipping execute_process...")
    endif()
  endif()
endfunction()


function(gp_item_default_embedded_path item default_embedded_path_var)

  # On Windows and Linux, "embed" prerequisites in the same directory
  # as the executable by default:
  #
  set(path "@executable_path")
  set(overridden 0)

  # On the Mac, relative to the executable depending on the type
  # of the thing we are embedding:
  #
  if(APPLE)
    #
    # The assumption here is that all executables in the bundle will be
    # in same-level-directories inside the bundle. The parent directory
    # of an executable inside the bundle should be MacOS or a sibling of
    # MacOS and all embedded paths returned from here will begin with
    # "@executable_path/../" and will work from all executables in all
    # such same-level-directories inside the bundle.
    #

    # By default, embed things right next to the main bundle executable:
    #
    set(path "@executable_path/../../Contents/MacOS")

    # Embed .dylibs right next to the main bundle executable:
    #
    if(item MATCHES "\\.dylib$")
      set(path "@executable_path/../MacOS")
      set(overridden 1)
    endif()

    # Embed frameworks in the embedded "Frameworks" directory (sibling of MacOS):
    #
    if(NOT overridden)
      if(item MATCHES "[^/]+\\.framework/")
        set(path "@executable_path/../Frameworks")
        set(overridden 1)
      endif()
    endif()
  endif()

  # Provide a hook so that projects can override the default embedded location
  # of any given library by whatever logic they choose:
  #
  if(COMMAND gp_item_default_embedded_path_override)
    gp_item_default_embedded_path_override("${item}" path)
  endif()

  set(${default_embedded_path_var} "${path}" PARENT_SCOPE)
endfunction()


function(gp_resolve_item context item exepath dirs resolved_item_var)
  set(resolved 0)
  set(resolved_item "${item}")

  # Is it already resolved?
  #
  if(IS_ABSOLUTE "${resolved_item}" AND EXISTS "${resolved_item}")
    set(resolved 1)
  endif()

  if(NOT resolved)
    if(item MATCHES "@executable_path")
      #
      # @executable_path references are assumed relative to exepath
      #
      string(REPLACE "@executable_path" "${exepath}" ri "${item}")
      get_filename_component(ri "${ri}" ABSOLUTE)

      if(EXISTS "${ri}")
        #message(STATUS "info: embedded item exists (${ri})")
        set(resolved 1)
        set(resolved_item "${ri}")
      else()
        message(STATUS "warning: embedded item does not exist '${ri}'")
      endif()
    endif()
  endif()

  if(NOT resolved)
    if(item MATCHES "@loader_path")
      #
      # @loader_path references are assumed relative to the
      # PATH of the given "context" (presumably another library)
      #
      get_filename_component(contextpath "${context}" PATH)
      string(REPLACE "@loader_path" "${contextpath}" ri "${item}")
      get_filename_component(ri "${ri}" ABSOLUTE)

      if(EXISTS "${ri}")
        #message(STATUS "info: embedded item exists (${ri})")
        set(resolved 1)
        set(resolved_item "${ri}")
      else()
        message(STATUS "warning: embedded item does not exist '${ri}'")
      endif()
    endif()
  endif()

  if(NOT resolved)
    if(item MATCHES "@rpath")
      #
      # @rpath references are relative to the paths built into the binaries with -rpath
      # We handle this case like we do for other Unixes
      #
      string(REPLACE "@rpath/" "" norpath_item "${item}")

      set(ri "ri-NOTFOUND")
      find_file(ri "${norpath_item}" ${exepath} ${dirs} NO_DEFAULT_PATH)
      if(ri)
        #message(STATUS "info: 'find_file' in exepath/dirs (${ri})")
        set(resolved 1)
        set(resolved_item "${ri}")
        set(ri "ri-NOTFOUND")
      endif()

    endif()
  endif()

  if(NOT resolved)
    set(ri "ri-NOTFOUND")
    find_file(ri "${item}" ${exepath} ${dirs} NO_DEFAULT_PATH)
    find_file(ri "${item}" ${exepath} ${dirs} /usr/lib)
    if(ri)
      #message(STATUS "info: 'find_file' in exepath/dirs (${ri})")
      set(resolved 1)
      set(resolved_item "${ri}")
      set(ri "ri-NOTFOUND")
    endif()
  endif()

  if(NOT resolved)
    if(item MATCHES "[^/]+\\.framework/")
      set(fw "fw-NOTFOUND")
      find_file(fw "${item}"
        "~/Library/Frameworks"
        "/Library/Frameworks"
        "/System/Library/Frameworks"
      )
      if(fw)
        #message(STATUS "info: 'find_file' found framework (${fw})")
        set(resolved 1)
        set(resolved_item "${fw}")
        set(fw "fw-NOTFOUND")
      endif()
    endif()
  endif()

  # Using find_program on Windows will find dll files that are in the PATH.
  # (Converting simple file names into full path names if found.)
  #
  if(WIN32 AND NOT UNIX)
  if(NOT resolved)
    set(ri "ri-NOTFOUND")
    find_program(ri "${item}" PATHS "${exepath};${dirs}" NO_DEFAULT_PATH)
    find_program(ri "${item}" PATHS "${exepath};${dirs}")
    if(ri)
      #message(STATUS "info: 'find_program' in exepath/dirs (${ri})")
      set(resolved 1)
      set(resolved_item "${ri}")
      set(ri "ri-NOTFOUND")
    endif()
  endif()
  endif()

  # Provide a hook so that projects can override item resolution
  # by whatever logic they choose:
  #
  if(COMMAND gp_resolve_item_override)
    gp_resolve_item_override("${context}" "${item}" "${exepath}" "${dirs}" resolved_item resolved)
  endif()

  if(NOT resolved)
    message(STATUS "
warning: cannot resolve item '${item}'

  possible problems:
    need more directories?
    need to use InstallRequiredSystemLibraries?
    run in install tree instead of build tree?
")
#    message(STATUS "
#******************************************************************************
#warning: cannot resolve item '${item}'
#
#  possible problems:
#    need more directories?
#    need to use InstallRequiredSystemLibraries?
#    run in install tree instead of build tree?
#
#    context='${context}'
#    item='${item}'
#    exepath='${exepath}'
#    dirs='${dirs}'
#    resolved_item_var='${resolved_item_var}'
#******************************************************************************
#")
  endif()

  set(${resolved_item_var} "${resolved_item}" PARENT_SCOPE)
endfunction()


function(gp_resolved_file_type original_file file exepath dirs type_var)
  #message(STATUS "**")

  if(NOT IS_ABSOLUTE "${original_file}")
    message(STATUS "warning: gp_resolved_file_type expects absolute full path for first arg original_file")
  endif()

  set(is_embedded 0)
  set(is_local 0)
  set(is_system 0)

  set(resolved_file "${file}")

  if("${file}" MATCHES "^@(executable|loader)_path")
    set(is_embedded 1)
  endif()

  if(NOT is_embedded)
    if(NOT IS_ABSOLUTE "${file}")
      gp_resolve_item("${original_file}" "${file}" "${exepath}" "${dirs}" resolved_file)
    endif()

    string(TOLOWER "${original_file}" original_lower)
    string(TOLOWER "${resolved_file}" lower)

    if(UNIX)
      if(resolved_file MATCHES "^(/lib/|/lib32/|/lib64/|/usr/lib/|/usr/lib32/|/usr/lib64/|/usr/X11R6/|/usr/bin/)")
        set(is_system 1)
      endif()
    endif()

    if(APPLE)
      if(resolved_file MATCHES "^(/System/Library/|/usr/lib/)")
        set(is_system 1)
      endif()
    endif()

    if(WIN32)
      string(TOLOWER "$ENV{SystemRoot}" sysroot)
      string(REGEX REPLACE "\\\\" "/" sysroot "${sysroot}")

      string(TOLOWER "$ENV{windir}" windir)
      string(REGEX REPLACE "\\\\" "/" windir "${windir}")

      if(lower MATCHES "^(${sysroot}/sys(tem|wow)|${windir}/sys(tem|wow)|(.*/)*msvc[^/]+dll)")
        set(is_system 1)
      endif()

      if(UNIX)
        # if cygwin, we can get the properly formed windows paths from cygpath
        find_program(CYGPATH_EXECUTABLE cygpath)

        if(CYGPATH_EXECUTABLE)
          execute_process(COMMAND ${CYGPATH_EXECUTABLE} -W
                          OUTPUT_VARIABLE env_windir
                          OUTPUT_STRIP_TRAILING_WHITESPACE)
          execute_process(COMMAND ${CYGPATH_EXECUTABLE} -S
                          OUTPUT_VARIABLE env_sysdir
                          OUTPUT_STRIP_TRAILING_WHITESPACE)
          string(TOLOWER "${env_windir}" windir)
          string(TOLOWER "${env_sysdir}" sysroot)

          if(lower MATCHES "^(${sysroot}/sys(tem|wow)|${windir}/sys(tem|wow)|(.*/)*msvc[^/]+dll)")
            set(is_system 1)
          endif()
        endif()
      endif()
    endif()

    if(NOT is_system)
      get_filename_component(original_path "${original_lower}" PATH)
      get_filename_component(path "${lower}" PATH)
      if("${original_path}" STREQUAL "${path}")
        set(is_local 1)
      else()
        string(LENGTH "${original_path}/" original_length)
        string(LENGTH "${lower}" path_length)
        if(${path_length} GREATER ${original_length})
          string(SUBSTRING "${lower}" 0 ${original_length} path)
          if("${original_path}/" STREQUAL "${path}")
            set(is_embedded 1)
          endif()
        endif()
      endif()
    endif()
  endif()

  # Return type string based on computed booleans:
  #
  set(type "other")

  if(is_system)
    set(type "system")
  elseif(is_embedded)
    set(type "embedded")
  elseif(is_local)
    set(type "local")
  endif()

  #message(STATUS "gp_resolved_file_type: '${file}' '${resolved_file}'")
  #message(STATUS "                type: '${type}'")

  if(NOT is_embedded)
    if(NOT IS_ABSOLUTE "${resolved_file}")
      if(lower MATCHES "^msvc[^/]+dll" AND is_system)
        message(STATUS "info: non-absolute msvc file '${file}' returning type '${type}'")
      else()
        message(STATUS "warning: gp_resolved_file_type non-absolute file '${file}' returning type '${type}' -- possibly incorrect")
      endif()
    endif()
  endif()

  # Provide a hook so that projects can override the decision on whether a
  # library belongs to the system or not by whatever logic they choose:
  #
  if(COMMAND gp_resolved_file_type_override)
    gp_resolved_file_type_override("${resolved_file}" type)
  endif()

  set(${type_var} "${type}" PARENT_SCOPE)

  #message(STATUS "**")
endfunction()


function(gp_file_type original_file file type_var)
  if(NOT IS_ABSOLUTE "${original_file}")
    message(STATUS "warning: gp_file_type expects absolute full path for first arg original_file")
  endif()

  get_filename_component(exepath "${original_file}" PATH)

  set(type "")
  gp_resolved_file_type("${original_file}" "${file}" "${exepath}" "" type)

  set(${type_var} "${type}" PARENT_SCOPE)
endfunction()


function(get_prerequisites target prerequisites_var exclude_system recurse exepath dirs)
  set(verbose 0)
  set(eol_char "E")

  if(NOT IS_ABSOLUTE "${target}")
    message("warning: target '${target}' is not absolute...")
  endif()

  if(NOT EXISTS "${target}")
    message("warning: target '${target}' does not exist...")
  endif()

  # <setup-gp_tool-vars>
  #
  # Try to choose the right tool by default. Caller can set gp_tool prior to
  # calling this function to force using a different tool.
  #
  if("${gp_tool}" STREQUAL "")
    set(gp_tool "ldd")
    if(APPLE)
      set(gp_tool "otool")
    endif()
    if(WIN32 AND NOT UNIX) # This is how to check for cygwin, har!
      set(gp_tool "dumpbin")
    endif()
  endif()

  set(gp_tool_known 0)

  if("${gp_tool}" STREQUAL "ldd")
    set(gp_cmd_args "")
    set(gp_regex "^[\t ]*[^\t ]+ => ([^\t\(]+) .*${eol_char}$")
    set(gp_regex_error "not found${eol_char}$")
    set(gp_regex_fallback "^[\t ]*([^\t ]+) => ([^\t ]+).*${eol_char}$")
    set(gp_regex_cmp_count 1)
    set(gp_tool_known 1)
  endif()

  if("${gp_tool}" STREQUAL "otool")
    set(gp_cmd_args "-L")
    set(gp_regex "^\t([^\t]+) \\(compatibility version ([0-9]+.[0-9]+.[0-9]+), current version ([0-9]+.[0-9]+.[0-9]+)\\)${eol_char}$")
    set(gp_regex_error "")
    set(gp_regex_fallback "")
    set(gp_regex_cmp_count 3)
    set(gp_tool_known 1)
  endif()

  if("${gp_tool}" STREQUAL "dumpbin")
    set(gp_cmd_args "/dependents")
    set(gp_regex "^    ([^ ].*[Dd][Ll][Ll])${eol_char}$")
    set(gp_regex_error "")
    set(gp_regex_fallback "")
    set(gp_regex_cmp_count 1)
    set(gp_tool_known 1)
    set(ENV{VS_UNICODE_OUTPUT} "") # Block extra output from inside VS IDE.
  endif()

  if(NOT gp_tool_known)
    message(STATUS "warning: gp_tool='${gp_tool}' is an unknown tool...")
    message(STATUS "CMake function get_prerequisites needs more code to handle '${gp_tool}'")
    message(STATUS "Valid gp_tool values are dumpbin, ldd and otool.")
    return()
  endif()

  set(gp_cmd_paths ${gp_cmd_paths}
    "C:/Program Files/Microsoft Visual Studio 9.0/VC/bin"
    "C:/Program Files (x86)/Microsoft Visual Studio 9.0/VC/bin"
    "C:/Program Files/Microsoft Visual Studio 8/VC/BIN"
    "C:/Program Files (x86)/Microsoft Visual Studio 8/VC/BIN"
    "C:/Program Files/Microsoft Visual Studio .NET 2003/VC7/BIN"
    "C:/Program Files (x86)/Microsoft Visual Studio .NET 2003/VC7/BIN"
    "/usr/local/bin"
    "/usr/bin"
    )

  find_program(gp_cmd ${gp_tool} PATHS ${gp_cmd_paths})

  if(NOT gp_cmd)
    message(STATUS "warning: could not find '${gp_tool}' - cannot analyze prerequisites...")
    return()
  endif()

  if("${gp_tool}" STREQUAL "dumpbin")
    # When running dumpbin, it also needs the "Common7/IDE" directory in the
    # PATH. It will already be in the PATH if being run from a Visual Studio
    # command prompt. Add it to the PATH here in case we are running from a
    # different command prompt.
    #
    get_filename_component(gp_cmd_dir "${gp_cmd}" PATH)
    get_filename_component(gp_cmd_dlls_dir "${gp_cmd_dir}/../../Common7/IDE" ABSOLUTE)
    # Use cmake paths as a user may have a PATH element ending with a backslash.
    # This will escape the list delimiter and create havoc!
    if(EXISTS "${gp_cmd_dlls_dir}")
      # only add to the path if it is not already in the path
      set(gp_found_cmd_dlls_dir 0)
      file(TO_CMAKE_PATH "$ENV{PATH}" env_path)
      foreach(gp_env_path_element ${env_path})
        if("${gp_env_path_element}" STREQUAL "${gp_cmd_dlls_dir}")
          set(gp_found_cmd_dlls_dir 1)
        endif()
      endforeach()

      if(NOT gp_found_cmd_dlls_dir)
        file(TO_NATIVE_PATH "${gp_cmd_dlls_dir}" gp_cmd_dlls_dir)
        set(ENV{PATH} "$ENV{PATH};${gp_cmd_dlls_dir}")
      endif()
    endif()
  endif()
  #
  # </setup-gp_tool-vars>

  if("${gp_tool}" STREQUAL "ldd")
    set(old_ld_env "$ENV{LD_LIBRARY_PATH}")
    foreach(dir ${exepath} ${dirs})
      set(ENV{LD_LIBRARY_PATH} "${dir}:$ENV{LD_LIBRARY_PATH}")
    endforeach()
  endif()


  # Track new prerequisites at each new level of recursion. Start with an
  # empty list at each level:
  #
  set(unseen_prereqs)

  # Run gp_cmd on the target:
  #
  execute_process(
    COMMAND ${gp_cmd} ${gp_cmd_args} ${target}
    OUTPUT_VARIABLE gp_cmd_ov
    )

  if("${gp_tool}" STREQUAL "ldd")
    set(ENV{LD_LIBRARY_PATH} "${old_ld_env}")
  endif()

  if(verbose)
    message(STATUS "<RawOutput cmd='${gp_cmd} ${gp_cmd_args} ${target}'>")
    message(STATUS "gp_cmd_ov='${gp_cmd_ov}'")
    message(STATUS "</RawOutput>")
  endif()

  get_filename_component(target_dir "${target}" PATH)

  # Convert to a list of lines:
  #
  string(REGEX REPLACE ";" "\\\\;" candidates "${gp_cmd_ov}")
  string(REGEX REPLACE "\n" "${eol_char};" candidates "${candidates}")

  # check for install id and remove it from list, since otool -L can include a
  # reference to itself
  set(gp_install_id)
  if("${gp_tool}" STREQUAL "otool")
    execute_process(
      COMMAND otool -D ${target}
      OUTPUT_VARIABLE gp_install_id_ov
      )
    # second line is install name
    string(REGEX REPLACE ".*:\n" "" gp_install_id "${gp_install_id_ov}")
    if(gp_install_id)
      # trim
      string(REGEX MATCH "[^\n ].*[^\n ]" gp_install_id "${gp_install_id}")
      #message("INSTALL ID is \"${gp_install_id}\"")
    endif()
  endif()

  # Analyze each line for file names that match the regular expression:
  #
  foreach(candidate ${candidates})
  if("${candidate}" MATCHES "${gp_regex}")

    # Extract information from each candidate:
    if(gp_regex_error AND "${candidate}" MATCHES "${gp_regex_error}")
      string(REGEX REPLACE "${gp_regex_fallback}" "\\1" raw_item "${candidate}")
    else()
      string(REGEX REPLACE "${gp_regex}" "\\1" raw_item "${candidate}")
    endif()

    if(gp_regex_cmp_count GREATER 1)
      string(REGEX REPLACE "${gp_regex}" "\\2" raw_compat_version "${candidate}")
      string(REGEX REPLACE "^([0-9]+)\\.([0-9]+)\\.([0-9]+)$" "\\1" compat_major_version "${raw_compat_version}")
      string(REGEX REPLACE "^([0-9]+)\\.([0-9]+)\\.([0-9]+)$" "\\2" compat_minor_version "${raw_compat_version}")
      string(REGEX REPLACE "^([0-9]+)\\.([0-9]+)\\.([0-9]+)$" "\\3" compat_patch_version "${raw_compat_version}")
    endif()

    if(gp_regex_cmp_count GREATER 2)
      string(REGEX REPLACE "${gp_regex}" "\\3" raw_current_version "${candidate}")
      string(REGEX REPLACE "^([0-9]+)\\.([0-9]+)\\.([0-9]+)$" "\\1" current_major_version "${raw_current_version}")
      string(REGEX REPLACE "^([0-9]+)\\.([0-9]+)\\.([0-9]+)$" "\\2" current_minor_version "${raw_current_version}")
      string(REGEX REPLACE "^([0-9]+)\\.([0-9]+)\\.([0-9]+)$" "\\3" current_patch_version "${raw_current_version}")
    endif()

    # Use the raw_item as the list entries returned by this function. Use the
    # gp_resolve_item function to resolve it to an actual full path file if
    # necessary.
    #
    set(item "${raw_item}")

    # Add each item unless it is excluded:
    #
    set(add_item 1)

    if("${item}" STREQUAL "${gp_install_id}")
      set(add_item 0)
    endif()

    if(add_item AND ${exclude_system})
      set(type "")
      gp_resolved_file_type("${target}" "${item}" "${exepath}" "${dirs}" type)

      if("${type}" STREQUAL "system")
        set(add_item 0)
      endif()
    endif()

    if(add_item)
      list(LENGTH ${prerequisites_var} list_length_before_append)
      gp_append_unique(${prerequisites_var} "${item}")
      list(LENGTH ${prerequisites_var} list_length_after_append)

      if(${recurse})
        # If item was really added, this is the first time we have seen it.
        # Add it to unseen_prereqs so that we can recursively add *its*
        # prerequisites...
        #
        # But first: resolve its name to an absolute full path name such
        # that the analysis tools can simply accept it as input.
        #
        if(NOT list_length_before_append EQUAL list_length_after_append)
          gp_resolve_item("${target}" "${item}" "${exepath}" "${dirs}" resolved_item)
          set(unseen_prereqs ${unseen_prereqs} "${resolved_item}")
        endif()
      endif()
    endif()
  else()
    if(verbose)
      message(STATUS "ignoring non-matching line: '${candidate}'")
    endif()
  endif()
  endforeach()

  list(LENGTH ${prerequisites_var} prerequisites_var_length)
  if(prerequisites_var_length GREATER 0)
    list(SORT ${prerequisites_var})
  endif()
  if(${recurse})
    set(more_inputs ${unseen_prereqs})
    foreach(input ${more_inputs})
      get_prerequisites("${input}" ${prerequisites_var} ${exclude_system} ${recurse} "${exepath}" "${dirs}")
    endforeach()
  endif()

  set(${prerequisites_var} ${${prerequisites_var}} PARENT_SCOPE)
endfunction()


function(list_prerequisites target)
  if("${ARGV1}" STREQUAL "")
    set(all 1)
  else()
    set(all "${ARGV1}")
  endif()

  if("${ARGV2}" STREQUAL "")
    set(exclude_system 0)
  else()
    set(exclude_system "${ARGV2}")
  endif()

  if("${ARGV3}" STREQUAL "")
    set(verbose 0)
  else()
    set(verbose "${ARGV3}")
  endif()

  set(count 0)
  set(count_str "")
  set(print_count "${verbose}")
  set(print_prerequisite_type "${verbose}")
  set(print_target "${verbose}")
  set(type_str "")

  get_filename_component(exepath "${target}" PATH)

  set(prereqs "")
  get_prerequisites("${target}" prereqs ${exclude_system} ${all} "${exepath}" "")

  if(print_target)
    message(STATUS "File '${target}' depends on:")
  endif()

  foreach(d ${prereqs})
    math(EXPR count "${count} + 1")

    if(print_count)
      set(count_str "${count}. ")
    endif()

    if(print_prerequisite_type)
      gp_file_type("${target}" "${d}" type)
      set(type_str " (${type})")
    endif()

    message(STATUS "${count_str}${d}${type_str}")
  endforeach()
endfunction()


function(list_prerequisites_by_glob glob_arg glob_exp)
  message(STATUS "=============================================================================")
  message(STATUS "List prerequisites of executables matching ${glob_arg} '${glob_exp}'")
  message(STATUS "")
  file(${glob_arg} file_list ${glob_exp})
  foreach(f ${file_list})
    is_file_executable("${f}" is_f_executable)
    if(is_f_executable)
      message(STATUS "=============================================================================")
      list_prerequisites("${f}" ${ARGN})
      message(STATUS "")
    endif()
  endforeach()
endfunction()