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, "$TARGET -> $SOURCE")
  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     host_machine = os.environ.get('PROCESSOR_ARCHITEW6432', os.environ.get('PROCESSOR_ARCHITECTURE', _platform.machine()))
 199     host_machine = {
 200         'x86': 'x86',
 201         'i386': 'x86',
 202         'i486': 'x86',
 203         'i586': 'x86',
 204         'i686': 'x86',
 205         'ppc' : 'ppc',
 206         'x86_64': 'x86_64',
 207     }.get(host_machine, 'generic')
 208     env['crosscompile'] = platform != host_platform
 209     if machine == 'x86_64' and host_machine != 'x86_64':
 210         env['crosscompile'] = True
 211     env['hostonly'] = False
 212
 213     # Backwards compatability with the debug= profile= options
 214     if env['build'] == 'debug':
 215         if not env['debug']:
 216             print 'scons: warning: debug option is deprecated and will be removed eventually; use instead'
 217             print
 218             print ' scons build=release'
 219             print
 220             env['build'] = 'release'
 221         if env['profile']:
 222             print 'scons: warning: profile option is deprecated and will be removed eventually; use instead'
 223             print
 224             print ' scons build=profile'
 225             print
 226             env['build'] = 'profile'
 227     if False:
 228         # Enforce SConscripts to use the new build variable
 229         env.popitem('debug')
 230         env.popitem('profile')
 231     else:
 232         # Backwards portability with older sconscripts
 233         if env['build'] in ('debug', 'checked'):
 234             env['debug'] = True
 235             env['profile'] = False
 236         if env['build'] == 'profile':
 237             env['debug'] = False
 238             env['profile'] = True
 239         if env['build'] == 'release':
 240             env['debug'] = False
 241             env['profile'] = False
 242
 243     # Put build output in a separate dir, which depends on the current
 244     # configuration. See also http://www.scons.org/wiki/AdvancedBuildExample
 245     build_topdir = 'build'
 246     build_subdir = env['platform']
 247     if env['machine'] != 'generic':
 248         build_subdir += '-' + env['machine']
 249     if env['build'] != 'release':
 250         build_subdir += '-' +  env['build']
 251     build_dir = os.path.join(build_topdir, build_subdir)
 252     # Place the .sconsign file in the build dir too, to avoid issues with
 253     # different scons versions building the same source file
 254     env['build_dir'] = build_dir
 255     env.SConsignFile(os.path.join(build_dir, '.sconsign'))
 256     if 'SCONS_CACHE_DIR' in os.environ:
 257         print 'scons: Using build cache in %s.' % (os.environ['SCONS_CACHE_DIR'],)
 258         env.CacheDir(os.environ['SCONS_CACHE_DIR'])
 259     env['CONFIGUREDIR'] = os.path.join(build_dir, 'conf')
 260     env['CONFIGURELOG'] = os.path.join(os.path.abspath(build_dir), 'config.log')
 261
 262     # Parallel build
 263     if env.GetOption('num_jobs') <= 1:
 264         env.SetOption('num_jobs', num_jobs())
 265
 266     env.Decider('MD5-timestamp')
 267     env.SetOption('max_drift', 60)
 268
 269     # C preprocessor options
 270     cppdefines = []
 271     if env['build'] in ('debug', 'checked'):
 272         cppdefines += ['DEBUG']
 273     else:
 274         cppdefines += ['NDEBUG']
 275     if env['build'] == 'profile':
 276         cppdefines += ['PROFILE']
 277     if platform == 'windows':
 278         cppdefines += [
 279             'WIN32',
 280             '_WINDOWS',
 281             #'_UNICODE',
 282             #'UNICODE',
 283             # http://msdn.microsoft.com/en-us/library/aa383745.aspx
 284             ('_WIN32_WINNT', '0x0601'),
 285             ('WINVER', '0x0601'),
 286         ]
 287         if msvc and env['toolchain'] != 'winddk':
 288             cppdefines += [
 289                 'VC_EXTRALEAN',
 290                 '_USE_MATH_DEFINES',
 291                 '_CRT_SECURE_NO_WARNINGS',
 292                 '_CRT_SECURE_NO_DEPRECATE',
 293                 '_SCL_SECURE_NO_WARNINGS',
 294                 '_SCL_SECURE_NO_DEPRECATE',
 295             ]
 296         if env['build'] in ('debug', 'checked'):
 297             cppdefines += ['_DEBUG']
 298     if env['toolchain'] == 'winddk':
 299         # Mimic WINDDK's builtin flags. See also:
 300         # - WINDDK's bin/makefile.new i386mk.inc for more info.
 301         # - buildchk_wxp_x86.log files, generated by the WINDDK's build
 302         # - http://alter.org.ua/docs/nt_kernel/vc8_proj/
 303         if machine == 'x86':
 304             cppdefines += ['_X86_', 'i386']
 305         if machine == 'x86_64':
 306             cppdefines += ['_AMD64_', 'AMD64']
 307     if platform == 'winddk':
 308         cppdefines += [
 309             'STD_CALL',
 310             ('CONDITION_HANDLING', '1'),
 311             ('NT_INST', '0'),
 312             ('WIN32', '100'),
 313             ('_NT1X_', '100'),
 314             ('WINNT', '1'),
 315             ('_WIN32_WINNT', '0x0501'), # minimum required OS version
 316             ('WINVER', '0x0501'),
 317             ('_WIN32_IE', '0x0603'),
 318             ('WIN32_LEAN_AND_MEAN', '1'),
 319             ('DEVL', '1'),
 320             ('__BUILDMACHINE__', 'WinDDK'),
 321             ('FPO', '0'),
 322         ]
 323         if env['build'] in ('debug', 'checked'):
 324             cppdefines += [('DBG', 1)]
 325     if platform == 'wince':
 326         cppdefines += [
 327             '_CRT_SECURE_NO_DEPRECATE',
 328             '_USE_32BIT_TIME_T',
 329             'UNICODE',
 330             '_UNICODE',
 331             ('UNDER_CE', '600'),
 332             ('_WIN32_WCE', '0x600'),
 333             'WINCEOEM',
 334             'WINCEINTERNAL',
 335             'WIN32',
 336             'STRICT',
 337             'x86',
 338             '_X86_',
 339             'INTERNATIONAL',
 340             ('INTLMSG_CODEPAGE', '1252'),
 341         ]
 342     if platform == 'windows':
 343         cppdefines += ['PIPE_SUBSYSTEM_WINDOWS_USER']
 344     if platform == 'winddk':
 345         cppdefines += ['PIPE_SUBSYSTEM_WINDOWS_DISPLAY']
 346     if platform == 'wince':
 347         cppdefines += ['PIPE_SUBSYSTEM_WINDOWS_CE']
 348         cppdefines += ['PIPE_SUBSYSTEM_WINDOWS_CE_OGL']
 349     if platform == 'embedded':
 350         cppdefines += ['PIPE_OS_EMBEDDED']
 351     env.Append(CPPDEFINES = cppdefines)
 352
 353     # C compiler options
 354     cflags = [] # C
 355     cxxflags = [] # C++
 356     ccflags = [] # C & C++
 357     if gcc:
 358         ccversion = env['CCVERSION']
 359         if env['build'] == 'debug':
 360             ccflags += ['-O0']
 361         elif ccversion.startswith('4.2.'):
 362             # gcc 4.2.x optimizer is broken
 363             print "warning: gcc 4.2.x optimizer is broken -- disabling optimizations"
 364             ccflags += ['-O0']
 365         else:
 366             ccflags += ['-O3']
 367         ccflags += ['-g3']
 368         if env['build'] in ('checked', 'profile'):
 369             # See http://code.google.com/p/jrfonseca/wiki/Gprof2Dot#Which_options_should_I_pass_to_gcc_when_compiling_for_profiling?
 370             ccflags += [
 371                 '-fno-omit-frame-pointer',
 372                 '-fno-optimize-sibling-calls',
 373             ]
 374         if env['machine'] == 'x86':
 375             ccflags += [
 376                 '-m32',
 377                 #'-march=pentium4',
 378             ]
 379             if distutils.version.LooseVersion(ccversion) >= distutils.version.LooseVersion('4.2') \
 380                and (platform != 'windows' or env['build'] == 'debug' or True):
 381                 # NOTE: We need to ensure stack is realigned given that we
 382                 # produce shared objects, and have no control over the stack
 383                 # alignment policy of the application. Therefore we need
 384                 # -mstackrealign ore -mincoming-stack-boundary=2.
 385                 #
 386                 # XXX: -O and -mstackrealign causes stack corruption on MinGW
 387                 #
 388                 # XXX: We could have SSE without -mstackrealign if we always used
 389                 # __attribute__((force_align_arg_pointer)), but that's not
 390                 # always the case.
 391                 ccflags += [
 392                     '-mstackrealign', # ensure stack is aligned
 393                     '-mmmx', '-msse', '-msse2', # enable SIMD intrinsics
 394                     #'-mfpmath=sse',
 395                 ]
 396             if platform in ['windows', 'darwin']:
 397                 # Workaround http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37216
 398                 ccflags += ['-fno-common']
 399         if env['machine'] == 'x86_64':
 400             ccflags += ['-m64']
 401             if platform == 'darwin':
 402                 ccflags += ['-fno-common']
 403         # See also:
 404         # - http://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html
 405         ccflags += [
 406             '-Wall',
 407             '-Wno-long-long',
 408             '-ffast-math',
 409             '-fmessage-length=0', # be nice to Eclipse
 410         ]
 411         cflags += [
 412             '-Wmissing-prototypes',
 413             '-std=gnu99',
 414         ]
 415         if distutils.version.LooseVersion(ccversion) >= distutils.version.LooseVersion('4.0'):
 416             ccflags += [
 417                 '-Wmissing-field-initializers',
 418             ]
 419         if distutils.version.LooseVersion(ccversion) >= distutils.version.LooseVersion('4.2'):
 420             ccflags += [
 421                 '-Werror=pointer-arith',
 422             ]
 423             cflags += [
 424                 '-Werror=declaration-after-statement',
 425             ]
 426     if msvc:
 427         # See also:
 428         # - http://msdn.microsoft.com/en-us/library/19z1t1wy.aspx
 429         # - cl /?
 430         if env['build'] == 'debug':
 431             ccflags += [
 432               '/Od', # disable optimizations
 433               '/Oi', # enable intrinsic functions
 434               '/Oy-', # disable frame pointer omission
 435             ]
 436         else:
 437             ccflags += [
 438                 '/O2', # optimize for speed
 439             ]
 440         if env['build'] == 'release':
 441             ccflags += [
 442                 '/GL', # enable whole program optimization
 443             ]
 444         else:
 445             ccflags += [
 446                 '/GL-', # disable whole program optimization
 447             ]
 448         ccflags += [
 449             '/fp:fast', # fast floating point
 450             '/W3', # warning level
 451             #'/Wp64', # enable 64 bit porting warnings
 452         ]
 453         if env['machine'] == 'x86':
 454             ccflags += [
 455                 #'/arch:SSE2', # use the SSE2 instructions
 456             ]
 457         if platform == 'windows':
 458             ccflags += [
 459                 # TODO
 460             ]
 461         if platform == 'winddk':
 462             ccflags += [
 463                 '/Zl', # omit default library name in .OBJ
 464                 '/Zp8', # 8bytes struct member alignment
 465                 '/Gy', # separate functions for linker
 466                 '/Gm-', # disable minimal rebuild
 467                 '/WX', # treat warnings as errors
 468                 '/Gz', # __stdcall Calling convention
 469                 '/GX-', # disable C++ EH
 470                 '/GR-', # disable C++ RTTI
 471                 '/GF', # enable read-only string pooling
 472                 '/G6', # optimize for PPro, P-II, P-III
 473                 '/Ze', # enable extensions
 474                 '/Gi-', # disable incremental compilation
 475                 '/QIfdiv-', # disable Pentium FDIV fix
 476                 '/hotpatch', # prepares an image for hotpatching.
 477                 #'/Z7', #enable old-style debug info
 478             ]
 479         if platform == 'wince':
 480             # See also C:\WINCE600\public\common\oak\misc\makefile.def
 481             ccflags += [
 482                 '/Zl', # omit default library name in .OBJ
 483                 '/GF', # enable read-only string pooling
 484                 '/GR-', # disable C++ RTTI
 485                 '/GS', # enable security checks
 486                 # Allow disabling language conformance to maintain backward compat
 487                 #'/Zc:wchar_t-', # don't force wchar_t as native type, instead of typedef
 488                 #'/Zc:forScope-', # don't enforce Standard C++ for scoping rules
 489                 #'/wd4867',
 490                 #'/wd4430',
 491                 #'/MT',
 492                 #'/U_MT',
 493             ]
 494         # Automatic pdb generation
 495         # See http://scons.tigris.org/issues/show_bug.cgi?id=1656
 496         env.EnsureSConsVersion(0, 98, 0)
 497         env['PDB'] = '${TARGET.base}.pdb'
 498     env.Append(CCFLAGS = ccflags)
 499     env.Append(CFLAGS = cflags)
 500     env.Append(CXXFLAGS = cxxflags)
 501
 502     if env['platform'] == 'windows' and msvc:
 503         # Choose the appropriate MSVC CRT
 504         # http://msdn.microsoft.com/en-us/library/2kzt1wy3.aspx
 505         if env['build'] in ('debug', 'checked'):
 506             env.Append(CCFLAGS = ['/MTd'])
 507             env.Append(SHCCFLAGS = ['/LDd'])
 508         else:
 509             env.Append(CCFLAGS = ['/MT'])
 510             env.Append(SHCCFLAGS = ['/LD'])
 511
 512     # Assembler options
 513     if gcc:
 514         if env['machine'] == 'x86':
 515             env.Append(ASFLAGS = ['-m32'])
 516         if env['machine'] == 'x86_64':
 517             env.Append(ASFLAGS = ['-m64'])
 518
 519     # Linker options
 520     linkflags = []
 521     shlinkflags = []
 522     if gcc:
 523         if env['machine'] == 'x86':
 524             linkflags += ['-m32']
 525         if env['machine'] == 'x86_64':
 526             linkflags += ['-m64']
 527         if env['platform'] not in ('darwin'):
 528             shlinkflags += [
 529                 '-Wl,-Bsymbolic',
 530             ]
 531         # Handle circular dependencies in the libraries
 532         if env['platform'] in ('darwin'):
 533             pass
 534         else:
 535             env['_LIBFLAGS'] = '-Wl,--start-group ' + env['_LIBFLAGS'] + ' -Wl,--end-group'
 536     if msvc:
 537         if env['build'] == 'release':
 538             # enable Link-time Code Generation
 539             linkflags += ['/LTCG']
 540             env.Append(ARFLAGS = ['/LTCG'])
 541     if platform == 'windows' and msvc:
 542         # See also:
 543         # - http://msdn2.microsoft.com/en-us/library/y0zzbyt4.aspx
 544         linkflags += [
 545             '/fixed:no',
 546             '/incremental:no',
 547         ]
 548     if platform == 'winddk':
 549         linkflags += [
 550             '/merge:_PAGE=PAGE',
 551             '/merge:_TEXT=.text',
 552             '/section:INIT,d',
 553             '/opt:ref',
 554             '/opt:icf',
 555             '/ignore:4198,4010,4037,4039,4065,4070,4078,4087,4089,4221',
 556             '/incremental:no',
 557             '/fullbuild',
 558             '/release',
 559             '/nodefaultlib',
 560             '/wx',
 561             '/debug',
 562             '/debugtype:cv',
 563             '/version:5.1',
 564             '/osversion:5.1',
 565             '/functionpadmin:5',
 566             '/safeseh',
 567             '/pdbcompress',
 568             '/stack:0x40000,0x1000',
 569             '/driver',
 570             '/align:0x80',
 571             '/subsystem:native,5.01',
 572             '/base:0x10000',
 573
 574             '/entry:DrvEnableDriver',
 575         ]
 576         if env['build'] != 'release':
 577             linkflags += [
 578                 '/MAP', # http://msdn.microsoft.com/en-us/library/k7xkk3e2.aspx
 579             ]
 580     if platform == 'wince':
 581         linkflags += [
 582             '/nodefaultlib',
 583             #'/incremental:no',
 584             #'/fullbuild',
 585             '/entry:_DllMainCRTStartup',
 586         ]
 587     env.Append(LINKFLAGS = linkflags)
 588     env.Append(SHLINKFLAGS = shlinkflags)
 589
 590     # We have C++ in several libraries, so always link with the C++ compiler
 591     if env['gcc']:
 592         env['LINK'] = env['CXX']
 593
 594     # Default libs
 595     env.Append(LIBS = [])
 596
 597     # Load tools
 598     if env['llvm']:
 599         env.Tool('llvm')
 600         env.Tool('udis86')
 601
 602     pkg_config_modules(env, 'x11', ['x11', 'xext'])
 603     pkg_config_modules(env, 'drm', ['libdrm'])
 604     pkg_config_modules(env, 'drm_intel', ['libdrm_intel'])
 605     pkg_config_modules(env, 'drm_radeon', ['libdrm_radeon'])
 606     pkg_config_modules(env, 'xorg', ['xorg-server'])
 607     pkg_config_modules(env, 'kms', ['libkms'])
 608
 609     env['dri'] = env['x11'] and env['drm']
 610
 611     # Custom builders and methods
 612     env.Tool('custom')
 613     createInstallMethods(env)
 614
 615     # for debugging
 616     #print env.Dump()
 617
 618
 619 def exists(env):
 620     return 1