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         elif self._platform.startswith('dragonfly'):
  64             self._platform = 'dragonfly'
  65
  66     @staticmethod
  67     def known_platforms():
  68       return ['linux', 'darwin', 'freebsd', 'openbsd', 'solaris', 'sunos5',
  69               'mingw', 'msvc', 'gnukfreebsd', 'bitrig', 'netbsd', 'aix',
  70               'dragonfly']
  71
  72     def platform(self):
  73         return self._platform
  74
  75     def is_linux(self):
  76         return self._platform == 'linux'
  77
  78     def is_mingw(self):
  79         return self._platform == 'mingw'
  80
  81     def is_msvc(self):
  82         return self._platform == 'msvc'
  83
  84     def msvc_needs_fs(self):
  85         popen = subprocess.Popen(['cl', '/nologo', '/?'],
  86                                  stdout=subprocess.PIPE,
  87                                  stderr=subprocess.PIPE)
  88         out, err = popen.communicate()
  89         return b'/FS' in out
  90
  91     def is_windows(self):
  92         return self.is_mingw() or self.is_msvc()
  93
  94     def is_solaris(self):
  95         return self._platform == 'solaris'
  96
  97     def is_aix(self):
  98         return self._platform == 'aix'
  99
 100     def uses_usr_local(self):
 101         return self._platform in ('freebsd', 'openbsd', 'bitrig', 'dragonfly', 'netbsd')
 102
 103     def supports_ppoll(self):
 104         return self._platform in ('freebsd', 'linux', 'openbsd', 'bitrig',
 105                                   'dragonfly')
 106
 107     def supports_ninja_browse(self):
 108         return (not self.is_windows()
 109                 and not self.is_solaris()
 110                 and not self.is_aix())
 111
 112     def can_rebuild_in_place(self):
 113         return not (self.is_windows() or self.is_aix())
 114
 115 class Bootstrap:
 116     """API shim for ninja_syntax.Writer that instead runs the commands.
 117
 118     Used to bootstrap Ninja from scratch.  In --bootstrap mode this
 119     class is used to execute all the commands to build an executable.
 120     It also proxies all calls to an underlying ninja_syntax.Writer, to
 121     behave like non-bootstrap mode.
 122     """
 123     def __init__(self, writer, verbose=False):
 124         self.writer = writer
 125         self.verbose = verbose
 126         # Map of variable name => expanded variable value.
 127         self.vars = {}
 128         # Map of rule name => dict of rule attributes.
 129         self.rules = {
 130             'phony': {}
 131         }
 132
 133     def comment(self, text):
 134         return self.writer.comment(text)
 135
 136     def newline(self):
 137         return self.writer.newline()
 138
 139     def variable(self, key, val):
 140         # In bootstrap mode, we have no ninja process to catch /showIncludes
 141         # output.
 142         self.vars[key] = self._expand(val).replace('/showIncludes', '')
 143         return self.writer.variable(key, val)
 144
 145     def rule(self, name, **kwargs):
 146         self.rules[name] = kwargs
 147         return self.writer.rule(name, **kwargs)
 148
 149     def build(self, outputs, rule, inputs=None, **kwargs):
 150         ruleattr = self.rules[rule]
 151         cmd = ruleattr.get('command')
 152         if cmd is None:  # A phony rule, for example.
 153             return
 154
 155         # Implement just enough of Ninja variable expansion etc. to
 156         # make the bootstrap build work.
 157         local_vars = {
 158             'in': self._expand_paths(inputs),
 159             'out': self._expand_paths(outputs)
 160         }
 161         for key, val in kwargs.get('variables', []):
 162             local_vars[key] = ' '.join(ninja_syntax.as_list(val))
 163
 164         self._run_command(self._expand(cmd, local_vars))
 165
 166         return self.writer.build(outputs, rule, inputs, **kwargs)
 167
 168     def default(self, paths):
 169         return self.writer.default(paths)
 170
 171     def _expand_paths(self, paths):
 172         """Expand $vars in an array of paths, e.g. from a 'build' block."""
 173         paths = ninja_syntax.as_list(paths)
 174         return ' '.join(map(self._shell_escape, (map(self._expand, paths))))
 175
 176     def _expand(self, str, local_vars={}):
 177         """Expand $vars in a string."""
 178         return ninja_syntax.expand(str, self.vars, local_vars)
 179
 180     def _shell_escape(self, path):
 181         """Quote paths containing spaces."""
 182         return '"%s"' % path if ' ' in path else path
 183
 184     def _run_command(self, cmdline):
 185         """Run a subcommand, quietly.  Prints the full command on error."""
 186         try:
 187             if self.verbose:
 188                 print(cmdline)
 189             subprocess.check_call(cmdline, shell=True)
 190         except subprocess.CalledProcessError:
 191             print('when running: ', cmdline)
 192             raise
 193
 194
 195 parser = OptionParser()
 196 profilers = ['gmon', 'pprof']
 197 parser.add_option('--bootstrap', action='store_true',
 198                   help='bootstrap a ninja binary from nothing')
 199 parser.add_option('--verbose', action='store_true',
 200                   help='enable verbose build')
 201 parser.add_option('--platform',
 202                   help='target platform (' +
 203                        '/'.join(Platform.known_platforms()) + ')',
 204                   choices=Platform.known_platforms())
 205 parser.add_option('--host',
 206                   help='host platform (' +
 207                        '/'.join(Platform.known_platforms()) + ')',
 208                   choices=Platform.known_platforms())
 209 parser.add_option('--debug', action='store_true',
 210                   help='enable debugging extras',)
 211 parser.add_option('--profile', metavar='TYPE',
 212                   choices=profilers,
 213                   help='enable profiling (' + '/'.join(profilers) + ')',)
 214 parser.add_option('--with-gtest', metavar='PATH', help='ignored')
 215 parser.add_option('--with-python', metavar='EXE',
 216                   help='use EXE as the Python interpreter',
 217                   default=os.path.basename(sys.executable))
 218 parser.add_option('--force-pselect', action='store_true',
 219                   help='ppoll() is used by default where available, '
 220                        'but some platforms may need to use pselect instead',)
 221 (options, args) = parser.parse_args()
 222 if args:
 223     print('ERROR: extra unparsed command-line arguments:', args)
 224     sys.exit(1)
 225
 226 platform = Platform(options.platform)
 227 if options.host:
 228     host = Platform(options.host)
 229 else:
 230     host = platform
 231
 232 BUILD_FILENAME = 'build.ninja'
 233 ninja_writer = ninja_syntax.Writer(open(BUILD_FILENAME, 'w'))
 234 n = ninja_writer
 235
 236 if options.bootstrap:
 237     # Make the build directory.
 238     try:
 239         os.mkdir('build')
 240     except OSError:
 241         pass
 242     # Wrap ninja_writer with the Bootstrapper, which also executes the
 243     # commands.
 244     print('bootstrapping ninja...')
 245     n = Bootstrap(n, verbose=options.verbose)
 246
 247 n.comment('This file is used to build ninja itself.')
 248 n.comment('It is generated by ' + os.path.basename(__file__) + '.')
 249 n.newline()
 250
 251 n.variable('ninja_required_version', '1.3')
 252 n.newline()
 253
 254 n.comment('The arguments passed to configure.py, for rerunning it.')
 255 configure_args = sys.argv[1:]
 256 if '--bootstrap' in configure_args:
 257     configure_args.remove('--bootstrap')
 258 n.variable('configure_args', ' '.join(configure_args))
 259 env_keys = set(['CXX', 'AR', 'CFLAGS', 'CXXFLAGS', 'LDFLAGS'])
 260 configure_env = dict((k, os.environ[k]) for k in os.environ if k in env_keys)
 261 if configure_env:
 262     config_str = ' '.join([k + '=' + pipes.quote(configure_env[k])
 263                            for k in configure_env])
 264     n.variable('configure_env', config_str + '$ ')
 265 n.newline()
 266
 267 CXX = configure_env.get('CXX', 'g++')
 268 objext = '.o'
 269 if platform.is_msvc():
 270     CXX = 'cl'
 271     objext = '.obj'
 272
 273 def src(filename):
 274     return os.path.join('$root', 'src', filename)
 275 def built(filename):
 276     return os.path.join('$builddir', filename)
 277 def doc(filename):
 278     return os.path.join('$root', 'doc', filename)
 279 def cc(name, **kwargs):
 280     return n.build(built(name + objext), 'cxx', src(name + '.c'), **kwargs)
 281 def cxx(name, **kwargs):
 282     return n.build(built(name + objext), 'cxx', src(name + '.cc'), **kwargs)
 283 def binary(name):
 284     if platform.is_windows():
 285         exe = name + '.exe'
 286         n.build(name, 'phony', exe)
 287         return exe
 288     return name
 289
 290 root = sourcedir
 291 if root == os.getcwd():
 292     # In the common case where we're building directly in the source
 293     # tree, simplify all the paths to just be cwd-relative.
 294     root = '.'
 295 n.variable('root', root)
 296 n.variable('builddir', 'build')
 297 n.variable('cxx', CXX)
 298 if platform.is_msvc():
 299     n.variable('ar', 'link')
 300 else:
 301     n.variable('ar', configure_env.get('AR', 'ar'))
 302
 303 if platform.is_msvc():
 304     cflags = ['/showIncludes',
 305               '/nologo',  # Don't print startup banner.
 306               '/Zi',  # Create pdb with debug info.
 307               '/W4',  # Highest warning level.
 308               '/WX',  # Warnings as errors.
 309               '/wd4530', '/wd4100', '/wd4706', '/wd4244',
 310               '/wd4512', '/wd4800', '/wd4702', '/wd4819',
 311               # Disable warnings about constant conditional expressions.
 312               '/wd4127',
 313               # Disable warnings about passing "this" during initialization.
 314               '/wd4355',
 315               # Disable warnings about ignored typedef in DbgHelp.h
 316               '/wd4091',
 317               '/GR-',  # Disable RTTI.
 318               # Disable size_t -> int truncation warning.
 319               # We never have strings or arrays larger than 2**31.
 320               '/wd4267',
 321               '/DNOMINMAX', '/D_CRT_SECURE_NO_WARNINGS',
 322               '/D_HAS_EXCEPTIONS=0',
 323               '/DNINJA_PYTHON="%s"' % options.with_python]
 324     if platform.msvc_needs_fs():
 325         cflags.append('/FS')
 326     ldflags = ['/DEBUG', '/libpath:$builddir']
 327     if not options.debug:
 328         cflags += ['/Ox', '/DNDEBUG', '/GL']
 329         ldflags += ['/LTCG', '/OPT:REF', '/OPT:ICF']
 330 else:
 331     cflags = ['-g', '-Wall', '-Wextra',
 332               '-Wno-deprecated',
 333               '-Wno-missing-field-initializers',
 334               '-Wno-unused-parameter',
 335               '-fno-rtti',
 336               '-fno-exceptions',
 337               '-fvisibility=hidden', '-pipe',
 338               '-DNINJA_PYTHON="%s"' % options.with_python]
 339     if options.debug:
 340         cflags += ['-D_GLIBCXX_DEBUG', '-D_GLIBCXX_DEBUG_PEDANTIC']
 341         cflags.remove('-fno-rtti')  # Needed for above pedanticness.
 342     else:
 343         cflags += ['-O2', '-DNDEBUG']
 344     try:
 345         proc = subprocess.Popen(
 346             [CXX, '-fdiagnostics-color', '-c', '-x', 'c++', '/dev/null',
 347              '-o', '/dev/null'],
 348             stdout=open(os.devnull, 'wb'), stderr=subprocess.STDOUT)
 349         if proc.wait() == 0:
 350             cflags += ['-fdiagnostics-color']
 351     except:
 352         pass
 353     if platform.is_mingw():
 354         cflags += ['-D_WIN32_WINNT=0x0501']
 355     ldflags = ['-L$builddir']
 356     if platform.uses_usr_local():
 357         cflags.append('-I/usr/local/include')
 358         ldflags.append('-L/usr/local/lib')
 359     if platform.is_aix():
 360         # printf formats for int64_t, uint64_t; large file support
 361         cflags.append('-D__STDC_FORMAT_MACROS')
 362         cflags.append('-D_LARGE_FILES')
 363
 364
 365 libs = []
 366
 367 if platform.is_mingw():
 368     cflags.remove('-fvisibility=hidden');
 369     ldflags.append('-static')
 370 elif platform.is_solaris():
 371     cflags.remove('-fvisibility=hidden')
 372 elif platform.is_aix():
 373     cflags.remove('-fvisibility=hidden')
 374 elif platform.is_msvc():
 375     pass
 376 else:
 377     if options.profile == 'gmon':
 378         cflags.append('-pg')
 379         ldflags.append('-pg')
 380     elif options.profile == 'pprof':
 381         cflags.append('-fno-omit-frame-pointer')
 382         libs.extend(['-Wl,--no-as-needed', '-lprofiler'])
 383
 384 if platform.supports_ppoll() and not options.force_pselect:
 385     cflags.append('-DUSE_PPOLL')
 386 if platform.supports_ninja_browse():
 387     cflags.append('-DNINJA_HAVE_BROWSE')
 388
 389 # Search for generated headers relative to build dir.
 390 cflags.append('-I.')
 391
 392 def shell_escape(str):
 393     """Escape str such that it's interpreted as a single argument by
 394     the shell."""
 395
 396     # This isn't complete, but it's just enough to make NINJA_PYTHON work.
 397     if platform.is_windows():
 398       return str
 399     if '"' in str:
 400         return "'%s'" % str.replace("'", "\\'")
 401     return str
 402
 403 if 'CFLAGS' in configure_env:
 404     cflags.append(configure_env['CFLAGS'])
 405     ldflags.append(configure_env['CFLAGS'])
 406 if 'CXXFLAGS' in configure_env:
 407     cflags.append(configure_env['CXXFLAGS'])
 408     ldflags.append(configure_env['CXXFLAGS'])
 409 n.variable('cflags', ' '.join(shell_escape(flag) for flag in cflags))
 410 if 'LDFLAGS' in configure_env:
 411     ldflags.append(configure_env['LDFLAGS'])
 412 n.variable('ldflags', ' '.join(shell_escape(flag) for flag in ldflags))
 413 n.newline()
 414
 415 if platform.is_msvc():
 416     n.rule('cxx',
 417         command='$cxx $cflags -c $in /Fo$out /Fd' + built('$pdb'),
 418         description='CXX $out',
 419         deps='msvc'  # /showIncludes is included in $cflags.
 420     )
 421 else:
 422     n.rule('cxx',
 423         command='$cxx -MMD -MT $out -MF $out.d $cflags -c $in -o $out',
 424         depfile='$out.d',
 425         deps='gcc',
 426         description='CXX $out')
 427 n.newline()
 428
 429 if host.is_msvc():
 430     n.rule('ar',
 431            command='lib /nologo /ltcg /out:$out $in',
 432            description='LIB $out')
 433 elif host.is_mingw():
 434     n.rule('ar',
 435            command='cmd /c $ar cqs $out.tmp $in && move /Y $out.tmp $out',
 436            description='AR $out')
 437 else:
 438     n.rule('ar',
 439            command='rm -f $out && $ar crs $out $in',
 440            description='AR $out')
 441 n.newline()
 442
 443 if platform.is_msvc():
 444     n.rule('link',
 445         command='$cxx $in $libs /nologo /link $ldflags /out:$out',
 446         description='LINK $out')
 447 else:
 448     n.rule('link',
 449         command='$cxx $ldflags -o $out $in $libs',
 450         description='LINK $out')
 451 n.newline()
 452
 453 objs = []
 454
 455 if platform.supports_ninja_browse():
 456     n.comment('browse_py.h is used to inline browse.py.')
 457     n.rule('inline',
 458            command='"%s"' % src('inline.sh') + ' $varname < $in > $out',
 459            description='INLINE $out')
 460     n.build(built('browse_py.h'), 'inline', src('browse.py'),
 461             implicit=src('inline.sh'),
 462             variables=[('varname', 'kBrowsePy')])
 463     n.newline()
 464
 465     objs += cxx('browse', order_only=built('browse_py.h'))
 466     n.newline()
 467
 468 n.comment('the depfile parser and ninja lexers are generated using re2c.')
 469 def has_re2c():
 470     try:
 471         proc = subprocess.Popen(['re2c', '-V'], stdout=subprocess.PIPE)
 472         return int(proc.communicate()[0], 10) >= 1103
 473     except OSError:
 474         return False
 475 if has_re2c():
 476     n.rule('re2c',
 477            command='re2c -b -i --no-generation-date -o $out $in',
 478            description='RE2C $out')
 479     # Generate the .cc files in the source directory so we can check them in.
 480     n.build(src('depfile_parser.cc'), 're2c', src('depfile_parser.in.cc'))
 481     n.build(src('lexer.cc'), 're2c', src('lexer.in.cc'))
 482 else:
 483     print("warning: A compatible version of re2c (>= 0.11.3) was not found; "
 484            "changes to src/*.in.cc will not affect your build.")
 485 n.newline()
 486
 487 n.comment('Core source files all build into ninja library.')
 488 cxxvariables = []
 489 if platform.is_msvc():
 490     cxxvariables = [('pdb', 'ninja.pdb')]
 491 for name in ['build',
 492              'build_log',
 493              'clean',
 494              'clparser',
 495              'debug_flags',
 496              'depfile_parser',
 497              'deps_log',
 498              'disk_interface',
 499              'edit_distance',
 500              'eval_env',
 501              'graph',
 502              'graphviz',
 503              'lexer',
 504              'line_printer',
 505              'manifest_parser',
 506              'metrics',
 507              'state',
 508              'string_piece_util',
 509              'util',
 510              'version']:
 511     objs += cxx(name, variables=cxxvariables)
 512 if platform.is_windows():
 513     for name in ['subprocess-win32',
 514                  'includes_normalize-win32',
 515                  'msvc_helper-win32',
 516                  'msvc_helper_main-win32']:
 517         objs += cxx(name, variables=cxxvariables)
 518     if platform.is_msvc():
 519         objs += cxx('minidump-win32', variables=cxxvariables)
 520     objs += cc('getopt')
 521 else:
 522     objs += cxx('subprocess-posix')
 523 if platform.is_aix():
 524     objs += cc('getopt')
 525 if platform.is_msvc():
 526     ninja_lib = n.build(built('ninja.lib'), 'ar', objs)
 527 else:
 528     ninja_lib = n.build(built('libninja.a'), 'ar', objs)
 529 n.newline()
 530
 531 if platform.is_msvc():
 532     libs.append('ninja.lib')
 533 else:
 534     libs.append('-lninja')
 535
 536 if platform.is_aix():
 537     libs.append('-lperfstat')
 538
 539 all_targets = []
 540
 541 n.comment('Main executable is library plus main() function.')
 542 objs = cxx('ninja', variables=cxxvariables)
 543 ninja = n.build(binary('ninja'), 'link', objs, implicit=ninja_lib,
 544                 variables=[('libs', libs)])
 545 n.newline()
 546 all_targets += ninja
 547
 548 if options.bootstrap:
 549     # We've built the ninja binary.  Don't run any more commands
 550     # through the bootstrap executor, but continue writing the
 551     # build.ninja file.
 552     n = ninja_writer
 553
 554 n.comment('Tests all build into ninja_test executable.')
 555
 556 objs = []
 557 if platform.is_msvc():
 558     cxxvariables = [('pdb', 'ninja_test.pdb')]
 559
 560 for name in ['build_log_test',
 561              'build_test',
 562              'clean_test',
 563              'clparser_test',
 564              'depfile_parser_test',
 565              'deps_log_test',
 566              'disk_interface_test',
 567              'edit_distance_test',
 568              'graph_test',
 569              'lexer_test',
 570              'manifest_parser_test',
 571              'ninja_test',
 572              'state_test',
 573              'string_piece_util_test',
 574              'subprocess_test',
 575              'test',
 576              'util_test']:
 577     objs += cxx(name, variables=cxxvariables)
 578 if platform.is_windows():
 579     for name in ['includes_normalize_test', 'msvc_helper_test']:
 580         objs += cxx(name, variables=cxxvariables)
 581
 582 ninja_test = n.build(binary('ninja_test'), 'link', objs, implicit=ninja_lib,
 583                      variables=[('libs', libs)])
 584 n.newline()
 585 all_targets += ninja_test
 586
 587
 588 n.comment('Ancillary executables.')
 589
 590 for name in ['build_log_perftest',
 591              'canon_perftest',
 592              'depfile_parser_perftest',
 593              'hash_collision_bench',
 594              'manifest_parser_perftest',
 595              'clparser_perftest']:
 596   if platform.is_msvc():
 597     cxxvariables = [('pdb', name + '.pdb')]
 598   objs = cxx(name, variables=cxxvariables)
 599   all_targets += n.build(binary(name), 'link', objs,
 600                          implicit=ninja_lib, variables=[('libs', libs)])
 601
 602 n.newline()
 603
 604 n.comment('Generate a graph using the "graph" tool.')
 605 n.rule('gendot',
 606        command='./ninja -t graph all > $out')
 607 n.rule('gengraph',
 608        command='dot -Tpng $in > $out')
 609 dot = n.build(built('graph.dot'), 'gendot', ['ninja', 'build.ninja'])
 610 n.build('graph.png', 'gengraph', dot)
 611 n.newline()
 612
 613 n.comment('Generate the manual using asciidoc.')
 614 n.rule('asciidoc',
 615        command='asciidoc -b docbook -d book -o $out $in',
 616        description='ASCIIDOC $out')
 617 n.rule('xsltproc',
 618        command='xsltproc --nonet doc/docbook.xsl $in > $out',
 619        description='XSLTPROC $out')
 620 docbookxml = n.build(built('manual.xml'), 'asciidoc', doc('manual.asciidoc'))
 621 manual = n.build(doc('manual.html'), 'xsltproc', docbookxml,
 622                  implicit=[doc('style.css'), doc('docbook.xsl')])
 623 n.build('manual', 'phony',
 624         order_only=manual)
 625 n.newline()
 626
 627 n.rule('dblatex',
 628        command='dblatex -q -o $out -p doc/dblatex.xsl $in',
 629        description='DBLATEX $out')
 630 n.build(doc('manual.pdf'), 'dblatex', docbookxml,
 631         implicit=[doc('dblatex.xsl')])
 632
 633 n.comment('Generate Doxygen.')
 634 n.rule('doxygen',
 635        command='doxygen $in',
 636        description='DOXYGEN $in')
 637 n.variable('doxygen_mainpage_generator',
 638            src('gen_doxygen_mainpage.sh'))
 639 n.rule('doxygen_mainpage',
 640        command='$doxygen_mainpage_generator $in > $out',
 641        description='DOXYGEN_MAINPAGE $out')
 642 mainpage = n.build(built('doxygen_mainpage'), 'doxygen_mainpage',
 643                    ['README', 'COPYING'],
 644                    implicit=['$doxygen_mainpage_generator'])
 645 n.build('doxygen', 'doxygen', doc('doxygen.config'),
 646         implicit=mainpage)
 647 n.newline()
 648
 649 if not host.is_mingw():
 650     n.comment('Regenerate build files if build script changes.')
 651     n.rule('configure',
 652            command='${configure_env}%s $root/configure.py $configure_args' %
 653                options.with_python,
 654            generator=True)
 655     n.build('build.ninja', 'configure',
 656             implicit=['$root/configure.py',
 657                       os.path.normpath('$root/misc/ninja_syntax.py')])
 658     n.newline()
 659
 660 n.default(ninja)
 661 n.newline()
 662
 663 if host.is_linux():
 664     n.comment('Packaging')
 665     n.rule('rpmbuild',
 666            command="misc/packaging/rpmbuild.sh",
 667            description='Building rpms..')
 668     n.build('rpm', 'rpmbuild')
 669     n.newline()
 670
 671 n.build('all', 'phony', all_targets)
 672
 673 n.close()
 674 print('wrote %s.' % BUILD_FILENAME)
 675
 676 if options.bootstrap:
 677     print('bootstrap complete.  rebuilding...')
 678
 679     rebuild_args = []
 680
 681     if platform.can_rebuild_in_place():
 682         rebuild_args.append('./ninja')
 683     else:
 684         if platform.is_windows():
 685             bootstrap_exe = 'ninja.bootstrap.exe'
 686             final_exe = 'ninja.exe'
 687         else:
 688             bootstrap_exe = './ninja.bootstrap'
 689             final_exe = './ninja'
 690
 691         if os.path.exists(bootstrap_exe):
 692             os.unlink(bootstrap_exe)
 693         os.rename(final_exe, bootstrap_exe)
 694
 695         rebuild_args.append(bootstrap_exe)
 696
 697     if options.verbose:
 698         rebuild_args.append('-v')
 699
 700     subprocess.check_call(rebuild_args)