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_functions(env, functions):
 161     '''Check if all of the functions exist'''
 162
 163     conf = SCons.Script.Configure(env)
 164     have_functions = True
 165
 166     for function in functions:
 167         if not conf.CheckFunc(function):
 168             have_functions = False
 169
 170     env = conf.Finish()
 171     return have_functions
 172
 173 def check_prog(env, prog):
 174     """Check whether this program exists."""
 175
 176     sys.stdout.write('Checking for %s ... ' % prog)
 177
 178     result = env.Detect(prog)
 179
 180     sys.stdout.write(' %s\n' % ['no', 'yes'][int(bool(result))])
 181     return result
 182
 183
 184 def generate(env):
 185     """Common environment generation code"""
 186
 187     # Tell tools which machine to compile for
 188     env['TARGET_ARCH'] = env['machine']
 189     env['MSVS_ARCH'] = env['machine']
 190
 191     # Toolchain
 192     platform = env['platform']
 193     env.Tool(env['toolchain'])
 194
 195     # Allow override compiler and specify additional flags from environment
 196     if os.environ.has_key('CC'):
 197         env['CC'] = os.environ['CC']
 198     if os.environ.has_key('CFLAGS'):
 199         env['CCFLAGS'] += SCons.Util.CLVar(os.environ['CFLAGS'])
 200     if os.environ.has_key('CXX'):
 201         env['CXX'] = os.environ['CXX']
 202     if os.environ.has_key('CXXFLAGS'):
 203         env['CXXFLAGS'] += SCons.Util.CLVar(os.environ['CXXFLAGS'])
 204     if os.environ.has_key('LDFLAGS'):
 205         env['LINKFLAGS'] += SCons.Util.CLVar(os.environ['LDFLAGS'])
 206
 207     # Detect gcc/clang not by executable name, but through pre-defined macros
 208     # as autoconf does, to avoid drawing wrong conclusions when using tools
 209     # that overrice CC/CXX like scan-build.
 210     env['gcc_compat'] = 0
 211     env['clang'] = 0
 212     env['msvc'] = 0
 213     if host_platform.system() == 'Windows':
 214         env['msvc'] = check_cc(env, 'MSVC', 'defined(_MSC_VER)', '/E')
 215     if not env['msvc']:
 216         env['gcc_compat'] = check_cc(env, 'GCC', 'defined(__GNUC__)')
 217     env['clang'] = check_cc(env, 'Clang', '__clang__')
 218     env['gcc'] = env['gcc_compat'] and not env['clang']
 219     env['suncc'] = env['platform'] == 'sunos' and os.path.basename(env['CC']) == 'cc'
 220     env['icc'] = 'icc' == os.path.basename(env['CC'])
 221
 222     if env['msvc'] and env['toolchain'] == 'default' and env['machine'] == 'x86_64':
 223         # MSVC x64 support is broken in earlier versions of scons
 224         env.EnsurePythonVersion(2, 0)
 225
 226     # shortcuts
 227     machine = env['machine']
 228     platform = env['platform']
 229     x86 = env['machine'] == 'x86'
 230     ppc = env['machine'] == 'ppc'
 231     gcc_compat = env['gcc_compat']
 232     msvc = env['msvc']
 233     suncc = env['suncc']
 234     icc = env['icc']
 235
 236     # Determine whether we are cross compiling; in particular, whether we need
 237     # to compile code generators with a different compiler as the target code.
 238     hosthost_platform = host_platform.system().lower()
 239     if hosthost_platform.startswith('cygwin'):
 240         hosthost_platform = 'cygwin'
 241     host_machine = os.environ.get('PROCESSOR_ARCHITEW6432', os.environ.get('PROCESSOR_ARCHITECTURE', host_platform.machine()))
 242     host_machine = {
 243         'x86': 'x86',
 244         'i386': 'x86',
 245         'i486': 'x86',
 246         'i586': 'x86',
 247         'i686': 'x86',
 248         'ppc' : 'ppc',
 249         'AMD64': 'x86_64',
 250         'x86_64': 'x86_64',
 251     }.get(host_machine, 'generic')
 252     env['crosscompile'] = platform != hosthost_platform
 253     if machine == 'x86_64' and host_machine != 'x86_64':
 254         env['crosscompile'] = True
 255     env['hostonly'] = False
 256
 257     # Backwards compatability with the debug= profile= options
 258     if env['build'] == 'debug':
 259         if not env['debug']:
 260             print 'scons: warning: debug option is deprecated and will be removed eventually; use instead'
 261             print
 262             print ' scons build=release'
 263             print
 264             env['build'] = 'release'
 265         if env['profile']:
 266             print 'scons: warning: profile option is deprecated and will be removed eventually; use instead'
 267             print
 268             print ' scons build=profile'
 269             print
 270             env['build'] = 'profile'
 271     if False:
 272         # Enforce SConscripts to use the new build variable
 273         env.popitem('debug')
 274         env.popitem('profile')
 275     else:
 276         # Backwards portability with older sconscripts
 277         if env['build'] in ('debug', 'checked'):
 278             env['debug'] = True
 279             env['profile'] = False
 280         if env['build'] == 'profile':
 281             env['debug'] = False
 282             env['profile'] = True
 283         if env['build'] in ('release', 'opt'):
 284             env['debug'] = False
 285             env['profile'] = False
 286
 287     # Put build output in a separate dir, which depends on the current
 288     # configuration. See also http://www.scons.org/wiki/AdvancedBuildExample
 289     build_topdir = 'build'
 290     build_subdir = env['platform']
 291     if env['embedded']:
 292         build_subdir =  'embedded-' + build_subdir
 293     if env['machine'] != 'generic':
 294         build_subdir += '-' + env['machine']
 295     if env['build'] != 'release':
 296         build_subdir += '-' +  env['build']
 297     build_dir = os.path.join(build_topdir, build_subdir)
 298     # Place the .sconsign file in the build dir too, to avoid issues with
 299     # different scons versions building the same source file
 300     env['build_dir'] = build_dir
 301     env.SConsignFile(os.path.join(build_dir, '.sconsign'))
 302     if 'SCONS_CACHE_DIR' in os.environ:
 303         print 'scons: Using build cache in %s.' % (os.environ['SCONS_CACHE_DIR'],)
 304         env.CacheDir(os.environ['SCONS_CACHE_DIR'])
 305     env['CONFIGUREDIR'] = os.path.join(build_dir, 'conf')
 306     env['CONFIGURELOG'] = os.path.join(os.path.abspath(build_dir), 'config.log')
 307
 308     # Parallel build
 309     if env.GetOption('num_jobs') <= 1:
 310         env.SetOption('num_jobs', num_jobs())
 311
 312     env.Decider('MD5-timestamp')
 313     env.SetOption('max_drift', 60)
 314
 315     # C preprocessor options
 316     cppdefines = []
 317     cppdefines += [
 318         '__STDC_CONSTANT_MACROS',
 319         '__STDC_FORMAT_MACROS',
 320         '__STDC_LIMIT_MACROS',
 321         'HAVE_NO_AUTOCONF',
 322     ]
 323     if env['build'] in ('debug', 'checked'):
 324         cppdefines += ['DEBUG']
 325     else:
 326         cppdefines += ['NDEBUG']
 327     if env['build'] == 'profile':
 328         cppdefines += ['PROFILE']
 329     if env['build'] in ('opt', 'profile'):
 330         cppdefines += ['VMX86_STATS']
 331     if env['platform'] in ('posix', 'linux', 'freebsd', 'darwin'):
 332         cppdefines += [
 333             '_POSIX_SOURCE',
 334             ('_POSIX_C_SOURCE', '199309L'),
 335             '_SVID_SOURCE',
 336             '_BSD_SOURCE',
 337             '_GNU_SOURCE',
 338             '_DEFAULT_SOURCE',
 339         ]
 340         if env['platform'] == 'darwin':
 341             cppdefines += [
 342                 '_DARWIN_C_SOURCE',
 343                 'GLX_USE_APPLEGL',
 344                 'GLX_DIRECT_RENDERING',
 345             ]
 346         else:
 347             cppdefines += [
 348                 'GLX_DIRECT_RENDERING',
 349                 'GLX_INDIRECT_RENDERING',
 350             ]
 351
 352         if check_header(env, 'xlocale.h'):
 353             cppdefines += ['HAVE_XLOCALE_H']
 354
 355         if check_functions(env, ['strtod_l', 'strtof_l']):
 356             cppdefines += ['HAVE_STRTOD_L']
 357
 358     if platform == 'windows':
 359         cppdefines += [
 360             'WIN32',
 361             '_WINDOWS',
 362             #'_UNICODE',
 363             #'UNICODE',
 364             # http://msdn.microsoft.com/en-us/library/aa383745.aspx
 365             ('_WIN32_WINNT', '0x0601'),
 366             ('WINVER', '0x0601'),
 367         ]
 368         if gcc_compat:
 369             cppdefines += [('__MSVCRT_VERSION__', '0x0700')]
 370         if msvc:
 371             cppdefines += [
 372                 'VC_EXTRALEAN',
 373                 '_USE_MATH_DEFINES',
 374                 '_CRT_SECURE_NO_WARNINGS',
 375                 '_CRT_SECURE_NO_DEPRECATE',
 376                 '_SCL_SECURE_NO_WARNINGS',
 377                 '_SCL_SECURE_NO_DEPRECATE',
 378                 '_ALLOW_KEYWORD_MACROS',
 379                 '_HAS_EXCEPTIONS=0', # Tell C++ STL to not use exceptions
 380             ]
 381         if env['build'] in ('debug', 'checked'):
 382             cppdefines += ['_DEBUG']
 383     if platform == 'windows':
 384         cppdefines += ['PIPE_SUBSYSTEM_WINDOWS_USER']
 385     if env['embedded']:
 386         cppdefines += ['PIPE_SUBSYSTEM_EMBEDDED']
 387     if env['texture_float']:
 388         print 'warning: Floating-point textures enabled.'
 389         print 'warning: Please consult docs/patents.txt with your lawyer before building Mesa.'
 390         cppdefines += ['TEXTURE_FLOAT_ENABLED']
 391     env.Append(CPPDEFINES = cppdefines)
 392
 393     # C compiler options
 394     cflags = [] # C
 395     cxxflags = [] # C++
 396     ccflags = [] # C & C++
 397     if gcc_compat:
 398         if env['build'] == 'debug':
 399             ccflags += ['-O0']
 400         else:
 401             ccflags += ['-O3']
 402         if env['gcc']:
 403             # gcc's builtin memcmp is slower than glibc's
 404             # http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43052
 405             ccflags += ['-fno-builtin-memcmp']
 406         # Work around aliasing bugs - developers should comment this out
 407         ccflags += ['-fno-strict-aliasing']
 408         ccflags += ['-g']
 409         if env['build'] in ('checked', 'profile') or env['asan']:
 410             # See http://code.google.com/p/jrfonseca/wiki/Gprof2Dot#Which_options_should_I_pass_to_gcc_when_compiling_for_profiling?
 411             ccflags += [
 412                 '-fno-omit-frame-pointer',
 413             ]
 414             if env['gcc']:
 415                 ccflags += ['-fno-optimize-sibling-calls']
 416         if env['machine'] == 'x86':
 417             ccflags += [
 418                 '-m32',
 419                 #'-march=pentium4',
 420             ]
 421             if platform != 'haiku':
 422                 # NOTE: We need to ensure stack is realigned given that we
 423                 # produce shared objects, and have no control over the stack
 424                 # alignment policy of the application. Therefore we need
 425                 # -mstackrealign ore -mincoming-stack-boundary=2.
 426                 #
 427                 # XXX: We could have SSE without -mstackrealign if we always used
 428                 # __attribute__((force_align_arg_pointer)), but that's not
 429                 # always the case.
 430                 ccflags += [
 431                     '-mstackrealign', # ensure stack is aligned
 432                     '-msse', '-msse2', # enable SIMD intrinsics
 433                     '-mfpmath=sse', # generate SSE floating-point arithmetic
 434                 ]
 435             if platform in ['windows', 'darwin']:
 436                 # Workaround http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37216
 437                 ccflags += ['-fno-common']
 438             if platform in ['haiku']:
 439                 # Make optimizations compatible with Pentium or higher on Haiku
 440                 ccflags += [
 441                     '-mstackrealign', # ensure stack is aligned
 442                     '-march=i586', # Haiku target is Pentium
 443                     '-mtune=i686' # use i686 where we can
 444                 ]
 445         if env['machine'] == 'x86_64':
 446             ccflags += ['-m64']
 447             if platform == 'darwin':
 448                 ccflags += ['-fno-common']
 449         if env['platform'] not in ('cygwin', 'haiku', 'windows'):
 450             ccflags += ['-fvisibility=hidden']
 451         # See also:
 452         # - http://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html
 453         ccflags += [
 454             '-Wall',
 455             '-Wno-long-long',
 456             '-fmessage-length=0', # be nice to Eclipse
 457         ]
 458         cflags += [
 459             '-Wmissing-prototypes',
 460             '-std=gnu99',
 461         ]
 462     if icc:
 463         cflags += [
 464             '-std=gnu99',
 465         ]
 466     if msvc:
 467         # See also:
 468         # - http://msdn.microsoft.com/en-us/library/19z1t1wy.aspx
 469         # - cl /?
 470         if env['build'] == 'debug':
 471             ccflags += [
 472               '/Od', # disable optimizations
 473               '/Oi', # enable intrinsic functions
 474             ]
 475         else:
 476             ccflags += [
 477                 '/O2', # optimize for speed
 478             ]
 479         if env['build'] in ('release', 'opt'):
 480             if not env['clang']:
 481                 ccflags += [
 482                     '/GL', # enable whole program optimization
 483                 ]
 484         else:
 485             ccflags += [
 486                 '/Oy-', # disable frame pointer omission
 487             ]
 488         ccflags += [
 489             '/W3', # warning level
 490             '/wd4018', # signed/unsigned mismatch
 491             '/wd4056', # overflow in floating-point constant arithmetic
 492             '/wd4244', # conversion from 'type1' to 'type2', possible loss of data
 493             '/wd4267', # 'var' : conversion from 'size_t' to 'type', possible loss of data
 494             '/wd4305', # truncation from 'type1' to 'type2'
 495             '/wd4351', # new behavior: elements of array 'array' will be default initialized
 496             '/wd4756', # overflow in constant arithmetic
 497             '/wd4800', # forcing value to bool 'true' or 'false' (performance warning)
 498             '/wd4996', # disable deprecated POSIX name warnings
 499         ]
 500         if env['clang']:
 501             ccflags += [
 502                 '-Wno-microsoft-enum-value', # enumerator value is not representable in underlying type 'int'
 503             ]
 504         if env['machine'] == 'x86':
 505             ccflags += [
 506                 '/arch:SSE2', # use the SSE2 instructions (default since MSVC 2012)
 507             ]
 508         if platform == 'windows':
 509             ccflags += [
 510                 # TODO
 511             ]
 512         # Automatic pdb generation
 513         # See http://scons.tigris.org/issues/show_bug.cgi?id=1656
 514         env.EnsureSConsVersion(0, 98, 0)
 515         env['PDB'] = '${TARGET.base}.pdb'
 516     env.Append(CCFLAGS = ccflags)
 517     env.Append(CFLAGS = cflags)
 518     env.Append(CXXFLAGS = cxxflags)
 519
 520     if env['platform'] == 'windows' and msvc:
 521         # Choose the appropriate MSVC CRT
 522         # http://msdn.microsoft.com/en-us/library/2kzt1wy3.aspx
 523         if env['build'] in ('debug', 'checked'):
 524             env.Append(CCFLAGS = ['/MTd'])
 525             env.Append(SHCCFLAGS = ['/LDd'])
 526         else:
 527             env.Append(CCFLAGS = ['/MT'])
 528             env.Append(SHCCFLAGS = ['/LD'])
 529
 530     # Static code analysis
 531     if env['analyze']:
 532         if env['msvc']:
 533             # http://msdn.microsoft.com/en-us/library/ms173498.aspx
 534             env.Append(CCFLAGS = [
 535                 '/analyze',
 536                 #'/analyze:log', '${TARGET.base}.xml',
 537                 '/wd28251', # Inconsistent annotation for function
 538             ])
 539         if env['clang']:
 540             # scan-build will produce more comprehensive output
 541             env.Append(CCFLAGS = ['--analyze'])
 542
 543     # https://github.com/google/sanitizers/wiki/AddressSanitizer
 544     if env['asan']:
 545         if gcc_compat:
 546             env.Append(CCFLAGS = [
 547                 '-fsanitize=address',
 548             ])
 549             env.Append(LINKFLAGS = [
 550                 '-fsanitize=address',
 551             ])
 552
 553     # Assembler options
 554     if gcc_compat:
 555         if env['machine'] == 'x86':
 556             env.Append(ASFLAGS = ['-m32'])
 557         if env['machine'] == 'x86_64':
 558             env.Append(ASFLAGS = ['-m64'])
 559
 560     # Linker options
 561     linkflags = []
 562     shlinkflags = []
 563     if gcc_compat:
 564         if env['machine'] == 'x86':
 565             linkflags += ['-m32']
 566         if env['machine'] == 'x86_64':
 567             linkflags += ['-m64']
 568         if env['platform'] not in ('darwin'):
 569             shlinkflags += [
 570                 '-Wl,-Bsymbolic',
 571             ]
 572         # Handle circular dependencies in the libraries
 573         if env['platform'] in ('darwin'):
 574             pass
 575         else:
 576             env['_LIBFLAGS'] = '-Wl,--start-group ' + env['_LIBFLAGS'] + ' -Wl,--end-group'
 577         if env['platform'] == 'windows':
 578             linkflags += [
 579                 '-Wl,--nxcompat', # DEP
 580                 '-Wl,--dynamicbase', # ASLR
 581             ]
 582             # Avoid depending on gcc runtime DLLs
 583             linkflags += ['-static-libgcc']
 584             if 'w64' in env['CC'].split('-'):
 585                 linkflags += ['-static-libstdc++']
 586             # Handle the @xx symbol munging of DLL exports
 587             shlinkflags += ['-Wl,--enable-stdcall-fixup']
 588             #shlinkflags += ['-Wl,--kill-at']
 589     if msvc:
 590         if env['build'] in ('release', 'opt') and not env['clang']:
 591             # enable Link-time Code Generation
 592             linkflags += ['/LTCG']
 593             env.Append(ARFLAGS = ['/LTCG'])
 594     if platform == 'windows' and msvc:
 595         # See also:
 596         # - http://msdn2.microsoft.com/en-us/library/y0zzbyt4.aspx
 597         linkflags += [
 598             '/fixed:no',
 599             '/incremental:no',
 600             '/dynamicbase', # ASLR
 601             '/nxcompat', # DEP
 602         ]
 603     env.Append(LINKFLAGS = linkflags)
 604     env.Append(SHLINKFLAGS = shlinkflags)
 605
 606     # We have C++ in several libraries, so always link with the C++ compiler
 607     if gcc_compat:
 608         env['LINK'] = env['CXX']
 609
 610     # Default libs
 611     libs = []
 612     if env['platform'] in ('darwin', 'freebsd', 'linux', 'posix', 'sunos'):
 613         libs += ['m', 'pthread', 'dl']
 614     if env['platform'] in ('linux',):
 615         libs += ['rt']
 616     if env['platform'] in ('haiku'):
 617         libs += ['root', 'be', 'network', 'translation']
 618     env.Append(LIBS = libs)
 619
 620     # OpenMP
 621     if env['openmp']:
 622         if env['msvc']:
 623             env.Append(CCFLAGS = ['/openmp'])
 624             # When building openmp release VS2008 link.exe crashes with LNK1103 error.
 625             # Workaround: overwrite PDB flags with empty value as it isn't required anyways
 626             if env['build'] == 'release':
 627                 env['PDB'] = ''
 628         if env['gcc']:
 629             env.Append(CCFLAGS = ['-fopenmp'])
 630             env.Append(LIBS = ['gomp'])
 631
 632     # Load tools
 633     env.Tool('lex')
 634     if env['msvc']:
 635         env.Append(LEXFLAGS = [
 636             # Force flex to use const keyword in prototypes, as relies on
 637             # __cplusplus or __STDC__ macro to determine whether it's safe to
 638             # use const keyword, but MSVC never defines __STDC__ unless we
 639             # disable all MSVC extensions.
 640             '-DYY_USE_CONST=',
 641         ])
 642         # Flex relies on __STDC_VERSION__>=199901L to decide when to include
 643         # C99 inttypes.h.  We always have inttypes.h available with MSVC
 644         # (either the one bundled with MSVC 2013, or the one we bundle
 645         # ourselves), but we can't just define __STDC_VERSION__ without
 646         # breaking stuff, as MSVC doesn't fully support C99.  There's also no
 647         # way to premptively include stdint.
 648         env.Append(CCFLAGS = ['-FIinttypes.h'])
 649     if host_platform.system() == 'Windows':
 650         # Prefer winflexbison binaries, as not only they are easier to install
 651         # (no additional dependencies), but also better Windows support.
 652         if check_prog(env, 'win_flex'):
 653             env["LEX"] = 'win_flex'
 654             env.Append(LEXFLAGS = [
 655                 # windows compatibility (uses <io.h> instead of <unistd.h> and
 656                 # _isatty, _fileno functions)
 657                 '--wincompat'
 658             ])
 659
 660     env.Tool('yacc')
 661     if host_platform.system() == 'Windows':
 662         if check_prog(env, 'win_bison'):
 663             env["YACC"] = 'win_bison'
 664
 665     if env['llvm']:
 666         env.Tool('llvm')
 667
 668     # Custom builders and methods
 669     env.Tool('custom')
 670     env.AddMethod(install_program, 'InstallProgram')
 671     env.AddMethod(install_shared_library, 'InstallSharedLibrary')
 672     env.AddMethod(msvc2013_compat, 'MSVC2013Compat')
 673     env.AddMethod(unit_test, 'UnitTest')
 674
 675     env.PkgCheckModules('X11', ['x11', 'xext', 'xdamage >= 1.1', 'xfixes', 'glproto >= 1.4.13', 'dri2proto >= 2.8'])
 676     env.PkgCheckModules('XCB', ['x11-xcb', 'xcb-glx >= 1.8.1', 'xcb-dri2 >= 1.8'])
 677     env.PkgCheckModules('XF86VIDMODE', ['xxf86vm'])
 678     env.PkgCheckModules('DRM', ['libdrm >= 2.4.75'])
 679
 680     if env['x11']:
 681         env.Append(CPPPATH = env['X11_CPPPATH'])
 682
 683     env['dri'] = env['x11'] and env['drm']
 684
 685     # for debugging
 686     #print env.Dump()
 687
 688
 689 def exists(env):
 690     return 1