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
 149 def check_prog(env, prog):
 150     """Check whether this program exists."""
 151
 152     sys.stdout.write('Checking for %s ... ' % prog)
 153
 154     result = env.Detect(prog)
 155
 156     sys.stdout.write(' %s\n' % ['no', 'yes'][int(bool(result))])
 157     return result
 158
 159
 160 def generate(env):
 161     """Common environment generation code"""
 162
 163     # Tell tools which machine to compile for
 164     env['TARGET_ARCH'] = env['machine']
 165     env['MSVS_ARCH'] = env['machine']
 166
 167     # Toolchain
 168     platform = env['platform']
 169     env.Tool(env['toolchain'])
 170
 171     # Allow override compiler and specify additional flags from environment
 172     if os.environ.has_key('CC'):
 173         env['CC'] = os.environ['CC']
 174     if os.environ.has_key('CFLAGS'):
 175         env['CCFLAGS'] += SCons.Util.CLVar(os.environ['CFLAGS'])
 176     if os.environ.has_key('CXX'):
 177         env['CXX'] = os.environ['CXX']
 178     if os.environ.has_key('CXXFLAGS'):
 179         env['CXXFLAGS'] += SCons.Util.CLVar(os.environ['CXXFLAGS'])
 180     if os.environ.has_key('LDFLAGS'):
 181         env['LINKFLAGS'] += SCons.Util.CLVar(os.environ['LDFLAGS'])
 182
 183     # Detect gcc/clang not by executable name, but through pre-defined macros
 184     # as autoconf does, to avoid drawing wrong conclusions when using tools
 185     # that overrice CC/CXX like scan-build.
 186     env['gcc_compat'] = 0
 187     env['clang'] = 0
 188     env['msvc'] = 0
 189     if host_platform.system() == 'Windows':
 190         env['msvc'] = check_cc(env, 'MSVC', 'defined(_MSC_VER)', '/E')
 191     if not env['msvc']:
 192         env['gcc_compat'] = check_cc(env, 'GCC', 'defined(__GNUC__)')
 193     env['clang'] = check_cc(env, 'Clang', '__clang__')
 194     env['gcc'] = env['gcc_compat'] and not env['clang']
 195     env['suncc'] = env['platform'] == 'sunos' and os.path.basename(env['CC']) == 'cc'
 196     env['icc'] = 'icc' == os.path.basename(env['CC'])
 197
 198     if env['msvc'] and env['toolchain'] == 'default' and env['machine'] == 'x86_64':
 199         # MSVC x64 support is broken in earlier versions of scons
 200         env.EnsurePythonVersion(2, 0)
 201
 202     # shortcuts
 203     machine = env['machine']
 204     platform = env['platform']
 205     x86 = env['machine'] == 'x86'
 206     ppc = env['machine'] == 'ppc'
 207     gcc_compat = env['gcc_compat']
 208     msvc = env['msvc']
 209     suncc = env['suncc']
 210     icc = env['icc']
 211
 212     # Determine whether we are cross compiling; in particular, whether we need
 213     # to compile code generators with a different compiler as the target code.
 214     hosthost_platform = host_platform.system().lower()
 215     if hosthost_platform.startswith('cygwin'):
 216         hosthost_platform = 'cygwin'
 217     host_machine = os.environ.get('PROCESSOR_ARCHITEW6432', os.environ.get('PROCESSOR_ARCHITECTURE', host_platform.machine()))
 218     host_machine = {
 219         'x86': 'x86',
 220         'i386': 'x86',
 221         'i486': 'x86',
 222         'i586': 'x86',
 223         'i686': 'x86',
 224         'ppc' : 'ppc',
 225         'AMD64': 'x86_64',
 226         'x86_64': 'x86_64',
 227     }.get(host_machine, 'generic')
 228     env['crosscompile'] = platform != hosthost_platform
 229     if machine == 'x86_64' and host_machine != 'x86_64':
 230         env['crosscompile'] = True
 231     env['hostonly'] = False
 232
 233     # Backwards compatability with the debug= profile= options
 234     if env['build'] == 'debug':
 235         if not env['debug']:
 236             print 'scons: warning: debug option is deprecated and will be removed eventually; use instead'
 237             print
 238             print ' scons build=release'
 239             print
 240             env['build'] = 'release'
 241         if env['profile']:
 242             print 'scons: warning: profile option is deprecated and will be removed eventually; use instead'
 243             print
 244             print ' scons build=profile'
 245             print
 246             env['build'] = 'profile'
 247     if False:
 248         # Enforce SConscripts to use the new build variable
 249         env.popitem('debug')
 250         env.popitem('profile')
 251     else:
 252         # Backwards portability with older sconscripts
 253         if env['build'] in ('debug', 'checked'):
 254             env['debug'] = True
 255             env['profile'] = False
 256         if env['build'] == 'profile':
 257             env['debug'] = False
 258             env['profile'] = True
 259         if env['build'] in ('release', 'opt'):
 260             env['debug'] = False
 261             env['profile'] = False
 262
 263     # Put build output in a separate dir, which depends on the current
 264     # configuration. See also http://www.scons.org/wiki/AdvancedBuildExample
 265     build_topdir = 'build'
 266     build_subdir = env['platform']
 267     if env['embedded']:
 268         build_subdir =  'embedded-' + build_subdir
 269     if env['machine'] != 'generic':
 270         build_subdir += '-' + env['machine']
 271     if env['build'] != 'release':
 272         build_subdir += '-' +  env['build']
 273     build_dir = os.path.join(build_topdir, build_subdir)
 274     # Place the .sconsign file in the build dir too, to avoid issues with
 275     # different scons versions building the same source file
 276     env['build_dir'] = build_dir
 277     env.SConsignFile(os.path.join(build_dir, '.sconsign'))
 278     if 'SCONS_CACHE_DIR' in os.environ:
 279         print 'scons: Using build cache in %s.' % (os.environ['SCONS_CACHE_DIR'],)
 280         env.CacheDir(os.environ['SCONS_CACHE_DIR'])
 281     env['CONFIGUREDIR'] = os.path.join(build_dir, 'conf')
 282     env['CONFIGURELOG'] = os.path.join(os.path.abspath(build_dir), 'config.log')
 283
 284     # Parallel build
 285     if env.GetOption('num_jobs') <= 1:
 286         env.SetOption('num_jobs', num_jobs())
 287
 288     env.Decider('MD5-timestamp')
 289     env.SetOption('max_drift', 60)
 290
 291     # C preprocessor options
 292     cppdefines = []
 293     cppdefines += [
 294         '__STDC_CONSTANT_MACROS',
 295         '__STDC_FORMAT_MACROS',
 296         '__STDC_LIMIT_MACROS',
 297         'HAVE_NO_AUTOCONF',
 298     ]
 299     if env['build'] in ('debug', 'checked'):
 300         cppdefines += ['DEBUG']
 301     else:
 302         cppdefines += ['NDEBUG']
 303     if env['build'] == 'profile':
 304         cppdefines += ['PROFILE']
 305     if env['build'] in ('opt', 'profile'):
 306         cppdefines += ['VMX86_STATS']
 307     if env['platform'] in ('posix', 'linux', 'freebsd', 'darwin'):
 308         cppdefines += [
 309             '_POSIX_SOURCE',
 310             ('_POSIX_C_SOURCE', '199309L'),
 311             '_SVID_SOURCE',
 312             '_BSD_SOURCE',
 313             '_GNU_SOURCE',
 314             '_DEFAULT_SOURCE',
 315         ]
 316         if env['platform'] == 'darwin':
 317             cppdefines += [
 318                 '_DARWIN_C_SOURCE',
 319                 'GLX_USE_APPLEGL',
 320                 'GLX_DIRECT_RENDERING',
 321             ]
 322         else:
 323             cppdefines += [
 324                 'GLX_DIRECT_RENDERING',
 325                 'GLX_INDIRECT_RENDERING',
 326             ]
 327
 328         if env['platform'] in ('linux', 'darwin'):
 329             cppdefines += ['HAVE_XLOCALE_H']
 330
 331     if platform == 'windows':
 332         cppdefines += [
 333             'WIN32',
 334             '_WINDOWS',
 335             #'_UNICODE',
 336             #'UNICODE',
 337             # http://msdn.microsoft.com/en-us/library/aa383745.aspx
 338             ('_WIN32_WINNT', '0x0601'),
 339             ('WINVER', '0x0601'),
 340         ]
 341         if gcc_compat:
 342             cppdefines += [('__MSVCRT_VERSION__', '0x0700')]
 343         if msvc:
 344             cppdefines += [
 345                 'VC_EXTRALEAN',
 346                 '_USE_MATH_DEFINES',
 347                 '_CRT_SECURE_NO_WARNINGS',
 348                 '_CRT_SECURE_NO_DEPRECATE',
 349                 '_SCL_SECURE_NO_WARNINGS',
 350                 '_SCL_SECURE_NO_DEPRECATE',
 351                 '_ALLOW_KEYWORD_MACROS',
 352                 '_HAS_EXCEPTIONS=0', # Tell C++ STL to not use exceptions
 353             ]
 354         if env['build'] in ('debug', 'checked'):
 355             cppdefines += ['_DEBUG']
 356     if platform == 'windows':
 357         cppdefines += ['PIPE_SUBSYSTEM_WINDOWS_USER']
 358     if env['embedded']:
 359         cppdefines += ['PIPE_SUBSYSTEM_EMBEDDED']
 360     if env['texture_float']:
 361         print 'warning: Floating-point textures enabled.'
 362         print 'warning: Please consult docs/patents.txt with your lawyer before building Mesa.'
 363         cppdefines += ['TEXTURE_FLOAT_ENABLED']
 364     env.Append(CPPDEFINES = cppdefines)
 365
 366     # C compiler options
 367     cflags = [] # C
 368     cxxflags = [] # C++
 369     ccflags = [] # C & C++
 370     if gcc_compat:
 371         if env['build'] == 'debug':
 372             ccflags += ['-O0']
 373         else:
 374             ccflags += ['-O3']
 375         if env['gcc']:
 376             # gcc's builtin memcmp is slower than glibc's
 377             # http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43052
 378             ccflags += ['-fno-builtin-memcmp']
 379         # Work around aliasing bugs - developers should comment this out
 380         ccflags += ['-fno-strict-aliasing']
 381         ccflags += ['-g']
 382         if env['build'] in ('checked', 'profile') or env['asan']:
 383             # See http://code.google.com/p/jrfonseca/wiki/Gprof2Dot#Which_options_should_I_pass_to_gcc_when_compiling_for_profiling?
 384             ccflags += [
 385                 '-fno-omit-frame-pointer',
 386             ]
 387             if env['gcc']:
 388                 ccflags += ['-fno-optimize-sibling-calls']
 389         if env['machine'] == 'x86':
 390             ccflags += [
 391                 '-m32',
 392                 #'-march=pentium4',
 393             ]
 394             if platform != 'haiku':
 395                 # NOTE: We need to ensure stack is realigned given that we
 396                 # produce shared objects, and have no control over the stack
 397                 # alignment policy of the application. Therefore we need
 398                 # -mstackrealign ore -mincoming-stack-boundary=2.
 399                 #
 400                 # XXX: We could have SSE without -mstackrealign if we always used
 401                 # __attribute__((force_align_arg_pointer)), but that's not
 402                 # always the case.
 403                 ccflags += [
 404                     '-mstackrealign', # ensure stack is aligned
 405                     '-msse', '-msse2', # enable SIMD intrinsics
 406                     '-mfpmath=sse', # generate SSE floating-point arithmetic
 407                 ]
 408             if platform in ['windows', 'darwin']:
 409                 # Workaround http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37216
 410                 ccflags += ['-fno-common']
 411             if platform in ['haiku']:
 412                 # Make optimizations compatible with Pentium or higher on Haiku
 413                 ccflags += [
 414                     '-mstackrealign', # ensure stack is aligned
 415                     '-march=i586', # Haiku target is Pentium
 416                     '-mtune=i686' # use i686 where we can
 417                 ]
 418         if env['machine'] == 'x86_64':
 419             ccflags += ['-m64']
 420             if platform == 'darwin':
 421                 ccflags += ['-fno-common']
 422         if env['platform'] not in ('cygwin', 'haiku', 'windows'):
 423             ccflags += ['-fvisibility=hidden']
 424         # See also:
 425         # - http://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html
 426         ccflags += [
 427             '-Wall',
 428             '-Wno-long-long',
 429             '-fmessage-length=0', # be nice to Eclipse
 430         ]
 431         cflags += [
 432             '-Wmissing-prototypes',
 433             '-std=gnu99',
 434         ]
 435     if icc:
 436         cflags += [
 437             '-std=gnu99',
 438         ]
 439     if msvc:
 440         # See also:
 441         # - http://msdn.microsoft.com/en-us/library/19z1t1wy.aspx
 442         # - cl /?
 443         if env['build'] == 'debug':
 444             ccflags += [
 445               '/Od', # disable optimizations
 446               '/Oi', # enable intrinsic functions
 447             ]
 448         else:
 449             ccflags += [
 450                 '/O2', # optimize for speed
 451             ]
 452         if env['build'] in ('release', 'opt'):
 453             if not env['clang']:
 454                 ccflags += [
 455                     '/GL', # enable whole program optimization
 456                 ]
 457         else:
 458             ccflags += [
 459                 '/Oy-', # disable frame pointer omission
 460             ]
 461         ccflags += [
 462             '/W3', # warning level
 463             '/wd4018', # signed/unsigned mismatch
 464             '/wd4056', # overflow in floating-point constant arithmetic
 465             '/wd4244', # conversion from 'type1' to 'type2', possible loss of data
 466             '/wd4267', # 'var' : conversion from 'size_t' to 'type', possible loss of data
 467             '/wd4305', # truncation from 'type1' to 'type2'
 468             '/wd4351', # new behavior: elements of array 'array' will be default initialized
 469             '/wd4756', # overflow in constant arithmetic
 470             '/wd4800', # forcing value to bool 'true' or 'false' (performance warning)
 471             '/wd4996', # disable deprecated POSIX name warnings
 472         ]
 473         if env['clang']:
 474             ccflags += [
 475                 '-Wno-microsoft-enum-value', # enumerator value is not representable in underlying type 'int'
 476             ]
 477         if env['machine'] == 'x86':
 478             ccflags += [
 479                 '/arch:SSE2', # use the SSE2 instructions (default since MSVC 2012)
 480             ]
 481         if platform == 'windows':
 482             ccflags += [
 483                 # TODO
 484             ]
 485         # Automatic pdb generation
 486         # See http://scons.tigris.org/issues/show_bug.cgi?id=1656
 487         env.EnsureSConsVersion(0, 98, 0)
 488         env['PDB'] = '${TARGET.base}.pdb'
 489     env.Append(CCFLAGS = ccflags)
 490     env.Append(CFLAGS = cflags)
 491     env.Append(CXXFLAGS = cxxflags)
 492
 493     if env['platform'] == 'windows' and msvc:
 494         # Choose the appropriate MSVC CRT
 495         # http://msdn.microsoft.com/en-us/library/2kzt1wy3.aspx
 496         if env['build'] in ('debug', 'checked'):
 497             env.Append(CCFLAGS = ['/MTd'])
 498             env.Append(SHCCFLAGS = ['/LDd'])
 499         else:
 500             env.Append(CCFLAGS = ['/MT'])
 501             env.Append(SHCCFLAGS = ['/LD'])
 502
 503     # Static code analysis
 504     if env['analyze']:
 505         if env['msvc']:
 506             # http://msdn.microsoft.com/en-us/library/ms173498.aspx
 507             env.Append(CCFLAGS = [
 508                 '/analyze',
 509                 #'/analyze:log', '${TARGET.base}.xml',
 510                 '/wd28251', # Inconsistent annotation for function
 511             ])
 512         if env['clang']:
 513             # scan-build will produce more comprehensive output
 514             env.Append(CCFLAGS = ['--analyze'])
 515
 516     # https://github.com/google/sanitizers/wiki/AddressSanitizer
 517     if env['asan']:
 518         if gcc_compat:
 519             env.Append(CCFLAGS = [
 520                 '-fsanitize=address',
 521             ])
 522             env.Append(LINKFLAGS = [
 523                 '-fsanitize=address',
 524             ])
 525
 526     # Assembler options
 527     if gcc_compat:
 528         if env['machine'] == 'x86':
 529             env.Append(ASFLAGS = ['-m32'])
 530         if env['machine'] == 'x86_64':
 531             env.Append(ASFLAGS = ['-m64'])
 532
 533     # Linker options
 534     linkflags = []
 535     shlinkflags = []
 536     if gcc_compat:
 537         if env['machine'] == 'x86':
 538             linkflags += ['-m32']
 539         if env['machine'] == 'x86_64':
 540             linkflags += ['-m64']
 541         if env['platform'] not in ('darwin'):
 542             shlinkflags += [
 543                 '-Wl,-Bsymbolic',
 544             ]
 545         # Handle circular dependencies in the libraries
 546         if env['platform'] in ('darwin'):
 547             pass
 548         else:
 549             env['_LIBFLAGS'] = '-Wl,--start-group ' + env['_LIBFLAGS'] + ' -Wl,--end-group'
 550         if env['platform'] == 'windows':
 551             linkflags += [
 552                 '-Wl,--nxcompat', # DEP
 553                 '-Wl,--dynamicbase', # ASLR
 554             ]
 555             # Avoid depending on gcc runtime DLLs
 556             linkflags += ['-static-libgcc']
 557             if 'w64' in env['CC'].split('-'):
 558                 linkflags += ['-static-libstdc++']
 559             # Handle the @xx symbol munging of DLL exports
 560             shlinkflags += ['-Wl,--enable-stdcall-fixup']
 561             #shlinkflags += ['-Wl,--kill-at']
 562     if msvc:
 563         if env['build'] in ('release', 'opt') and not env['clang']:
 564             # enable Link-time Code Generation
 565             linkflags += ['/LTCG']
 566             env.Append(ARFLAGS = ['/LTCG'])
 567     if platform == 'windows' and msvc:
 568         # See also:
 569         # - http://msdn2.microsoft.com/en-us/library/y0zzbyt4.aspx
 570         linkflags += [
 571             '/fixed:no',
 572             '/incremental:no',
 573             '/dynamicbase', # ASLR
 574             '/nxcompat', # DEP
 575         ]
 576     env.Append(LINKFLAGS = linkflags)
 577     env.Append(SHLINKFLAGS = shlinkflags)
 578
 579     # We have C++ in several libraries, so always link with the C++ compiler
 580     if gcc_compat:
 581         env['LINK'] = env['CXX']
 582
 583     # Default libs
 584     libs = []
 585     if env['platform'] in ('darwin', 'freebsd', 'linux', 'posix', 'sunos'):
 586         libs += ['m', 'pthread', 'dl']
 587     if env['platform'] in ('linux',):
 588         libs += ['rt']
 589     if env['platform'] in ('haiku'):
 590         libs += ['root', 'be', 'network', 'translation']
 591     env.Append(LIBS = libs)
 592
 593     # OpenMP
 594     if env['openmp']:
 595         if env['msvc']:
 596             env.Append(CCFLAGS = ['/openmp'])
 597             # When building openmp release VS2008 link.exe crashes with LNK1103 error.
 598             # Workaround: overwrite PDB flags with empty value as it isn't required anyways
 599             if env['build'] == 'release':
 600                 env['PDB'] = ''
 601         if env['gcc']:
 602             env.Append(CCFLAGS = ['-fopenmp'])
 603             env.Append(LIBS = ['gomp'])
 604
 605     # Load tools
 606     env.Tool('lex')
 607     if env['msvc']:
 608         env.Append(LEXFLAGS = [
 609             # Force flex to use const keyword in prototypes, as relies on
 610             # __cplusplus or __STDC__ macro to determine whether it's safe to
 611             # use const keyword, but MSVC never defines __STDC__ unless we
 612             # disable all MSVC extensions.
 613             '-DYY_USE_CONST=',
 614         ])
 615         # Flex relies on __STDC_VERSION__>=199901L to decide when to include
 616         # C99 inttypes.h.  We always have inttypes.h available with MSVC
 617         # (either the one bundled with MSVC 2013, or the one we bundle
 618         # ourselves), but we can't just define __STDC_VERSION__ without
 619         # breaking stuff, as MSVC doesn't fully support C99.  There's also no
 620         # way to premptively include stdint.
 621         env.Append(CCFLAGS = ['-FIinttypes.h'])
 622     if host_platform.system() == 'Windows':
 623         # Prefer winflexbison binaries, as not only they are easier to install
 624         # (no additional dependencies), but also better Windows support.
 625         if check_prog(env, 'win_flex'):
 626             env["LEX"] = 'win_flex'
 627             env.Append(LEXFLAGS = [
 628                 # windows compatibility (uses <io.h> instead of <unistd.h> and
 629                 # _isatty, _fileno functions)
 630                 '--wincompat'
 631             ])
 632
 633     env.Tool('yacc')
 634     if host_platform.system() == 'Windows':
 635         if check_prog(env, 'win_bison'):
 636             env["YACC"] = 'win_bison'
 637
 638     if env['llvm']:
 639         env.Tool('llvm')
 640
 641     # Custom builders and methods
 642     env.Tool('custom')
 643     env.AddMethod(install_program, 'InstallProgram')
 644     env.AddMethod(install_shared_library, 'InstallSharedLibrary')
 645     env.AddMethod(msvc2013_compat, 'MSVC2013Compat')
 646     env.AddMethod(unit_test, 'UnitTest')
 647
 648     env.PkgCheckModules('X11', ['x11', 'xext', 'xdamage', 'xfixes', 'glproto >= 1.4.13', 'dri2proto >= 2.8'])
 649     env.PkgCheckModules('XCB', ['x11-xcb', 'xcb-glx >= 1.8.1', 'xcb-dri2 >= 1.8'])
 650     env.PkgCheckModules('XF86VIDMODE', ['xxf86vm'])
 651     env.PkgCheckModules('DRM', ['libdrm >= 2.4.66'])
 652
 653     if env['x11']:
 654         env.Append(CPPPATH = env['X11_CPPPATH'])
 655
 656     env['dri'] = env['x11'] and env['drm']
 657
 658     # for debugging
 659     #print env.Dump()
 660
 661
 662 def exists(env):
 663     return 1