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 _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 createInstallMethods(env):
  86     env.AddMethod(install_program, 'InstallProgram')
  87     env.AddMethod(install_shared_library, 'InstallSharedLibrary')
  88
  89
  90 def msvc2013_compat(env):
  91     if env['gcc']:
  92         env.Append(CCFLAGS = [
  93             '-Werror=vla',
  94             '-Werror=pointer-arith',
  95         ])
  96
  97 def msvc2008_compat(env):
  98     msvc2013_compat(env)
  99     if env['gcc']:
 100         env.Append(CFLAGS = [
 101             '-Werror=declaration-after-statement',
 102         ])
 103
 104 def createMSVCCompatMethods(env):
 105     env.AddMethod(msvc2013_compat, 'MSVC2013Compat')
 106     env.AddMethod(msvc2008_compat, 'MSVC2008Compat')
 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)
 136     source.close()
 137
 138     pipe = SCons.Action._subproc(env, [env['CC'], cpp_opt, source.name],
 139                                  stdin = 'devnull',
 140                                  stderr = 'devnull',
 141                                  stdout = 'devnull')
 142     result = pipe.wait() == 0
 143
 144     os.unlink(source.name)
 145
 146     sys.stdout.write(' %s\n' % ['no', 'yes'][int(bool(result))])
 147     return result
 148
 149
 150 def generate(env):
 151     """Common environment generation code"""
 152
 153     # Tell tools which machine to compile for
 154     env['TARGET_ARCH'] = env['machine']
 155     env['MSVS_ARCH'] = env['machine']
 156
 157     # Toolchain
 158     platform = env['platform']
 159     env.Tool(env['toolchain'])
 160
 161     # Allow override compiler and specify additional flags from environment
 162     if os.environ.has_key('CC'):
 163         env['CC'] = os.environ['CC']
 164         # Update CCVERSION to match
 165         pipe = SCons.Action._subproc(env, [env['CC'], '--version'],
 166                                      stdin = 'devnull',
 167                                      stderr = 'devnull',
 168                                      stdout = subprocess.PIPE)
 169         if pipe.wait() == 0:
 170             line = pipe.stdout.readline()
 171             match = re.search(r'[0-9]+(\.[0-9]+)+', line)
 172             if match:
 173                 env['CCVERSION'] = match.group(0)
 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'] = 0
 187     env['clang'] = 0
 188     env['msvc'] = 0
 189     if _platform.system() == 'Windows':
 190         env['msvc'] = check_cc(env, 'MSVC', 'defined(_MSC_VER)', '/E')
 191     if not env['msvc']:
 192         env['gcc'] = check_cc(env, 'GCC', 'defined(__GNUC__) && !defined(__clang__)')
 193         env['clang'] = check_cc(env, 'Clang', '__clang__')
 194     env['suncc'] = env['platform'] == 'sunos' and os.path.basename(env['CC']) == 'cc'
 195     env['icc'] = 'icc' == os.path.basename(env['CC'])
 196
 197     if env['msvc'] and env['toolchain'] == 'default' and env['machine'] == 'x86_64':
 198         # MSVC x64 support is broken in earlier versions of scons
 199         env.EnsurePythonVersion(2, 0)
 200
 201     # shortcuts
 202     machine = env['machine']
 203     platform = env['platform']
 204     x86 = env['machine'] == 'x86'
 205     ppc = env['machine'] == 'ppc'
 206     gcc_compat = env['gcc'] or env['clang']
 207     msvc = env['msvc']
 208     suncc = env['suncc']
 209     icc = env['icc']
 210
 211     # Determine whether we are cross compiling; in particular, whether we need
 212     # to compile code generators with a different compiler as the target code.
 213     host_platform = _platform.system().lower()
 214     if host_platform.startswith('cygwin'):
 215         host_platform = 'cygwin'
 216     host_machine = os.environ.get('PROCESSOR_ARCHITEW6432', os.environ.get('PROCESSOR_ARCHITECTURE', _platform.machine()))
 217     host_machine = {
 218         'x86': 'x86',
 219         'i386': 'x86',
 220         'i486': 'x86',
 221         'i586': 'x86',
 222         'i686': 'x86',
 223         'ppc' : 'ppc',
 224         'AMD64': 'x86_64',
 225         'x86_64': 'x86_64',
 226     }.get(host_machine, 'generic')
 227     env['crosscompile'] = platform != host_platform
 228     if machine == 'x86_64' and host_machine != 'x86_64':
 229         env['crosscompile'] = True
 230     env['hostonly'] = False
 231
 232     # Backwards compatability with the debug= profile= options
 233     if env['build'] == 'debug':
 234         if not env['debug']:
 235             print 'scons: warning: debug option is deprecated and will be removed eventually; use instead'
 236             print
 237             print ' scons build=release'
 238             print
 239             env['build'] = 'release'
 240         if env['profile']:
 241             print 'scons: warning: profile option is deprecated and will be removed eventually; use instead'
 242             print
 243             print ' scons build=profile'
 244             print
 245             env['build'] = 'profile'
 246     if False:
 247         # Enforce SConscripts to use the new build variable
 248         env.popitem('debug')
 249         env.popitem('profile')
 250     else:
 251         # Backwards portability with older sconscripts
 252         if env['build'] in ('debug', 'checked'):
 253             env['debug'] = True
 254             env['profile'] = False
 255         if env['build'] == 'profile':
 256             env['debug'] = False
 257             env['profile'] = True
 258         if env['build'] == 'release':
 259             env['debug'] = False
 260             env['profile'] = False
 261
 262     # Put build output in a separate dir, which depends on the current
 263     # configuration. See also http://www.scons.org/wiki/AdvancedBuildExample
 264     build_topdir = 'build'
 265     build_subdir = env['platform']
 266     if env['embedded']:
 267         build_subdir =  'embedded-' + build_subdir
 268     if env['machine'] != 'generic':
 269         build_subdir += '-' + env['machine']
 270     if env['build'] != 'release':
 271         build_subdir += '-' +  env['build']
 272     build_dir = os.path.join(build_topdir, build_subdir)
 273     # Place the .sconsign file in the build dir too, to avoid issues with
 274     # different scons versions building the same source file
 275     env['build_dir'] = build_dir
 276     env.SConsignFile(os.path.join(build_dir, '.sconsign'))
 277     if 'SCONS_CACHE_DIR' in os.environ:
 278         print 'scons: Using build cache in %s.' % (os.environ['SCONS_CACHE_DIR'],)
 279         env.CacheDir(os.environ['SCONS_CACHE_DIR'])
 280     env['CONFIGUREDIR'] = os.path.join(build_dir, 'conf')
 281     env['CONFIGURELOG'] = os.path.join(os.path.abspath(build_dir), 'config.log')
 282
 283     # Parallel build
 284     if env.GetOption('num_jobs') <= 1:
 285         env.SetOption('num_jobs', num_jobs())
 286
 287     env.Decider('MD5-timestamp')
 288     env.SetOption('max_drift', 60)
 289
 290     # C preprocessor options
 291     cppdefines = []
 292     if env['build'] in ('debug', 'checked'):
 293         cppdefines += ['DEBUG']
 294     else:
 295         cppdefines += ['NDEBUG']
 296     if env['build'] == 'profile':
 297         cppdefines += ['PROFILE']
 298     if env['platform'] in ('posix', 'linux', 'freebsd', 'darwin'):
 299         cppdefines += [
 300             '_POSIX_SOURCE',
 301             ('_POSIX_C_SOURCE', '199309L'),
 302             '_SVID_SOURCE',
 303             '_BSD_SOURCE',
 304             '_GNU_SOURCE',
 305             '_DEFAULT_SOURCE',
 306             'HAVE_PTHREAD',
 307             'HAVE_POSIX_MEMALIGN',
 308         ]
 309         if env['platform'] == 'darwin':
 310             cppdefines += [
 311                 '_DARWIN_C_SOURCE',
 312                 'GLX_USE_APPLEGL',
 313                 'GLX_DIRECT_RENDERING',
 314             ]
 315         else:
 316             cppdefines += [
 317                 'GLX_DIRECT_RENDERING',
 318                 'GLX_INDIRECT_RENDERING',
 319             ]
 320         if env['platform'] in ('linux', 'freebsd'):
 321             cppdefines += ['HAVE_ALIAS']
 322         else:
 323             cppdefines += ['GLX_ALIAS_UNSUPPORTED']
 324
 325         if env['platform'] in ('linux', 'darwin'):
 326             cppdefines += ['HAVE_XLOCALE_H']
 327
 328     if env['platform'] == 'haiku':
 329         cppdefines += [
 330             'HAVE_PTHREAD',
 331             'HAVE_POSIX_MEMALIGN'
 332         ]
 333     if platform == 'windows':
 334         cppdefines += [
 335             'WIN32',
 336             '_WINDOWS',
 337             #'_UNICODE',
 338             #'UNICODE',
 339             # http://msdn.microsoft.com/en-us/library/aa383745.aspx
 340             ('_WIN32_WINNT', '0x0601'),
 341             ('WINVER', '0x0601'),
 342         ]
 343         if gcc_compat:
 344             cppdefines += [('__MSVCRT_VERSION__', '0x0700')]
 345         if msvc:
 346             cppdefines += [
 347                 'VC_EXTRALEAN',
 348                 '_USE_MATH_DEFINES',
 349                 '_CRT_SECURE_NO_WARNINGS',
 350                 '_CRT_SECURE_NO_DEPRECATE',
 351                 '_SCL_SECURE_NO_WARNINGS',
 352                 '_SCL_SECURE_NO_DEPRECATE',
 353                 '_ALLOW_KEYWORD_MACROS',
 354                 '_HAS_EXCEPTIONS=0', # Tell C++ STL to not use exceptions
 355             ]
 356         if env['build'] in ('debug', 'checked'):
 357             cppdefines += ['_DEBUG']
 358     if platform == 'windows':
 359         cppdefines += ['PIPE_SUBSYSTEM_WINDOWS_USER']
 360     if env['embedded']:
 361         cppdefines += ['PIPE_SUBSYSTEM_EMBEDDED']
 362     if env['texture_float']:
 363         print 'warning: Floating-point textures enabled.'
 364         print 'warning: Please consult docs/patents.txt with your lawyer before building Mesa.'
 365         cppdefines += ['TEXTURE_FLOAT_ENABLED']
 366     if gcc_compat:
 367         ccversion = env['CCVERSION']
 368         cppdefines += [
 369             'HAVE___BUILTIN_EXPECT',
 370             'HAVE___BUILTIN_FFS',
 371             'HAVE___BUILTIN_FFSLL',
 372             'HAVE_FUNC_ATTRIBUTE_FLATTEN',
 373             'HAVE_FUNC_ATTRIBUTE_UNUSED',
 374             # GCC 3.0
 375             'HAVE_FUNC_ATTRIBUTE_FORMAT',
 376             'HAVE_FUNC_ATTRIBUTE_PACKED',
 377             # GCC 3.4
 378             'HAVE___BUILTIN_CTZ',
 379             'HAVE___BUILTIN_POPCOUNT',
 380             'HAVE___BUILTIN_POPCOUNTLL',
 381             'HAVE___BUILTIN_CLZ',
 382             'HAVE___BUILTIN_CLZLL',
 383         ]
 384         if distutils.version.LooseVersion(ccversion) >= distutils.version.LooseVersion('4.5'):
 385             cppdefines += ['HAVE___BUILTIN_UNREACHABLE']
 386     env.Append(CPPDEFINES = cppdefines)
 387
 388     # C compiler options
 389     cflags = [] # C
 390     cxxflags = [] # C++
 391     ccflags = [] # C & C++
 392     if gcc_compat:
 393         ccversion = env['CCVERSION']
 394         if env['build'] == 'debug':
 395             ccflags += ['-O0']
 396         elif env['gcc'] and ccversion.startswith('4.2.'):
 397             # gcc 4.2.x optimizer is broken
 398             print "warning: gcc 4.2.x optimizer is broken -- disabling optimizations"
 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'):
 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 'MSVC_VERSION' not in env or distutils.version.LooseVersion(env['MSVC_VERSION']) < distutils.version.LooseVersion('12.0'):
 471             # Use bundled stdbool.h and stdint.h headers for older MSVC
 472             # versions.  stdint.h was introduced in MSVC 2010, but stdbool.h
 473             # was only introduced in MSVC 2013.
 474             top_dir = os.path.abspath(os.path.join(os.path.dirname(__file__), '..'))
 475             env.Append(CPPPATH = [os.path.join(top_dir, 'include/c99')])
 476         if env['build'] == 'debug':
 477             ccflags += [
 478               '/Od', # disable optimizations
 479               '/Oi', # enable intrinsic functions
 480             ]
 481         else:
 482             if 'MSVC_VERSION' in env and distutils.version.LooseVersion(env['MSVC_VERSION']) < distutils.version.LooseVersion('11.0'):
 483                 print 'scons: warning: Visual Studio versions prior to 2012 are known to produce incorrect code when optimizations are enabled ( https://bugs.freedesktop.org/show_bug.cgi?id=58718 )'
 484             ccflags += [
 485                 '/O2', # optimize for speed
 486             ]
 487         if env['build'] == 'release':
 488             ccflags += [
 489                 '/GL', # enable whole program optimization
 490             ]
 491         else:
 492             ccflags += [
 493                 '/Oy-', # disable frame pointer omission
 494                 '/GL-', # disable whole program optimization
 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             '/wd4305', # truncation from 'type1' to 'type2'
 502             '/wd4756', # overflow in constant arithmetic
 503             '/wd4800', # forcing value to bool 'true' or 'false' (performance warning)
 504             '/wd4996', # disable deprecated POSIX name warnings
 505         ]
 506         if env['machine'] == 'x86':
 507             ccflags += [
 508                 '/arch:SSE2', # use the SSE2 instructions (default since MSVC 2012)
 509             ]
 510         if platform == 'windows':
 511             ccflags += [
 512                 # TODO
 513             ]
 514         # Automatic pdb generation
 515         # See http://scons.tigris.org/issues/show_bug.cgi?id=1656
 516         env.EnsureSConsVersion(0, 98, 0)
 517         env['PDB'] = '${TARGET.base}.pdb'
 518     env.Append(CCFLAGS = ccflags)
 519     env.Append(CFLAGS = cflags)
 520     env.Append(CXXFLAGS = cxxflags)
 521
 522     if env['platform'] == 'windows' and msvc:
 523         # Choose the appropriate MSVC CRT
 524         # http://msdn.microsoft.com/en-us/library/2kzt1wy3.aspx
 525         if env['build'] in ('debug', 'checked'):
 526             env.Append(CCFLAGS = ['/MTd'])
 527             env.Append(SHCCFLAGS = ['/LDd'])
 528         else:
 529             env.Append(CCFLAGS = ['/MT'])
 530             env.Append(SHCCFLAGS = ['/LD'])
 531
 532     # Static code analysis
 533     if env['analyze']:
 534         if env['msvc']:
 535             # http://msdn.microsoft.com/en-us/library/ms173498.aspx
 536             env.Append(CCFLAGS = [
 537                 '/analyze',
 538                 #'/analyze:log', '${TARGET.base}.xml',
 539             ])
 540         if env['clang']:
 541             # scan-build will produce more comprehensive output
 542             env.Append(CCFLAGS = ['--analyze'])
 543
 544     # Assembler options
 545     if gcc_compat:
 546         if env['machine'] == 'x86':
 547             env.Append(ASFLAGS = ['-m32'])
 548         if env['machine'] == 'x86_64':
 549             env.Append(ASFLAGS = ['-m64'])
 550
 551     # Linker options
 552     linkflags = []
 553     shlinkflags = []
 554     if gcc_compat:
 555         if env['machine'] == 'x86':
 556             linkflags += ['-m32']
 557         if env['machine'] == 'x86_64':
 558             linkflags += ['-m64']
 559         if env['platform'] not in ('darwin'):
 560             shlinkflags += [
 561                 '-Wl,-Bsymbolic',
 562             ]
 563         # Handle circular dependencies in the libraries
 564         if env['platform'] in ('darwin'):
 565             pass
 566         else:
 567             env['_LIBFLAGS'] = '-Wl,--start-group ' + env['_LIBFLAGS'] + ' -Wl,--end-group'
 568         if env['platform'] == 'windows':
 569             linkflags += [
 570                 '-Wl,--nxcompat', # DEP
 571                 '-Wl,--dynamicbase', # ASLR
 572             ]
 573             # Avoid depending on gcc runtime DLLs
 574             linkflags += ['-static-libgcc']
 575             if 'w64' in env['CC'].split('-'):
 576                 linkflags += ['-static-libstdc++']
 577             # Handle the @xx symbol munging of DLL exports
 578             shlinkflags += ['-Wl,--enable-stdcall-fixup']
 579             #shlinkflags += ['-Wl,--kill-at']
 580     if msvc:
 581         if env['build'] == 'release':
 582             # enable Link-time Code Generation
 583             linkflags += ['/LTCG']
 584             env.Append(ARFLAGS = ['/LTCG'])
 585     if platform == 'windows' and msvc:
 586         # See also:
 587         # - http://msdn2.microsoft.com/en-us/library/y0zzbyt4.aspx
 588         linkflags += [
 589             '/fixed:no',
 590             '/incremental:no',
 591             '/dynamicbase', # ASLR
 592             '/nxcompat', # DEP
 593         ]
 594     env.Append(LINKFLAGS = linkflags)
 595     env.Append(SHLINKFLAGS = shlinkflags)
 596
 597     # We have C++ in several libraries, so always link with the C++ compiler
 598     if gcc_compat:
 599         env['LINK'] = env['CXX']
 600
 601     # Default libs
 602     libs = []
 603     if env['platform'] in ('darwin', 'freebsd', 'linux', 'posix', 'sunos'):
 604         libs += ['m', 'pthread', 'dl']
 605     if env['platform'] in ('linux',):
 606         libs += ['rt']
 607     if env['platform'] in ('haiku'):
 608         libs += ['root', 'be', 'network', 'translation']
 609     env.Append(LIBS = libs)
 610
 611     # OpenMP
 612     if env['openmp']:
 613         if env['msvc']:
 614             env.Append(CCFLAGS = ['/openmp'])
 615             # When building openmp release VS2008 link.exe crashes with LNK1103 error.
 616             # Workaround: overwrite PDB flags with empty value as it isn't required anyways
 617             if env['build'] == 'release':
 618                 env['PDB'] = ''
 619         if env['gcc']:
 620             env.Append(CCFLAGS = ['-fopenmp'])
 621             env.Append(LIBS = ['gomp'])
 622
 623     # Load tools
 624     env.Tool('lex')
 625     env.Tool('yacc')
 626     if env['llvm']:
 627         env.Tool('llvm')
 628
 629     # Custom builders and methods
 630     env.Tool('custom')
 631     createInstallMethods(env)
 632     createMSVCCompatMethods(env)
 633
 634     env.PkgCheckModules('X11', ['x11', 'xext', 'xdamage', 'xfixes', 'glproto >= 1.4.13'])
 635     env.PkgCheckModules('XCB', ['x11-xcb', 'xcb-glx >= 1.8.1', 'xcb-dri2 >= 1.8'])
 636     env.PkgCheckModules('XF86VIDMODE', ['xxf86vm'])
 637     env.PkgCheckModules('DRM', ['libdrm >= 2.4.38'])
 638     env.PkgCheckModules('UDEV', ['libudev >= 151'])
 639
 640     if env['x11']:
 641         env.Append(CPPPATH = env['X11_CPPPATH'])
 642
 643     env['dri'] = env['x11'] and env['drm']
 644
 645     # for debugging
 646     #print env.Dump()
 647
 648
 649 def exists(env):
 650     return 1