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         # In bootstrap mode, we have no ninja process to catch /showIncludes
 137         # output.
 138         self.vars[key] = self._expand(val).replace('/showIncludes', '')
 139         return self.writer.variable(key, val)
 140
 141     def rule(self, name, **kwargs):
 142         self.rules[name] = kwargs
 143         return self.writer.rule(name, **kwargs)
 144
 145     def build(self, outputs, rule, inputs=None, **kwargs):
 146         ruleattr = self.rules[rule]
 147         cmd = ruleattr.get('command')
 148         if cmd is None:  # A phony rule, for example.
 149             return
 150
 151         # Implement just enough of Ninja variable expansion etc. to
 152         # make the bootstrap build work.
 153         local_vars = {
 154             'in': self._expand_paths(inputs),
 155             'out': self._expand_paths(outputs)
 156         }
 157         for key, val in kwargs.get('variables', []):
 158             local_vars[key] = ' '.join(ninja_syntax.as_list(val))
 159
 160         self._run_command(self._expand(cmd, local_vars))
 161
 162         return self.writer.build(outputs, rule, inputs, **kwargs)
 163
 164     def default(self, paths):
 165         return self.writer.default(paths)
 166
 167     def _expand_paths(self, paths):
 168         """Expand $vars in an array of paths, e.g. from a 'build' block."""
 169         paths = ninja_syntax.as_list(paths)
 170         return ' '.join(map(self._shell_escape, (map(self._expand, paths))))
 171
 172     def _expand(self, str, local_vars={}):
 173         """Expand $vars in a string."""
 174         return ninja_syntax.expand(str, self.vars, local_vars)
 175
 176     def _shell_escape(self, path):
 177         """Quote paths containing spaces."""
 178         return '"%s"' % path if ' ' in path else path
 179
 180     def _run_command(self, cmdline):
 181         """Run a subcommand, quietly.  Prints the full command on error."""
 182         try:
 183             if self.verbose:
 184                 print(cmdline)
 185             subprocess.check_call(cmdline, shell=True)
 186         except subprocess.CalledProcessError:
 187             print('when running: ', cmdline)
 188             raise
 189
 190
 191 parser = OptionParser()
 192 profilers = ['gmon', 'pprof']
 193 parser.add_option('--bootstrap', action='store_true',
 194                   help='bootstrap a ninja binary from nothing')
 195 parser.add_option('--verbose', action='store_true',
 196                   help='enable verbose build')
 197 parser.add_option('--platform',
 198                   help='target platform (' +
 199                        '/'.join(Platform.known_platforms()) + ')',
 200                   choices=Platform.known_platforms())
 201 parser.add_option('--host',
 202                   help='host platform (' +
 203                        '/'.join(Platform.known_platforms()) + ')',
 204                   choices=Platform.known_platforms())
 205 parser.add_option('--debug', action='store_true',
 206                   help='enable debugging extras',)
 207 parser.add_option('--profile', metavar='TYPE',
 208                   choices=profilers,
 209                   help='enable profiling (' + '/'.join(profilers) + ')',)
 210 parser.add_option('--with-gtest', metavar='PATH', help='ignored')
 211 parser.add_option('--with-python', metavar='EXE',
 212                   help='use EXE as the Python interpreter',
 213                   default=os.path.basename(sys.executable))
 214 parser.add_option('--force-pselect', action='store_true',
 215                   help='ppoll() is used by default where available, '
 216                        'but some platforms may need to use pselect instead',)
 217 (options, args) = parser.parse_args()
 218 if args:
 219     print('ERROR: extra unparsed command-line arguments:', args)
 220     sys.exit(1)
 221
 222 platform = Platform(options.platform)
 223 if options.host:
 224     host = Platform(options.host)
 225 else:
 226     host = platform
 227
 228 BUILD_FILENAME = 'build.ninja'
 229 ninja_writer = ninja_syntax.Writer(open(BUILD_FILENAME, 'w'))
 230 n = ninja_writer
 231
 232 if options.bootstrap:
 233     # Make the build directory.
 234     try:
 235         os.mkdir('build')
 236     except OSError:
 237         pass
 238     # Wrap ninja_writer with the Bootstrapper, which also executes the
 239     # commands.
 240     print('bootstrapping ninja...')
 241     n = Bootstrap(n, verbose=options.verbose)
 242
 243 n.comment('This file is used to build ninja itself.')
 244 n.comment('It is generated by ' + os.path.basename(__file__) + '.')
 245 n.newline()
 246
 247 n.variable('ninja_required_version', '1.3')
 248 n.newline()
 249
 250 n.comment('The arguments passed to configure.py, for rerunning it.')
 251 configure_args = sys.argv[1:]
 252 if '--bootstrap' in configure_args:
 253     configure_args.remove('--bootstrap')
 254 n.variable('configure_args', ' '.join(configure_args))
 255 env_keys = set(['CXX', 'AR', 'CFLAGS', 'LDFLAGS'])
 256 configure_env = dict((k, os.environ[k]) for k in os.environ if k in env_keys)
 257 if configure_env:
 258     config_str = ' '.join([k + '=' + pipes.quote(configure_env[k])
 259                            for k in configure_env])
 260     n.variable('configure_env', config_str + '$ ')
 261 n.newline()
 262
 263 CXX = configure_env.get('CXX', 'g++')
 264 objext = '.o'
 265 if platform.is_msvc():
 266     CXX = 'cl'
 267     objext = '.obj'
 268
 269 def src(filename):
 270     return os.path.join('$root', 'src', filename)
 271 def built(filename):
 272     return os.path.join('$builddir', filename)
 273 def doc(filename):
 274     return os.path.join('$root', 'doc', filename)
 275 def cc(name, **kwargs):
 276     return n.build(built(name + objext), 'cxx', src(name + '.c'), **kwargs)
 277 def cxx(name, **kwargs):
 278     return n.build(built(name + objext), 'cxx', src(name + '.cc'), **kwargs)
 279 def binary(name):
 280     if platform.is_windows():
 281         exe = name + '.exe'
 282         n.build(name, 'phony', exe)
 283         return exe
 284     return name
 285
 286 root = sourcedir
 287 if root == os.getcwd():
 288     # In the common case where we're building directly in the source
 289     # tree, simplify all the paths to just be cwd-relative.
 290     root = '.'
 291 n.variable('root', root)
 292 n.variable('builddir', 'build')
 293 n.variable('cxx', CXX)
 294 if platform.is_msvc():
 295     n.variable('ar', 'link')
 296 else:
 297     n.variable('ar', configure_env.get('AR', 'ar'))
 298
 299 if platform.is_msvc():
 300     cflags = ['/showIncludes',
 301               '/nologo',  # Don't print startup banner.
 302               '/Zi',  # Create pdb with debug info.
 303               '/W4',  # Highest warning level.
 304               '/WX',  # Warnings as errors.
 305               '/wd4530', '/wd4100', '/wd4706',
 306               '/wd4512', '/wd4800', '/wd4702', '/wd4819',
 307               # Disable warnings about constant conditional expressions.
 308               '/wd4127',
 309               # Disable warnings about passing "this" during initialization.
 310               '/wd4355',
 311               # Disable warnings about ignored typedef in DbgHelp.h
 312               '/wd4091',
 313               '/GR-',  # Disable RTTI.
 314               # Disable size_t -> int truncation warning.
 315               # We never have strings or arrays larger than 2**31.
 316               '/wd4267',
 317               '/DNOMINMAX', '/D_CRT_SECURE_NO_WARNINGS',
 318               '/D_HAS_EXCEPTIONS=0',
 319               '/DNINJA_PYTHON="%s"' % options.with_python]
 320     if platform.msvc_needs_fs():
 321         cflags.append('/FS')
 322     ldflags = ['/DEBUG', '/libpath:$builddir']
 323     if not options.debug:
 324         cflags += ['/Ox', '/DNDEBUG', '/GL']
 325         ldflags += ['/LTCG', '/OPT:REF', '/OPT:ICF']
 326 else:
 327     cflags = ['-g', '-Wall', '-Wextra',
 328               '-Wno-deprecated',
 329               '-Wno-missing-field-initializers',
 330               '-Wno-unused-parameter',
 331               '-fno-rtti',
 332               '-fno-exceptions',
 333               '-fvisibility=hidden', '-pipe',
 334               '-DNINJA_PYTHON="%s"' % options.with_python]
 335     if options.debug:
 336         cflags += ['-D_GLIBCXX_DEBUG', '-D_GLIBCXX_DEBUG_PEDANTIC']
 337         cflags.remove('-fno-rtti')  # Needed for above pedanticness.
 338     else:
 339         cflags += ['-O2', '-DNDEBUG']
 340     try:
 341         proc = subprocess.Popen(
 342             [CXX, '-fdiagnostics-color', '-c', '-x', 'c++', '/dev/null',
 343              '-o', '/dev/null'],
 344             stdout=open(os.devnull, 'wb'), stderr=subprocess.STDOUT)
 345         if proc.wait() == 0:
 346             cflags += ['-fdiagnostics-color']
 347     except:
 348         pass
 349     if platform.is_mingw():
 350         cflags += ['-D_WIN32_WINNT=0x0501']
 351     ldflags = ['-L$builddir']
 352     if platform.uses_usr_local():
 353         cflags.append('-I/usr/local/include')
 354         ldflags.append('-L/usr/local/lib')
 355
 356 libs = []
 357
 358 if platform.is_mingw():
 359     cflags.remove('-fvisibility=hidden');
 360     ldflags.append('-static')
 361 elif platform.is_solaris():
 362     cflags.remove('-fvisibility=hidden')
 363 elif platform.is_aix():
 364     cflags.remove('-fvisibility=hidden')
 365 elif platform.is_msvc():
 366     pass
 367 else:
 368     if options.profile == 'gmon':
 369         cflags.append('-pg')
 370         ldflags.append('-pg')
 371     elif options.profile == 'pprof':
 372         cflags.append('-fno-omit-frame-pointer')
 373         libs.extend(['-Wl,--no-as-needed', '-lprofiler'])
 374
 375 if platform.supports_ppoll() and not options.force_pselect:
 376     cflags.append('-DUSE_PPOLL')
 377 if platform.supports_ninja_browse():
 378     cflags.append('-DNINJA_HAVE_BROWSE')
 379
 380 # Search for generated headers relative to build dir.
 381 cflags.append('-I.')
 382
 383 def shell_escape(str):
 384     """Escape str such that it's interpreted as a single argument by
 385     the shell."""
 386
 387     # This isn't complete, but it's just enough to make NINJA_PYTHON work.
 388     if platform.is_windows():
 389       return str
 390     if '"' in str:
 391         return "'%s'" % str.replace("'", "\\'")
 392     return str
 393
 394 if 'CFLAGS' in configure_env:
 395     cflags.append(configure_env['CFLAGS'])
 396 n.variable('cflags', ' '.join(shell_escape(flag) for flag in cflags))
 397 if 'LDFLAGS' in configure_env:
 398     ldflags.append(configure_env['LDFLAGS'])
 399 n.variable('ldflags', ' '.join(shell_escape(flag) for flag in ldflags))
 400 n.newline()
 401
 402 if platform.is_msvc():
 403     n.rule('cxx',
 404         command='$cxx $cflags -c $in /Fo$out',
 405         description='CXX $out',
 406         deps='msvc'  # /showIncludes is included in $cflags.
 407     )
 408 else:
 409     n.rule('cxx',
 410         command='$cxx -MMD -MT $out -MF $out.d $cflags -c $in -o $out',
 411         depfile='$out.d',
 412         deps='gcc',
 413         description='CXX $out')
 414 n.newline()
 415
 416 if host.is_msvc():
 417     n.rule('ar',
 418            command='lib /nologo /ltcg /out:$out $in',
 419            description='LIB $out')
 420 elif host.is_mingw():
 421     n.rule('ar',
 422            command='cmd /c $ar cqs $out.tmp $in && move /Y $out.tmp $out',
 423            description='AR $out')
 424 else:
 425     n.rule('ar',
 426            command='rm -f $out && $ar crs $out $in',
 427            description='AR $out')
 428 n.newline()
 429
 430 if platform.is_msvc():
 431     n.rule('link',
 432         command='$cxx $in $libs /nologo /link $ldflags /out:$out',
 433         description='LINK $out')
 434 else:
 435     n.rule('link',
 436         command='$cxx $ldflags -o $out $in $libs',
 437         description='LINK $out')
 438 n.newline()
 439
 440 objs = []
 441
 442 if platform.supports_ninja_browse():
 443     n.comment('browse_py.h is used to inline browse.py.')
 444     n.rule('inline',
 445            command='"%s"' % src('inline.sh') + ' $varname < $in > $out',
 446            description='INLINE $out')
 447     n.build(built('browse_py.h'), 'inline', src('browse.py'),
 448             implicit=src('inline.sh'),
 449             variables=[('varname', 'kBrowsePy')])
 450     n.newline()
 451
 452     objs += cxx('browse', order_only=built('browse_py.h'))
 453     n.newline()
 454
 455 n.comment('the depfile parser and ninja lexers are generated using re2c.')
 456 def has_re2c():
 457     try:
 458         proc = subprocess.Popen(['re2c', '-V'], stdout=subprocess.PIPE)
 459         return int(proc.communicate()[0], 10) >= 1103
 460     except OSError:
 461         return False
 462 if has_re2c():
 463     n.rule('re2c',
 464            command='re2c -b -i --no-generation-date -o $out $in',
 465            description='RE2C $out')
 466     # Generate the .cc files in the source directory so we can check them in.
 467     n.build(src('depfile_parser.cc'), 're2c', src('depfile_parser.in.cc'))
 468     n.build(src('lexer.cc'), 're2c', src('lexer.in.cc'))
 469 else:
 470     print("warning: A compatible version of re2c (>= 0.11.3) was not found; "
 471            "changes to src/*.in.cc will not affect your build.")
 472 n.newline()
 473
 474 n.comment('Core source files all build into ninja library.')
 475 for name in ['build',
 476              'build_log',
 477              'clean',
 478              'debug_flags',
 479              'depfile_parser',
 480              'deps_log',
 481              'disk_interface',
 482              'edit_distance',
 483              'eval_env',
 484              'graph',
 485              'graphviz',
 486              'lexer',
 487              'line_printer',
 488              'manifest_parser',
 489              'metrics',
 490              'state',
 491              'util',
 492              'version']:
 493     objs += cxx(name)
 494 if platform.is_windows():
 495     for name in ['subprocess-win32',
 496                  'includes_normalize-win32',
 497                  'msvc_helper-win32',
 498                  'msvc_helper_main-win32']:
 499         objs += cxx(name)
 500     if platform.is_msvc():
 501         objs += cxx('minidump-win32')
 502     objs += cc('getopt')
 503 else:
 504     objs += cxx('subprocess-posix')
 505 if platform.is_aix():
 506     objs += cc('getopt')
 507 if platform.is_msvc():
 508     ninja_lib = n.build(built('ninja.lib'), 'ar', objs)
 509 else:
 510     ninja_lib = n.build(built('libninja.a'), 'ar', objs)
 511 n.newline()
 512
 513 if platform.is_msvc():
 514     libs.append('ninja.lib')
 515 else:
 516     libs.append('-lninja')
 517
 518 if platform.is_aix():
 519     libs.append('-lperfstat')
 520
 521 all_targets = []
 522
 523 n.comment('Main executable is library plus main() function.')
 524 objs = cxx('ninja')
 525 ninja = n.build(binary('ninja'), 'link', objs, implicit=ninja_lib,
 526                 variables=[('libs', libs)])
 527 n.newline()
 528 all_targets += ninja
 529
 530 if options.bootstrap:
 531     # We've built the ninja binary.  Don't run any more commands
 532     # through the bootstrap executor, but continue writing the
 533     # build.ninja file.
 534     n = ninja_writer
 535
 536 n.comment('Tests all build into ninja_test executable.')
 537
 538 objs = []
 539
 540 for name in ['build_log_test',
 541              'build_test',
 542              'clean_test',
 543              'depfile_parser_test',
 544              'deps_log_test',
 545              'disk_interface_test',
 546              'edit_distance_test',
 547              'graph_test',
 548              'lexer_test',
 549              'manifest_parser_test',
 550              'ninja_test',
 551              'state_test',
 552              'subprocess_test',
 553              'test',
 554              'util_test']:
 555     objs += cxx(name)
 556 if platform.is_windows():
 557     for name in ['includes_normalize_test', 'msvc_helper_test']:
 558         objs += cxx(name)
 559
 560 ninja_test = n.build(binary('ninja_test'), 'link', objs, implicit=ninja_lib,
 561                      variables=[('libs', libs)])
 562 n.newline()
 563 all_targets += ninja_test
 564
 565
 566 n.comment('Ancillary executables.')
 567 objs = cxx('build_log_perftest')
 568 all_targets += n.build(binary('build_log_perftest'), 'link', objs,
 569                        implicit=ninja_lib, variables=[('libs', libs)])
 570 objs = cxx('canon_perftest')
 571 all_targets += n.build(binary('canon_perftest'), 'link', objs,
 572                        implicit=ninja_lib, variables=[('libs', libs)])
 573 objs = cxx('depfile_parser_perftest')
 574 all_targets += n.build(binary('depfile_parser_perftest'), 'link', objs,
 575                        implicit=ninja_lib, variables=[('libs', libs)])
 576 objs = cxx('hash_collision_bench')
 577 all_targets += n.build(binary('hash_collision_bench'), 'link', objs,
 578                               implicit=ninja_lib, variables=[('libs', libs)])
 579 objs = cxx('manifest_parser_perftest')
 580 all_targets += n.build(binary('manifest_parser_perftest'), 'link', objs,
 581                               implicit=ninja_lib, variables=[('libs', libs)])
 582 n.newline()
 583
 584 n.comment('Generate a graph using the "graph" tool.')
 585 n.rule('gendot',
 586        command='./ninja -t graph all > $out')
 587 n.rule('gengraph',
 588        command='dot -Tpng $in > $out')
 589 dot = n.build(built('graph.dot'), 'gendot', ['ninja', 'build.ninja'])
 590 n.build('graph.png', 'gengraph', dot)
 591 n.newline()
 592
 593 n.comment('Generate the manual using asciidoc.')
 594 n.rule('asciidoc',
 595        command='asciidoc -b docbook -d book -o $out $in',
 596        description='ASCIIDOC $out')
 597 n.rule('xsltproc',
 598        command='xsltproc --nonet doc/docbook.xsl $in > $out',
 599        description='XSLTPROC $out')
 600 docbookxml = n.build(built('manual.xml'), 'asciidoc', doc('manual.asciidoc'))
 601 manual = n.build(doc('manual.html'), 'xsltproc', docbookxml,
 602                  implicit=[doc('style.css'), doc('docbook.xsl')])
 603 n.build('manual', 'phony',
 604         order_only=manual)
 605 n.newline()
 606
 607 n.rule('dblatex',
 608        command='dblatex -q -o $out -p doc/dblatex.xsl $in',
 609        description='DBLATEX $out')
 610 n.build(doc('manual.pdf'), 'dblatex', docbookxml,
 611         implicit=[doc('dblatex.xsl')])
 612
 613 n.comment('Generate Doxygen.')
 614 n.rule('doxygen',
 615        command='doxygen $in',
 616        description='DOXYGEN $in')
 617 n.variable('doxygen_mainpage_generator',
 618            src('gen_doxygen_mainpage.sh'))
 619 n.rule('doxygen_mainpage',
 620        command='$doxygen_mainpage_generator $in > $out',
 621        description='DOXYGEN_MAINPAGE $out')
 622 mainpage = n.build(built('doxygen_mainpage'), 'doxygen_mainpage',
 623                    ['README', 'COPYING'],
 624                    implicit=['$doxygen_mainpage_generator'])
 625 n.build('doxygen', 'doxygen', doc('doxygen.config'),
 626         implicit=mainpage)
 627 n.newline()
 628
 629 if not host.is_mingw():
 630     n.comment('Regenerate build files if build script changes.')
 631     n.rule('configure',
 632            command='${configure_env}%s $root/configure.py $configure_args' %
 633                options.with_python,
 634            generator=True)
 635     n.build('build.ninja', 'configure',
 636             implicit=['$root/configure.py',
 637                       os.path.normpath('$root/misc/ninja_syntax.py')])
 638     n.newline()
 639
 640 n.default(ninja)
 641 n.newline()
 642
 643 if host.is_linux():
 644     n.comment('Packaging')
 645     n.rule('rpmbuild',
 646            command="misc/packaging/rpmbuild.sh",
 647            description='Building rpms..')
 648     n.build('rpm', 'rpmbuild')
 649     n.newline()
 650
 651 n.build('all', 'phony', all_targets)
 652
 653 n.close()
 654 print('wrote %s.' % BUILD_FILENAME)
 655
 656 if options.bootstrap:
 657     print('bootstrap complete.  rebuilding...')
 658
 659     rebuild_args = []
 660
 661     if platform.can_rebuild_in_place():
 662         rebuild_args.append('./ninja')
 663     else:
 664         if platform.is_windows():
 665             bootstrap_exe = 'ninja.bootstrap.exe'
 666             final_exe = 'ninja.exe'
 667         else:
 668             bootstrap_exe = './ninja.bootstrap'
 669             final_exe = './ninja'
 670
 671         if os.path.exists(bootstrap_exe):
 672             os.unlink(bootstrap_exe)
 673         os.rename(final_exe, bootstrap_exe)
 674
 675         rebuild_args.append(bootstrap_exe)
 676
 677     if options.verbose:
 678         rebuild_args.append('-v')
 679
 680     subprocess.check_call(rebuild_args)