scons/gallium.py

   1 """gallium
   2
   3 Frontend-tool for Gallium3D architecture.
   4
   5 """
   6
   7 #
   8 # Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
   9 # All Rights Reserved.
  10 #
  11 # Permission is hereby granted, free of charge, to any person obtaining a
  12 # copy of this software and associated documentation files (the
  13 # "Software"), to deal in the Software without restriction, including
  14 # without limitation the rights to use, copy, modify, merge, publish,
  15 # distribute, sub license, and/or sell copies of the Software, and to
  16 # permit persons to whom the Software is furnished to do so, subject to
  17 # the following conditions:
  18 #
  19 # The above copyright notice and this permission notice (including the
  20 # next paragraph) shall be included in all copies or substantial portions
  21 # of the Software.
  22 #
  23 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  24 # OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25 # MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  26 # IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  27 # ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  28 # TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  29 # SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  30 #
  31
  32
  33 import distutils.version
  34 import os
  35 import os.path
  36 import re
  37 import subprocess
  38 import platform as _platform
  39
  40 import SCons.Action
  41 import SCons.Builder
  42 import SCons.Scanner
  43
  44
  45 def symlink(target, source, env):
  46     target = str(target[0])
  47     source = str(source[0])
  48     if os.path.islink(target) or os.path.exists(target):
  49         os.remove(target)
  50     os.symlink(os.path.basename(source), target)
  51
  52 def install(env, source, subdir):
  53     target_dir = os.path.join(env.Dir('#.').srcnode().abspath, env['build_dir'], subdir)
  54     return env.Install(target_dir, source)
  55
  56 def install_program(env, source):
  57     return install(env, source, 'bin')
  58
  59 def install_shared_library(env, sources, version = ()):
  60     targets = []
  61     install_dir = os.path.join(env.Dir('#.').srcnode().abspath, env['build_dir'])
  62     version = tuple(map(str, version))
  63     if env['SHLIBSUFFIX'] == '.dll':
  64         dlls = env.FindIxes(sources, 'SHLIBPREFIX', 'SHLIBSUFFIX')
  65         targets += install(env, dlls, 'bin')
  66         libs = env.FindIxes(sources, 'LIBPREFIX', 'LIBSUFFIX')
  67         targets += install(env, libs, 'lib')
  68     else:
  69         for source in sources:
  70             target_dir =  os.path.join(install_dir, 'lib')
  71             target_name = '.'.join((str(source),) + version)
  72             last = env.InstallAs(os.path.join(target_dir, target_name), source)
  73             targets += last
  74             while len(version):
  75                 version = version[:-1]
  76                 target_name = '.'.join((str(source),) + version)
  77                 action = SCons.Action.Action(symlink, "  Symlinking $TARGET ...")
  78                 last = env.Command(os.path.join(target_dir, target_name), last, action)
  79                 targets += last
  80     return targets
  81
  82
  83 def createInstallMethods(env):
  84     env.AddMethod(install_program, 'InstallProgram')
  85     env.AddMethod(install_shared_library, 'InstallSharedLibrary')
  86
  87
  88 def num_jobs():
  89     try:
  90         return int(os.environ['NUMBER_OF_PROCESSORS'])
  91     except (ValueError, KeyError):
  92         pass
  93
  94     try:
  95         return os.sysconf('SC_NPROCESSORS_ONLN')
  96     except (ValueError, OSError, AttributeError):
  97         pass
  98
  99     try:
 100         return int(os.popen2("sysctl -n hw.ncpu")[1].read())
 101     except ValueError:
 102         pass
 103
 104     return 1
 105
 106
 107 def pkg_config_modules(env, name, modules):
 108     '''Simple wrapper for pkg-config.'''
 109
 110     env[name] = False
 111
 112     if env['platform'] == 'windows':
 113         return
 114
 115     if not env.Detect('pkg-config'):
 116         return
 117
 118     if subprocess.call(["pkg-config", "--exists", ' '.join(modules)]) != 0:
 119         return
 120
 121     # Put -I and -L flags directly into the environment, as these don't affect
 122     # the compilation of targets that do not use them
 123     try:
 124         env.ParseConfig('pkg-config --cflags-only-I --libs-only-L ' + ' '.join(modules))
 125     except OSError:
 126         return
 127
 128     # Other flags may affect the compilation of unrelated targets, so store
 129     # them with a prefix, (e.g., XXX_CFLAGS, XXX_LIBS, etc)
 130     try:
 131         flags = env.ParseFlags('!pkg-config --cflags-only-other --libs-only-l --libs-only-other ' + ' '.join(modules))
 132     except OSError:
 133         return
 134     prefix = name.upper() + '_'
 135     for flag_name, flag_value in flags.iteritems():
 136         env[prefix + flag_name] = flag_value
 137
 138     env[name] = True
 139
 140
 141
 142 def generate(env):
 143     """Common environment generation code"""
 144
 145     # Tell tools which machine to compile for
 146     env['TARGET_ARCH'] = env['machine']
 147     env['MSVS_ARCH'] = env['machine']
 148
 149     # Toolchain
 150     platform = env['platform']
 151     if env['toolchain'] == 'default':
 152         if platform == 'winddk':
 153             env['toolchain'] = 'winddk'
 154         elif platform == 'wince':
 155             env['toolchain'] = 'wcesdk'
 156     env.Tool(env['toolchain'])
 157
 158     # Allow override compiler and specify additional flags from environment
 159     if os.environ.has_key('CC'):
 160         env['CC'] = os.environ['CC']
 161         # Update CCVERSION to match
 162         pipe = SCons.Action._subproc(env, [env['CC'], '--version'],
 163                                      stdin = 'devnull',
 164                                      stderr = 'devnull',
 165                                      stdout = subprocess.PIPE)
 166         if pipe.wait() == 0:
 167             line = pipe.stdout.readline()
 168             match = re.search(r'[0-9]+(\.[0-9]+)+', line)
 169             if match:
 170                 env['CCVERSION'] = match.group(0)
 171     if os.environ.has_key('CFLAGS'):
 172         env['CCFLAGS'] += SCons.Util.CLVar(os.environ['CFLAGS'])
 173     if os.environ.has_key('CXX'):
 174         env['CXX'] = os.environ['CXX']
 175     if os.environ.has_key('CXXFLAGS'):
 176         env['CXXFLAGS'] += SCons.Util.CLVar(os.environ['CXXFLAGS'])
 177     if os.environ.has_key('LDFLAGS'):
 178         env['LINKFLAGS'] += SCons.Util.CLVar(os.environ['LDFLAGS'])
 179
 180     env['gcc'] = 'gcc' in os.path.basename(env['CC']).split('-')
 181     env['msvc'] = env['CC'] == 'cl'
 182
 183     if env['msvc'] and env['toolchain'] == 'default' and env['machine'] == 'x86_64':
 184         # MSVC x64 support is broken in earlier versions of scons
 185         env.EnsurePythonVersion(2, 0)
 186
 187     # shortcuts
 188     machine = env['machine']
 189     platform = env['platform']
 190     x86 = env['machine'] == 'x86'
 191     ppc = env['machine'] == 'ppc'
 192     gcc = env['gcc']
 193     msvc = env['msvc']
 194
 195     # Determine whether we are cross compiling; in particular, whether we need
 196     # to compile code generators with a different compiler as the target code.
 197     host_platform = _platform.system().lower()
 198     if host_platform.startswith('cygwin'):
 199         host_platform = 'cygwin'
 200     host_machine = os.environ.get('PROCESSOR_ARCHITEW6432', os.environ.get('PROCESSOR_ARCHITECTURE', _platform.machine()))
 201     host_machine = {
 202         'x86': 'x86',
 203         'i386': 'x86',
 204         'i486': 'x86',
 205         'i586': 'x86',
 206         'i686': 'x86',
 207         'ppc' : 'ppc',
 208         'AMD64': 'x86_64',
 209         'x86_64': 'x86_64',
 210     }.get(host_machine, 'generic')
 211     env['crosscompile'] = platform != host_platform
 212     if machine == 'x86_64' and host_machine != 'x86_64':
 213         env['crosscompile'] = True
 214     env['hostonly'] = False
 215
 216     # Backwards compatability with the debug= profile= options
 217     if env['build'] == 'debug':
 218         if not env['debug']:
 219             print 'scons: warning: debug option is deprecated and will be removed eventually; use instead'
 220             print
 221             print ' scons build=release'
 222             print
 223             env['build'] = 'release'
 224         if env['profile']:
 225             print 'scons: warning: profile option is deprecated and will be removed eventually; use instead'
 226             print
 227             print ' scons build=profile'
 228             print
 229             env['build'] = 'profile'
 230     if False:
 231         # Enforce SConscripts to use the new build variable
 232         env.popitem('debug')
 233         env.popitem('profile')
 234     else:
 235         # Backwards portability with older sconscripts
 236         if env['build'] in ('debug', 'checked'):
 237             env['debug'] = True
 238             env['profile'] = False
 239         if env['build'] == 'profile':
 240             env['debug'] = False
 241             env['profile'] = True
 242         if env['build'] == 'release':
 243             env['debug'] = False
 244             env['profile'] = False
 245
 246     # Put build output in a separate dir, which depends on the current
 247     # configuration. See also http://www.scons.org/wiki/AdvancedBuildExample
 248     build_topdir = 'build'
 249     build_subdir = env['platform']
 250     if env['embedded']:
 251         build_subdir =  'embedded-' + build_subdir
 252     if env['machine'] != 'generic':
 253         build_subdir += '-' + env['machine']
 254     if env['build'] != 'release':
 255         build_subdir += '-' +  env['build']
 256     build_dir = os.path.join(build_topdir, build_subdir)
 257     # Place the .sconsign file in the build dir too, to avoid issues with
 258     # different scons versions building the same source file
 259     env['build_dir'] = build_dir
 260     env.SConsignFile(os.path.join(build_dir, '.sconsign'))
 261     if 'SCONS_CACHE_DIR' in os.environ:
 262         print 'scons: Using build cache in %s.' % (os.environ['SCONS_CACHE_DIR'],)
 263         env.CacheDir(os.environ['SCONS_CACHE_DIR'])
 264     env['CONFIGUREDIR'] = os.path.join(build_dir, 'conf')
 265     env['CONFIGURELOG'] = os.path.join(os.path.abspath(build_dir), 'config.log')
 266
 267     # Parallel build
 268     if env.GetOption('num_jobs') <= 1:
 269         env.SetOption('num_jobs', num_jobs())
 270
 271     env.Decider('MD5-timestamp')
 272     env.SetOption('max_drift', 60)
 273
 274     # C preprocessor options
 275     cppdefines = []
 276     if env['build'] in ('debug', 'checked'):
 277         cppdefines += ['DEBUG']
 278     else:
 279         cppdefines += ['NDEBUG']
 280     if env['build'] == 'profile':
 281         cppdefines += ['PROFILE']
 282     if env['platform'] in ('posix', 'linux', 'freebsd', 'darwin'):
 283         cppdefines += [
 284             '_POSIX_SOURCE',
 285             ('_POSIX_C_SOURCE', '199309L'),
 286             '_SVID_SOURCE',
 287             '_BSD_SOURCE',
 288             '_GNU_SOURCE',
 289             'PTHREADS',
 290             'HAVE_POSIX_MEMALIGN',
 291         ]
 292     if env['platform'] == 'darwin':
 293         cppdefines += ['_DARWIN_C_SOURCE']
 294     if platform == 'windows':
 295         cppdefines += [
 296             'WIN32',
 297             '_WINDOWS',
 298             #'_UNICODE',
 299             #'UNICODE',
 300             # http://msdn.microsoft.com/en-us/library/aa383745.aspx
 301             ('_WIN32_WINNT', '0x0601'),
 302             ('WINVER', '0x0601'),
 303         ]
 304         if msvc and env['toolchain'] != 'winddk':
 305             cppdefines += [
 306                 'VC_EXTRALEAN',
 307                 '_USE_MATH_DEFINES',
 308                 '_CRT_SECURE_NO_WARNINGS',
 309                 '_CRT_SECURE_NO_DEPRECATE',
 310                 '_SCL_SECURE_NO_WARNINGS',
 311                 '_SCL_SECURE_NO_DEPRECATE',
 312             ]
 313         if env['build'] in ('debug', 'checked'):
 314             cppdefines += ['_DEBUG']
 315     if env['toolchain'] == 'winddk':
 316         # Mimic WINDDK's builtin flags. See also:
 317         # - WINDDK's bin/makefile.new i386mk.inc for more info.
 318         # - buildchk_wxp_x86.log files, generated by the WINDDK's build
 319         # - http://alter.org.ua/docs/nt_kernel/vc8_proj/
 320         if machine == 'x86':
 321             cppdefines += ['_X86_', 'i386']
 322         if machine == 'x86_64':
 323             cppdefines += ['_AMD64_', 'AMD64']
 324     if platform == 'winddk':
 325         cppdefines += [
 326             'STD_CALL',
 327             ('CONDITION_HANDLING', '1'),
 328             ('NT_INST', '0'),
 329             ('WIN32', '100'),
 330             ('_NT1X_', '100'),
 331             ('WINNT', '1'),
 332             ('_WIN32_WINNT', '0x0501'), # minimum required OS version
 333             ('WINVER', '0x0501'),
 334             ('_WIN32_IE', '0x0603'),
 335             ('WIN32_LEAN_AND_MEAN', '1'),
 336             ('DEVL', '1'),
 337             ('__BUILDMACHINE__', 'WinDDK'),
 338             ('FPO', '0'),
 339         ]
 340         if env['build'] in ('debug', 'checked'):
 341             cppdefines += [('DBG', 1)]
 342     if platform == 'wince':
 343         cppdefines += [
 344             '_CRT_SECURE_NO_DEPRECATE',
 345             '_USE_32BIT_TIME_T',
 346             'UNICODE',
 347             '_UNICODE',
 348             ('UNDER_CE', '600'),
 349             ('_WIN32_WCE', '0x600'),
 350             'WINCEOEM',
 351             'WINCEINTERNAL',
 352             'WIN32',
 353             'STRICT',
 354             'x86',
 355             '_X86_',
 356             'INTERNATIONAL',
 357             ('INTLMSG_CODEPAGE', '1252'),
 358         ]
 359     if platform == 'windows':
 360         cppdefines += ['PIPE_SUBSYSTEM_WINDOWS_USER']
 361     if platform == 'winddk':
 362         cppdefines += ['PIPE_SUBSYSTEM_WINDOWS_DISPLAY']
 363     if platform == 'wince':
 364         cppdefines += ['PIPE_SUBSYSTEM_WINDOWS_CE']
 365         cppdefines += ['PIPE_SUBSYSTEM_WINDOWS_CE_OGL']
 366     if env['embedded']:
 367         cppdefines += ['PIPE_SUBSYSTEM_EMBEDDED']
 368     env.Append(CPPDEFINES = cppdefines)
 369
 370     # C compiler options
 371     cflags = [] # C
 372     cxxflags = [] # C++
 373     ccflags = [] # C & C++
 374     if gcc:
 375         ccversion = env['CCVERSION']
 376         if env['build'] == 'debug':
 377             ccflags += ['-O0']
 378         elif ccversion.startswith('4.2.'):
 379             # gcc 4.2.x optimizer is broken
 380             print "warning: gcc 4.2.x optimizer is broken -- disabling optimizations"
 381             ccflags += ['-O0']
 382         else:
 383             ccflags += ['-O3']
 384         ccflags += ['-g3']
 385         if env['build'] in ('checked', 'profile'):
 386             # See http://code.google.com/p/jrfonseca/wiki/Gprof2Dot#Which_options_should_I_pass_to_gcc_when_compiling_for_profiling?
 387             ccflags += [
 388                 '-fno-omit-frame-pointer',
 389                 '-fno-optimize-sibling-calls',
 390             ]
 391         if env['machine'] == 'x86':
 392             ccflags += [
 393                 '-m32',
 394                 #'-march=pentium4',
 395             ]
 396             if distutils.version.LooseVersion(ccversion) >= distutils.version.LooseVersion('4.2') \
 397                and (platform != 'windows' or env['build'] == 'debug' or True):
 398                 # NOTE: We need to ensure stack is realigned given that we
 399                 # produce shared objects, and have no control over the stack
 400                 # alignment policy of the application. Therefore we need
 401                 # -mstackrealign ore -mincoming-stack-boundary=2.
 402                 #
 403                 # XXX: -O and -mstackrealign causes stack corruption on MinGW
 404                 #
 405                 # XXX: We could have SSE without -mstackrealign if we always used
 406                 # __attribute__((force_align_arg_pointer)), but that's not
 407                 # always the case.
 408                 ccflags += [
 409                     '-mstackrealign', # ensure stack is aligned
 410                     '-mmmx', '-msse', '-msse2', # enable SIMD intrinsics
 411                     #'-mfpmath=sse',
 412                 ]
 413             if platform in ['windows', 'darwin']:
 414                 # Workaround http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37216
 415                 ccflags += ['-fno-common']
 416         if env['machine'] == 'x86_64':
 417             ccflags += ['-m64']
 418             if platform == 'darwin':
 419                 ccflags += ['-fno-common']
 420         if env['platform'] != 'windows':
 421             ccflags += ['-fvisibility=hidden']
 422         # See also:
 423         # - http://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html
 424         ccflags += [
 425             '-Wall',
 426             '-Wno-long-long',
 427             '-ffast-math',
 428             '-fmessage-length=0', # be nice to Eclipse
 429         ]
 430         cflags += [
 431             '-Wmissing-prototypes',
 432             '-std=gnu99',
 433         ]
 434         if distutils.version.LooseVersion(ccversion) >= distutils.version.LooseVersion('4.0'):
 435             ccflags += [
 436                 '-Wmissing-field-initializers',
 437             ]
 438         if distutils.version.LooseVersion(ccversion) >= distutils.version.LooseVersion('4.2'):
 439             ccflags += [
 440                 '-Wpointer-arith',
 441             ]
 442             cflags += [
 443                 '-Wdeclaration-after-statement',
 444             ]
 445     if msvc:
 446         # See also:
 447         # - http://msdn.microsoft.com/en-us/library/19z1t1wy.aspx
 448         # - cl /?
 449         if env['build'] == 'debug':
 450             ccflags += [
 451               '/Od', # disable optimizations
 452               '/Oi', # enable intrinsic functions
 453               '/Oy-', # disable frame pointer omission
 454             ]
 455         else:
 456             ccflags += [
 457                 '/O2', # optimize for speed
 458             ]
 459         if env['build'] == 'release':
 460             ccflags += [
 461                 '/GL', # enable whole program optimization
 462             ]
 463         else:
 464             ccflags += [
 465                 '/GL-', # disable whole program optimization
 466             ]
 467         ccflags += [
 468             '/fp:fast', # fast floating point
 469             '/W3', # warning level
 470             #'/Wp64', # enable 64 bit porting warnings
 471         ]
 472         if env['machine'] == 'x86':
 473             ccflags += [
 474                 #'/arch:SSE2', # use the SSE2 instructions
 475             ]
 476         if platform == 'windows':
 477             ccflags += [
 478                 # TODO
 479             ]
 480         if platform == 'winddk':
 481             ccflags += [
 482                 '/Zl', # omit default library name in .OBJ
 483                 '/Zp8', # 8bytes struct member alignment
 484                 '/Gy', # separate functions for linker
 485                 '/Gm-', # disable minimal rebuild
 486                 '/WX', # treat warnings as errors
 487                 '/Gz', # __stdcall Calling convention
 488                 '/GX-', # disable C++ EH
 489                 '/GR-', # disable C++ RTTI
 490                 '/GF', # enable read-only string pooling
 491                 '/G6', # optimize for PPro, P-II, P-III
 492                 '/Ze', # enable extensions
 493                 '/Gi-', # disable incremental compilation
 494                 '/QIfdiv-', # disable Pentium FDIV fix
 495                 '/hotpatch', # prepares an image for hotpatching.
 496                 #'/Z7', #enable old-style debug info
 497             ]
 498         if platform == 'wince':
 499             # See also C:\WINCE600\public\common\oak\misc\makefile.def
 500             ccflags += [
 501                 '/Zl', # omit default library name in .OBJ
 502                 '/GF', # enable read-only string pooling
 503                 '/GR-', # disable C++ RTTI
 504                 '/GS', # enable security checks
 505                 # Allow disabling language conformance to maintain backward compat
 506                 #'/Zc:wchar_t-', # don't force wchar_t as native type, instead of typedef
 507                 #'/Zc:forScope-', # don't enforce Standard C++ for scoping rules
 508                 #'/wd4867',
 509                 #'/wd4430',
 510                 #'/MT',
 511                 #'/U_MT',
 512             ]
 513         # Automatic pdb generation
 514         # See http://scons.tigris.org/issues/show_bug.cgi?id=1656
 515         env.EnsureSConsVersion(0, 98, 0)
 516         env['PDB'] = '${TARGET.base}.pdb'
 517     env.Append(CCFLAGS = ccflags)
 518     env.Append(CFLAGS = cflags)
 519     env.Append(CXXFLAGS = cxxflags)
 520
 521     if env['platform'] == 'windows' and msvc:
 522         # Choose the appropriate MSVC CRT
 523         # http://msdn.microsoft.com/en-us/library/2kzt1wy3.aspx
 524         if env['build'] in ('debug', 'checked'):
 525             env.Append(CCFLAGS = ['/MTd'])
 526             env.Append(SHCCFLAGS = ['/LDd'])
 527         else:
 528             env.Append(CCFLAGS = ['/MT'])
 529             env.Append(SHCCFLAGS = ['/LD'])
 530
 531     # Assembler options
 532     if gcc:
 533         if env['machine'] == 'x86':
 534             env.Append(ASFLAGS = ['-m32'])
 535         if env['machine'] == 'x86_64':
 536             env.Append(ASFLAGS = ['-m64'])
 537
 538     # Linker options
 539     linkflags = []
 540     shlinkflags = []
 541     if gcc:
 542         if env['machine'] == 'x86':
 543             linkflags += ['-m32']
 544         if env['machine'] == 'x86_64':
 545             linkflags += ['-m64']
 546         if env['platform'] not in ('darwin'):
 547             shlinkflags += [
 548                 '-Wl,-Bsymbolic',
 549             ]
 550         # Handle circular dependencies in the libraries
 551         if env['platform'] in ('darwin'):
 552             pass
 553         else:
 554             env['_LIBFLAGS'] = '-Wl,--start-group ' + env['_LIBFLAGS'] + ' -Wl,--end-group'
 555     if msvc:
 556         if env['build'] == 'release':
 557             # enable Link-time Code Generation
 558             linkflags += ['/LTCG']
 559             env.Append(ARFLAGS = ['/LTCG'])
 560     if platform == 'windows' and msvc:
 561         # See also:
 562         # - http://msdn2.microsoft.com/en-us/library/y0zzbyt4.aspx
 563         linkflags += [
 564             '/fixed:no',
 565             '/incremental:no',
 566         ]
 567     if platform == 'winddk':
 568         linkflags += [
 569             '/merge:_PAGE=PAGE',
 570             '/merge:_TEXT=.text',
 571             '/section:INIT,d',
 572             '/opt:ref',
 573             '/opt:icf',
 574             '/ignore:4198,4010,4037,4039,4065,4070,4078,4087,4089,4221',
 575             '/incremental:no',
 576             '/fullbuild',
 577             '/release',
 578             '/nodefaultlib',
 579             '/wx',
 580             '/debug',
 581             '/debugtype:cv',
 582             '/version:5.1',
 583             '/osversion:5.1',
 584             '/functionpadmin:5',
 585             '/safeseh',
 586             '/pdbcompress',
 587             '/stack:0x40000,0x1000',
 588             '/driver',
 589             '/align:0x80',
 590             '/subsystem:native,5.01',
 591             '/base:0x10000',
 592
 593             '/entry:DrvEnableDriver',
 594         ]
 595         if env['build'] != 'release':
 596             linkflags += [
 597                 '/MAP', # http://msdn.microsoft.com/en-us/library/k7xkk3e2.aspx
 598             ]
 599     if platform == 'wince':
 600         linkflags += [
 601             '/nodefaultlib',
 602             #'/incremental:no',
 603             #'/fullbuild',
 604             '/entry:_DllMainCRTStartup',
 605         ]
 606     env.Append(LINKFLAGS = linkflags)
 607     env.Append(SHLINKFLAGS = shlinkflags)
 608
 609     # We have C++ in several libraries, so always link with the C++ compiler
 610     if env['gcc']:
 611         env['LINK'] = env['CXX']
 612
 613     # Default libs
 614     libs = []
 615     if env['platform'] in ('posix', 'linux', 'freebsd', 'darwin'):
 616         libs += ['m', 'pthread', 'dl']
 617     env.Append(LIBS = libs)
 618
 619     # Load tools
 620     env.Tool('lex')
 621     env.Tool('yacc')
 622     if env['llvm']:
 623         env.Tool('llvm')
 624
 625     pkg_config_modules(env, 'x11', ['x11', 'xext'])
 626     pkg_config_modules(env, 'drm', ['libdrm'])
 627     pkg_config_modules(env, 'drm_intel', ['libdrm_intel'])
 628     pkg_config_modules(env, 'drm_radeon', ['libdrm_radeon'])
 629     pkg_config_modules(env, 'xorg', ['xorg-server'])
 630     pkg_config_modules(env, 'kms', ['libkms'])
 631
 632     env['dri'] = env['x11'] and env['drm']
 633
 634     # Custom builders and methods
 635     env.Tool('custom')
 636     createInstallMethods(env)
 637
 638     # for debugging
 639     #print env.Dump()
 640
 641
 642 def exists(env):
 643     return 1