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 from __future__ import print_function
  33
  34 import distutils.version
  35 import os
  36 import os.path
  37 import re
  38 import subprocess
  39 import platform as host_platform
  40 import sys
  41 import tempfile
  42
  43 import SCons.Action
  44 import SCons.Builder
  45 import SCons.Scanner
  46
  47
  48 def symlink(target, source, env):
  49     target = str(target[0])
  50     source = str(source[0])
  51     if os.path.islink(target) or os.path.exists(target):
  52         os.remove(target)
  53     os.symlink(os.path.basename(source), target)
  54
  55 def install(env, source, subdir):
  56     target_dir = os.path.join(env.Dir('#.').srcnode().abspath, env['build_dir'], subdir)
  57     return env.Install(target_dir, source)
  58
  59 def install_program(env, source):
  60     return install(env, source, 'bin')
  61
  62 def install_shared_library(env, sources, version = ()):
  63     targets = []
  64     install_dir = os.path.join(env.Dir('#.').srcnode().abspath, env['build_dir'])
  65     version = tuple(map(str, version))
  66     if env['SHLIBSUFFIX'] == '.dll':
  67         dlls = env.FindIxes(sources, 'SHLIBPREFIX', 'SHLIBSUFFIX')
  68         targets += install(env, dlls, 'bin')
  69         libs = env.FindIxes(sources, 'LIBPREFIX', 'LIBSUFFIX')
  70         targets += install(env, libs, 'lib')
  71     else:
  72         for source in sources:
  73             target_dir =  os.path.join(install_dir, 'lib')
  74             target_name = '.'.join((str(source),) + version)
  75             last = env.InstallAs(os.path.join(target_dir, target_name), source)
  76             targets += last
  77             while len(version):
  78                 version = version[:-1]
  79                 target_name = '.'.join((str(source),) + version)
  80                 action = SCons.Action.Action(symlink, "  Symlinking $TARGET ...")
  81                 last = env.Command(os.path.join(target_dir, target_name), last, action)
  82                 targets += last
  83     return targets
  84
  85
  86 def msvc2013_compat(env):
  87     if env['gcc']:
  88         env.Append(CCFLAGS = [
  89             '-Werror=vla',
  90             '-Werror=pointer-arith',
  91         ])
  92
  93
  94 def unit_test(env, test_name, program_target, args=None):
  95     env.InstallProgram(program_target)
  96
  97     cmd = [program_target[0].abspath]
  98     if args is not None:
  99         cmd += args
 100     cmd = ' '.join(cmd)
 101
 102     # http://www.scons.org/wiki/UnitTests
 103     action = SCons.Action.Action(cmd, "  Running $SOURCE ...")
 104     alias = env.Alias(test_name, program_target, action)
 105     env.AlwaysBuild(alias)
 106     env.Depends('check', alias)
 107
 108
 109 def num_jobs():
 110     try:
 111         return int(os.environ['NUMBER_OF_PROCESSORS'])
 112     except (ValueError, KeyError):
 113         pass
 114
 115     try:
 116         return os.sysconf('SC_NPROCESSORS_ONLN')
 117     except (ValueError, OSError, AttributeError):
 118         pass
 119
 120     try:
 121         return int(os.popen2("sysctl -n hw.ncpu")[1].read())
 122     except ValueError:
 123         pass
 124
 125     return 1
 126
 127
 128 def check_cc(env, cc, expr, cpp_opt = '-E'):
 129     # Invoke C-preprocessor to determine whether the specified expression is
 130     # true or not.
 131
 132     sys.stdout.write('Checking for %s ... ' % cc)
 133
 134     source = tempfile.NamedTemporaryFile(suffix='.c', delete=False)
 135     source.write(('#if !(%s)\n#error\n#endif\n' % expr).encode())
 136     source.close()
 137
 138     # sys.stderr.write('%r %s %s\n' % (env['CC'], cpp_opt, source.name));
 139
 140     pipe = SCons.Action._subproc(env, env.Split(env['CC']) + [cpp_opt, source.name],
 141                                  stdin = 'devnull',
 142                                  stderr = 'devnull',
 143                                  stdout = 'devnull')
 144     result = pipe.wait() == 0
 145
 146     os.unlink(source.name)
 147
 148     sys.stdout.write(' %s\n' % ['no', 'yes'][int(bool(result))])
 149     return result
 150
 151 def check_header(env, header):
 152     '''Check if the header exist'''
 153
 154     conf = SCons.Script.Configure(env)
 155     have_header = False
 156
 157     if conf.CheckHeader(header):
 158         have_header = True
 159
 160     env = conf.Finish()
 161     return have_header
 162
 163 def check_functions(env, functions):
 164     '''Check if all of the functions exist'''
 165
 166     conf = SCons.Script.Configure(env)
 167     have_functions = True
 168
 169     for function in functions:
 170         if not conf.CheckFunc(function):
 171             have_functions = False
 172
 173     env = conf.Finish()
 174     return have_functions
 175
 176 def check_prog(env, prog):
 177     """Check whether this program exists."""
 178
 179     sys.stdout.write('Checking for %s ... ' % prog)
 180
 181     result = env.Detect(prog)
 182
 183     sys.stdout.write(' %s\n' % ['no', 'yes'][int(bool(result))])
 184     return result
 185
 186
 187 def generate(env):
 188     """Common environment generation code"""
 189
 190     # Tell tools which machine to compile for
 191     env['TARGET_ARCH'] = env['machine']
 192     env['MSVS_ARCH'] = env['machine']
 193
 194     # Toolchain
 195     platform = env['platform']
 196     env.Tool(env['toolchain'])
 197
 198     # Allow override compiler and specify additional flags from environment
 199     if 'CC' in os.environ:
 200         env['CC'] = os.environ['CC']
 201     if 'CFLAGS' in os.environ:
 202         env['CCFLAGS'] += SCons.Util.CLVar(os.environ['CFLAGS'])
 203     if 'CXX' in os.environ:
 204         env['CXX'] = os.environ['CXX']
 205     if 'CXXFLAGS' in os.environ:
 206         env['CXXFLAGS'] += SCons.Util.CLVar(os.environ['CXXFLAGS'])
 207     if 'LDFLAGS' in os.environ:
 208         env['LINKFLAGS'] += SCons.Util.CLVar(os.environ['LDFLAGS'])
 209
 210     # Detect gcc/clang not by executable name, but through pre-defined macros
 211     # as autoconf does, to avoid drawing wrong conclusions when using tools
 212     # that overrice CC/CXX like scan-build.
 213     env['gcc_compat'] = 0
 214     env['clang'] = 0
 215     env['msvc'] = 0
 216     if host_platform.system() == 'Windows':
 217         env['msvc'] = check_cc(env, 'MSVC', 'defined(_MSC_VER)', '/E')
 218     if not env['msvc']:
 219         env['gcc_compat'] = check_cc(env, 'GCC', 'defined(__GNUC__)')
 220     env['clang'] = check_cc(env, 'Clang', '__clang__')
 221     env['gcc'] = env['gcc_compat'] and not env['clang']
 222     env['suncc'] = env['platform'] == 'sunos' and os.path.basename(env['CC']) == 'cc'
 223     env['icc'] = 'icc' == os.path.basename(env['CC'])
 224
 225     # shortcuts
 226     machine = env['machine']
 227     platform = env['platform']
 228     x86 = env['machine'] == 'x86'
 229     ppc = env['machine'] == 'ppc'
 230     gcc_compat = env['gcc_compat']
 231     msvc = env['msvc']
 232     suncc = env['suncc']
 233     icc = env['icc']
 234
 235     # Determine whether we are cross compiling; in particular, whether we need
 236     # to compile code generators with a different compiler as the target code.
 237     hosthost_platform = host_platform.system().lower()
 238     if hosthost_platform.startswith('cygwin'):
 239         hosthost_platform = 'cygwin'
 240     # Avoid spurious crosscompilation in MSYS2 environment.
 241     if hosthost_platform.startswith('mingw'):
 242         hosthost_platform = 'windows'
 243     host_machine = os.environ.get('PROCESSOR_ARCHITEW6432', os.environ.get('PROCESSOR_ARCHITECTURE', host_platform.machine()))
 244     host_machine = {
 245         'x86': 'x86',
 246         'i386': 'x86',
 247         'i486': 'x86',
 248         'i586': 'x86',
 249         'i686': 'x86',
 250         'ppc' : 'ppc',
 251         'AMD64': 'x86_64',
 252         'x86_64': 'x86_64',
 253     }.get(host_machine, 'generic')
 254     env['crosscompile'] = platform != hosthost_platform
 255     if machine == 'x86_64' and host_machine != 'x86_64':
 256         env['crosscompile'] = True
 257     env['hostonly'] = False
 258
 259     # Backwards compatability with the debug= profile= options
 260     if env['build'] == 'debug':
 261         if not env['debug']:
 262             print('scons: warning: debug option is deprecated and will be removed eventually; use instead')
 263             print('')
 264             print(' scons build=release')
 265             print('')
 266             env['build'] = 'release'
 267         if env['profile']:
 268             print('scons: warning: profile option is deprecated and will be removed eventually; use instead')
 269             print('')
 270             print(' scons build=profile')
 271             print('')
 272             env['build'] = 'profile'
 273     if False:
 274         # Enforce SConscripts to use the new build variable
 275         env.popitem('debug')
 276         env.popitem('profile')
 277     else:
 278         # Backwards portability with older sconscripts
 279         if env['build'] in ('debug', 'checked'):
 280             env['debug'] = True
 281             env['profile'] = False
 282         if env['build'] == 'profile':
 283             env['debug'] = False
 284             env['profile'] = True
 285         if env['build'] == 'release':
 286             env['debug'] = False
 287             env['profile'] = False
 288
 289     # Put build output in a separate dir, which depends on the current
 290     # configuration. See also http://www.scons.org/wiki/AdvancedBuildExample
 291     build_topdir = 'build'
 292     build_subdir = env['platform']
 293     if env['embedded']:
 294         build_subdir =  'embedded-' + build_subdir
 295     if env['machine'] != 'generic':
 296         build_subdir += '-' + env['machine']
 297     if env['build'] != 'release':
 298         build_subdir += '-' +  env['build']
 299     build_dir = os.path.join(build_topdir, build_subdir)
 300     # Place the .sconsign file in the build dir too, to avoid issues with
 301     # different scons versions building the same source file
 302     env['build_dir'] = build_dir
 303     env.SConsignFile(os.path.join(build_dir, '.sconsign'))
 304     if 'SCONS_CACHE_DIR' in os.environ:
 305         print('scons: Using build cache in %s.' % (os.environ['SCONS_CACHE_DIR'],))
 306         env.CacheDir(os.environ['SCONS_CACHE_DIR'])
 307     env['CONFIGUREDIR'] = os.path.join(build_dir, 'conf')
 308     env['CONFIGURELOG'] = os.path.join(os.path.abspath(build_dir), 'config.log')
 309
 310     # Parallel build
 311     if env.GetOption('num_jobs') <= 1:
 312         env.SetOption('num_jobs', num_jobs())
 313
 314     # Speed up dependency checking.  See
 315     # - https://github.com/SCons/scons/wiki/GoFastButton
 316     # - https://bugs.freedesktop.org/show_bug.cgi?id=109443
 317
 318     # Scons version string has consistently been in this format:
 319     # MajorVersion.MinorVersion.Patch[.alpha/beta.yyyymmdd]
 320     # so this formula should cover all versions regardless of type
 321     # stable, alpha or beta.
 322     # For simplicity alpha and beta flags are removed.
 323
 324     scons_version = distutils.version.StrictVersion('.'.join(SCons.__version__.split('.')[:3]))
 325     if scons_version < distutils.version.StrictVersion('3.0.2') or \
 326        scons_version > distutils.version.StrictVersion('3.0.4'):
 327         env.Decider('MD5-timestamp')
 328     env.SetOption('max_drift', 60)
 329
 330     # C preprocessor options
 331     cppdefines = []
 332     cppdefines += [
 333         '__STDC_CONSTANT_MACROS',
 334         '__STDC_FORMAT_MACROS',
 335         '__STDC_LIMIT_MACROS',
 336         'HAVE_SCONS',
 337     ]
 338     if env['build'] in ('debug', 'checked'):
 339         cppdefines += ['DEBUG']
 340     else:
 341         cppdefines += ['NDEBUG']
 342     if env['build'] == 'profile':
 343         cppdefines += ['PROFILE']
 344     if env['platform'] in ('posix', 'linux', 'freebsd', 'darwin'):
 345         cppdefines += [
 346             '_POSIX_SOURCE',
 347             ('_POSIX_C_SOURCE', '199309L'),
 348             '_SVID_SOURCE',
 349             '_BSD_SOURCE',
 350             '_GNU_SOURCE',
 351             '_DEFAULT_SOURCE',
 352         ]
 353         if env['platform'] == 'darwin':
 354             cppdefines += [
 355                 '_DARWIN_C_SOURCE',
 356                 'GLX_USE_APPLEGL',
 357                 'GLX_DIRECT_RENDERING',
 358                 'BUILDING_MESA',
 359             ]
 360         else:
 361             cppdefines += [
 362                 'GLX_DIRECT_RENDERING',
 363                 'GLX_INDIRECT_RENDERING',
 364             ]
 365
 366         if check_header(env, 'xlocale.h'):
 367             cppdefines += ['HAVE_XLOCALE_H']
 368
 369         if check_header(env, 'endian.h'):
 370             cppdefines += ['HAVE_ENDIAN_H']
 371
 372         if check_functions(env, ['strtod_l', 'strtof_l']):
 373             cppdefines += ['HAVE_STRTOD_L']
 374
 375         if check_functions(env, ['random_r']):
 376             cppdefines += ['HAVE_RANDOM_R']
 377
 378         if check_functions(env, ['timespec_get']):
 379             cppdefines += ['HAVE_TIMESPEC_GET']
 380
 381         if check_header(env, 'sys/shm.h'):
 382             cppdefines += ['HAVE_SYS_SHM_H']
 383
 384         if check_functions(env, ['strtok_r']):
 385             cppdefines += ['HAVE_STRTOK_R']
 386
 387         #FIXME: we should really be checking for the major()/minor()
 388         # functions/macros in these headers, but check_functions()'s
 389         # SConf.CheckFunc() doesn't seem to support macros.
 390         if check_header(env, 'sys/mkdev.h'):
 391             cppdefines += ['MAJOR_IN_MKDEV']
 392         if check_header(env, 'sys/sysmacros.h'):
 393             cppdefines += ['MAJOR_IN_SYSMACROS']
 394
 395     if platform == 'windows':
 396         cppdefines += [
 397             'WIN32',
 398             '_WINDOWS',
 399             #'_UNICODE',
 400             #'UNICODE',
 401             # http://msdn.microsoft.com/en-us/library/aa383745.aspx
 402             ('_WIN32_WINNT', '0x0A00'),
 403             ('WINVER', '0x0A00'),
 404         ]
 405         if gcc_compat:
 406             cppdefines += [('__MSVCRT_VERSION__', '0x0700')]
 407         if msvc:
 408             cppdefines += [
 409                 'VC_EXTRALEAN',
 410                 '_USE_MATH_DEFINES',
 411                 '_CRT_SECURE_NO_WARNINGS',
 412                 '_CRT_SECURE_NO_DEPRECATE',
 413                 '_SCL_SECURE_NO_WARNINGS',
 414                 '_SCL_SECURE_NO_DEPRECATE',
 415                 '_ALLOW_KEYWORD_MACROS',
 416                 '_HAS_EXCEPTIONS=0', # Tell C++ STL to not use exceptions
 417             ]
 418         if env['build'] in ('debug', 'checked'):
 419             cppdefines += ['_DEBUG']
 420     if env['embedded']:
 421         cppdefines += ['EMBEDDED_DEVICE']
 422     env.Append(CPPDEFINES = cppdefines)
 423
 424     # C compiler options
 425     cflags = [] # C
 426     cxxflags = [] # C++
 427     ccflags = [] # C & C++
 428     if gcc_compat:
 429         if env['build'] == 'debug':
 430             ccflags += ['-O0']
 431         else:
 432             ccflags += ['-O3']
 433         if env['gcc']:
 434             # gcc's builtin memcmp is slower than glibc's
 435             # http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43052
 436             ccflags += ['-fno-builtin-memcmp']
 437         # Work around aliasing bugs - developers should comment this out
 438         ccflags += ['-fno-strict-aliasing']
 439         ccflags += ['-g']
 440         if env['build'] in ('checked', 'profile') or env['asan']:
 441             # See http://code.google.com/p/jrfonseca/wiki/Gprof2Dot#Which_options_should_I_pass_to_gcc_when_compiling_for_profiling?
 442             ccflags += [
 443                 '-fno-omit-frame-pointer',
 444             ]
 445             if env['gcc']:
 446                 ccflags += ['-fno-optimize-sibling-calls']
 447         if env['machine'] == 'x86':
 448             ccflags += [
 449                 '-m32',
 450                 #'-march=pentium4',
 451             ]
 452             if platform != 'haiku':
 453                 # NOTE: We need to ensure stack is realigned given that we
 454                 # produce shared objects, and have no control over the stack
 455                 # alignment policy of the application. Therefore we need
 456                 # -mstackrealign ore -mincoming-stack-boundary=2.
 457                 #
 458                 # XXX: We could have SSE without -mstackrealign if we always used
 459                 # __attribute__((force_align_arg_pointer)), but that's not
 460                 # always the case.
 461                 ccflags += [
 462                     '-mstackrealign', # ensure stack is aligned
 463                     '-msse', '-msse2', # enable SIMD intrinsics
 464                     '-mfpmath=sse', # generate SSE floating-point arithmetic
 465                 ]
 466             if platform in ['windows', 'darwin']:
 467                 # Workaround http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37216
 468                 ccflags += ['-fno-common']
 469             if platform in ['haiku']:
 470                 # Make optimizations compatible with Pentium or higher on Haiku
 471                 ccflags += [
 472                     '-mstackrealign', # ensure stack is aligned
 473                     '-march=i586', # Haiku target is Pentium
 474                     '-mtune=i686' # use i686 where we can
 475                 ]
 476         if env['machine'] == 'x86_64':
 477             ccflags += ['-m64']
 478             if platform == 'darwin':
 479                 ccflags += ['-fno-common']
 480         if env['platform'] not in ('cygwin', 'haiku', 'windows'):
 481             ccflags += ['-fvisibility=hidden']
 482         # See also:
 483         # - http://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html
 484         ccflags += [
 485             '-Wall',
 486             '-Wno-long-long',
 487             '-fmessage-length=0', # be nice to Eclipse
 488         ]
 489         cflags += [
 490             '-Werror=implicit-function-declaration',
 491             '-Werror=missing-prototypes',
 492             '-Werror=return-type',
 493             '-Werror=incompatible-pointer-types',
 494         ]
 495         if platform == 'darwin' and host_platform.mac_ver()[0] >= '10.15':
 496             cflags += ['-std=gnu11']
 497         else:
 498             cflags += ['-std=gnu99']
 499     if icc:
 500         cflags += [
 501             '-std=gnu99',
 502         ]
 503     if msvc:
 504         # See also:
 505         # - http://msdn.microsoft.com/en-us/library/19z1t1wy.aspx
 506         # - cl /?
 507         if env['build'] == 'debug':
 508             ccflags += [
 509               '/Od', # disable optimizations
 510               '/Oi', # enable intrinsic functions
 511             ]
 512         else:
 513             ccflags += [
 514                 '/O2', # optimize for speed
 515             ]
 516         if env['build'] == 'release':
 517             if not env['clang']:
 518                 ccflags += [
 519                     '/GL', # enable whole program optimization
 520                 ]
 521         else:
 522             ccflags += [
 523                 '/Oy-', # disable frame pointer omission
 524             ]
 525         ccflags += [
 526             '/W3', # warning level
 527             '/wd4018', # signed/unsigned mismatch
 528             '/wd4056', # overflow in floating-point constant arithmetic
 529             '/wd4244', # conversion from 'type1' to 'type2', possible loss of data
 530             '/wd4267', # 'var' : conversion from 'size_t' to 'type', possible loss of data
 531             '/wd4305', # truncation from 'type1' to 'type2'
 532             '/wd4351', # new behavior: elements of array 'array' will be default initialized
 533             '/wd4756', # overflow in constant arithmetic
 534             '/wd4800', # forcing value to bool 'true' or 'false' (performance warning)
 535             '/wd4996', # disable deprecated POSIX name warnings
 536         ]
 537         if env['clang']:
 538             ccflags += [
 539                 '-Wno-microsoft-enum-value', # enumerator value is not representable in underlying type 'int'
 540             ]
 541         if env['machine'] == 'x86':
 542             ccflags += [
 543                 '/arch:SSE2', # use the SSE2 instructions (default since MSVC 2012)
 544             ]
 545         if platform == 'windows':
 546             ccflags += [
 547                 # TODO
 548             ]
 549         # Automatic pdb generation
 550         # See http://scons.tigris.org/issues/show_bug.cgi?id=1656
 551         env.EnsureSConsVersion(0, 98, 0)
 552         env['PDB'] = '${TARGET.base}.pdb'
 553     env.Append(CCFLAGS = ccflags)
 554     env.Append(CFLAGS = cflags)
 555     env.Append(CXXFLAGS = cxxflags)
 556
 557     if env['platform'] == 'windows' and msvc:
 558         # Choose the appropriate MSVC CRT
 559         # http://msdn.microsoft.com/en-us/library/2kzt1wy3.aspx
 560         if env['build'] in ('debug', 'checked'):
 561             env.Append(CCFLAGS = ['/MTd'])
 562             env.Append(SHCCFLAGS = ['/LDd'])
 563         else:
 564             env.Append(CCFLAGS = ['/MT'])
 565             env.Append(SHCCFLAGS = ['/LD'])
 566
 567     # Static code analysis
 568     if env['analyze']:
 569         if env['msvc']:
 570             # http://msdn.microsoft.com/en-us/library/ms173498.aspx
 571             env.Append(CCFLAGS = [
 572                 '/analyze',
 573                 #'/analyze:log', '${TARGET.base}.xml',
 574                 '/wd28251', # Inconsistent annotation for function
 575             ])
 576         if env['clang']:
 577             # scan-build will produce more comprehensive output
 578             env.Append(CCFLAGS = ['--analyze'])
 579
 580     # https://github.com/google/sanitizers/wiki/AddressSanitizer
 581     if env['asan']:
 582         if gcc_compat:
 583             env.Append(CCFLAGS = [
 584                 '-fsanitize=address',
 585             ])
 586             env.Append(LINKFLAGS = [
 587                 '-fsanitize=address',
 588             ])
 589
 590     # Assembler options
 591     if gcc_compat:
 592         if env['machine'] == 'x86':
 593             env.Append(ASFLAGS = ['-m32'])
 594         if env['machine'] == 'x86_64':
 595             env.Append(ASFLAGS = ['-m64'])
 596
 597     # Linker options
 598     linkflags = []
 599     shlinkflags = []
 600     if gcc_compat:
 601         if env['machine'] == 'x86':
 602             linkflags += ['-m32']
 603         if env['machine'] == 'x86_64':
 604             linkflags += ['-m64']
 605         if env['platform'] not in ('darwin'):
 606             shlinkflags += [
 607                 '-Wl,-Bsymbolic',
 608             ]
 609         # Handle circular dependencies in the libraries
 610         if env['platform'] in ('darwin'):
 611             pass
 612         else:
 613             env['_LIBFLAGS'] = '-Wl,--start-group ' + env['_LIBFLAGS'] + ' -Wl,--end-group'
 614         if env['platform'] == 'windows':
 615             linkflags += [
 616                 '-Wl,--nxcompat', # DEP
 617                 '-Wl,--dynamicbase', # ASLR
 618             ]
 619             # Avoid depending on gcc runtime DLLs
 620             linkflags += ['-static-libgcc']
 621             if 'w64' in env['CC'].split('-'):
 622                 linkflags += ['-static-libstdc++']
 623             # Handle the @xx symbol munging of DLL exports
 624             shlinkflags += ['-Wl,--enable-stdcall-fixup']
 625             #shlinkflags += ['-Wl,--kill-at']
 626     if msvc:
 627         if env['build'] == 'release' and not env['clang']:
 628             # enable Link-time Code Generation
 629             linkflags += ['/LTCG']
 630             env.Append(ARFLAGS = ['/LTCG'])
 631     if platform == 'windows' and msvc:
 632         # See also:
 633         # - http://msdn2.microsoft.com/en-us/library/y0zzbyt4.aspx
 634         linkflags += [
 635             '/fixed:no',
 636             '/incremental:no',
 637             '/dynamicbase', # ASLR
 638             '/nxcompat', # DEP
 639         ]
 640     env.Append(LINKFLAGS = linkflags)
 641     env.Append(SHLINKFLAGS = shlinkflags)
 642
 643     # We have C++ in several libraries, so always link with the C++ compiler
 644     if gcc_compat:
 645         env['LINK'] = env['CXX']
 646
 647     # Default libs
 648     libs = []
 649     if env['platform'] in ('darwin', 'freebsd', 'linux', 'posix', 'sunos'):
 650         libs += ['m', 'pthread', 'dl']
 651     if env['platform'] in ('linux',):
 652         libs += ['rt']
 653     if env['platform'] in ('haiku'):
 654         libs += ['root', 'be', 'network', 'translation']
 655     env.Append(LIBS = libs)
 656
 657     # OpenMP
 658     if env['openmp']:
 659         if env['msvc']:
 660             env.Append(CCFLAGS = ['/openmp'])
 661             # When building openmp release VS2008 link.exe crashes with LNK1103 error.
 662             # Workaround: overwrite PDB flags with empty value as it isn't required anyways
 663             if env['build'] == 'release':
 664                 env['PDB'] = ''
 665         if env['gcc']:
 666             env.Append(CCFLAGS = ['-fopenmp'])
 667             env.Append(LIBS = ['gomp'])
 668
 669     # Load tools
 670     env.Tool('lex')
 671     if env['msvc']:
 672         env.Append(LEXFLAGS = [
 673             # Force flex to use const keyword in prototypes, as relies on
 674             # __cplusplus or __STDC__ macro to determine whether it's safe to
 675             # use const keyword, but MSVC never defines __STDC__ unless we
 676             # disable all MSVC extensions.
 677             '-DYY_USE_CONST=',
 678         ])
 679         # Flex relies on __STDC_VERSION__>=199901L to decide when to include
 680         # C99 inttypes.h.  We always have inttypes.h available with MSVC
 681         # (either the one bundled with MSVC 2013, or the one we bundle
 682         # ourselves), but we can't just define __STDC_VERSION__ without
 683         # breaking stuff, as MSVC doesn't fully support C99.  There's also no
 684         # way to premptively include stdint.
 685         env.Append(CCFLAGS = ['-FIinttypes.h'])
 686     if host_platform.system() == 'Windows':
 687         # Prefer winflexbison binaries, as not only they are easier to install
 688         # (no additional dependencies), but also better Windows support.
 689         if check_prog(env, 'win_flex'):
 690             env["LEX"] = 'win_flex'
 691             env.Append(LEXFLAGS = [
 692                 # windows compatibility (uses <io.h> instead of <unistd.h> and
 693                 # _isatty, _fileno functions)
 694                 '--wincompat'
 695             ])
 696
 697     env.Tool('yacc')
 698     if host_platform.system() == 'Windows':
 699         if check_prog(env, 'win_bison'):
 700             env["YACC"] = 'win_bison'
 701
 702     if env['llvm']:
 703         env.Tool('llvm')
 704
 705     # Custom builders and methods
 706     env.Tool('custom')
 707     env.AddMethod(install_program, 'InstallProgram')
 708     env.AddMethod(install_shared_library, 'InstallSharedLibrary')
 709     env.AddMethod(msvc2013_compat, 'MSVC2013Compat')
 710     env.AddMethod(unit_test, 'UnitTest')
 711
 712     env.PkgCheckModules('X11', ['x11', 'xext', 'xdamage >= 1.1', 'xfixes', 'glproto >= 1.4.13', 'dri2proto >= 2.8'])
 713     env.PkgCheckModules('XCB', ['x11-xcb', 'xcb-glx >= 1.8.1', 'xcb-dri2 >= 1.8'])
 714     env.PkgCheckModules('XF86VIDMODE', ['xxf86vm'])
 715     env.PkgCheckModules('DRM', ['libdrm >= 2.4.75'])
 716
 717     if not os.path.exists("src/util/format_srgb.c"):
 718         print("Checking for Python Mako module (>= 0.8.0)... ", end='')
 719         try:
 720             import mako
 721         except ImportError:
 722             print("no")
 723             exit(1)
 724         if distutils.version.StrictVersion(mako.__version__) < distutils.version.StrictVersion('0.8.0'):
 725             print("no")
 726             exit(1)
 727         print("yes")
 728
 729     if env['x11']:
 730         env.Append(CPPPATH = env['X11_CPPPATH'])
 731
 732     env['dri'] = env['x11'] and env['drm']
 733
 734     # for debugging
 735     #print env.Dump()
 736
 737
 738 def exists(env):
 739     return 1