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     # sys.stderr.write('%r %s %s\n' % (env['CC'], cpp_opt, source.name));
 138
 139     pipe = SCons.Action._subproc(env, env.Split(env['CC']) + [cpp_opt, source.name],
 140                                  stdin = 'devnull',
 141                                  stderr = 'devnull',
 142                                  stdout = 'devnull')
 143     result = pipe.wait() == 0
 144
 145     os.unlink(source.name)
 146
 147     sys.stdout.write(' %s\n' % ['no', 'yes'][int(bool(result))])
 148     return result
 149
 150 def check_header(env, header):
 151     '''Check if the header exist'''
 152
 153     conf = SCons.Script.Configure(env)
 154     have_header = False
 155
 156     if conf.CheckHeader(header):
 157         have_header = True
 158
 159     env = conf.Finish()
 160     return have_header
 161
 162 def check_functions(env, functions):
 163     '''Check if all of the functions exist'''
 164
 165     conf = SCons.Script.Configure(env)
 166     have_functions = True
 167
 168     for function in functions:
 169         if not conf.CheckFunc(function):
 170             have_functions = False
 171
 172     env = conf.Finish()
 173     return have_functions
 174
 175 def check_prog(env, prog):
 176     """Check whether this program exists."""
 177
 178     sys.stdout.write('Checking for %s ... ' % prog)
 179
 180     result = env.Detect(prog)
 181
 182     sys.stdout.write(' %s\n' % ['no', 'yes'][int(bool(result))])
 183     return result
 184
 185
 186 def generate(env):
 187     """Common environment generation code"""
 188
 189     # Tell tools which machine to compile for
 190     env['TARGET_ARCH'] = env['machine']
 191     env['MSVS_ARCH'] = env['machine']
 192
 193     # Toolchain
 194     platform = env['platform']
 195     env.Tool(env['toolchain'])
 196
 197     # Allow override compiler and specify additional flags from environment
 198     if 'CC' in os.environ:
 199         env['CC'] = os.environ['CC']
 200     if 'CFLAGS' in os.environ:
 201         env['CCFLAGS'] += SCons.Util.CLVar(os.environ['CFLAGS'])
 202     if 'CXX' in os.environ:
 203         env['CXX'] = os.environ['CXX']
 204     if 'CXXFLAGS' in os.environ:
 205         env['CXXFLAGS'] += SCons.Util.CLVar(os.environ['CXXFLAGS'])
 206     if 'LDFLAGS' in os.environ:
 207         env['LINKFLAGS'] += SCons.Util.CLVar(os.environ['LDFLAGS'])
 208
 209     # Detect gcc/clang not by executable name, but through pre-defined macros
 210     # as autoconf does, to avoid drawing wrong conclusions when using tools
 211     # that overrice CC/CXX like scan-build.
 212     env['gcc_compat'] = 0
 213     env['clang'] = 0
 214     env['msvc'] = 0
 215     if host_platform.system() == 'Windows':
 216         env['msvc'] = check_cc(env, 'MSVC', 'defined(_MSC_VER)', '/E')
 217     if not env['msvc']:
 218         env['gcc_compat'] = check_cc(env, 'GCC', 'defined(__GNUC__)')
 219     env['clang'] = check_cc(env, 'Clang', '__clang__')
 220     env['gcc'] = env['gcc_compat'] and not env['clang']
 221     env['suncc'] = env['platform'] == 'sunos' and os.path.basename(env['CC']) == 'cc'
 222     env['icc'] = 'icc' == os.path.basename(env['CC'])
 223
 224     if env['msvc'] and env['toolchain'] == 'default' and env['machine'] == 'x86_64':
 225         # MSVC x64 support is broken in earlier versions of scons
 226         env.EnsurePythonVersion(2, 0)
 227
 228     # shortcuts
 229     machine = env['machine']
 230     platform = env['platform']
 231     x86 = env['machine'] == 'x86'
 232     ppc = env['machine'] == 'ppc'
 233     gcc_compat = env['gcc_compat']
 234     msvc = env['msvc']
 235     suncc = env['suncc']
 236     icc = env['icc']
 237
 238     # Determine whether we are cross compiling; in particular, whether we need
 239     # to compile code generators with a different compiler as the target code.
 240     hosthost_platform = host_platform.system().lower()
 241     if hosthost_platform.startswith('cygwin'):
 242         hosthost_platform = 'cygwin'
 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'] in ('release', 'opt'):
 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     env.Decider('MD5-timestamp')
 315     env.SetOption('max_drift', 60)
 316
 317     # C preprocessor options
 318     cppdefines = []
 319     cppdefines += [
 320         '__STDC_CONSTANT_MACROS',
 321         '__STDC_FORMAT_MACROS',
 322         '__STDC_LIMIT_MACROS',
 323         'HAVE_NO_AUTOCONF',
 324     ]
 325     if env['build'] in ('debug', 'checked'):
 326         cppdefines += ['DEBUG']
 327     else:
 328         cppdefines += ['NDEBUG']
 329     if env['build'] == 'profile':
 330         cppdefines += ['PROFILE']
 331     if env['build'] in ('opt', 'profile'):
 332         cppdefines += ['VMX86_STATS']
 333     if env['platform'] in ('posix', 'linux', 'freebsd', 'darwin'):
 334         cppdefines += [
 335             '_POSIX_SOURCE',
 336             ('_POSIX_C_SOURCE', '199309L'),
 337             '_SVID_SOURCE',
 338             '_BSD_SOURCE',
 339             '_GNU_SOURCE',
 340             '_DEFAULT_SOURCE',
 341         ]
 342         if env['platform'] == 'darwin':
 343             cppdefines += [
 344                 '_DARWIN_C_SOURCE',
 345                 'GLX_USE_APPLEGL',
 346                 'GLX_DIRECT_RENDERING',
 347             ]
 348         else:
 349             cppdefines += [
 350                 'GLX_DIRECT_RENDERING',
 351                 'GLX_INDIRECT_RENDERING',
 352             ]
 353
 354         if check_header(env, 'xlocale.h'):
 355             cppdefines += ['HAVE_XLOCALE_H']
 356
 357         if check_header(env, 'endian.h'):
 358             cppdefines += ['HAVE_ENDIAN_H']
 359
 360         if check_functions(env, ['strtod_l', 'strtof_l']):
 361             cppdefines += ['HAVE_STRTOD_L']
 362
 363         if check_functions(env, ['timespec_get']):
 364             cppdefines += ['HAVE_TIMESPEC_GET']
 365
 366     if platform == 'windows':
 367         cppdefines += [
 368             'WIN32',
 369             '_WINDOWS',
 370             #'_UNICODE',
 371             #'UNICODE',
 372             # http://msdn.microsoft.com/en-us/library/aa383745.aspx
 373             ('_WIN32_WINNT', '0x0601'),
 374             ('WINVER', '0x0601'),
 375         ]
 376         if gcc_compat:
 377             cppdefines += [('__MSVCRT_VERSION__', '0x0700')]
 378         if msvc:
 379             cppdefines += [
 380                 'VC_EXTRALEAN',
 381                 '_USE_MATH_DEFINES',
 382                 '_CRT_SECURE_NO_WARNINGS',
 383                 '_CRT_SECURE_NO_DEPRECATE',
 384                 '_SCL_SECURE_NO_WARNINGS',
 385                 '_SCL_SECURE_NO_DEPRECATE',
 386                 '_ALLOW_KEYWORD_MACROS',
 387                 '_HAS_EXCEPTIONS=0', # Tell C++ STL to not use exceptions
 388             ]
 389         if env['build'] in ('debug', 'checked'):
 390             cppdefines += ['_DEBUG']
 391     if platform == 'windows':
 392         cppdefines += ['PIPE_SUBSYSTEM_WINDOWS_USER']
 393     if env['embedded']:
 394         cppdefines += ['PIPE_SUBSYSTEM_EMBEDDED']
 395     if env['texture_float']:
 396         print('warning: Floating-point textures enabled.')
 397         print('warning: Please consult docs/patents.txt with your lawyer before building Mesa.')
 398         cppdefines += ['TEXTURE_FLOAT_ENABLED']
 399     env.Append(CPPDEFINES = cppdefines)
 400
 401     # C compiler options
 402     cflags = [] # C
 403     cxxflags = [] # C++
 404     ccflags = [] # C & C++
 405     if gcc_compat:
 406         if env['build'] == 'debug':
 407             ccflags += ['-O0']
 408         else:
 409             ccflags += ['-O3']
 410         if env['gcc']:
 411             # gcc's builtin memcmp is slower than glibc's
 412             # http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43052
 413             ccflags += ['-fno-builtin-memcmp']
 414         # Work around aliasing bugs - developers should comment this out
 415         ccflags += ['-fno-strict-aliasing']
 416         ccflags += ['-g']
 417         if env['build'] in ('checked', 'profile') or env['asan']:
 418             # See http://code.google.com/p/jrfonseca/wiki/Gprof2Dot#Which_options_should_I_pass_to_gcc_when_compiling_for_profiling?
 419             ccflags += [
 420                 '-fno-omit-frame-pointer',
 421             ]
 422             if env['gcc']:
 423                 ccflags += ['-fno-optimize-sibling-calls']
 424         if env['machine'] == 'x86':
 425             ccflags += [
 426                 '-m32',
 427                 #'-march=pentium4',
 428             ]
 429             if platform != 'haiku':
 430                 # NOTE: We need to ensure stack is realigned given that we
 431                 # produce shared objects, and have no control over the stack
 432                 # alignment policy of the application. Therefore we need
 433                 # -mstackrealign ore -mincoming-stack-boundary=2.
 434                 #
 435                 # XXX: We could have SSE without -mstackrealign if we always used
 436                 # __attribute__((force_align_arg_pointer)), but that's not
 437                 # always the case.
 438                 ccflags += [
 439                     '-mstackrealign', # ensure stack is aligned
 440                     '-msse', '-msse2', # enable SIMD intrinsics
 441                     '-mfpmath=sse', # generate SSE floating-point arithmetic
 442                 ]
 443             if platform in ['windows', 'darwin']:
 444                 # Workaround http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37216
 445                 ccflags += ['-fno-common']
 446             if platform in ['haiku']:
 447                 # Make optimizations compatible with Pentium or higher on Haiku
 448                 ccflags += [
 449                     '-mstackrealign', # ensure stack is aligned
 450                     '-march=i586', # Haiku target is Pentium
 451                     '-mtune=i686' # use i686 where we can
 452                 ]
 453         if env['machine'] == 'x86_64':
 454             ccflags += ['-m64']
 455             if platform == 'darwin':
 456                 ccflags += ['-fno-common']
 457         if env['platform'] not in ('cygwin', 'haiku', 'windows'):
 458             ccflags += ['-fvisibility=hidden']
 459         # See also:
 460         # - http://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html
 461         ccflags += [
 462             '-Wall',
 463             '-Wno-long-long',
 464             '-fmessage-length=0', # be nice to Eclipse
 465         ]
 466         cflags += [
 467             '-Wmissing-prototypes',
 468             '-std=gnu99',
 469         ]
 470     if icc:
 471         cflags += [
 472             '-std=gnu99',
 473         ]
 474     if msvc:
 475         # See also:
 476         # - http://msdn.microsoft.com/en-us/library/19z1t1wy.aspx
 477         # - cl /?
 478         if env['build'] == 'debug':
 479             ccflags += [
 480               '/Od', # disable optimizations
 481               '/Oi', # enable intrinsic functions
 482             ]
 483         else:
 484             ccflags += [
 485                 '/O2', # optimize for speed
 486             ]
 487         if env['build'] in ('release', 'opt'):
 488             if not env['clang']:
 489                 ccflags += [
 490                     '/GL', # enable whole program optimization
 491                 ]
 492         else:
 493             ccflags += [
 494                 '/Oy-', # disable frame pointer omission
 495             ]
 496         ccflags += [
 497             '/W3', # warning level
 498             '/wd4018', # signed/unsigned mismatch
 499             '/wd4056', # overflow in floating-point constant arithmetic
 500             '/wd4244', # conversion from 'type1' to 'type2', possible loss of data
 501             '/wd4267', # 'var' : conversion from 'size_t' to 'type', possible loss of data
 502             '/wd4305', # truncation from 'type1' to 'type2'
 503             '/wd4351', # new behavior: elements of array 'array' will be default initialized
 504             '/wd4756', # overflow in constant arithmetic
 505             '/wd4800', # forcing value to bool 'true' or 'false' (performance warning)
 506             '/wd4996', # disable deprecated POSIX name warnings
 507         ]
 508         if env['clang']:
 509             ccflags += [
 510                 '-Wno-microsoft-enum-value', # enumerator value is not representable in underlying type 'int'
 511             ]
 512         if env['machine'] == 'x86':
 513             ccflags += [
 514                 '/arch:SSE2', # use the SSE2 instructions (default since MSVC 2012)
 515             ]
 516         if platform == 'windows':
 517             ccflags += [
 518                 # TODO
 519             ]
 520         # Automatic pdb generation
 521         # See http://scons.tigris.org/issues/show_bug.cgi?id=1656
 522         env.EnsureSConsVersion(0, 98, 0)
 523         env['PDB'] = '${TARGET.base}.pdb'
 524     env.Append(CCFLAGS = ccflags)
 525     env.Append(CFLAGS = cflags)
 526     env.Append(CXXFLAGS = cxxflags)
 527
 528     if env['platform'] == 'windows' and msvc:
 529         # Choose the appropriate MSVC CRT
 530         # http://msdn.microsoft.com/en-us/library/2kzt1wy3.aspx
 531         if env['build'] in ('debug', 'checked'):
 532             env.Append(CCFLAGS = ['/MTd'])
 533             env.Append(SHCCFLAGS = ['/LDd'])
 534         else:
 535             env.Append(CCFLAGS = ['/MT'])
 536             env.Append(SHCCFLAGS = ['/LD'])
 537
 538     # Static code analysis
 539     if env['analyze']:
 540         if env['msvc']:
 541             # http://msdn.microsoft.com/en-us/library/ms173498.aspx
 542             env.Append(CCFLAGS = [
 543                 '/analyze',
 544                 #'/analyze:log', '${TARGET.base}.xml',
 545                 '/wd28251', # Inconsistent annotation for function
 546             ])
 547         if env['clang']:
 548             # scan-build will produce more comprehensive output
 549             env.Append(CCFLAGS = ['--analyze'])
 550
 551     # https://github.com/google/sanitizers/wiki/AddressSanitizer
 552     if env['asan']:
 553         if gcc_compat:
 554             env.Append(CCFLAGS = [
 555                 '-fsanitize=address',
 556             ])
 557             env.Append(LINKFLAGS = [
 558                 '-fsanitize=address',
 559             ])
 560
 561     # Assembler options
 562     if gcc_compat:
 563         if env['machine'] == 'x86':
 564             env.Append(ASFLAGS = ['-m32'])
 565         if env['machine'] == 'x86_64':
 566             env.Append(ASFLAGS = ['-m64'])
 567
 568     # Linker options
 569     linkflags = []
 570     shlinkflags = []
 571     if gcc_compat:
 572         if env['machine'] == 'x86':
 573             linkflags += ['-m32']
 574         if env['machine'] == 'x86_64':
 575             linkflags += ['-m64']
 576         if env['platform'] not in ('darwin'):
 577             shlinkflags += [
 578                 '-Wl,-Bsymbolic',
 579             ]
 580         # Handle circular dependencies in the libraries
 581         if env['platform'] in ('darwin'):
 582             pass
 583         else:
 584             env['_LIBFLAGS'] = '-Wl,--start-group ' + env['_LIBFLAGS'] + ' -Wl,--end-group'
 585         if env['platform'] == 'windows':
 586             linkflags += [
 587                 '-Wl,--nxcompat', # DEP
 588                 '-Wl,--dynamicbase', # ASLR
 589             ]
 590             # Avoid depending on gcc runtime DLLs
 591             linkflags += ['-static-libgcc']
 592             if 'w64' in env['CC'].split('-'):
 593                 linkflags += ['-static-libstdc++']
 594             # Handle the @xx symbol munging of DLL exports
 595             shlinkflags += ['-Wl,--enable-stdcall-fixup']
 596             #shlinkflags += ['-Wl,--kill-at']
 597     if msvc:
 598         if env['build'] in ('release', 'opt') and not env['clang']:
 599             # enable Link-time Code Generation
 600             linkflags += ['/LTCG']
 601             env.Append(ARFLAGS = ['/LTCG'])
 602     if platform == 'windows' and msvc:
 603         # See also:
 604         # - http://msdn2.microsoft.com/en-us/library/y0zzbyt4.aspx
 605         linkflags += [
 606             '/fixed:no',
 607             '/incremental:no',
 608             '/dynamicbase', # ASLR
 609             '/nxcompat', # DEP
 610         ]
 611     env.Append(LINKFLAGS = linkflags)
 612     env.Append(SHLINKFLAGS = shlinkflags)
 613
 614     # We have C++ in several libraries, so always link with the C++ compiler
 615     if gcc_compat:
 616         env['LINK'] = env['CXX']
 617
 618     # Default libs
 619     libs = []
 620     if env['platform'] in ('darwin', 'freebsd', 'linux', 'posix', 'sunos'):
 621         libs += ['m', 'pthread', 'dl']
 622     if env['platform'] in ('linux',):
 623         libs += ['rt']
 624     if env['platform'] in ('haiku'):
 625         libs += ['root', 'be', 'network', 'translation']
 626     env.Append(LIBS = libs)
 627
 628     # OpenMP
 629     if env['openmp']:
 630         if env['msvc']:
 631             env.Append(CCFLAGS = ['/openmp'])
 632             # When building openmp release VS2008 link.exe crashes with LNK1103 error.
 633             # Workaround: overwrite PDB flags with empty value as it isn't required anyways
 634             if env['build'] == 'release':
 635                 env['PDB'] = ''
 636         if env['gcc']:
 637             env.Append(CCFLAGS = ['-fopenmp'])
 638             env.Append(LIBS = ['gomp'])
 639
 640     # Load tools
 641     env.Tool('lex')
 642     if env['msvc']:
 643         env.Append(LEXFLAGS = [
 644             # Force flex to use const keyword in prototypes, as relies on
 645             # __cplusplus or __STDC__ macro to determine whether it's safe to
 646             # use const keyword, but MSVC never defines __STDC__ unless we
 647             # disable all MSVC extensions.
 648             '-DYY_USE_CONST=',
 649         ])
 650         # Flex relies on __STDC_VERSION__>=199901L to decide when to include
 651         # C99 inttypes.h.  We always have inttypes.h available with MSVC
 652         # (either the one bundled with MSVC 2013, or the one we bundle
 653         # ourselves), but we can't just define __STDC_VERSION__ without
 654         # breaking stuff, as MSVC doesn't fully support C99.  There's also no
 655         # way to premptively include stdint.
 656         env.Append(CCFLAGS = ['-FIinttypes.h'])
 657     if host_platform.system() == 'Windows':
 658         # Prefer winflexbison binaries, as not only they are easier to install
 659         # (no additional dependencies), but also better Windows support.
 660         if check_prog(env, 'win_flex'):
 661             env["LEX"] = 'win_flex'
 662             env.Append(LEXFLAGS = [
 663                 # windows compatibility (uses <io.h> instead of <unistd.h> and
 664                 # _isatty, _fileno functions)
 665                 '--wincompat'
 666             ])
 667
 668     env.Tool('yacc')
 669     if host_platform.system() == 'Windows':
 670         if check_prog(env, 'win_bison'):
 671             env["YACC"] = 'win_bison'
 672
 673     if env['llvm']:
 674         env.Tool('llvm')
 675
 676     # Custom builders and methods
 677     env.Tool('custom')
 678     env.AddMethod(install_program, 'InstallProgram')
 679     env.AddMethod(install_shared_library, 'InstallSharedLibrary')
 680     env.AddMethod(msvc2013_compat, 'MSVC2013Compat')
 681     env.AddMethod(unit_test, 'UnitTest')
 682
 683     env.PkgCheckModules('X11', ['x11', 'xext', 'xdamage >= 1.1', 'xfixes', 'glproto >= 1.4.13', 'dri2proto >= 2.8'])
 684     env.PkgCheckModules('XCB', ['x11-xcb', 'xcb-glx >= 1.8.1', 'xcb-dri2 >= 1.8'])
 685     env.PkgCheckModules('XF86VIDMODE', ['xxf86vm'])
 686     env.PkgCheckModules('DRM', ['libdrm >= 2.4.75'])
 687
 688     if env['x11']:
 689         env.Append(CPPPATH = env['X11_CPPPATH'])
 690
 691     env['dri'] = env['x11'] and env['drm']
 692
 693     # for debugging
 694     #print env.Dump()
 695
 696
 697 def exists(env):
 698     return 1