summaryrefslogtreecommitdiff
path: root/lib/mkmf.rb
blob: 494838e63b952e26c0e47f13b367562ffa2280bf (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
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
# module to create Makefile for extension modules
# invoke like: ruby -r mkmf extconf.rb

require 'rbconfig'
require 'fileutils'
require 'shellwords'

CONFIG = Config::MAKEFILE_CONFIG
ORIG_LIBPATH = ENV['LIB']

SRC_EXT = ["c", "cc", "m", "cxx", "cpp", "C"]
$static = $config_h = nil

unless defined? $configure_args
  $configure_args = {}
  args = CONFIG["configure_args"]
  if ENV["CONFIGURE_ARGS"]
    args << " " << ENV["CONFIGURE_ARGS"]
  end
  for arg in Shellwords::shellwords(args)
    arg, val = arg.split('=', 2)
    next unless arg
    arg.tr!('_', '-')
    if arg.sub!(/^(?!--)/, '--')
      val or next
      arg.downcase!
    end
    next if /^--(?:top|topsrc|src|cur)dir$/ =~ arg
    $configure_args[arg] = val || true
  end
  for arg in ARGV
    arg, val = arg.split('=', 2)
    next unless arg
    arg.tr!('_', '-')
    if arg.sub!(/^(?!--)/, '--')
      val or next
      arg.downcase!
    end
    $configure_args[arg] = val || true
  end
end

$srcdir = CONFIG["srcdir"]
$libdir = CONFIG["libdir"]
$rubylibdir = CONFIG["rubylibdir"]
$archdir = CONFIG["archdir"]
$sitedir = CONFIG["sitedir"]
$sitelibdir = CONFIG["sitelibdir"]
$sitearchdir = CONFIG["sitearchdir"]

$mswin = /mswin/ =~ RUBY_PLATFORM
$bccwin = /bccwin/ =~ RUBY_PLATFORM
$mingw = /mingw/ =~ RUBY_PLATFORM
$cygwin = /cygwin/ =~ RUBY_PLATFORM
$human = /human/ =~ RUBY_PLATFORM
$netbsd = /netbsd/ =~ RUBY_PLATFORM
$os2 = /os2/ =~ RUBY_PLATFORM

def config_string(key, config = CONFIG)
  s = config[key] and !s.empty? and block_given? ? yield(s) : s
end

def dir_re(dir)
  Regexp.new('\$(?:\('+dir+'\)|\{'+dir+'\})(?:\$\(target_prefix\)|\{target_prefix\})?')
end

INSTALL_DIRS = [
  [dir_re('commondir'), "$(RUBYCOMMONDIR)"],
  [dir_re("sitedir"), "$(RUBYCOMMONDIR)"],
  [dir_re('rubylibdir'), "$(RUBYLIBDIR)"],
  [dir_re('archdir'), "$(RUBYARCHDIR)"],
  [dir_re('sitelibdir'), "$(RUBYLIBDIR)"],
  [dir_re('sitearchdir'), "$(RUBYARCHDIR)"]
]

def map_dir(dir, map = nil)
  map ||= INSTALL_DIRS
  map.inject(dir) {|dir, (orig, new)| dir.gsub(orig, new)}
end

libdir = File.dirname(__FILE__)
$extmk = libdir != Config::CONFIG["rubylibdir"]
if not $extmk and File.exist? Config::CONFIG["archdir"] + "/ruby.h"
  $hdrdir = $topdir = Config::CONFIG["archdir"]
elsif File.exist? $srcdir + "/ruby.h"
  $topdir = Config::CONFIG["compile_dir"]
  $hdrdir = $srcdir
else
  abort "can't find header files for ruby."
end

OUTFLAG = CONFIG['OUTFLAG']
CPPOUTFILE = CONFIG['CPPOUTFILE']

CONFTEST_C = "conftest.c"

class String
  def quote
    /\s/ =~ self ? "\"#{self}\"" : self
  end
end
class Array
  def quote
    map {|s| s.quote}
  end
end

def rm_f(*files)
  FileUtils.rm_f(Dir[files.join("\0")])
end

def modified?(target, times)
  (t = File.mtime(target)) rescue return nil
  Array === times or times = [times]
  t if times.all? {|n| n <= t}
end

def merge_libs(*libs)
  libs.inject([]) do |x, y|
    xy = x & y
    xn = yn = 0
    y = y.inject([]) {|ary, e| ary.last == e ? ary : ary << e}
    y.each_with_index do |v, yi|
      if xy.include?(v)
        xi = [x.index(v), xn].max()
        x[xi, 1] = y[yn..yi]
        xn, yn = xi + (yi - yn + 1), yi + 1
      end
    end
    x.concat(y[yn..-1] || [])
  end
end

module Logging
  @log = nil
  @logfile = 'mkmf.log'
  @orgerr = $stderr.dup
  @orgout = $stdout.dup

  def self::open
    @log ||= File::open(@logfile, 'w')
    @log.sync = true
    $stderr.reopen(@log)
    $stdout.reopen(@log)
    yield
  ensure
    $stderr.reopen(@orgerr)
    $stdout.reopen(@orgout)
  end

  def self::message(*s)
    @log ||= File::open(@logfile, 'w')
    @log.sync = true
    @log.printf(*s)
  end

  def self::logfile file
    @logfile = file
    if @log and not @log.closed?
      @log.flush
      @log.close
      @log = nil
    end
  end
  
  def self::postpone
    tmplog = "mkmftmp.log"
    open do
      log, *save = @log, @logfile, @orgout, @orgerr
      @log, @logfile, @orgout, @orgerr = nil, tmplog, log, log
      begin
        log.print(open {yield})
        @log.close
        File::open(tmplog) {|t| FileUtils.copy_stream(t, log)}
      ensure
        @log, @logfile, @orgout, @orgerr = log, *save
        rm_f tmplog
      end
    end
  end
end

def xsystem command
  Config.expand(command)
  Logging::open do
    puts command.quote
    system(command)
  end
end

def xpopen command, *mode, &block
  Config.expand(command)
  Logging::open do
    case mode[0]
    when nil, /^r/
      puts "#{command} |"
    else
      puts "| #{command}"
    end
    IO.popen(command, *mode, &block)
  end
end

def log_src(src)
  Logging::message <<"EOM", src
checked program was:
/* begin */
%s/* end */

EOM
end

def create_tmpsrc(src)
  src = yield(src) if block_given?
  src = src.sub(/[^\n]\z/, "\\&\n")
  open(CONFTEST_C, "wb") do |cfile|
    cfile.print src
  end
  src
end

def try_do(src, command, &b)
  src = create_tmpsrc(src, &b)
  xsystem(command)
ensure
  log_src(src)
end

def link_command(ldflags, opt="", libpath=$LIBPATH)
  Config::expand(TRY_LINK.dup,
		 'hdrdir' => $hdrdir,
		 'src' => CONFTEST_C,
		 'INCFLAGS' => $INCFLAGS,
		 'CPPFLAGS' => $CPPFLAGS,
		 'CFLAGS' => "#$CFLAGS",
		 'ARCH_FLAG' => "#$ARCH_FLAG",
		 'LDFLAGS' => "#$LDFLAGS #{ldflags}",
		 'LIBPATH' => libpathflag(libpath),
		 'LOCAL_LIBS' => "#$LOCAL_LIBS #$libs",
		 'LIBS' => "#$LIBRUBYARG_STATIC #{opt} #$LIBS")
end

def cc_command(opt="")
  "$(CC) -c #$INCFLAGS -I#{$hdrdir} " \
  "#$CPPFLAGS #$CFLAGS #$ARCH_FLAG #{opt} #{CONFTEST_C}"
end

def cpp_command(outfile, opt="")
  "$(CPP) #$INCFLAGS -I#{$hdrdir} " \
  "#$CPPFLAGS #$CFLAGS #{opt} #{CONFTEST_C} #{outfile}"
end

def libpathflag(libpath=$LIBPATH)
  libpath.map{|x|
    (x == "$(topdir)" ? LIBPATHFLAG : LIBPATHFLAG+RPATHFLAG) % x
  }.join
end

def try_link0(src, opt="", &b)
  try_do(src, link_command("", opt), &b)
end

def try_link(src, opt="", &b)
  try_link0(src, opt, &b)
ensure
  rm_f "conftest*", "c0x32*"
end

def try_compile(src, opt="", &b)
  try_do(src, cc_command(opt), &b)
ensure
  rm_f "conftest*"
end

def try_cpp(src, opt="", &b)
  try_do(src, cpp_command(CPPOUTFILE, opt), &b)
ensure
  rm_f "conftest*"
end

def cpp_include(header)
  if header
    header = [header] unless header.kind_of? Array
    header.map {|h| "#include <#{h}>\n"}.join
  else
    ""
  end
end

def try_static_assert(expr, headers = nil, opt = "", &b)
  headers = cpp_include(headers)
  try_compile(<<SRC, opt, &b)
#{COMMON_HEADERS}
#{headers}
/*top*/
int tmp[(#{expr}) ? 1 : -1];
SRC
end

def try_constant(const, headers = nil, opt = "", &b)
  headers = cpp_include(headers)
  if CROSS_COMPILING
    unless try_compile(<<"SRC", opt, &b)
#{COMMON_HEADERS}
#{headers}
/*top*/
int tmp = #{const};
SRC
      return nil
    end
    if try_static_assert("#{const} < 0", headers, opt)
      neg = true
      const = "-(#{const})"
    elsif try_static_assert("#{const} == 0", headers, opt)
      return 0
    end
    upper = 1
    until try_static_assert("#{const} < #{upper}", headers, opt)
      lower = upper
      upper <<= 1
    end
    return nil unless lower
    until try_static_assert("#{const} == #{upper}", headers, opt)
      if try_static_assert("#{const} > #{(upper+lower)/2}", headers, opt)
        lower = (upper+lower)/2
      else
        upper = (upper+lower)/2
      end
    end
    upper = -upper if neg
    return upper
  else
    src = %{#{COMMON_HEADERS}
#{headers}
#include <stdio.h>
/*top*/
int main() {printf("%d\\n", (int)(#{const})); return 0;}
}
    if try_link0(src, opt, &b)
      xpopen("./conftest") do |f|
        return Integer(f.gets)
      end
    end
  end
  nil
end

def try_func(func, libs, headers = nil, &b)
  headers = cpp_include(headers)
  try_link(<<"SRC", libs, &b) or try_link(<<"SRC", libs, &b)
#{headers}
/*top*/
int main() { return 0; }
int t() { #{func}(); return 0; }
SRC
#{COMMON_HEADERS}
#{headers}
/*top*/
int main() { return 0; }
int t() { void ((*volatile p)()); p = (void ((*)()))#{func}; return 0; }
SRC
end

def egrep_cpp(pat, src, opt = "", &b)
  src = create_tmpsrc(src, &b)
  xpopen(cpp_command('', opt)) do |f|
    if Regexp === pat
      puts("    ruby -ne 'print if #{pat.inspect}'")
      f.grep(pat) {|l|
	puts "#{f.lineno}: #{l}"
	return true
      }
      false
    else
      puts("    egrep '#{pat}'")
      begin
	stdin = $stdin.dup
	$stdin.reopen(f)
	system("egrep", pat)
      ensure
	$stdin.reopen(stdin)
      end
    end
  end
ensure
  rm_f "conftest*"
  log_src(src)
end

def macro_defined?(macro, src, opt = "", &b)
  src = src.sub(/[^\n]\z/, "\\&\n")
  try_cpp(src + <<"SRC", opt, &b)
/*top*/
#ifndef #{macro}
# error
#endif
SRC
end

def try_run(src, opt = "", &b)
  if try_link0(src, opt, &b)
    xsystem("./conftest")
  else
    nil
  end
ensure
  rm_f "conftest*"
end

def install_files(mfile, ifiles, map = nil, srcprefix = nil)
  ifiles or return
  srcprefix ||= '$(srcdir)'
  Config::expand(srcdir = srcprefix.dup)
  dirs = []
  path = Hash.new {|h, i| h[i] = dirs.push([i])[-1]}
  ifiles.each do |files, dir, prefix|
    dir = map_dir(dir, map)
    prefix = %r|\A#{Regexp.quote(prefix)}/?| if prefix
    if( files[0,2] == "./" )
      # install files which are in current working directory.
      files = files[2..-1]
      len = nil
    else
      # install files which are under the $(srcdir).
      files = File.join(srcdir, files)
      len = srcdir.size
    end
    f = nil
    Dir.glob(files) do |f|
      f[0..len] = "" if len
      d = File.dirname(f)
      d.sub!(prefix, "") if prefix
      d = (d.empty? || d == ".") ? dir : File.join(dir, d)
      f = File.join(srcprefix, f) if len
      path[d] << f
    end
    unless len or f
      d = File.dirname(files)
      d.sub!(prefix, "") if prefix
      d = (d.empty? || d == ".") ? dir : File.join(dir, d)
      path[d] << files
    end
  end
  dirs
end

def install_rb(mfile, dest, srcdir = nil)
  install_files(mfile, [["lib/**/*.rb", dest, "lib"]], nil, srcdir)
end

def append_library(libs, lib)
  format(LIBARG, lib) + " " + libs
end

def message(*s)
  unless $extmk and not $VERBOSE
    printf(*s)
    $stdout.flush
  end
end

def checking_for(m)
  f = caller[0][/in `(.*)'$/, 1] and f << ": " #` for vim
  m = "checking for #{m}... "
  message "%s", m
  a = r = nil
  Logging::postpone do
    r = yield
    a = r ? "yes\n" : "no\n"
    "#{f}#{m}-------------------- #{a}\n"
  end
  message(a)
  Logging::message "--------------------\n\n"
  r
end

def have_library(lib, func = nil, header=nil, &b)
  func = "main" if !func or func.empty?
  lib = with_config(lib+'lib', lib)
  checking_for "#{func}() in #{LIBARG%lib}" do
    if COMMON_LIBS.include?(lib)
      true
    else
      libs = append_library($libs, lib)
      if try_func(func, libs, header, &b)
        $libs = libs
        true
      else
        false
      end
    end
  end
end

def find_library(lib, func, *paths, &b)
  func = "main" if !func or func.empty?
  lib = with_config(lib+'lib', lib)
  checking_for "#{func}() in #{LIBARG%lib}" do
    libpath = $LIBPATH
    libs = append_library($libs, lib)
    begin
      until r = try_func(func, libs, &b) or paths.empty?
	$LIBPATH = libpath | [paths.shift]
      end
      if r
	$libs = libs
	libpath = nil
      end
    ensure
      $LIBPATH = libpath if libpath
    end
    r
  end
end

def have_func(func, headers = nil, &b)
  checking_for "#{func}()" do
    if try_func(func, $libs, headers, &b)
      $defs.push(format("-DHAVE_%s", func.upcase))
      true
    else
      false
    end
  end
end

def have_header(header, &b)
  checking_for header do
    if try_cpp(cpp_include(header), &b)
      $defs.push(format("-DHAVE_%s", header.tr("a-z./\055", "A-Z___")))
      true
    else
      false
    end
  end
end

def have_struct_member(type, member, header = nil, &b)
  checking_for "#{type}.#{member}" do
    if try_compile(<<"SRC", &b)
#{COMMON_HEADERS}
#{cpp_include(header)}
/*top*/
int main() { return 0; }
int s = (char *)&((#{type}*)0)->#{member} - (char *)0;
SRC
      $defs.push(format("-DHAVE_ST_%s", member.upcase))
      true
    else
      false
    end
  end
end

def have_type(type, header = nil, opt = "", &b)
  checking_for type do
    header = cpp_include(header)
    if try_compile(<<"SRC", opt, &b) or (/\A\w+\z/n =~ type && try_compile(<<"SRC", opt, &b))
#{COMMON_HEADERS}
#{header}
/*top*/
static #{type} t;
SRC
#{COMMON_HEADERS}
#{header}
/*top*/
static #{type} *t;
SRC
      $defs.push(format("-DHAVE_TYPE_%s", type.strip.upcase.tr_s("^A-Z0-9_", "_")))
      true
    else
      false
    end
  end
end

def check_sizeof(type, header = nil, &b)
  expr = "sizeof(#{type})"
  m = "checking size of #{type}... "
  message "%s", m
  Logging::message "check_sizeof: %s--------------------\n", m
  if size = try_constant(expr, header, &b)
    $defs.push(format("-DSIZEOF_%s=%d", type.upcase.tr_s("^A-Z0-9_", "_"), size))
  end
  message(a = size ? "#{size}\n" : "failed\n")
  Logging::message "-------------------- %s\n", a
  size
end

def find_executable0(bin, path = nil)
  path = (path || ENV['PATH']).split(File::PATH_SEPARATOR)
  ext = config_string('EXEEXT')
  file = nil
  path.each do |dir|
    return file if File.executable?(file = File.join(dir, bin))
    return file if ext and File.executable?(file << ext)
  end
  nil
end

def find_executable(bin, path = nil)
  checking_for bin do
    find_executable0(bin, path)
  end
end

def arg_config(config, default=nil)
  $configure_args.fetch(config.tr('_', '-'), default)
end

def with_config(config, default=nil)
  unless /^--with[-_]/ =~ config
    config = '--with-' + config
  end
  arg_config(config, default)
end

def enable_config(config, default=nil)
  if arg_config("--enable-"+config)
    true
  elsif arg_config("--disable-"+config)
    false
  else
    default
  end
end

def create_header(header = "extconf.h")
  message "creating %s\n", header
  if $defs.length > 0
    sym = header.tr("a-z./\055", "A-Z___")
    open(header, "w") do |hfile|
      hfile.print "#ifndef #{sym}\n#define #{sym}\n"
      for line in $defs
	case line
	when /^-D([^=]+)(?:=(.*))?/
	  hfile.print "#define #$1 #{$2 || 1}\n"
	when /^-U(.*)/
	  hfile.print "#undef #$1\n"
	end
      end
      hfile.print "#endif\n"
    end
  end
end

def dir_config(target, idefault=nil, ldefault=nil)
  if dir = with_config(target + "-dir", (idefault unless ldefault))
    defaults = dir.split(File::PATH_SEPARATOR)
    idefault = ldefault = nil
  end

  idir = with_config(target + "-include", idefault)
  ldir = with_config(target + "-lib", ldefault)

#  idirs = idir ? idir.split(File::PATH_SEPARATOR) : []
  idirs = idir.split(File::PATH_SEPARATOR) rescue []
  if defaults
    idirs.concat(defaults.collect {|dir| dir + "/include"})
    idir = ([idir] + idirs).compact.join(File::PATH_SEPARATOR)
  end
  unless idirs.empty?
    idirs.collect! {|dir| "-I" + dir}
    idirs -= Shellwords.shellwords($CPPFLAGS)
    unless idirs.empty?
      $CPPFLAGS = (idirs.quote << $CPPFLAGS).join(" ")
    end
  end

  ldirs = ldir ? ldir.split(File::PATH_SEPARATOR) : []
  if defaults
    ldirs.concat(defaults.collect {|dir| dir + "/lib"})
    ldir = ([ldir] + ldirs).compact.join(File::PATH_SEPARATOR)
  end
  $LIBPATH = ldirs | $LIBPATH

  [idir, ldir]
end

def pkg_config(pkg)
  unless defined?($PKGCONFIG)
    if pkgconfig = with_config("pkg-config", !CROSS_COMPILING && "pkg-config")
      find_executable0(pkgconfig) or pkgconfig = nil
    end
    $PKGCONFIG = pkgconfig
  end
  if $PKGCONFIG and system("#{$PKGCONFIG} --exists #{pkg}")
    cflags = `#{$PKGCONFIG} --cflags #{pkg}`.chomp
    ldflags = `#{$PKGCONFIG} --libs #{pkg}`.chomp
    libs = `#{$PKGCONFIG} --libs-only-l #{pkg}`.chomp
    ldflags = (Shellwords.shellwords(ldflags) - Shellwords.shellwords(libs)).quote.join(" ")
    $CFLAGS += " " << cflags
    $LDFLAGS += " " << ldflags
    $libs += " " << libs
    Logging::message "package configuration for %s\n", pkg
    Logging::message "cflags: %s\nldflags: %s\nlibs: %s\n\n",
                     cflags, ldflags, libs
    [cflags, ldflags, libs]
  end
end

def with_destdir(dir)
  /^\$[\(\{]/ =~ dir ? dir : "$(DESTDIR)"+dir
end

def winsep(s)
  s.tr('/', '\\')
end

def configuration(srcdir)
  mk = []
  mk << %{
SHELL = /bin/sh

#### Start of system configuration section. ####

srcdir = #{srcdir}
topdir = #{$topdir}
hdrdir = #{$extmk ? $hdrdir : '$(topdir)'}
VPATH = #{$mingw && CONFIG['build_os'] == 'cygwin' ? '$(shell cygpath -u $(srcdir))' : '$(srcdir)'}
}
  drive = File::PATH_SEPARATOR == ';' ? /\A\w:/ : /\A/
  if destdir = CONFIG["prefix"].scan(drive)[0] and !destdir.empty?
    mk << "\nDESTDIR = #{destdir}\n"
  end
  CONFIG.each do |key, var|
    next unless /prefix$/ =~ key
    mk << "#{key} = #{with_destdir(var.sub(drive, ''))}\n"
  end
  CONFIG.each do |key, var|
    next if /^abs_/ =~ key
    next unless /^(?:src|top|(.*))dir$/ =~ key and $1
    mk << "#{key} = #{with_destdir(var.sub(drive, ''))}\n"
  end
  mk << %{
CC = #{CONFIG['CC']}
LIBRUBY = #{CONFIG['LIBRUBY']}
LIBRUBY_A = #{CONFIG['LIBRUBY_A']}
LIBRUBYARG_SHARED = #$LIBRUBYARG_SHARED
LIBRUBYARG_STATIC = #$LIBRUBYARG_STATIC

CFLAGS   = #{CONFIG['CCDLFLAGS'] unless $static} #$CFLAGS #$ARCH_FLAG
CPPFLAGS = -I. -I$(topdir) -I$(hdrdir) -I$(srcdir) #{$defs.join(" ")} #{$CPPFLAGS}
CXXFLAGS = $(CFLAGS) #{CONFIG['CXXFLAGS']}
DLDFLAGS = #$LDFLAGS #$DLDFLAGS #$ARCH_FLAG
LDSHARED = #{CONFIG['LDSHARED']}
AR = #{CONFIG['AR']}
EXEEXT = #{CONFIG['EXEEXT']}

RUBY_INSTALL_NAME = #{CONFIG['RUBY_INSTALL_NAME']}
RUBY_SO_NAME = #{CONFIG['RUBY_SO_NAME']}
arch = #{CONFIG['arch']}
sitearch = #{CONFIG['sitearch']}
ruby_version = #{Config::CONFIG['ruby_version']}
ruby = #{$ruby}
RUBY = #{($nmake && !$extmk && !$configure_args.has_key?('--ruby')) ? '$(ruby:/=\)' : '$(ruby)'}
RM = $(RUBY) -run -e rm -- -f
MAKEDIRS = $(RUBY) -run -e mkdir -- -p
INSTALL_PROG = $(RUBY) -run -e install -- -vpm 0755
INSTALL_DATA = $(RUBY) -run -e install -- -vpm 0644

#### End of system configuration section. ####

}
  if $nmake == ?b
    mk.each do |x|
      x.gsub!(/^(MAKEDIRS|INSTALL_(?:PROG|DATA))+\s*=.*\n/) do
        "!ifndef " + $1 + "\n" +
        $& +
	"!endif\n"
      end
    end
  end
  mk
end

def dummy_makefile(srcdir)
  configuration(srcdir) << "all install: Makefile\n" << CLEANINGS
end

def create_makefile(target, srcprefix = nil)
  $target = target
  libpath = $LIBPATH
  message "creating Makefile\n"
  rm_f "conftest*"
  if CONFIG["DLEXT"] == $OBJEXT
    for lib in libs = $libs.split
      lib.sub!(/-l(.*)/, %%"lib\\1.#{$LIBEXT}"%)
    end
    $defs.push(format("-DEXTLIB='%s'", libs.join(",")))
  end

  if target.include?('/')
    target_prefix, target = File.split(target)
    target_prefix[0,0] = '/'
  else
    target_prefix = ""
  end

  srcprefix ||= '$(srcdir)'
  Config::expand(srcdir = srcprefix.dup)

  unless $objs then
    $objs = []
    for f in Dir[File.join(srcdir, "*.{#{SRC_EXT.join(%q{,})}}")]
      $objs.push(File.basename(f, ".*") << "." << $OBJEXT)
    end
  else
    for i in $objs
      i.sub!(/\.o\z/, ".#{$OBJEXT}")
    end
  end
  $objs = $objs.join(" ")

  target = nil if $objs == ""

  if target and EXPORT_PREFIX
    if File.exist?(File.join(srcdir, target + '.def'))
      deffile = "$(srcdir)/$(TARGET).def"
      unless EXPORT_PREFIX.empty?
        makedef = %{-pe "sub!(/^(?=\\w)/,'#{EXPORT_PREFIX}') unless 1../^EXPORTS$/i"}
      end
    else
      makedef = %{-e "puts 'EXPORTS', '#{EXPORT_PREFIX}Init_$(TARGET)'"}
    end
    if makedef
      $distcleanfiles << '$(DEFFILE)'
      origdef = deffile
      deffile = "$(TARGET)-$(arch).def"
    end
  end

  libpath = libpathflag(libpath)

  dllib = target ? "$(TARGET).#{CONFIG['DLEXT']}" : ""
  staticlib = target ? "$(TARGET).#$LIBEXT" : ""
  mfile = open("Makefile", "wb")
  mfile.print configuration(srcdir)
  mfile.print %{
LIBPATH = #{libpath}
DEFFILE = #{deffile}

CLEANFILES = #{$cleanfiles.join(' ')}
DISTCLEANFILES = #{$distcleanfiles.join(' ')}

target_prefix = #{target_prefix}
LOCAL_LIBS = #{$LOCAL_LIBS}
LIBS = #{$LIBRUBYARG} #{$libs} #{$LIBS}
OBJS = #{$objs}
TARGET = #{target}
DLLIB = #{dllib}
STATIC_LIB = #{staticlib}
}
  if $extmk
    mfile.print %{
RUBYCOMMONDIR = $(rubylibdir)
RUBYLIBDIR    = $(rubylibdir)$(target_prefix)
RUBYARCHDIR   = $(archdir)$(target_prefix)
}
  else
    mfile.print %{
RUBYCOMMONDIR = $(sitedir)$(target_prefix)
RUBYLIBDIR    = $(sitelibdir)$(target_prefix)
RUBYARCHDIR   = $(sitearchdir)$(target_prefix)
}
  end
  mfile.print %{
CLEANLIBS     = "$(TARGET).{lib,exp,il?,tds,map}" $(DLLIB)
CLEANOBJS     = "*.{#{$OBJEXT},#{$LIBEXT},s[ol],pdb,bak}"

all:		#{target ? "$(DLLIB)" : "Makefile"}
static:		$(STATIC_LIB)
}
  mfile.print CLEANINGS
  dirs = []
  if not $static and target
    dirs << (dir = "$(RUBYARCHDIR)")
    mfile.print("install: #{dir}\n")
    f = "$(DLLIB)"
    dest = "#{dir}/#{f}"
    mfile.print "install: #{dest}\n"
    mfile.print "#{dest}: #{f} #{dir}\n\t@$(INSTALL_PROG) #{f} #{dir}\n"
  end
  for i in [[["lib/**/*.rb", "$(RUBYLIBDIR)", "lib"]], $INSTALLFILES]
    files = install_files(mfile, i, nil, srcprefix) or next
    for dir, *files in files
      unless dirs.include?(dir)
	dirs << dir
	mfile.print("install: #{dir}\n")
      end
      files.each do |f|
	dest = "#{dir}/#{File.basename(f)}"
	mfile.print("install: #{dest}\n")
	mfile.print("#{dest}: #{f} #{dir}\n\t@$(INSTALL_DATA) #{f} #{dir}\n")
      end
    end
  end
  if dirs.empty?
    mfile.print("install:\n")
  else
    dirs.each {|dir| mfile.print "#{dir}:\n\t@$(MAKEDIRS) #{dir}\n"}
  end

  mfile.print "\nsite-install: install\n\n"

  return unless target

  mfile.print ".SUFFIXES: .#{SRC_EXT.join(' .')} .#{$OBJEXT}\n"
  mfile.print "\n"

  %w[cc cpp cxx C].each do |ext|
    COMPILE_RULES.each do |rule|
      mfile.printf(rule, ext, $OBJEXT)
      mfile.printf("\n\t%s\n\n", COMPILE_CXX)
    end
  end
  %w[c].each do |ext|
    COMPILE_RULES.each do |rule|
      mfile.printf(rule, ext, $OBJEXT)
      mfile.printf("\n\t%s\n\n", COMPILE_C)
    end
  end

  if makedef
    mfile.print "$(DLLIB): $(OBJS) $(DEFFILE)\n\t"
  else
    mfile.print "$(DLLIB): $(OBJS)\n\t"
  end
  mfile.print "@-$(RM) $@\n\t"
  mfile.print "@-$(RM) $(TARGET).lib\n\t" if $mswin
  mfile.print LINK_SO, "\n\n"
  mfile.print "$(STATIC_LIB): $(OBJS)\n\t"
  mfile.print "$(AR) #{config_string('ARFLAGS') || 'cru '}$@ $(OBJS)"
  if ranlib = config_string('RANLIB')
    mfile.print "\n\t@-#{ranlib} $(DLLIB) 2> /dev/null || true"
  end
  mfile.print "\n\n"
  if makedef
    mfile.print "$(DEFFILE): #{origdef}\n"
    mfile.print "\t$(RUBY) #{makedef} #{origdef} > $@\n\n"
  end

  depend = File.join(srcdir, "depend")
  if File.exist?(depend)
    open(depend, "r") do |dfile|
      mfile.printf "###\n"
      while line = dfile.gets()
	line.gsub!(/\.o\b/, ".#{$OBJEXT}")
	line.gsub!(/(\s)([^\s\/]+\.[ch])/, '\1{$(srcdir)}\2') if $nmake
	line.gsub!(/\$\(hdrdir\)\/config.h/, $config_h) if $config_h
	mfile.print line
      end
    end
  end
ensure
  mfile.close if mfile
end

def init_mkmf(config = CONFIG)
  $enable_shared = config['ENABLE_SHARED'] == 'yes'
  $defs = []
  $CFLAGS = with_config("cflags", arg_config("CFLAGS", config["CFLAGS"])).dup
  $ARCH_FLAG = with_config("arch_flag", arg_config("ARCH_FLAG", config["ARCH_FLAG"])).dup
  $CPPFLAGS = with_config("cppflags", arg_config("CPPFLAGS", config["CPPFLAGS"])).dup
  $LDFLAGS = (with_config("ldflags") || "").dup
  $INCFLAGS = "-I$(topdir)"
  $DLDFLAGS = with_config("dldflags", arg_config("DLDFLAGS", config["DLDFLAGS"])).dup
  $LIBEXT = config['LIBEXT'].dup
  $OBJEXT = config["OBJEXT"].dup
  $LIBS = "#{config['LIBS']} #{config['DLDLIBS']}"
  $LIBRUBYARG = ""
  $LIBRUBYARG_STATIC = config['LIBRUBYARG_STATIC']
  $LIBRUBYARG_SHARED = config['LIBRUBYARG_SHARED']
  $LIBPATH = $extmk ? ["$(topdir)"] : CROSS_COMPILING ? [] : ["$(libdir)"]
  $INSTALLFILES = nil

  $objs = nil
  $libs = ""
  if $enable_shared or Config.expand(config["LIBRUBY"].dup) != Config.expand(config["LIBRUBY_A"].dup)
    $LIBRUBYARG = config['LIBRUBYARG']
  end

  $LOCAL_LIBS = ""

  $cleanfiles = []
  $distcleanfiles = []

  dir_config("opt")
end

init_mkmf

$make = with_config("make-prog", ENV["MAKE"] || "make")
make, = Shellwords.shellwords($make)
$nmake = nil
case
when $mswin
  $nmake = ?m if /nmake/i =~ make
when $bccwin
  $nmake = ?b if /Borland/i =~ `#{make} -h`
end

Config::CONFIG["srcdir"] = CONFIG["srcdir"] =
  $srcdir = arg_config("--srcdir", File.dirname($0))
$configure_args["--topsrcdir"] ||= $srcdir
Config::CONFIG["topdir"] = CONFIG["topdir"] =
  $curdir = arg_config("--curdir", Dir.pwd)
$configure_args["--topdir"] ||= $curdir
$ruby = arg_config("--ruby", File.join(Config::CONFIG["bindir"], CONFIG["ruby_install_name"]))

split = Shellwords.method(:shellwords).to_proc

EXPORT_PREFIX = config_string('EXPORT_PREFIX') {|s| s.strip}

hdr = []
config_string('COMMON_MACROS') do |s|
  Shellwords.shellwords(s).each do |s|
    /(.*?)(?:=(.*))/ =~ s
    hdr << "#define #$1 #$2"
  end
end
config_string('COMMON_HEADERS') do |s|
  Shellwords.shellwords(s).each {|s| hdr << "#include <#{s}>"}
end
COMMON_HEADERS = (hdr.join("\n") unless hdr.empty?)
COMMON_LIBS = config_string('COMMON_LIBS', &split) || []

COMPILE_RULES = config_string('COMPILE_RULES', &split) || %w[.%s.%s:]
COMPILE_C = config_string('COMPILE_C') || '$(CC) $(CFLAGS) $(CPPFLAGS) -c $<'
COMPILE_CXX = config_string('COMPILE_CXX') || '$(CXX) $(CXXFLAGS) $(CPPFLAGS) -c $<'
TRY_LINK = config_string('TRY_LINK') ||
  "$(CC) #{OUTFLAG}conftest $(INCFLAGS) -I$(hdrdir) $(CPPFLAGS) " \
  "$(CFLAGS) $(src) $(LIBPATH) $(LDFLAGS) $(ARCH_FLAG) $(LOCAL_LIBS) $(LIBS)"
LINK_SO = config_string('LINK_SO') ||
  if CONFIG["DLEXT"] == $OBJEXT
    "ld $(DLDFLAGS) -r -o $(DLLIB) $(OBJS)\n"
  else
    "$(LDSHARED) $(DLDFLAGS) $(LIBPATH) #{OUTFLAG}$(DLLIB) " \
    "$(OBJS) $(LOCAL_LIBS) $(LIBS)"
  end
LIBPATHFLAG = config_string('LIBPATHFLAG') || ' -L"%s"'
RPATHFLAG = config_string('RPATHFLAG') || ''
LIBARG = config_string('LIBARG') || '-l%s'

CLEANINGS = "
clean:
		@$(RM) $(CLEANLIBS) $(CLEANOBJS) $(CLEANFILES)

distclean:	clean
		@$(RM) Makefile extconf.h conftest.* mkmf.log
		@$(RM) core ruby$(EXEEXT) *~ $(DISTCLEANFILES)

realclean:	distclean
"