summaryrefslogtreecommitdiffstats
path: root/Modules/FindPkgConfig.cmake
blob: b6156dd45ad7f903f6ed3a6489bc505942d290b0 (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
#.rst:
# FindPkgConfig
# -------------
#
# A `pkg-config` module for CMake.
#
# Finds the ``pkg-config`` executable and add the
# :command:`pkg_check_modules` and :command:`pkg_search_module`
# commands.
#
# In order to find the ``pkg-config`` executable, it uses the
# :variable:`PKG_CONFIG_EXECUTABLE` variable or the ``PKG_CONFIG``
# environment variable first.

#=============================================================================
# Copyright 2006-2014 Kitware, Inc.
# Copyright 2014      Christoph GrĂ¼ninger <foss@grueninger.de>
# Copyright 2006      Enrico Scholz <enrico.scholz@informatik.tu-chemnitz.de>
# Copyright 2016      Rolf Eike Beer <eike@sf-mail.de>
#
# 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.)

### Common stuff ####
set(PKG_CONFIG_VERSION 1)

# find pkg-config, use PKG_CONFIG if set
if((NOT PKG_CONFIG_EXECUTABLE) AND (NOT "$ENV{PKG_CONFIG}" STREQUAL ""))
  set(PKG_CONFIG_EXECUTABLE "$ENV{PKG_CONFIG}" CACHE FILEPATH "pkg-config executable")
endif()
find_program(PKG_CONFIG_EXECUTABLE NAMES pkg-config DOC "pkg-config executable")
mark_as_advanced(PKG_CONFIG_EXECUTABLE)

if (PKG_CONFIG_EXECUTABLE)
  execute_process(COMMAND ${PKG_CONFIG_EXECUTABLE} --version
    OUTPUT_VARIABLE PKG_CONFIG_VERSION_STRING
    ERROR_QUIET
    OUTPUT_STRIP_TRAILING_WHITESPACE)
endif ()

include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
find_package_handle_standard_args(PkgConfig
                                  REQUIRED_VARS PKG_CONFIG_EXECUTABLE
                                  VERSION_VAR PKG_CONFIG_VERSION_STRING)

# This is needed because the module name is "PkgConfig" but the name of
# this variable has always been PKG_CONFIG_FOUND so this isn't automatically
# handled by FPHSA.
set(PKG_CONFIG_FOUND "${PKGCONFIG_FOUND}")

# Unsets the given variables
macro(_pkgconfig_unset var)
  set(${var} "" CACHE INTERNAL "")
endmacro()

macro(_pkgconfig_set var value)
  set(${var} ${value} CACHE INTERNAL "")
endmacro()

# Invokes pkgconfig, cleans up the result and sets variables
macro(_pkgconfig_invoke _pkglist _prefix _varname _regexp)
  set(_pkgconfig_invoke_result)

  execute_process(
    COMMAND ${PKG_CONFIG_EXECUTABLE} ${ARGN} ${_pkglist}
    OUTPUT_VARIABLE _pkgconfig_invoke_result
    RESULT_VARIABLE _pkgconfig_failed
    OUTPUT_STRIP_TRAILING_WHITESPACE)

  if (_pkgconfig_failed)
    set(_pkgconfig_${_varname} "")
    _pkgconfig_unset(${_prefix}_${_varname})
  else()
    string(REGEX REPLACE "[\r\n]"                  " " _pkgconfig_invoke_result "${_pkgconfig_invoke_result}")

    if (NOT ${_regexp} STREQUAL "")
      string(REGEX REPLACE "${_regexp}" " " _pkgconfig_invoke_result "${_pkgconfig_invoke_result}")
    endif()

    separate_arguments(_pkgconfig_invoke_result)

    #message(STATUS "  ${_varname} ... ${_pkgconfig_invoke_result}")
    set(_pkgconfig_${_varname} ${_pkgconfig_invoke_result})
    _pkgconfig_set(${_prefix}_${_varname} "${_pkgconfig_invoke_result}")
  endif()
endmacro()

#[========================================[.rst:
.. command:: pkg_get_variable

  Retrieves the value of a variable from a package::

    pkg_get_variable(<RESULT> <MODULE> <VARIABLE>)

  For example:

  .. code-block:: cmake

    pkg_get_variable(GI_GIRDIR gobject-introspection-1.0 girdir)
#]========================================]
function (pkg_get_variable result pkg variable)
  _pkgconfig_invoke("${pkg}" "prefix" "result" "" "--variable=${variable}")
  set("${result}"
    "${prefix_result}"
    PARENT_SCOPE)
endfunction ()

# Invokes pkgconfig two times; once without '--static' and once with
# '--static'
macro(_pkgconfig_invoke_dyn _pkglist _prefix _varname cleanup_regexp)
  _pkgconfig_invoke("${_pkglist}" ${_prefix}        ${_varname} "${cleanup_regexp}" ${ARGN})
  _pkgconfig_invoke("${_pkglist}" ${_prefix} STATIC_${_varname} "${cleanup_regexp}" --static  ${ARGN})
endmacro()

# Splits given arguments into options and a package list
macro(_pkgconfig_parse_options _result _is_req _is_silent _no_cmake_path _no_cmake_environment_path _imp_target)
  set(${_is_req} 0)
  set(${_is_silent} 0)
  set(${_no_cmake_path} 0)
  set(${_no_cmake_environment_path} 0)
  set(${_imp_target} 0)
  if(DEFINED PKG_CONFIG_USE_CMAKE_PREFIX_PATH)
    if(NOT PKG_CONFIG_USE_CMAKE_PREFIX_PATH)
      set(${_no_cmake_path} 1)
      set(${_no_cmake_environment_path} 1)
    endif()
  elseif(CMAKE_MINIMUM_REQUIRED_VERSION VERSION_LESS 3.1)
    set(${_no_cmake_path} 1)
    set(${_no_cmake_environment_path} 1)
  endif()

  foreach(_pkg ${ARGN})
    if (_pkg STREQUAL "REQUIRED")
      set(${_is_req} 1)
    endif ()
    if (_pkg STREQUAL "QUIET")
      set(${_is_silent} 1)
    endif ()
    if (_pkg STREQUAL "NO_CMAKE_PATH")
      set(${_no_cmake_path} 1)
    endif()
    if (_pkg STREQUAL "NO_CMAKE_ENVIRONMENT_PATH")
      set(${_no_cmake_environment_path} 1)
    endif()
    if (_pkg STREQUAL "IMPORTED_TARGET")
      set(${_imp_target} 1)
    endif()
  endforeach()

  set(${_result} ${ARGN})
  list(REMOVE_ITEM ${_result} "REQUIRED")
  list(REMOVE_ITEM ${_result} "QUIET")
  list(REMOVE_ITEM ${_result} "NO_CMAKE_PATH")
  list(REMOVE_ITEM ${_result} "NO_CMAKE_ENVIRONMENT_PATH")
  list(REMOVE_ITEM ${_result} "IMPORTED_TARGET")
endmacro()

# Add the content of a variable or an environment variable to a list of
# paths
# Usage:
#  - _pkgconfig_add_extra_path(_extra_paths VAR)
#  - _pkgconfig_add_extra_path(_extra_paths ENV VAR)
function(_pkgconfig_add_extra_path _extra_paths_var _var)
  set(_is_env 0)
  if(ARGC GREATER 2 AND _var STREQUAL "ENV")
    set(_var ${ARGV2})
    set(_is_env 1)
  endif()
  if(NOT _is_env)
    if(NOT "${${_var}}" STREQUAL "")
      list(APPEND ${_extra_paths_var} ${${_var}})
    endif()
  else()
    if(NOT "$ENV{${_var}}" STREQUAL "")
      file(TO_CMAKE_PATH "$ENV{${_var}}" _path)
      list(APPEND ${_extra_paths_var} ${_path})
      unset(_path)
    endif()
  endif()
  set(${_extra_paths_var} ${${_extra_paths_var}} PARENT_SCOPE)
endfunction()

# scan the LDFLAGS returned by pkg-config for library directories and
# libraries, figure out the absolute paths of that libraries in the
# given directories, and create an imported target from them
function(_pkg_create_imp_target _prefix _no_cmake_path _no_cmake_environment_path)
  unset(_libs)
  unset(_find_opts)

  # set the options that are used as long as the .pc file does not provide a library
  # path to look into
  if(_no_cmake_path)
    set(_find_opts "NO_CMAKE_PATH")
  endif()
  if(_no_cmake_environment_path)
    string(APPEND _find_opts " NO_CMAKE_ENVIRONMENT_PATH")
  endif()

  foreach (flag IN LISTS ${_prefix}_LDFLAGS)
    if (flag MATCHES "^-L(.*)")
      # only look into the given paths from now on
      set(_find_opts "HINTS ${${CMAKE_MATCH_1}} NO_DEFAULT_PATH")
      continue()
    endif()
    if (flag MATCHES "^-l(.*)")
      set(_pkg_search "${CMAKE_MATCH_1}")
    else()
      continue()
    endif()

    find_library(pkgcfg_lib_${_prefix}_${_pkg_search}
                 NAMES ${_pkg_search}
                 ${_find_opts})
    list(APPEND _libs "${pkgcfg_lib_${_prefix}_${_pkg_search}}")
  endforeach()

  # only create the target if it is linkable, i.e. no executables
  if (NOT TARGET PkgConfig::${_prefix}
      AND ( ${_prefix}_INCLUDE_DIRS OR _libs OR ${_prefix}_CFLAGS_OTHER ))
    add_library(PkgConfig::${_prefix} INTERFACE IMPORTED)

    unset(_props)
    if(${_prefix}_INCLUDE_DIRS)
      set_property(TARGET PkgConfig::${_prefix} PROPERTY
                   INTERFACE_INCLUDE_DIRECTORIES "${${_prefix}_INCLUDE_DIRS}")
    endif()
    if(_libs)
      set_property(TARGET PkgConfig::${_prefix} PROPERTY
                   INTERFACE_LINK_LIBRARIES "${_libs}")
    endif()
    if(${_prefix}_CFLAGS_OTHER)
      set_property(TARGET PkgConfig::${_prefix} PROPERTY
                   INTERFACE_COMPILE_OPTIONS "${${_prefix}_CFLAGS_OTHER}")
    endif()
  endif()
endfunction()

###
macro(_pkg_check_modules_internal _is_required _is_silent _no_cmake_path _no_cmake_environment_path _imp_target _prefix)
  _pkgconfig_unset(${_prefix}_FOUND)
  _pkgconfig_unset(${_prefix}_VERSION)
  _pkgconfig_unset(${_prefix}_PREFIX)
  _pkgconfig_unset(${_prefix}_INCLUDEDIR)
  _pkgconfig_unset(${_prefix}_LIBDIR)
  _pkgconfig_unset(${_prefix}_LIBS)
  _pkgconfig_unset(${_prefix}_LIBS_L)
  _pkgconfig_unset(${_prefix}_LIBS_PATHS)
  _pkgconfig_unset(${_prefix}_LIBS_OTHER)
  _pkgconfig_unset(${_prefix}_CFLAGS)
  _pkgconfig_unset(${_prefix}_CFLAGS_I)
  _pkgconfig_unset(${_prefix}_CFLAGS_OTHER)
  _pkgconfig_unset(${_prefix}_STATIC_LIBDIR)
  _pkgconfig_unset(${_prefix}_STATIC_LIBS)
  _pkgconfig_unset(${_prefix}_STATIC_LIBS_L)
  _pkgconfig_unset(${_prefix}_STATIC_LIBS_PATHS)
  _pkgconfig_unset(${_prefix}_STATIC_LIBS_OTHER)
  _pkgconfig_unset(${_prefix}_STATIC_CFLAGS)
  _pkgconfig_unset(${_prefix}_STATIC_CFLAGS_I)
  _pkgconfig_unset(${_prefix}_STATIC_CFLAGS_OTHER)

  # create a better addressable variable of the modules and calculate its size
  set(_pkg_check_modules_list ${ARGN})
  list(LENGTH _pkg_check_modules_list _pkg_check_modules_cnt)

  if(PKG_CONFIG_EXECUTABLE)
    # give out status message telling checked module
    if (NOT ${_is_silent})
      if (_pkg_check_modules_cnt EQUAL 1)
        message(STATUS "Checking for module '${_pkg_check_modules_list}'")
      else()
        message(STATUS "Checking for modules '${_pkg_check_modules_list}'")
      endif()
    endif()

    set(_pkg_check_modules_packages)
    set(_pkg_check_modules_failed)

    set(_extra_paths)

    if(NOT _no_cmake_path)
      _pkgconfig_add_extra_path(_extra_paths CMAKE_PREFIX_PATH)
      _pkgconfig_add_extra_path(_extra_paths CMAKE_FRAMEWORK_PATH)
      _pkgconfig_add_extra_path(_extra_paths CMAKE_APPBUNDLE_PATH)
    endif()

    if(NOT _no_cmake_environment_path)
      _pkgconfig_add_extra_path(_extra_paths ENV CMAKE_PREFIX_PATH)
      _pkgconfig_add_extra_path(_extra_paths ENV CMAKE_FRAMEWORK_PATH)
      _pkgconfig_add_extra_path(_extra_paths ENV CMAKE_APPBUNDLE_PATH)
    endif()

    if(NOT "${_extra_paths}" STREQUAL "")
      # Save the PKG_CONFIG_PATH environment variable, and add paths
      # from the CMAKE_PREFIX_PATH variables
      set(_pkgconfig_path_old "$ENV{PKG_CONFIG_PATH}")
      set(_pkgconfig_path "${_pkgconfig_path_old}")
      if(NOT "${_pkgconfig_path}" STREQUAL "")
        file(TO_CMAKE_PATH "${_pkgconfig_path}" _pkgconfig_path)
      endif()

      # Create a list of the possible pkgconfig subfolder (depending on
      # the system
      set(_lib_dirs)
      if(NOT DEFINED CMAKE_SYSTEM_NAME
          OR (CMAKE_SYSTEM_NAME MATCHES "^(Linux|kFreeBSD|GNU)$"
              AND NOT CMAKE_CROSSCOMPILING))
        if(EXISTS "/etc/debian_version") # is this a debian system ?
          if(CMAKE_LIBRARY_ARCHITECTURE)
            list(APPEND _lib_dirs "lib/${CMAKE_LIBRARY_ARCHITECTURE}/pkgconfig")
          endif()
        else()
          # not debian, check the FIND_LIBRARY_USE_LIB32_PATHS and FIND_LIBRARY_USE_LIB64_PATHS properties
          get_property(uselib32 GLOBAL PROPERTY FIND_LIBRARY_USE_LIB32_PATHS)
          if(uselib32 AND CMAKE_SIZEOF_VOID_P EQUAL 4)
            list(APPEND _lib_dirs "lib32/pkgconfig")
          endif()
          get_property(uselib64 GLOBAL PROPERTY FIND_LIBRARY_USE_LIB64_PATHS)
          if(uselib64 AND CMAKE_SIZEOF_VOID_P EQUAL 8)
            list(APPEND _lib_dirs "lib64/pkgconfig")
          endif()
        endif()
      endif()
      list(APPEND _lib_dirs "lib/pkgconfig")
      list(APPEND _lib_dirs "share/pkgconfig")

      # Check if directories exist and eventually append them to the
      # pkgconfig path list
      foreach(_prefix_dir ${_extra_paths})
        foreach(_lib_dir ${_lib_dirs})
          if(EXISTS "${_prefix_dir}/${_lib_dir}")
            list(APPEND _pkgconfig_path "${_prefix_dir}/${_lib_dir}")
            list(REMOVE_DUPLICATES _pkgconfig_path)
          endif()
        endforeach()
      endforeach()

      # Prepare and set the environment variable
      if(NOT "${_pkgconfig_path}" STREQUAL "")
        # remove empty values from the list
        list(REMOVE_ITEM _pkgconfig_path "")
        file(TO_NATIVE_PATH "${_pkgconfig_path}" _pkgconfig_path)
        if(UNIX)
          string(REPLACE ";" ":" _pkgconfig_path "${_pkgconfig_path}")
          string(REPLACE "\\ " " " _pkgconfig_path "${_pkgconfig_path}")
        endif()
        set(ENV{PKG_CONFIG_PATH} "${_pkgconfig_path}")
      endif()

      # Unset variables
      unset(_lib_dirs)
      unset(_pkgconfig_path)
    endif()

    # iterate through module list and check whether they exist and match the required version
    foreach (_pkg_check_modules_pkg ${_pkg_check_modules_list})
      set(_pkg_check_modules_exist_query)

      # check whether version is given
      if (_pkg_check_modules_pkg MATCHES "(.*[^><])(>=|=|<=)(.*)")
        set(_pkg_check_modules_pkg_name "${CMAKE_MATCH_1}")
        set(_pkg_check_modules_pkg_op "${CMAKE_MATCH_2}")
        set(_pkg_check_modules_pkg_ver "${CMAKE_MATCH_3}")
      else()
        set(_pkg_check_modules_pkg_name "${_pkg_check_modules_pkg}")
        set(_pkg_check_modules_pkg_op)
        set(_pkg_check_modules_pkg_ver)
      endif()

      # handle the operands
      if (_pkg_check_modules_pkg_op STREQUAL ">=")
        list(APPEND _pkg_check_modules_exist_query --atleast-version)
      endif()

      if (_pkg_check_modules_pkg_op STREQUAL "=")
        list(APPEND _pkg_check_modules_exist_query --exact-version)
      endif()

      if (_pkg_check_modules_pkg_op STREQUAL "<=")
        list(APPEND _pkg_check_modules_exist_query --max-version)
      endif()

      # create the final query which is of the format:
      # * --atleast-version <version> <pkg-name>
      # * --exact-version <version> <pkg-name>
      # * --max-version <version> <pkg-name>
      # * --exists <pkg-name>
      if (_pkg_check_modules_pkg_op)
        list(APPEND _pkg_check_modules_exist_query "${_pkg_check_modules_pkg_ver}")
      else()
        list(APPEND _pkg_check_modules_exist_query --exists --print-errors --short-errors)
      endif()

      _pkgconfig_unset(${_prefix}_${_pkg_check_modules_pkg_name}_VERSION)
      _pkgconfig_unset(${_prefix}_${_pkg_check_modules_pkg_name}_PREFIX)
      _pkgconfig_unset(${_prefix}_${_pkg_check_modules_pkg_name}_INCLUDEDIR)
      _pkgconfig_unset(${_prefix}_${_pkg_check_modules_pkg_name}_LIBDIR)

      list(APPEND _pkg_check_modules_exist_query "${_pkg_check_modules_pkg_name}")
      list(APPEND _pkg_check_modules_packages    "${_pkg_check_modules_pkg_name}")

      # execute the query
      execute_process(
        COMMAND ${PKG_CONFIG_EXECUTABLE} ${_pkg_check_modules_exist_query}
        RESULT_VARIABLE _pkgconfig_retval
        ERROR_VARIABLE _pkgconfig_error
        ERROR_STRIP_TRAILING_WHITESPACE)

      # evaluate result and tell failures
      if (_pkgconfig_retval)
        if(NOT ${_is_silent})
          message(STATUS "  ${_pkgconfig_error}")
        endif()

        set(_pkg_check_modules_failed 1)
      endif()
    endforeach()

    if(_pkg_check_modules_failed)
      # fail when requested
      if (${_is_required})
        message(FATAL_ERROR "A required package was not found")
      endif ()
    else()
      # when we are here, we checked whether requested modules
      # exist. Now, go through them and set variables

      _pkgconfig_set(${_prefix}_FOUND 1)
      list(LENGTH _pkg_check_modules_packages pkg_count)

      # iterate through all modules again and set individual variables
      foreach (_pkg_check_modules_pkg ${_pkg_check_modules_packages})
        # handle case when there is only one package required
        if (pkg_count EQUAL 1)
          set(_pkg_check_prefix "${_prefix}")
        else()
          set(_pkg_check_prefix "${_prefix}_${_pkg_check_modules_pkg}")
        endif()

        _pkgconfig_invoke(${_pkg_check_modules_pkg} "${_pkg_check_prefix}" VERSION    ""   --modversion )
        pkg_get_variable("${_pkg_check_prefix}_PREFIX" ${_pkg_check_modules_pkg} "prefix")
        pkg_get_variable("${_pkg_check_prefix}_INCLUDEDIR" ${_pkg_check_modules_pkg} "includedir")
        pkg_get_variable("${_pkg_check_prefix}_LIBDIR" ${_pkg_check_modules_pkg} "libdir")
        foreach (variable IN ITEMS PREFIX INCLUDEDIR LIBDIR)
          _pkgconfig_set("${_pkg_check_prefix}_${variable}" "${${_pkg_check_prefix}_${variable}}")
        endforeach ()

        if (NOT ${_is_silent})
          message(STATUS "  Found ${_pkg_check_modules_pkg}, version ${_pkgconfig_VERSION}")
        endif ()
      endforeach()

      # set variables which are combined for multiple modules
      _pkgconfig_invoke_dyn("${_pkg_check_modules_packages}" "${_prefix}" LIBRARIES           "(^| )-l" --libs-only-l )
      _pkgconfig_invoke_dyn("${_pkg_check_modules_packages}" "${_prefix}" LIBRARY_DIRS        "(^| )-L" --libs-only-L )
      _pkgconfig_invoke_dyn("${_pkg_check_modules_packages}" "${_prefix}" LDFLAGS             ""        --libs )
      _pkgconfig_invoke_dyn("${_pkg_check_modules_packages}" "${_prefix}" LDFLAGS_OTHER       ""        --libs-only-other )

      _pkgconfig_invoke_dyn("${_pkg_check_modules_packages}" "${_prefix}" INCLUDE_DIRS        "(^| )-I" --cflags-only-I )
      _pkgconfig_invoke_dyn("${_pkg_check_modules_packages}" "${_prefix}" CFLAGS              ""        --cflags )
      _pkgconfig_invoke_dyn("${_pkg_check_modules_packages}" "${_prefix}" CFLAGS_OTHER        ""        --cflags-only-other )

      if (_imp_target)
        _pkg_create_imp_target("${_prefix}" _no_cmake_path _no_cmake_environment_path)
      endif()
    endif()

    if(NOT "${_extra_paths}" STREQUAL "")
      # Restore the environment variable
      set(ENV{PKG_CONFIG_PATH} "${_pkgconfig_path_old}")
    endif()

    unset(_extra_paths)
    unset(_pkgconfig_path_old)
  else()
    if (${_is_required})
      message(SEND_ERROR "pkg-config tool not found")
    endif ()
  endif()
endmacro()

###
### User visible macros start here
###

#[========================================[.rst:
.. command:: pkg_check_modules

 Checks for all the given modules. ::

    pkg_check_modules(<PREFIX> [REQUIRED] [QUIET]
                      [NO_CMAKE_PATH] [NO_CMAKE_ENVIRONMENT_PATH]
                      [IMPORTED_TARGET]
                      <MODULE> [<MODULE>]*)


 When the ``REQUIRED`` argument was set, macros will fail with an error
 when module(s) could not be found.

 When the ``QUIET`` argument is set, no status messages will be printed.

 By default, if :variable:`CMAKE_MINIMUM_REQUIRED_VERSION` is 3.1 or
 later, or if :variable:`PKG_CONFIG_USE_CMAKE_PREFIX_PATH` is set, the
 :variable:`CMAKE_PREFIX_PATH`, :variable:`CMAKE_FRAMEWORK_PATH`, and
 :variable:`CMAKE_APPBUNDLE_PATH` cache and environment variables will
 be added to ``pkg-config`` search path.
 The ``NO_CMAKE_PATH`` and ``NO_CMAKE_ENVIRONMENT_PATH`` arguments
 disable this behavior for the cache variables and the environment
 variables, respectively.
 The ``IMPORTED_TARGET`` argument will create an imported target named
 PkgConfig::<PREFIX>> that can be passed directly as an argument to
 :command:`target_link_libraries`.

 It sets the following variables: ::

    PKG_CONFIG_FOUND          ... if pkg-config executable was found
    PKG_CONFIG_EXECUTABLE     ... pathname of the pkg-config program
    PKG_CONFIG_VERSION_STRING ... the version of the pkg-config program found
                                  (since CMake 2.8.8)

 For the following variables two sets of values exist; first one is the
 common one and has the given PREFIX.  The second set contains flags
 which are given out when ``pkg-config`` was called with the ``--static``
 option. ::

    <XPREFIX>_FOUND          ... set to 1 if module(s) exist
    <XPREFIX>_LIBRARIES      ... only the libraries (w/o the '-l')
    <XPREFIX>_LIBRARY_DIRS   ... the paths of the libraries (w/o the '-L')
    <XPREFIX>_LDFLAGS        ... all required linker flags
    <XPREFIX>_LDFLAGS_OTHER  ... all other linker flags
    <XPREFIX>_INCLUDE_DIRS   ... the '-I' preprocessor flags (w/o the '-I')
    <XPREFIX>_CFLAGS         ... all required cflags
    <XPREFIX>_CFLAGS_OTHER   ... the other compiler flags

 ::

    <XPREFIX> = <PREFIX>        for common case
    <XPREFIX> = <PREFIX>_STATIC for static linking

 There are some special variables whose prefix depends on the count of
 given modules.  When there is only one module, <PREFIX> stays
 unchanged.  When there are multiple modules, the prefix will be
 changed to <PREFIX>_<MODNAME>: ::

    <XPREFIX>_VERSION    ... version of the module
    <XPREFIX>_PREFIX     ... prefix-directory of the module
    <XPREFIX>_INCLUDEDIR ... include-dir of the module
    <XPREFIX>_LIBDIR     ... lib-dir of the module

 ::

    <XPREFIX> = <PREFIX>  when |MODULES| == 1, else
    <XPREFIX> = <PREFIX>_<MODNAME>

 A <MODULE> parameter can have the following formats: ::

    {MODNAME}            ... matches any version
    {MODNAME}>={VERSION} ... at least version <VERSION> is required
    {MODNAME}={VERSION}  ... exactly version <VERSION> is required
    {MODNAME}<={VERSION} ... modules must not be newer than <VERSION>

 Examples

 .. code-block:: cmake

    pkg_check_modules (GLIB2   glib-2.0)

 .. code-block:: cmake

    pkg_check_modules (GLIB2   glib-2.0>=2.10)

 Requires at least version 2.10 of glib2 and defines e.g.
 ``GLIB2_VERSION=2.10.3``

 .. code-block:: cmake

    pkg_check_modules (FOO     glib-2.0>=2.10 gtk+-2.0)

 Requires both glib2 and gtk2, and defines e.g.
 ``FOO_glib-2.0_VERSION=2.10.3`` and ``FOO_gtk+-2.0_VERSION=2.8.20``

 .. code-block:: cmake

    pkg_check_modules (XRENDER REQUIRED xrender)

 Defines for example::

   XRENDER_LIBRARIES=Xrender;X11``
   XRENDER_STATIC_LIBRARIES=Xrender;X11;pthread;Xau;Xdmcp
#]========================================]
macro(pkg_check_modules _prefix _module0)
  _pkgconfig_parse_options(_pkg_modules _pkg_is_required _pkg_is_silent _no_cmake_path _no_cmake_environment_path _imp_target "${_module0}" ${ARGN})
  # check cached value
  if (NOT DEFINED __pkg_config_checked_${_prefix} OR __pkg_config_checked_${_prefix} LESS ${PKG_CONFIG_VERSION} OR NOT ${_prefix}_FOUND)
    _pkg_check_modules_internal("${_pkg_is_required}" "${_pkg_is_silent}" ${_no_cmake_path} ${_no_cmake_environment_path} ${_imp_target} "${_prefix}" ${_pkg_modules})

    _pkgconfig_set(__pkg_config_checked_${_prefix} ${PKG_CONFIG_VERSION})
  elseif (${_prefix}_FOUND AND ${_imp_target})
    _pkg_create_imp_target("${_prefix}" _no_cmake_path _no_cmake_environment_path)
  endif()
endmacro()


#[========================================[.rst:
.. command:: pkg_search_module

 Same as :command:`pkg_check_modules`, but instead it checks for given
 modules and uses the first working one. ::

    pkg_search_module(<PREFIX> [REQUIRED] [QUIET]
                      [NO_CMAKE_PATH] [NO_CMAKE_ENVIRONMENT_PATH]
                      [IMPORTED_TARGET]
                      <MODULE> [<MODULE>]*)

 Examples

 .. code-block:: cmake

    pkg_search_module (BAR     libxml-2.0 libxml2 libxml>=2)
#]========================================]
macro(pkg_search_module _prefix _module0)
  _pkgconfig_parse_options(_pkg_modules_alt _pkg_is_required _pkg_is_silent _no_cmake_path _no_cmake_environment_path _imp_target "${_module0}" ${ARGN})
  # check cached value
  if (NOT DEFINED __pkg_config_checked_${_prefix} OR __pkg_config_checked_${_prefix} LESS ${PKG_CONFIG_VERSION} OR NOT ${_prefix}_FOUND)
    set(_pkg_modules_found 0)

    if (NOT ${_pkg_is_silent})
      message(STATUS "Checking for one of the modules '${_pkg_modules_alt}'")
    endif ()

    # iterate through all modules and stop at the first working one.
    foreach(_pkg_alt ${_pkg_modules_alt})
      if(NOT _pkg_modules_found)
        _pkg_check_modules_internal(0 1 ${_no_cmake_path} ${_no_cmake_environment_path} ${_imp_target} "${_prefix}" "${_pkg_alt}")
      endif()

      if (${_prefix}_FOUND)
        set(_pkg_modules_found 1)
      endif()
    endforeach()

    if (NOT ${_prefix}_FOUND)
      if(${_pkg_is_required})
        message(SEND_ERROR "None of the required '${_pkg_modules_alt}' found")
      endif()
    endif()

    _pkgconfig_set(__pkg_config_checked_${_prefix} ${PKG_CONFIG_VERSION})
  elseif (${_prefix}_FOUND AND ${_imp_target})
    _pkg_create_imp_target("${_prefix}" _no_cmake_path _no_cmake_environment_path)
  endif()
endmacro()


#[========================================[.rst:
.. variable:: PKG_CONFIG_EXECUTABLE

 Path to the pkg-config executable.


.. variable:: PKG_CONFIG_USE_CMAKE_PREFIX_PATH

 Whether :command:`pkg_check_modules` and :command:`pkg_search_module`
 should add the paths in :variable:`CMAKE_PREFIX_PATH`,
 :variable:`CMAKE_FRAMEWORK_PATH`, and :variable:`CMAKE_APPBUNDLE_PATH`
 cache and environment variables to ``pkg-config`` search path.

 If this variable is not set, this behavior is enabled by default if
 :variable:`CMAKE_MINIMUM_REQUIRED_VERSION` is 3.1 or later, disabled
 otherwise.
#]========================================]


### Local Variables:
### mode: cmake
### End: