configure.py

   1 #!/usr/bin/env python
   2 #
   3 # Copyright 2001 Google Inc. All Rights Reserved.
   4 #
   5 # Licensed under the Apache License, Version 2.0 (the "License");
   6 # you may not use this file except in compliance with the License.
   7 # You may obtain a copy of the License at
   8 #
   9 #     http://www.apache.org/licenses/LICENSE-2.0
  10 #
  11 # Unless required by applicable law or agreed to in writing, software
  12 # distributed under the License is distributed on an "AS IS" BASIS,
  13 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14 # See the License for the specific language governing permissions and
  15 # limitations under the License.
  16
  17 """Script that generates the build.ninja for ninja itself.
  18
  19 Projects that use ninja themselves should either write a similar script
  20 or use a meta-build system that supports Ninja output."""
  21
  22 from __future__ import print_function
  23
  24 from optparse import OptionParser
  25 import os
  26 import pipes
  27 import string
  28 import subprocess
  29 import sys
  30
  31 sourcedir = os.path.dirname(os.path.realpath(__file__))
  32 sys.path.insert(0, os.path.join(sourcedir, 'misc'))
  33 import ninja_syntax
  34
  35
  36 class Platform(object):
  37     """Represents a host/target platform and its specific build attributes."""
  38     def __init__(self, platform):
  39         self._platform = platform
  40         if self._platform is not None:
  41             return
  42         self._platform = sys.platform
  43         if self._platform.startswith('linux'):
  44             self._platform = 'linux'
  45         elif self._platform.startswith('freebsd'):
  46             self._platform = 'freebsd'
  47         elif self._platform.startswith('gnukfreebsd'):
  48             self._platform = 'freebsd'
  49         elif self._platform.startswith('openbsd'):
  50             self._platform = 'openbsd'
  51         elif self._platform.startswith('solaris') or self._platform == 'sunos5':
  52             self._platform = 'solaris'
  53         elif self._platform.startswith('mingw'):
  54             self._platform = 'mingw'
  55         elif self._platform.startswith('win'):
  56             self._platform = 'msvc'
  57         elif self._platform.startswith('bitrig'):
  58             self._platform = 'bitrig'
  59         elif self._platform.startswith('netbsd'):
  60             self._platform = 'netbsd'
  61         elif self._platform.startswith('aix'):
  62             self._platform = 'aix'
  63
  64     @staticmethod
  65     def known_platforms():
  66       return ['linux', 'darwin', 'freebsd', 'openbsd', 'solaris', 'sunos5',
  67               'mingw', 'msvc', 'gnukfreebsd', 'bitrig', 'netbsd', 'aix']
  68
  69     def platform(self):
  70         return self._platform
  71
  72     def is_linux(self):
  73         return self._platform == 'linux'
  74
  75     def is_mingw(self):
  76         return self._platform == 'mingw'
  77
  78     def is_msvc(self):
  79         return self._platform == 'msvc'
  80
  81     def msvc_needs_fs(self):
  82         popen = subprocess.Popen(['cl', '/nologo', '/?'],
  83                                  stdout=subprocess.PIPE,
  84                                  stderr=subprocess.PIPE)
  85         out, err = popen.communicate()
  86         return b'/FS ' in out
  87
  88     def is_windows(self):
  89         return self.is_mingw() or self.is_msvc()
  90
  91     def is_solaris(self):
  92         return self._platform == 'solaris'
  93
  94     def is_aix(self):
  95         return self._platform == 'aix'
  96
  97     def uses_usr_local(self):
  98         return self._platform in ('freebsd', 'openbsd', 'bitrig')
  99
 100     def supports_ppoll(self):
 101         return self._platform in ('linux', 'openbsd', 'bitrig')
 102
 103     def supports_ninja_browse(self):
 104         return (not self.is_windows()
 105                 and not self.is_solaris()
 106                 and not self.is_aix())
 107
 108     def can_rebuild_in_place(self):
 109         return not (self.is_windows() or self.is_aix())
 110
 111 class Bootstrap:
 112     """API shim for ninja_syntax.Writer that instead runs the commands.
 113
 114     Used to bootstrap Ninja from scratch.  In --bootstrap mode this
 115     class is used to execute all the commands to build an executable.
 116     It also proxies all calls to an underlying ninja_syntax.Writer, to
 117     behave like non-bootstrap mode.
 118     """
 119     def __init__(self, writer, verbose=False):
 120         self.writer = writer
 121         self.verbose = verbose
 122         # Map of variable name => expanded variable value.
 123         self.vars = {}
 124         # Map of rule name => dict of rule attributes.
 125         self.rules = {
 126             'phony': {}
 127         }
 128
 129     def comment(self, text):
 130         return self.writer.comment(text)
 131
 132     def newline(self):
 133         return self.writer.newline()
 134
 135     def variable(self, key, val):
 136         self.vars[key] = self._expand(val)
 137         return self.writer.variable(key, val)
 138
 139     def rule(self, name, **kwargs):
 140         self.rules[name] = kwargs
 141         return self.writer.rule(name, **kwargs)
 142
 143     def build(self, outputs, rule, inputs=None, **kwargs):
 144         ruleattr = self.rules[rule]
 145         cmd = ruleattr.get('command')
 146         if cmd is None:  # A phony rule, for example.
 147             return
 148
 149         # Implement just enough of Ninja variable expansion etc. to
 150         # make the bootstrap build work.
 151         local_vars = {
 152             'in': self._expand_paths(inputs),
 153             'out': self._expand_paths(outputs)
 154         }
 155         for key, val in kwargs.get('variables', []):
 156             local_vars[key] = ' '.join(ninja_syntax.as_list(val))
 157
 158         self._run_command(self._expand(cmd, local_vars))
 159
 160         return self.writer.build(outputs, rule, inputs, **kwargs)
 161
 162     def default(self, paths):
 163         return self.writer.default(paths)
 164
 165     def _expand_paths(self, paths):
 166         """Expand $vars in an array of paths, e.g. from a 'build' block."""
 167         paths = ninja_syntax.as_list(paths)
 168         return ' '.join(map(self._shell_escape, (map(self._expand, paths))))
 169
 170     def _expand(self, str, local_vars={}):
 171         """Expand $vars in a string."""
 172         return ninja_syntax.expand(str, self.vars, local_vars)
 173
 174     def _shell_escape(self, path):
 175         """Quote paths containing spaces."""
 176         return '"%s"' % path if ' ' in path else path
 177
 178     def _run_command(self, cmdline):
 179         """Run a subcommand, quietly.  Prints the full command on error."""
 180         try:
 181             if self.verbose:
 182                 print(cmdline)
 183             subprocess.check_call(cmdline, shell=True)
 184         except subprocess.CalledProcessError:
 185             print('when running: ', cmdline)
 186             raise
 187
 188
 189 parser = OptionParser()
 190 profilers = ['gmon', 'pprof']
 191 parser.add_option('--bootstrap', action='store_true',
 192                   help='bootstrap a ninja binary from nothing')
 193 parser.add_option('--verbose', action='store_true',
 194                   help='enable verbose build')
 195 parser.add_option('--platform',
 196                   help='target platform (' +
 197                        '/'.join(Platform.known_platforms()) + ')',
 198                   choices=Platform.known_platforms())
 199 parser.add_option('--host',
 200                   help='host platform (' +
 201                        '/'.join(Platform.known_platforms()) + ')',
 202                   choices=Platform.known_platforms())
 203 parser.add_option('--debug', action='store_true',
 204                   help='enable debugging extras',)
 205 parser.add_option('--profile', metavar='TYPE',
 206                   choices=profilers,
 207                   help='enable profiling (' + '/'.join(profilers) + ')',)
 208 parser.add_option('--with-gtest', metavar='PATH', help='ignored')
 209 parser.add_option('--with-python', metavar='EXE',
 210                   help='use EXE as the Python interpreter',
 211                   default=os.path.basename(sys.executable))
 212 parser.add_option('--force-pselect', action='store_true',
 213                   help='ppoll() is used by default where available, '
 214                        'but some platforms may need to use pselect instead',)
 215 (options, args) = parser.parse_args()
 216 if args:
 217     print('ERROR: extra unparsed command-line arguments:', args)
 218     sys.exit(1)
 219
 220 platform = Platform(options.platform)
 221 if options.host:
 222     host = Platform(options.host)
 223 else:
 224     host = platform
 225
 226 BUILD_FILENAME = 'build.ninja'
 227 ninja_writer = ninja_syntax.Writer(open(BUILD_FILENAME, 'w'))
 228 n = ninja_writer
 229
 230 if options.bootstrap:
 231     # Make the build directory.
 232     try:
 233         os.mkdir('build')
 234     except OSError:
 235         pass
 236     # Wrap ninja_writer with the Bootstrapper, which also executes the
 237     # commands.
 238     print('bootstrapping ninja...')
 239     n = Bootstrap(n, verbose=options.verbose)
 240
 241 n.comment('This file is used to build ninja itself.')
 242 n.comment('It is generated by ' + os.path.basename(__file__) + '.')
 243 n.newline()
 244
 245 n.variable('ninja_required_version', '1.3')
 246 n.newline()
 247
 248 n.comment('The arguments passed to configure.py, for rerunning it.')
 249 configure_args = sys.argv[1:]
 250 if '--bootstrap' in configure_args:
 251     configure_args.remove('--bootstrap')
 252 n.variable('configure_args', ' '.join(configure_args))
 253 env_keys = set(['CXX', 'AR', 'CFLAGS', 'LDFLAGS'])
 254 configure_env = dict((k, os.environ[k]) for k in os.environ if k in env_keys)
 255 if configure_env:
 256     config_str = ' '.join([k + '=' + pipes.quote(configure_env[k])
 257                            for k in configure_env])
 258     n.variable('configure_env', config_str + '$ ')
 259 n.newline()
 260
 261 CXX = configure_env.get('CXX', 'g++')
 262 objext = '.o'
 263 if platform.is_msvc():
 264     CXX = 'cl'
 265     objext = '.obj'
 266
 267 def src(filename):
 268     return os.path.join('$sourcedir', 'src', filename)
 269 def built(filename):
 270     return os.path.join('$builddir', filename)
 271 def doc(filename):
 272     return os.path.join('$sourcedir', 'doc', filename)
 273 def cc(name, **kwargs):
 274     return n.build(built(name + objext), 'cxx', src(name + '.c'), **kwargs)
 275 def cxx(name, **kwargs):
 276     return n.build(built(name + objext), 'cxx', src(name + '.cc'), **kwargs)
 277 def binary(name):
 278     if platform.is_windows():
 279         exe = name + '.exe'
 280         n.build(name, 'phony', exe)
 281         return exe
 282     return name
 283
 284 n.variable('sourcedir', sourcedir)
 285 n.variable('builddir', 'build')
 286 n.variable('cxx', CXX)
 287 if platform.is_msvc():
 288     n.variable('ar', 'link')
 289 else:
 290     n.variable('ar', configure_env.get('AR', 'ar'))
 291
 292 if platform.is_msvc():
 293     cflags = ['/showIncludes',
 294               '/nologo',  # Don't print startup banner.
 295               '/Zi',  # Create pdb with debug info.
 296               '/W4',  # Highest warning level.
 297               '/WX',  # Warnings as errors.
 298               '/wd4530', '/wd4100', '/wd4706',
 299               '/wd4512', '/wd4800', '/wd4702', '/wd4819',
 300               # Disable warnings about passing "this" during initialization.
 301               '/wd4355',
 302               # Disable warnings about ignored typedef in DbgHelp.h
 303               '/wd4091',
 304               '/GR-',  # Disable RTTI.
 305               # Disable size_t -> int truncation warning.
 306               # We never have strings or arrays larger than 2**31.
 307               '/wd4267',
 308               '/DNOMINMAX', '/D_CRT_SECURE_NO_WARNINGS',
 309               '/D_HAS_EXCEPTIONS=0',
 310               '/DNINJA_PYTHON="%s"' % options.with_python]
 311     if options.bootstrap:
 312         # In bootstrap mode, we have no ninja process to catch /showIncludes
 313         # output.
 314         cflags.remove('/showIncludes')
 315     if platform.msvc_needs_fs():
 316         cflags.append('/FS')
 317     ldflags = ['/DEBUG', '/libpath:$builddir']
 318     if not options.debug:
 319         cflags += ['/Ox', '/DNDEBUG', '/GL']
 320         ldflags += ['/LTCG', '/OPT:REF', '/OPT:ICF']
 321 else:
 322     cflags = ['-g', '-Wall', '-Wextra',
 323               '-Wno-deprecated',
 324               '-Wno-unused-parameter',
 325               '-fno-rtti',
 326               '-fno-exceptions',
 327               '-fvisibility=hidden', '-pipe',
 328               '-Wno-missing-field-initializers',
 329               '-DNINJA_PYTHON="%s"' % options.with_python]
 330     if options.debug:
 331         cflags += ['-D_GLIBCXX_DEBUG', '-D_GLIBCXX_DEBUG_PEDANTIC']
 332         cflags.remove('-fno-rtti')  # Needed for above pedanticness.
 333     else:
 334         cflags += ['-O2', '-DNDEBUG']
 335     try:
 336         proc = subprocess.Popen(
 337             [CXX, '-fdiagnostics-color', '-c', '-x', 'c++', '/dev/null',
 338              '-o', '/dev/null'],
 339             stdout=open(os.devnull, 'wb'), stderr=subprocess.STDOUT)
 340         if proc.wait() == 0:
 341             cflags += ['-fdiagnostics-color']
 342     except:
 343         pass
 344     if platform.is_mingw():
 345         cflags += ['-D_WIN32_WINNT=0x0501']
 346     ldflags = ['-L$builddir']
 347     if platform.uses_usr_local():
 348         cflags.append('-I/usr/local/include')
 349         ldflags.append('-L/usr/local/lib')
 350
 351 libs = []
 352
 353 if platform.is_mingw():
 354     cflags.remove('-fvisibility=hidden');
 355     ldflags.append('-static')
 356 elif platform.is_solaris():
 357     cflags.remove('-fvisibility=hidden')
 358 elif platform.is_aix():
 359     cflags.remove('-fvisibility=hidden')
 360 elif platform.is_msvc():
 361     pass
 362 else:
 363     if options.profile == 'gmon':
 364         cflags.append('-pg')
 365         ldflags.append('-pg')
 366     elif options.profile == 'pprof':
 367         cflags.append('-fno-omit-frame-pointer')
 368         libs.extend(['-Wl,--no-as-needed', '-lprofiler'])
 369
 370 if platform.supports_ppoll() and not options.force_pselect:
 371     cflags.append('-DUSE_PPOLL')
 372 if platform.supports_ninja_browse():
 373     cflags.append('-DNINJA_HAVE_BROWSE')
 374
 375 # Search for generated headers relative to build dir.
 376 cflags.append('-I.')
 377
 378 def shell_escape(str):
 379     """Escape str such that it's interpreted as a single argument by
 380     the shell."""
 381
 382     # This isn't complete, but it's just enough to make NINJA_PYTHON work.
 383     if platform.is_windows():
 384       return str
 385     if '"' in str:
 386         return "'%s'" % str.replace("'", "\\'")
 387     return str
 388
 389 if 'CFLAGS' in configure_env:
 390     cflags.append(configure_env['CFLAGS'])
 391 n.variable('cflags', ' '.join(shell_escape(flag) for flag in cflags))
 392 if 'LDFLAGS' in configure_env:
 393     ldflags.append(configure_env['LDFLAGS'])
 394 n.variable('ldflags', ' '.join(shell_escape(flag) for flag in ldflags))
 395 n.newline()
 396
 397 if platform.is_msvc():
 398     n.rule('cxx',
 399         command='$cxx $cflags -c $in /Fo$out',
 400         description='CXX $out',
 401         deps='msvc'  # /showIncludes is included in $cflags.
 402     )
 403 else:
 404     n.rule('cxx',
 405         command='$cxx -MMD -MT $out -MF $out.d $cflags -c $in -o $out',
 406         depfile='$out.d',
 407         deps='gcc',
 408         description='CXX $out')
 409 n.newline()
 410
 411 if host.is_msvc():
 412     n.rule('ar',
 413            command='lib /nologo /ltcg /out:$out $in',
 414            description='LIB $out')
 415 elif host.is_mingw():
 416     n.rule('ar',
 417            command='cmd /c $ar cqs $out.tmp $in && move /Y $out.tmp $out',
 418            description='AR $out')
 419 else:
 420     n.rule('ar',
 421            command='rm -f $out && $ar crs $out $in',
 422            description='AR $out')
 423 n.newline()
 424
 425 if platform.is_msvc():
 426     n.rule('link',
 427         command='$cxx $in $libs /nologo /link $ldflags /out:$out',
 428         description='LINK $out')
 429 else:
 430     n.rule('link',
 431         command='$cxx $ldflags -o $out $in $libs',
 432         description='LINK $out')
 433 n.newline()
 434
 435 objs = []
 436
 437 if platform.supports_ninja_browse():
 438     n.comment('browse_py.h is used to inline browse.py.')
 439     n.rule('inline',
 440            command='"%s"' % src('inline.sh') + ' $varname < $in > $out',
 441            description='INLINE $out')
 442     n.build(built('browse_py.h'), 'inline', src('browse.py'),
 443             implicit=src('inline.sh'),
 444             variables=[('varname', 'kBrowsePy')])
 445     n.newline()
 446
 447     objs += cxx('browse', order_only=built('browse_py.h'))
 448     n.newline()
 449
 450 n.comment('the depfile parser and ninja lexers are generated using re2c.')
 451 def has_re2c():
 452     try:
 453         proc = subprocess.Popen(['re2c', '-V'], stdout=subprocess.PIPE)
 454         return int(proc.communicate()[0], 10) >= 1103
 455     except OSError:
 456         return False
 457 if has_re2c():
 458     n.rule('re2c',
 459            command='re2c -b -i --no-generation-date -o $out $in',
 460            description='RE2C $out')
 461     # Generate the .cc files in the source directory so we can check them in.
 462     n.build(src('depfile_parser.cc'), 're2c', src('depfile_parser.in.cc'))
 463     n.build(src('lexer.cc'), 're2c', src('lexer.in.cc'))
 464 else:
 465     print("warning: A compatible version of re2c (>= 0.11.3) was not found; "
 466            "changes to src/*.in.cc will not affect your build.")
 467 n.newline()
 468
 469 n.comment('Core source files all build into ninja library.')
 470 for name in ['build',
 471              'build_log',
 472              'clean',
 473              'debug_flags',
 474              'depfile_parser',
 475              'deps_log',
 476              'disk_interface',
 477              'edit_distance',
 478              'eval_env',
 479              'graph',
 480              'graphviz',
 481              'lexer',
 482              'line_printer',
 483              'manifest_parser',
 484              'metrics',
 485              'state',
 486              'util',
 487              'version']:
 488     objs += cxx(name)
 489 if platform.is_windows():
 490     for name in ['subprocess-win32',
 491                  'includes_normalize-win32',
 492                  'msvc_helper-win32',
 493                  'msvc_helper_main-win32']:
 494         objs += cxx(name)
 495     if platform.is_msvc():
 496         objs += cxx('minidump-win32')
 497     objs += cc('getopt')
 498 else:
 499     objs += cxx('subprocess-posix')
 500 if platform.is_aix():
 501     objs += cc('getopt')
 502 if platform.is_msvc():
 503     ninja_lib = n.build(built('ninja.lib'), 'ar', objs)
 504 else:
 505     ninja_lib = n.build(built('libninja.a'), 'ar', objs)
 506 n.newline()
 507
 508 if platform.is_msvc():
 509     libs.append('ninja.lib')
 510 else:
 511     libs.append('-lninja')
 512
 513 if platform.is_aix():
 514     libs.append('-lperfstat')
 515
 516 all_targets = []
 517
 518 n.comment('Main executable is library plus main() function.')
 519 objs = cxx('ninja')
 520 ninja = n.build(binary('ninja'), 'link', objs, implicit=ninja_lib,
 521                 variables=[('libs', libs)])
 522 n.newline()
 523 all_targets += ninja
 524
 525 if options.bootstrap:
 526     # We've built the ninja binary.  Don't run any more commands
 527     # through the bootstrap executor, but continue writing the
 528     # build.ninja file.
 529     n = ninja_writer
 530
 531 n.comment('Tests all build into ninja_test executable.')
 532
 533 objs = []
 534
 535 for name in ['build_log_test',
 536              'build_test',
 537              'clean_test',
 538              'depfile_parser_test',
 539              'deps_log_test',
 540              'disk_interface_test',
 541              'edit_distance_test',
 542              'graph_test',
 543              'lexer_test',
 544              'manifest_parser_test',
 545              'ninja_test',
 546              'state_test',
 547              'subprocess_test',
 548              'test',
 549              'util_test']:
 550     objs += cxx(name)
 551 if platform.is_windows():
 552     for name in ['includes_normalize_test', 'msvc_helper_test']:
 553         objs += cxx(name)
 554
 555 ninja_test = n.build(binary('ninja_test'), 'link', objs, implicit=ninja_lib,
 556                      variables=[('libs', libs)])
 557 n.newline()
 558 all_targets += ninja_test
 559
 560
 561 n.comment('Ancillary executables.')
 562 objs = cxx('build_log_perftest')
 563 all_targets += n.build(binary('build_log_perftest'), 'link', objs,
 564                        implicit=ninja_lib, variables=[('libs', libs)])
 565 objs = cxx('canon_perftest')
 566 all_targets += n.build(binary('canon_perftest'), 'link', objs,
 567                        implicit=ninja_lib, variables=[('libs', libs)])
 568 objs = cxx('depfile_parser_perftest')
 569 all_targets += n.build(binary('depfile_parser_perftest'), 'link', objs,
 570                        implicit=ninja_lib, variables=[('libs', libs)])
 571 objs = cxx('hash_collision_bench')
 572 all_targets += n.build(binary('hash_collision_bench'), 'link', objs,
 573                               implicit=ninja_lib, variables=[('libs', libs)])
 574 objs = cxx('manifest_parser_perftest')
 575 all_targets += n.build(binary('manifest_parser_perftest'), 'link', objs,
 576                               implicit=ninja_lib, variables=[('libs', libs)])
 577 n.newline()
 578
 579 n.comment('Generate a graph using the "graph" tool.')
 580 n.rule('gendot',
 581        command='./ninja -t graph all > $out')
 582 n.rule('gengraph',
 583        command='dot -Tpng $in > $out')
 584 dot = n.build(built('graph.dot'), 'gendot', ['ninja', 'build.ninja'])
 585 n.build('graph.png', 'gengraph', dot)
 586 n.newline()
 587
 588 n.comment('Generate the manual using asciidoc.')
 589 n.rule('asciidoc',
 590        command='asciidoc -b docbook -d book -o $out $in',
 591        description='ASCIIDOC $out')
 592 n.rule('xsltproc',
 593        command='xsltproc --nonet doc/docbook.xsl $in > $out',
 594        description='XSLTPROC $out')
 595 xml = n.build(built('manual.xml'), 'asciidoc', doc('manual.asciidoc'))
 596 manual = n.build(doc('manual.html'), 'xsltproc', xml,
 597                  implicit=doc('style.css'))
 598 n.build('manual', 'phony',
 599         order_only=manual)
 600 n.newline()
 601
 602 n.comment('Generate Doxygen.')
 603 n.rule('doxygen',
 604        command='doxygen $in',
 605        description='DOXYGEN $in')
 606 n.variable('doxygen_mainpage_generator',
 607            src('gen_doxygen_mainpage.sh'))
 608 n.rule('doxygen_mainpage',
 609        command='$doxygen_mainpage_generator $in > $out',
 610        description='DOXYGEN_MAINPAGE $out')
 611 mainpage = n.build(built('doxygen_mainpage'), 'doxygen_mainpage',
 612                    ['README', 'COPYING'],
 613                    implicit=['$doxygen_mainpage_generator'])
 614 n.build('doxygen', 'doxygen', doc('doxygen.config'),
 615         implicit=mainpage)
 616 n.newline()
 617
 618 if not host.is_mingw():
 619     n.comment('Regenerate build files if build script changes.')
 620     n.rule('configure',
 621            command='${configure_env}%s $sourcedir/configure.py $configure_args' %
 622                options.with_python,
 623            generator=True)
 624     n.build('build.ninja', 'configure',
 625             implicit=['$sourcedir/configure.py',
 626                       os.path.normpath('$sourcedir/misc/ninja_syntax.py')])
 627     n.newline()
 628
 629 n.default(ninja)
 630 n.newline()
 631
 632 if host.is_linux():
 633     n.comment('Packaging')
 634     n.rule('rpmbuild',
 635            command="misc/packaging/rpmbuild.sh",
 636            description='Building rpms..')
 637     n.build('rpm', 'rpmbuild')
 638     n.newline()
 639
 640 n.build('all', 'phony', all_targets)
 641
 642 n.close()
 643 print('wrote %s.' % BUILD_FILENAME)
 644
 645 if options.bootstrap:
 646     print('bootstrap complete.  rebuilding...')
 647
 648     rebuild_args = []
 649
 650     if platform.can_rebuild_in_place():
 651         rebuild_args.append('./ninja')
 652     else:
 653         if platform.is_windows():
 654             bootstrap_exe = 'ninja.bootstrap.exe'
 655             final_exe = 'ninja.exe'
 656         else:
 657             bootstrap_exe = './ninja.bootstrap'
 658             final_exe = './ninja'
 659
 660         if os.path.exists(bootstrap_exe):
 661             os.unlink(bootstrap_exe)
 662         os.rename(final_exe, bootstrap_exe)
 663
 664         rebuild_args.append(bootstrap_exe)
 665
 666     if options.verbose:
 667         rebuild_args.append('-v')
 668
 669     subprocess.check_call(rebuild_args)