scons/gallium.py

   1 """gallium
   2
   3 Frontend-tool for Gallium3D architecture.
   4
   5 """
   6
   7 #
   8 # Copyright 2008 VMware, Inc.
   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 VMWARE 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 host_platform
  39 import sys
  40 import tempfile
  41
  42 import SCons.Action
  43 import SCons.Builder
  44 import SCons.Scanner
  45
  46
  47 def symlink(target, source, env):
  48     target = str(target[0])
  49     source = str(source[0])
  50     if os.path.islink(target) or os.path.exists(target):
  51         os.remove(target)
  52     os.symlink(os.path.basename(source), target)
  53
  54 def install(env, source, subdir):
  55     target_dir = os.path.join(env.Dir('#.').srcnode().abspath, env['build_dir'], subdir)
  56     return env.Install(target_dir, source)
  57
  58 def install_program(env, source):
  59     return install(env, source, 'bin')
  60
  61 def install_shared_library(env, sources, version = ()):
  62     targets = []
  63     install_dir = os.path.join(env.Dir('#.').srcnode().abspath, env['build_dir'])
  64     version = tuple(map(str, version))
  65     if env['SHLIBSUFFIX'] == '.dll':
  66         dlls = env.FindIxes(sources, 'SHLIBPREFIX', 'SHLIBSUFFIX')
  67         targets += install(env, dlls, 'bin')
  68         libs = env.FindIxes(sources, 'LIBPREFIX', 'LIBSUFFIX')
  69         targets += install(env, libs, 'lib')
  70     else:
  71         for source in sources:
  72             target_dir =  os.path.join(install_dir, 'lib')
  73             target_name = '.'.join((str(source),) + version)
  74             last = env.InstallAs(os.path.join(target_dir, target_name), source)
  75             targets += last
  76             while len(version):
  77                 version = version[:-1]
  78                 target_name = '.'.join((str(source),) + version)
  79                 action = SCons.Action.Action(symlink, "  Symlinking $TARGET ...")
  80                 last = env.Command(os.path.join(target_dir, target_name), last, action)
  81                 targets += last
  82     return targets
  83
  84
  85 def msvc2013_compat(env):
  86     if env['gcc']:
  87         env.Append(CCFLAGS = [
  88             '-Werror=vla',
  89             '-Werror=pointer-arith',
  90         ])
  91
  92
  93 def unit_test(env, test_name, program_target, args=None):
  94     env.InstallProgram(program_target)
  95
  96     cmd = [program_target[0].abspath]
  97     if args is not None:
  98         cmd += args
  99     cmd = ' '.join(cmd)
 100
 101     # http://www.scons.org/wiki/UnitTests
 102     action = SCons.Action.Action(cmd, "  Running $SOURCE ...")
 103     alias = env.Alias(test_name, program_target, action)
 104     env.AlwaysBuild(alias)
 105     env.Depends('check', alias)
 106
 107
 108 def num_jobs():
 109     try:
 110         return int(os.environ['NUMBER_OF_PROCESSORS'])
 111     except (ValueError, KeyError):
 112         pass
 113
 114     try:
 115         return os.sysconf('SC_NPROCESSORS_ONLN')
 116     except (ValueError, OSError, AttributeError):
 117         pass
 118
 119     try:
 120         return int(os.popen2("sysctl -n hw.ncpu")[1].read())
 121     except ValueError:
 122         pass
 123
 124     return 1
 125
 126
 127 def check_cc(env, cc, expr, cpp_opt = '-E'):
 128     # Invoke C-preprocessor to determine whether the specified expression is
 129     # true or not.
 130
 131     sys.stdout.write('Checking for %s ... ' % cc)
 132
 133     source = tempfile.NamedTemporaryFile(suffix='.c', delete=False)
 134     source.write('#if !(%s)\n#error\n#endif\n' % expr)
 135     source.close()
 136
 137     pipe = SCons.Action._subproc(env, [env['CC'], cpp_opt, source.name],
 138                                  stdin = 'devnull',
 139                                  stderr = 'devnull',
 140                                  stdout = 'devnull')
 141     result = pipe.wait() == 0
 142
 143     os.unlink(source.name)
 144
 145     sys.stdout.write(' %s\n' % ['no', 'yes'][int(bool(result))])
 146     return result
 147
 148 def check_header(env, header):
 149     '''Check if the header exist'''
 150
 151     conf = SCons.Script.Configure(env)
 152     have_header = False
 153
 154     if conf.CheckHeader(header):
 155         have_header = True
 156
 157     env = conf.Finish()
 158     return have_header
 159
 160 def check_prog(env, prog):
 161     """Check whether this program exists."""
 162
 163     sys.stdout.write('Checking for %s ... ' % prog)
 164
 165     result = env.Detect(prog)
 166
 167     sys.stdout.write(' %s\n' % ['no', 'yes'][int(bool(result))])
 168     return result
 169
 170
 171 def generate(env):
 172     """Common environment generation code"""
 173
 174     # Tell tools which machine to compile for
 175     env['TARGET_ARCH'] = env['machine']
 176     env['MSVS_ARCH'] = env['machine']
 177
 178     # Toolchain
 179     platform = env['platform']
 180     env.Tool(env['toolchain'])
 181
 182     # Allow override compiler and specify additional flags from environment
 183     if os.environ.has_key('CC'):
 184         env['CC'] = os.environ['CC']
 185     if os.environ.has_key('CFLAGS'):
 186         env['CCFLAGS'] += SCons.Util.CLVar(os.environ['CFLAGS'])
 187     if os.environ.has_key('CXX'):
 188         env['CXX'] = os.environ['CXX']
 189     if os.environ.has_key('CXXFLAGS'):
 190         env['CXXFLAGS'] += SCons.Util.CLVar(os.environ['CXXFLAGS'])
 191     if os.environ.has_key('LDFLAGS'):
 192         env['LINKFLAGS'] += SCons.Util.CLVar(os.environ['LDFLAGS'])
 193
 194     # Detect gcc/clang not by executable name, but through pre-defined macros
 195     # as autoconf does, to avoid drawing wrong conclusions when using tools
 196     # that overrice CC/CXX like scan-build.
 197     env['gcc_compat'] = 0
 198     env['clang'] = 0
 199     env['msvc'] = 0
 200     if host_platform.system() == 'Windows':
 201         env['msvc'] = check_cc(env, 'MSVC', 'defined(_MSC_VER)', '/E')
 202     if not env['msvc']:
 203         env['gcc_compat'] = check_cc(env, 'GCC', 'defined(__GNUC__)')
 204     env['clang'] = check_cc(env, 'Clang', '__clang__')
 205     env['gcc'] = env['gcc_compat'] and not env['clang']
 206     env['suncc'] = env['platform'] == 'sunos' and os.path.basename(env['CC']) == 'cc'
 207     env['icc'] = 'icc' == os.path.basename(env['CC'])
 208
 209     if env['msvc'] and env['toolchain'] == 'default' and env['machine'] == 'x86_64':
 210         # MSVC x64 support is broken in earlier versions of scons
 211         env.EnsurePythonVersion(2, 0)
 212
 213     # shortcuts
 214     machine = env['machine']
 215     platform = env['platform']
 216     x86 = env['machine'] == 'x86'
 217     ppc = env['machine'] == 'ppc'
 218     gcc_compat = env['gcc_compat']
 219     msvc = env['msvc']
 220     suncc = env['suncc']
 221     icc = env['icc']
 222
 223     # Determine whether we are cross compiling; in particular, whether we need
 224     # to compile code generators with a different compiler as the target code.
 225     hosthost_platform = host_platform.system().lower()
 226     if hosthost_platform.startswith('cygwin'):
 227         hosthost_platform = 'cygwin'
 228     host_machine = os.environ.get('PROCESSOR_ARCHITEW6432', os.environ.get('PROCESSOR_ARCHITECTURE', host_platform.machine()))
 229     host_machine = {
 230         'x86': 'x86',
 231         'i386': 'x86',
 232         'i486': 'x86',
 233         'i586': 'x86',
 234         'i686': 'x86',
 235         'ppc' : 'ppc',
 236         'AMD64': 'x86_64',
 237         'x86_64': 'x86_64',
 238     }.get(host_machine, 'generic')
 239     env['crosscompile'] = platform != hosthost_platform
 240     if machine == 'x86_64' and host_machine != 'x86_64':
 241         env['crosscompile'] = True
 242     env['hostonly'] = False
 243
 244     # Backwards compatability with the debug= profile= options
 245     if env['build'] == 'debug':
 246         if not env['debug']:
 247             print 'scons: warning: debug option is deprecated and will be removed eventually; use instead'
 248             print
 249             print ' scons build=release'
 250             print
 251             env['build'] = 'release'
 252         if env['profile']:
 253             print 'scons: warning: profile option is deprecated and will be removed eventually; use instead'
 254             print
 255             print ' scons build=profile'
 256             print
 257             env['build'] = 'profile'
 258     if False:
 259         # Enforce SConscripts to use the new build variable
 260         env.popitem('debug')
 261         env.popitem('profile')
 262     else:
 263         # Backwards portability with older sconscripts
 264         if env['build'] in ('debug', 'checked'):
 265             env['debug'] = True
 266             env['profile'] = False
 267         if env['build'] == 'profile':
 268             env['debug'] = False
 269             env['profile'] = True
 270         if env['build'] in ('release', 'opt'):
 271             env['debug'] = False
 272             env['profile'] = False
 273
 274     # Put build output in a separate dir, which depends on the current
 275     # configuration. See also http://www.scons.org/wiki/AdvancedBuildExample
 276     build_topdir = 'build'
 277     build_subdir = env['platform']
 278     if env['embedded']:
 279         build_subdir =  'embedded-' + build_subdir
 280     if env['machine'] != 'generic':
 281         build_subdir += '-' + env['machine']
 282     if env['build'] != 'release':
 283         build_subdir += '-' +  env['build']
 284     build_dir = os.path.join(build_topdir, build_subdir)
 285     # Place the .sconsign file in the build dir too, to avoid issues with
 286     # different scons versions building the same source file
 287     env['build_dir'] = build_dir
 288     env.SConsignFile(os.path.join(build_dir, '.sconsign'))
 289     if 'SCONS_CACHE_DIR' in os.environ:
 290         print 'scons: Using build cache in %s.' % (os.environ['SCONS_CACHE_DIR'],)
 291         env.CacheDir(os.environ['SCONS_CACHE_DIR'])
 292     env['CONFIGUREDIR'] = os.path.join(build_dir, 'conf')
 293     env['CONFIGURELOG'] = os.path.join(os.path.abspath(build_dir), 'config.log')
 294
 295     # Parallel build
 296     if env.GetOption('num_jobs') <= 1:
 297         env.SetOption('num_jobs', num_jobs())
 298
 299     env.Decider('MD5-timestamp')
 300     env.SetOption('max_drift', 60)
 301
 302     # C preprocessor options
 303     cppdefines = []
 304     cppdefines += [
 305         '__STDC_CONSTANT_MACROS',
 306         '__STDC_FORMAT_MACROS',
 307         '__STDC_LIMIT_MACROS',
 308         'HAVE_NO_AUTOCONF',
 309     ]
 310     if env['build'] in ('debug', 'checked'):
 311         cppdefines += ['DEBUG']
 312     else:
 313         cppdefines += ['NDEBUG']
 314     if env['build'] == 'profile':
 315         cppdefines += ['PROFILE']
 316     if env['build'] in ('opt', 'profile'):
 317         cppdefines += ['VMX86_STATS']
 318     if env['platform'] in ('posix', 'linux', 'freebsd', 'darwin'):
 319         cppdefines += [
 320             '_POSIX_SOURCE',
 321             ('_POSIX_C_SOURCE', '199309L'),
 322             '_SVID_SOURCE',
 323             '_BSD_SOURCE',
 324             '_GNU_SOURCE',
 325             '_DEFAULT_SOURCE',
 326         ]
 327         if env['platform'] == 'darwin':
 328             cppdefines += [
 329                 '_DARWIN_C_SOURCE',
 330                 'GLX_USE_APPLEGL',
 331                 'GLX_DIRECT_RENDERING',
 332             ]
 333         else:
 334             cppdefines += [
 335                 'GLX_DIRECT_RENDERING',
 336                 'GLX_INDIRECT_RENDERING',
 337             ]
 338
 339         if check_header(env, 'xlocale.h'):
 340             cppdefines += ['HAVE_XLOCALE_H']
 341
 342     if platform == 'windows':
 343         cppdefines += [
 344             'WIN32',
 345             '_WINDOWS',
 346             #'_UNICODE',
 347             #'UNICODE',
 348             # http://msdn.microsoft.com/en-us/library/aa383745.aspx
 349             ('_WIN32_WINNT', '0x0601'),
 350             ('WINVER', '0x0601'),
 351         ]
 352         if gcc_compat:
 353             cppdefines += [('__MSVCRT_VERSION__', '0x0700')]
 354         if msvc:
 355             cppdefines += [
 356                 'VC_EXTRALEAN',
 357                 '_USE_MATH_DEFINES',
 358                 '_CRT_SECURE_NO_WARNINGS',
 359                 '_CRT_SECURE_NO_DEPRECATE',
 360                 '_SCL_SECURE_NO_WARNINGS',
 361                 '_SCL_SECURE_NO_DEPRECATE',
 362                 '_ALLOW_KEYWORD_MACROS',
 363                 '_HAS_EXCEPTIONS=0', # Tell C++ STL to not use exceptions
 364             ]
 365         if env['build'] in ('debug', 'checked'):
 366             cppdefines += ['_DEBUG']
 367     if platform == 'windows':
 368         cppdefines += ['PIPE_SUBSYSTEM_WINDOWS_USER']
 369     if env['embedded']:
 370         cppdefines += ['PIPE_SUBSYSTEM_EMBEDDED']
 371     if env['texture_float']:
 372         print 'warning: Floating-point textures enabled.'
 373         print 'warning: Please consult docs/patents.txt with your lawyer before building Mesa.'
 374         cppdefines += ['TEXTURE_FLOAT_ENABLED']
 375     env.Append(CPPDEFINES = cppdefines)
 376
 377     # C compiler options
 378     cflags = [] # C
 379     cxxflags = [] # C++
 380     ccflags = [] # C & C++
 381     if gcc_compat:
 382         if env['build'] == 'debug':
 383             ccflags += ['-O0']
 384         else:
 385             ccflags += ['-O3']
 386         if env['gcc']:
 387             # gcc's builtin memcmp is slower than glibc's
 388             # http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43052
 389             ccflags += ['-fno-builtin-memcmp']
 390         # Work around aliasing bugs - developers should comment this out
 391         ccflags += ['-fno-strict-aliasing']
 392         ccflags += ['-g']
 393         if env['build'] in ('checked', 'profile') or env['asan']:
 394             # See http://code.google.com/p/jrfonseca/wiki/Gprof2Dot#Which_options_should_I_pass_to_gcc_when_compiling_for_profiling?
 395             ccflags += [
 396                 '-fno-omit-frame-pointer',
 397             ]
 398             if env['gcc']:
 399                 ccflags += ['-fno-optimize-sibling-calls']
 400         if env['machine'] == 'x86':
 401             ccflags += [
 402                 '-m32',
 403                 #'-march=pentium4',
 404             ]
 405             if platform != 'haiku':
 406                 # NOTE: We need to ensure stack is realigned given that we
 407                 # produce shared objects, and have no control over the stack
 408                 # alignment policy of the application. Therefore we need
 409                 # -mstackrealign ore -mincoming-stack-boundary=2.
 410                 #
 411                 # XXX: We could have SSE without -mstackrealign if we always used
 412                 # __attribute__((force_align_arg_pointer)), but that's not
 413                 # always the case.
 414                 ccflags += [
 415                     '-mstackrealign', # ensure stack is aligned
 416                     '-msse', '-msse2', # enable SIMD intrinsics
 417                     '-mfpmath=sse', # generate SSE floating-point arithmetic
 418                 ]
 419             if platform in ['windows', 'darwin']:
 420                 # Workaround http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37216
 421                 ccflags += ['-fno-common']
 422             if platform in ['haiku']:
 423                 # Make optimizations compatible with Pentium or higher on Haiku
 424                 ccflags += [
 425                     '-mstackrealign', # ensure stack is aligned
 426                     '-march=i586', # Haiku target is Pentium
 427                     '-mtune=i686' # use i686 where we can
 428                 ]
 429         if env['machine'] == 'x86_64':
 430             ccflags += ['-m64']
 431             if platform == 'darwin':
 432                 ccflags += ['-fno-common']
 433         if env['platform'] not in ('cygwin', 'haiku', 'windows'):
 434             ccflags += ['-fvisibility=hidden']
 435         # See also:
 436         # - http://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html
 437         ccflags += [
 438             '-Wall',
 439             '-Wno-long-long',
 440             '-fmessage-length=0', # be nice to Eclipse
 441         ]
 442         cflags += [
 443             '-Wmissing-prototypes',
 444             '-std=gnu99',
 445         ]
 446     if icc:
 447         cflags += [
 448             '-std=gnu99',
 449         ]
 450     if msvc:
 451         # See also:
 452         # - http://msdn.microsoft.com/en-us/library/19z1t1wy.aspx
 453         # - cl /?
 454         if env['build'] == 'debug':
 455             ccflags += [
 456               '/Od', # disable optimizations
 457               '/Oi', # enable intrinsic functions
 458             ]
 459         else:
 460             ccflags += [
 461                 '/O2', # optimize for speed
 462             ]
 463         if env['build'] in ('release', 'opt'):
 464             if not env['clang']:
 465                 ccflags += [
 466                     '/GL', # enable whole program optimization
 467                 ]
 468         else:
 469             ccflags += [
 470                 '/Oy-', # disable frame pointer omission
 471             ]
 472         ccflags += [
 473             '/W3', # warning level
 474             '/wd4018', # signed/unsigned mismatch
 475             '/wd4056', # overflow in floating-point constant arithmetic
 476             '/wd4244', # conversion from 'type1' to 'type2', possible loss of data
 477             '/wd4267', # 'var' : conversion from 'size_t' to 'type', possible loss of data
 478             '/wd4305', # truncation from 'type1' to 'type2'
 479             '/wd4351', # new behavior: elements of array 'array' will be default initialized
 480             '/wd4756', # overflow in constant arithmetic
 481             '/wd4800', # forcing value to bool 'true' or 'false' (performance warning)
 482             '/wd4996', # disable deprecated POSIX name warnings
 483         ]
 484         if env['clang']:
 485             ccflags += [
 486                 '-Wno-microsoft-enum-value', # enumerator value is not representable in underlying type 'int'
 487             ]
 488         if env['machine'] == 'x86':
 489             ccflags += [
 490                 '/arch:SSE2', # use the SSE2 instructions (default since MSVC 2012)
 491             ]
 492         if platform == 'windows':
 493             ccflags += [
 494                 # TODO
 495             ]
 496         # Automatic pdb generation
 497         # See http://scons.tigris.org/issues/show_bug.cgi?id=1656
 498         env.EnsureSConsVersion(0, 98, 0)
 499         env['PDB'] = '${TARGET.base}.pdb'
 500     env.Append(CCFLAGS = ccflags)
 501     env.Append(CFLAGS = cflags)
 502     env.Append(CXXFLAGS = cxxflags)
 503
 504     if env['platform'] == 'windows' and msvc:
 505         # Choose the appropriate MSVC CRT
 506         # http://msdn.microsoft.com/en-us/library/2kzt1wy3.aspx
 507         if env['build'] in ('debug', 'checked'):
 508             env.Append(CCFLAGS = ['/MTd'])
 509             env.Append(SHCCFLAGS = ['/LDd'])
 510         else:
 511             env.Append(CCFLAGS = ['/MT'])
 512             env.Append(SHCCFLAGS = ['/LD'])
 513
 514     # Static code analysis
 515     if env['analyze']:
 516         if env['msvc']:
 517             # http://msdn.microsoft.com/en-us/library/ms173498.aspx
 518             env.Append(CCFLAGS = [
 519                 '/analyze',
 520                 #'/analyze:log', '${TARGET.base}.xml',
 521                 '/wd28251', # Inconsistent annotation for function
 522             ])
 523         if env['clang']:
 524             # scan-build will produce more comprehensive output
 525             env.Append(CCFLAGS = ['--analyze'])
 526
 527     # https://github.com/google/sanitizers/wiki/AddressSanitizer
 528     if env['asan']:
 529         if gcc_compat:
 530             env.Append(CCFLAGS = [
 531                 '-fsanitize=address',
 532             ])
 533             env.Append(LINKFLAGS = [
 534                 '-fsanitize=address',
 535             ])
 536
 537     # Assembler options
 538     if gcc_compat:
 539         if env['machine'] == 'x86':
 540             env.Append(ASFLAGS = ['-m32'])
 541         if env['machine'] == 'x86_64':
 542             env.Append(ASFLAGS = ['-m64'])
 543
 544     # Linker options
 545     linkflags = []
 546     shlinkflags = []
 547     if gcc_compat:
 548         if env['machine'] == 'x86':
 549             linkflags += ['-m32']
 550         if env['machine'] == 'x86_64':
 551             linkflags += ['-m64']
 552         if env['platform'] not in ('darwin'):
 553             shlinkflags += [
 554                 '-Wl,-Bsymbolic',
 555             ]
 556         # Handle circular dependencies in the libraries
 557         if env['platform'] in ('darwin'):
 558             pass
 559         else:
 560             env['_LIBFLAGS'] = '-Wl,--start-group ' + env['_LIBFLAGS'] + ' -Wl,--end-group'
 561         if env['platform'] == 'windows':
 562             linkflags += [
 563                 '-Wl,--nxcompat', # DEP
 564                 '-Wl,--dynamicbase', # ASLR
 565             ]
 566             # Avoid depending on gcc runtime DLLs
 567             linkflags += ['-static-libgcc']
 568             if 'w64' in env['CC'].split('-'):
 569                 linkflags += ['-static-libstdc++']
 570             # Handle the @xx symbol munging of DLL exports
 571             shlinkflags += ['-Wl,--enable-stdcall-fixup']
 572             #shlinkflags += ['-Wl,--kill-at']
 573     if msvc:
 574         if env['build'] in ('release', 'opt') and not env['clang']:
 575             # enable Link-time Code Generation
 576             linkflags += ['/LTCG']
 577             env.Append(ARFLAGS = ['/LTCG'])
 578     if platform == 'windows' and msvc:
 579         # See also:
 580         # - http://msdn2.microsoft.com/en-us/library/y0zzbyt4.aspx
 581         linkflags += [
 582             '/fixed:no',
 583             '/incremental:no',
 584             '/dynamicbase', # ASLR
 585             '/nxcompat', # DEP
 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 gcc_compat:
 592         env['LINK'] = env['CXX']
 593
 594     # Default libs
 595     libs = []
 596     if env['platform'] in ('darwin', 'freebsd', 'linux', 'posix', 'sunos'):
 597         libs += ['m', 'pthread', 'dl']
 598     if env['platform'] in ('linux',):
 599         libs += ['rt']
 600     if env['platform'] in ('haiku'):
 601         libs += ['root', 'be', 'network', 'translation']
 602     env.Append(LIBS = libs)
 603
 604     # OpenMP
 605     if env['openmp']:
 606         if env['msvc']:
 607             env.Append(CCFLAGS = ['/openmp'])
 608             # When building openmp release VS2008 link.exe crashes with LNK1103 error.
 609             # Workaround: overwrite PDB flags with empty value as it isn't required anyways
 610             if env['build'] == 'release':
 611                 env['PDB'] = ''
 612         if env['gcc']:
 613             env.Append(CCFLAGS = ['-fopenmp'])
 614             env.Append(LIBS = ['gomp'])
 615
 616     # Load tools
 617     env.Tool('lex')
 618     if env['msvc']:
 619         env.Append(LEXFLAGS = [
 620             # Force flex to use const keyword in prototypes, as relies on
 621             # __cplusplus or __STDC__ macro to determine whether it's safe to
 622             # use const keyword, but MSVC never defines __STDC__ unless we
 623             # disable all MSVC extensions.
 624             '-DYY_USE_CONST=',
 625         ])
 626         # Flex relies on __STDC_VERSION__>=199901L to decide when to include
 627         # C99 inttypes.h.  We always have inttypes.h available with MSVC
 628         # (either the one bundled with MSVC 2013, or the one we bundle
 629         # ourselves), but we can't just define __STDC_VERSION__ without
 630         # breaking stuff, as MSVC doesn't fully support C99.  There's also no
 631         # way to premptively include stdint.
 632         env.Append(CCFLAGS = ['-FIinttypes.h'])
 633     if host_platform.system() == 'Windows':
 634         # Prefer winflexbison binaries, as not only they are easier to install
 635         # (no additional dependencies), but also better Windows support.
 636         if check_prog(env, 'win_flex'):
 637             env["LEX"] = 'win_flex'
 638             env.Append(LEXFLAGS = [
 639                 # windows compatibility (uses <io.h> instead of <unistd.h> and
 640                 # _isatty, _fileno functions)
 641                 '--wincompat'
 642             ])
 643
 644     env.Tool('yacc')
 645     if host_platform.system() == 'Windows':
 646         if check_prog(env, 'win_bison'):
 647             env["YACC"] = 'win_bison'
 648
 649     if env['llvm']:
 650         env.Tool('llvm')
 651
 652     # Custom builders and methods
 653     env.Tool('custom')
 654     env.AddMethod(install_program, 'InstallProgram')
 655     env.AddMethod(install_shared_library, 'InstallSharedLibrary')
 656     env.AddMethod(msvc2013_compat, 'MSVC2013Compat')
 657     env.AddMethod(unit_test, 'UnitTest')
 658
 659     env.PkgCheckModules('X11', ['x11', 'xext', 'xdamage >= 1.1', 'xfixes', 'glproto >= 1.4.13', 'dri2proto >= 2.8'])
 660     env.PkgCheckModules('XCB', ['x11-xcb', 'xcb-glx >= 1.8.1', 'xcb-dri2 >= 1.8'])
 661     env.PkgCheckModules('XF86VIDMODE', ['xxf86vm'])
 662     env.PkgCheckModules('DRM', ['libdrm >= 2.4.75'])
 663
 664     if env['x11']:
 665         env.Append(CPPPATH = env['X11_CPPPATH'])
 666
 667     env['dri'] = env['x11'] and env['drm']
 668
 669     # for debugging
 670     #print env.Dump()
 671
 672
 673 def exists(env):
 674     return 1