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             ]
 355         if env['build'] in ('debug', 'checked'):
 356             cppdefines += ['_DEBUG']
 357     if platform == 'windows':
 358         cppdefines += ['PIPE_SUBSYSTEM_WINDOWS_USER']
 359     if env['embedded']:
 360         cppdefines += ['PIPE_SUBSYSTEM_EMBEDDED']
 361     if env['texture_float']:
 362         print 'warning: Floating-point textures enabled.'
 363         print 'warning: Please consult docs/patents.txt with your lawyer before building Mesa.'
 364         cppdefines += ['TEXTURE_FLOAT_ENABLED']
 365     if gcc_compat:
 366         ccversion = env['CCVERSION']
 367         cppdefines += [
 368             'HAVE___BUILTIN_EXPECT',
 369             'HAVE___BUILTIN_FFS',
 370             'HAVE___BUILTIN_FFSLL',
 371             'HAVE_FUNC_ATTRIBUTE_FLATTEN',
 372             'HAVE_FUNC_ATTRIBUTE_UNUSED',
 373             # GCC 3.0
 374             'HAVE_FUNC_ATTRIBUTE_FORMAT',
 375             'HAVE_FUNC_ATTRIBUTE_PACKED',
 376             # GCC 3.4
 377             'HAVE___BUILTIN_CTZ',
 378             'HAVE___BUILTIN_POPCOUNT',
 379             'HAVE___BUILTIN_POPCOUNTLL',
 380             'HAVE___BUILTIN_CLZ',
 381             'HAVE___BUILTIN_CLZLL',
 382         ]
 383         if distutils.version.LooseVersion(ccversion) >= distutils.version.LooseVersion('4.5'):
 384             cppdefines += ['HAVE___BUILTIN_UNREACHABLE']
 385     env.Append(CPPDEFINES = cppdefines)
 386
 387     # C compiler options
 388     cflags = [] # C
 389     cxxflags = [] # C++
 390     ccflags = [] # C & C++
 391     if gcc_compat:
 392         ccversion = env['CCVERSION']
 393         if env['build'] == 'debug':
 394             ccflags += ['-O0']
 395         elif env['gcc'] and ccversion.startswith('4.2.'):
 396             # gcc 4.2.x optimizer is broken
 397             print "warning: gcc 4.2.x optimizer is broken -- disabling optimizations"
 398             ccflags += ['-O0']
 399         else:
 400             ccflags += ['-O3']
 401         if env['gcc']:
 402             # gcc's builtin memcmp is slower than glibc's
 403             # http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43052
 404             ccflags += ['-fno-builtin-memcmp']
 405         # Work around aliasing bugs - developers should comment this out
 406         ccflags += ['-fno-strict-aliasing']
 407         ccflags += ['-g']
 408         if env['build'] in ('checked', 'profile'):
 409             # See http://code.google.com/p/jrfonseca/wiki/Gprof2Dot#Which_options_should_I_pass_to_gcc_when_compiling_for_profiling?
 410             ccflags += [
 411                 '-fno-omit-frame-pointer',
 412             ]
 413             if env['gcc']:
 414                 ccflags += ['-fno-optimize-sibling-calls']
 415         if env['machine'] == 'x86':
 416             ccflags += [
 417                 '-m32',
 418                 #'-march=pentium4',
 419             ]
 420             if platform != 'haiku':
 421                 # NOTE: We need to ensure stack is realigned given that we
 422                 # produce shared objects, and have no control over the stack
 423                 # alignment policy of the application. Therefore we need
 424                 # -mstackrealign ore -mincoming-stack-boundary=2.
 425                 #
 426                 # XXX: We could have SSE without -mstackrealign if we always used
 427                 # __attribute__((force_align_arg_pointer)), but that's not
 428                 # always the case.
 429                 ccflags += [
 430                     '-mstackrealign', # ensure stack is aligned
 431                     '-msse', '-msse2', # enable SIMD intrinsics
 432                     '-mfpmath=sse', # generate SSE floating-point arithmetic
 433                 ]
 434             if platform in ['windows', 'darwin']:
 435                 # Workaround http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37216
 436                 ccflags += ['-fno-common']
 437             if platform in ['haiku']:
 438                 # Make optimizations compatible with Pentium or higher on Haiku
 439                 ccflags += [
 440                     '-mstackrealign', # ensure stack is aligned
 441                     '-march=i586', # Haiku target is Pentium
 442                     '-mtune=i686' # use i686 where we can
 443                 ]
 444         if env['machine'] == 'x86_64':
 445             ccflags += ['-m64']
 446             if platform == 'darwin':
 447                 ccflags += ['-fno-common']
 448         if env['platform'] not in ('cygwin', 'haiku', 'windows'):
 449             ccflags += ['-fvisibility=hidden']
 450         # See also:
 451         # - http://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html
 452         ccflags += [
 453             '-Wall',
 454             '-Wno-long-long',
 455             '-fmessage-length=0', # be nice to Eclipse
 456         ]
 457         cflags += [
 458             '-Wmissing-prototypes',
 459             '-std=gnu99',
 460         ]
 461     if icc:
 462         cflags += [
 463             '-std=gnu99',
 464         ]
 465     if msvc:
 466         # See also:
 467         # - http://msdn.microsoft.com/en-us/library/19z1t1wy.aspx
 468         # - cl /?
 469         if 'MSVC_VERSION' not in env or distutils.version.LooseVersion(env['MSVC_VERSION']) < distutils.version.LooseVersion('12.0'):
 470             # Use bundled stdbool.h and stdint.h headers for older MSVC
 471             # versions.  stdint.h was introduced in MSVC 2010, but stdbool.h
 472             # was only introduced in MSVC 2013.
 473             top_dir = os.path.abspath(os.path.join(os.path.dirname(__file__), '..'))
 474             env.Append(CPPPATH = [os.path.join(top_dir, 'include/c99')])
 475         if env['build'] == 'debug':
 476             ccflags += [
 477               '/Od', # disable optimizations
 478               '/Oi', # enable intrinsic functions
 479             ]
 480         else:
 481             if 'MSVC_VERSION' in env and distutils.version.LooseVersion(env['MSVC_VERSION']) < distutils.version.LooseVersion('11.0'):
 482                 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 )'
 483             ccflags += [
 484                 '/O2', # optimize for speed
 485             ]
 486         if env['build'] == 'release':
 487             ccflags += [
 488                 '/GL', # enable whole program optimization
 489             ]
 490         else:
 491             ccflags += [
 492                 '/Oy-', # disable frame pointer omission
 493                 '/GL-', # disable whole program optimization
 494             ]
 495         ccflags += [
 496             '/W3', # warning level
 497             '/wd4018', # signed/unsigned mismatch
 498             '/wd4056', # overflow in floating-point constant arithmetic
 499             '/wd4244', # conversion from 'type1' to 'type2', possible loss of data
 500             '/wd4305', # truncation from 'type1' to 'type2'
 501             '/wd4756', # overflow in constant arithmetic
 502             '/wd4800', # forcing value to bool 'true' or 'false' (performance warning)
 503             '/wd4996', # disable deprecated POSIX name warnings
 504         ]
 505         if env['machine'] == 'x86':
 506             ccflags += [
 507                 '/arch:SSE2', # use the SSE2 instructions (default since MSVC 2012)
 508             ]
 509         if platform == 'windows':
 510             ccflags += [
 511                 # TODO
 512             ]
 513         # Automatic pdb generation
 514         # See http://scons.tigris.org/issues/show_bug.cgi?id=1656
 515         env.EnsureSConsVersion(0, 98, 0)
 516         env['PDB'] = '${TARGET.base}.pdb'
 517     env.Append(CCFLAGS = ccflags)
 518     env.Append(CFLAGS = cflags)
 519     env.Append(CXXFLAGS = cxxflags)
 520
 521     if env['platform'] == 'windows' and msvc:
 522         # Choose the appropriate MSVC CRT
 523         # http://msdn.microsoft.com/en-us/library/2kzt1wy3.aspx
 524         if env['build'] in ('debug', 'checked'):
 525             env.Append(CCFLAGS = ['/MTd'])
 526             env.Append(SHCCFLAGS = ['/LDd'])
 527         else:
 528             env.Append(CCFLAGS = ['/MT'])
 529             env.Append(SHCCFLAGS = ['/LD'])
 530
 531     # Static code analysis
 532     if env['analyze']:
 533         if env['msvc']:
 534             # http://msdn.microsoft.com/en-us/library/ms173498.aspx
 535             env.Append(CCFLAGS = [
 536                 '/analyze',
 537                 #'/analyze:log', '${TARGET.base}.xml',
 538             ])
 539         if env['clang']:
 540             # scan-build will produce more comprehensive output
 541             env.Append(CCFLAGS = ['--analyze'])
 542
 543     # Assembler options
 544     if gcc_compat:
 545         if env['machine'] == 'x86':
 546             env.Append(ASFLAGS = ['-m32'])
 547         if env['machine'] == 'x86_64':
 548             env.Append(ASFLAGS = ['-m64'])
 549
 550     # Linker options
 551     linkflags = []
 552     shlinkflags = []
 553     if gcc_compat:
 554         if env['machine'] == 'x86':
 555             linkflags += ['-m32']
 556         if env['machine'] == 'x86_64':
 557             linkflags += ['-m64']
 558         if env['platform'] not in ('darwin'):
 559             shlinkflags += [
 560                 '-Wl,-Bsymbolic',
 561             ]
 562         # Handle circular dependencies in the libraries
 563         if env['platform'] in ('darwin'):
 564             pass
 565         else:
 566             env['_LIBFLAGS'] = '-Wl,--start-group ' + env['_LIBFLAGS'] + ' -Wl,--end-group'
 567         if env['platform'] == 'windows':
 568             linkflags += [
 569                 '-Wl,--nxcompat', # DEP
 570                 '-Wl,--dynamicbase', # ASLR
 571             ]
 572             # Avoid depending on gcc runtime DLLs
 573             linkflags += ['-static-libgcc']
 574             if 'w64' in env['CC'].split('-'):
 575                 linkflags += ['-static-libstdc++']
 576             # Handle the @xx symbol munging of DLL exports
 577             shlinkflags += ['-Wl,--enable-stdcall-fixup']
 578             #shlinkflags += ['-Wl,--kill-at']
 579     if msvc:
 580         if env['build'] == 'release':
 581             # enable Link-time Code Generation
 582             linkflags += ['/LTCG']
 583             env.Append(ARFLAGS = ['/LTCG'])
 584     if platform == 'windows' and msvc:
 585         # See also:
 586         # - http://msdn2.microsoft.com/en-us/library/y0zzbyt4.aspx
 587         linkflags += [
 588             '/fixed:no',
 589             '/incremental:no',
 590             '/dynamicbase', # ASLR
 591             '/nxcompat', # DEP
 592         ]
 593     env.Append(LINKFLAGS = linkflags)
 594     env.Append(SHLINKFLAGS = shlinkflags)
 595
 596     # We have C++ in several libraries, so always link with the C++ compiler
 597     if gcc_compat:
 598         env['LINK'] = env['CXX']
 599
 600     # Default libs
 601     libs = []
 602     if env['platform'] in ('darwin', 'freebsd', 'linux', 'posix', 'sunos'):
 603         libs += ['m', 'pthread', 'dl']
 604     if env['platform'] in ('linux',):
 605         libs += ['rt']
 606     if env['platform'] in ('haiku'):
 607         libs += ['root', 'be', 'network', 'translation']
 608     env.Append(LIBS = libs)
 609
 610     # OpenMP
 611     if env['openmp']:
 612         if env['msvc']:
 613             env.Append(CCFLAGS = ['/openmp'])
 614             # When building openmp release VS2008 link.exe crashes with LNK1103 error.
 615             # Workaround: overwrite PDB flags with empty value as it isn't required anyways
 616             if env['build'] == 'release':
 617                 env['PDB'] = ''
 618         if env['gcc']:
 619             env.Append(CCFLAGS = ['-fopenmp'])
 620             env.Append(LIBS = ['gomp'])
 621
 622     # Load tools
 623     env.Tool('lex')
 624     env.Tool('yacc')
 625     if env['llvm']:
 626         env.Tool('llvm')
 627
 628     # Custom builders and methods
 629     env.Tool('custom')
 630     createInstallMethods(env)
 631     createMSVCCompatMethods(env)
 632
 633     env.PkgCheckModules('X11', ['x11', 'xext', 'xdamage', 'xfixes', 'glproto >= 1.4.13'])
 634     env.PkgCheckModules('XCB', ['x11-xcb', 'xcb-glx >= 1.8.1', 'xcb-dri2 >= 1.8'])
 635     env.PkgCheckModules('XF86VIDMODE', ['xxf86vm'])
 636     env.PkgCheckModules('DRM', ['libdrm >= 2.4.38'])
 637     env.PkgCheckModules('UDEV', ['libudev >= 151'])
 638
 639     if env['x11']:
 640         env.Append(CPPPATH = env['X11_CPPPATH'])
 641
 642     env['dri'] = env['x11'] and env['drm']
 643
 644     # for debugging
 645     #print env.Dump()
 646
 647
 648 def exists(env):
 649     return 1