aboutsummaryrefslogtreecommitdiff
path: root/mesalib/scons/gallium.py
blob: 46df7a899315d7bea56b2466d4fc3e7cc54fc8ec (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
"""gallium

Frontend-tool for Gallium3D architecture.

"""

#
# Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
# All Rights Reserved.
#
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sub license, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice (including the
# next paragraph) shall be included in all copies or substantial portions
# of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
# IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
# ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
# TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#


import distutils.version
import os
import os.path
import re
import subprocess
import platform as _platform

import SCons.Action
import SCons.Builder
import SCons.Scanner


def symlink(target, source, env):
    target = str(target[0])
    source = str(source[0])
    if os.path.islink(target) or os.path.exists(target):
        os.remove(target)
    os.symlink(os.path.basename(source), target)

def install(env, source, subdir):
    target_dir = os.path.join(env.Dir('#.').srcnode().abspath, env['build_dir'], subdir)
    return env.Install(target_dir, source)

def install_program(env, source):
    return install(env, source, 'bin')

def install_shared_library(env, sources, version = ()):
    targets = []
    install_dir = os.path.join(env.Dir('#.').srcnode().abspath, env['build_dir'])
    version = tuple(map(str, version))
    if env['SHLIBSUFFIX'] == '.dll':
        dlls = env.FindIxes(sources, 'SHLIBPREFIX', 'SHLIBSUFFIX')
        targets += install(env, dlls, 'bin')
        libs = env.FindIxes(sources, 'LIBPREFIX', 'LIBSUFFIX')
        targets += install(env, libs, 'lib')
    else:
        for source in sources:
            target_dir =  os.path.join(install_dir, 'lib')
            target_name = '.'.join((str(source),) + version)
            last = env.InstallAs(os.path.join(target_dir, target_name), source)
            targets += last
            while len(version):
                version = version[:-1]
                target_name = '.'.join((str(source),) + version)
                action = SCons.Action.Action(symlink, "$TARGET -> $SOURCE")
                last = env.Command(os.path.join(target_dir, target_name), last, action) 
                targets += last
    return targets


def createInstallMethods(env):
    env.AddMethod(install_program, 'InstallProgram')
    env.AddMethod(install_shared_library, 'InstallSharedLibrary')


def num_jobs():
    try:
        return int(os.environ['NUMBER_OF_PROCESSORS'])
    except (ValueError, KeyError):
        pass

    try:
        return os.sysconf('SC_NPROCESSORS_ONLN')
    except (ValueError, OSError, AttributeError):
        pass

    try:
        return int(os.popen2("sysctl -n hw.ncpu")[1].read())
    except ValueError:
        pass

    return 1


def pkg_config_modules(env, name, modules):
    '''Simple wrapper for pkg-config.'''

    env[name] = False

    if env['platform'] == 'windows':
        return

    if not env.Detect('pkg-config'):
        return

    if subprocess.call(["pkg-config", "--exists", ' '.join(modules)]) != 0:
        return

    # Put -I and -L flags directly into the environment, as these don't affect
    # the compilation of targets that do not use them
    try:
        env.ParseConfig('pkg-config --cflags-only-I --libs-only-L ' + ' '.join(modules))
    except OSError:
        return

    # Other flags may affect the compilation of unrelated targets, so store
    # them with a prefix, (e.g., XXX_CFLAGS, XXX_LIBS, etc)
    try:
        flags = env.ParseFlags('!pkg-config --cflags-only-other --libs-only-l --libs-only-other ' + ' '.join(modules))
    except OSError:
        return
    prefix = name.upper() + '_'
    for flag_name, flag_value in flags.iteritems():
        env[prefix + flag_name] = flag_value

    env[name] = True



def generate(env):
    """Common environment generation code"""

    # Tell tools which machine to compile for
    env['TARGET_ARCH'] = env['machine']
    env['MSVS_ARCH'] = env['machine']

    # Toolchain
    platform = env['platform']
    if env['toolchain'] == 'default':
        if platform == 'winddk':
            env['toolchain'] = 'winddk'
        elif platform == 'wince':
            env['toolchain'] = 'wcesdk'
    env.Tool(env['toolchain'])

    # Allow override compiler and specify additional flags from environment
    if os.environ.has_key('CC'):
        env['CC'] = os.environ['CC']
        # Update CCVERSION to match
        pipe = SCons.Action._subproc(env, [env['CC'], '--version'],
                                     stdin = 'devnull',
                                     stderr = 'devnull',
                                     stdout = subprocess.PIPE)
        if pipe.wait() == 0:
            line = pipe.stdout.readline()
            match = re.search(r'[0-9]+(\.[0-9]+)+', line)
            if match:
                env['CCVERSION'] = match.group(0)
    if os.environ.has_key('CFLAGS'):
        env['CCFLAGS'] += SCons.Util.CLVar(os.environ['CFLAGS'])
    if os.environ.has_key('CXX'):
        env['CXX'] = os.environ['CXX']
    if os.environ.has_key('CXXFLAGS'):
        env['CXXFLAGS'] += SCons.Util.CLVar(os.environ['CXXFLAGS'])
    if os.environ.has_key('LDFLAGS'):
        env['LINKFLAGS'] += SCons.Util.CLVar(os.environ['LDFLAGS'])

    env['gcc'] = 'gcc' in os.path.basename(env['CC']).split('-')
    env['msvc'] = env['CC'] == 'cl'

    if env['msvc'] and env['toolchain'] == 'default' and env['machine'] == 'x86_64':
        # MSVC x64 support is broken in earlier versions of scons
        env.EnsurePythonVersion(2, 0)

    # shortcuts
    machine = env['machine']
    platform = env['platform']
    x86 = env['machine'] == 'x86'
    ppc = env['machine'] == 'ppc'
    gcc = env['gcc']
    msvc = env['msvc']

    # Determine whether we are cross compiling; in particular, whether we need
    # to compile code generators with a different compiler as the target code.
    host_platform = _platform.system().lower()
    host_machine = os.environ.get('PROCESSOR_ARCHITEW6432', os.environ.get('PROCESSOR_ARCHITECTURE', _platform.machine()))
    host_machine = {
        'x86': 'x86',
        'i386': 'x86',
        'i486': 'x86',
        'i586': 'x86',
        'i686': 'x86',
        'ppc' : 'ppc',
        'AMD64': 'x86_64',
        'x86_64': 'x86_64',
    }.get(host_machine, 'generic')
    env['crosscompile'] = platform != host_platform
    if machine == 'x86_64' and host_machine != 'x86_64':
        env['crosscompile'] = True
    env['hostonly'] = False

    # Backwards compatability with the debug= profile= options
    if env['build'] == 'debug':
        if not env['debug']:
            print 'scons: warning: debug option is deprecated and will be removed eventually; use instead'
            print
            print ' scons build=release'
            print
            env['build'] = 'release'
        if env['profile']:
            print 'scons: warning: profile option is deprecated and will be removed eventually; use instead'
            print
            print ' scons build=profile'
            print
            env['build'] = 'profile'
    if False:
        # Enforce SConscripts to use the new build variable
        env.popitem('debug')
        env.popitem('profile')
    else:
        # Backwards portability with older sconscripts
        if env['build'] in ('debug', 'checked'):
            env['debug'] = True
            env['profile'] = False
        if env['build'] == 'profile':
            env['debug'] = False
            env['profile'] = True
        if env['build'] == 'release':
            env['debug'] = False
            env['profile'] = False

    # Put build output in a separate dir, which depends on the current
    # configuration. See also http://www.scons.org/wiki/AdvancedBuildExample
    build_topdir = 'build'
    build_subdir = env['platform']
    if env['machine'] != 'generic':
        build_subdir += '-' + env['machine']
    if env['build'] != 'release':
        build_subdir += '-' +  env['build']
    build_dir = os.path.join(build_topdir, build_subdir)
    # Place the .sconsign file in the build dir too, to avoid issues with
    # different scons versions building the same source file
    env['build_dir'] = build_dir
    env.SConsignFile(os.path.join(build_dir, '.sconsign'))
    if 'SCONS_CACHE_DIR' in os.environ:
        print 'scons: Using build cache in %s.' % (os.environ['SCONS_CACHE_DIR'],)
        env.CacheDir(os.environ['SCONS_CACHE_DIR'])
    env['CONFIGUREDIR'] = os.path.join(build_dir, 'conf')
    env['CONFIGURELOG'] = os.path.join(os.path.abspath(build_dir), 'config.log')

    # Parallel build
    if env.GetOption('num_jobs') <= 1:
        env.SetOption('num_jobs', num_jobs())

    env.Decider('MD5-timestamp')
    env.SetOption('max_drift', 60)

    # C preprocessor options
    cppdefines = []
    if env['build'] in ('debug', 'checked'):
        cppdefines += ['DEBUG']
    else:
        cppdefines += ['NDEBUG']
    if env['build'] == 'profile':
        cppdefines += ['PROFILE']
    if platform == 'windows':
        cppdefines += [
            'WIN32',
            '_WINDOWS',
            #'_UNICODE',
            #'UNICODE',
            # http://msdn.microsoft.com/en-us/library/aa383745.aspx
            ('_WIN32_WINNT', '0x0601'),
            ('WINVER', '0x0601'),
        ]
        if msvc and env['toolchain'] != 'winddk':
            cppdefines += [
                'VC_EXTRALEAN',
                '_USE_MATH_DEFINES',
                '_CRT_SECURE_NO_WARNINGS',
                '_CRT_SECURE_NO_DEPRECATE',
                '_SCL_SECURE_NO_WARNINGS',
                '_SCL_SECURE_NO_DEPRECATE',
            ]
        if env['build'] in ('debug', 'checked'):
            cppdefines += ['_DEBUG']
    if env['toolchain'] == 'winddk':
        # Mimic WINDDK's builtin flags. See also:
        # - WINDDK's bin/makefile.new i386mk.inc for more info.
        # - buildchk_wxp_x86.log files, generated by the WINDDK's build
        # - http://alter.org.ua/docs/nt_kernel/vc8_proj/
        if machine == 'x86':
            cppdefines += ['_X86_', 'i386']
        if machine == 'x86_64':
            cppdefines += ['_AMD64_', 'AMD64']
    if platform == 'winddk':
        cppdefines += [
            'STD_CALL',
            ('CONDITION_HANDLING', '1'),
            ('NT_INST', '0'),
            ('WIN32', '100'),
            ('_NT1X_', '100'),
            ('WINNT', '1'),
            ('_WIN32_WINNT', '0x0501'), # minimum required OS version
            ('WINVER', '0x0501'),
            ('_WIN32_IE', '0x0603'),
            ('WIN32_LEAN_AND_MEAN', '1'),
            ('DEVL', '1'),
            ('__BUILDMACHINE__', 'WinDDK'),
            ('FPO', '0'),
        ]
        if env['build'] in ('debug', 'checked'):
            cppdefines += [('DBG', 1)]
    if platform == 'wince':
        cppdefines += [
            '_CRT_SECURE_NO_DEPRECATE',
            '_USE_32BIT_TIME_T',
            'UNICODE',
            '_UNICODE',
            ('UNDER_CE', '600'),
            ('_WIN32_WCE', '0x600'),
            'WINCEOEM',
            'WINCEINTERNAL',
            'WIN32',
            'STRICT',
            'x86',
            '_X86_',
            'INTERNATIONAL',
            ('INTLMSG_CODEPAGE', '1252'),
        ]
    if platform == 'windows':
        cppdefines += ['PIPE_SUBSYSTEM_WINDOWS_USER']
    if platform == 'winddk':
        cppdefines += ['PIPE_SUBSYSTEM_WINDOWS_DISPLAY']
    if platform == 'wince':
        cppdefines += ['PIPE_SUBSYSTEM_WINDOWS_CE']
        cppdefines += ['PIPE_SUBSYSTEM_WINDOWS_CE_OGL']
    if platform == 'embedded':
        cppdefines += ['PIPE_OS_EMBEDDED']
    env.Append(CPPDEFINES = cppdefines)

    # C compiler options
    cflags = [] # C
    cxxflags = [] # C++
    ccflags = [] # C & C++
    if gcc:
        ccversion = env['CCVERSION']
        if env['build'] == 'debug':
            ccflags += ['-O0']
        elif ccversion.startswith('4.2.'):
            # gcc 4.2.x optimizer is broken
            print "warning: gcc 4.2.x optimizer is broken -- disabling optimizations"
            ccflags += ['-O0']
        else:
            ccflags += ['-O3']
        ccflags += ['-g3']
        if env['build'] in ('checked', 'profile'):
            # See http://code.google.com/p/jrfonseca/wiki/Gprof2Dot#Which_options_should_I_pass_to_gcc_when_compiling_for_profiling?
            ccflags += [
                '-fno-omit-frame-pointer',
                '-fno-optimize-sibling-calls',
            ]
        if env['machine'] == 'x86':
            ccflags += [
                '-m32',
                #'-march=pentium4',
            ]
            if distutils.version.LooseVersion(ccversion) >= distutils.version.LooseVersion('4.2') \
               and (platform != 'windows' or env['build'] == 'debug' or True):
                # NOTE: We need to ensure stack is realigned given that we
                # produce shared objects, and have no control over the stack
                # alignment policy of the application. Therefore we need
                # -mstackrealign ore -mincoming-stack-boundary=2.
                #
                # XXX: -O and -mstackrealign causes stack corruption on MinGW
                #
                # XXX: We could have SSE without -mstackrealign if we always used
                # __attribute__((force_align_arg_pointer)), but that's not
                # always the case.
                ccflags += [
                    '-mstackrealign', # ensure stack is aligned
                    '-mmmx', '-msse', '-msse2', # enable SIMD intrinsics
                    #'-mfpmath=sse',
                ]
            if platform in ['windows', 'darwin']:
                # Workaround http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37216
                ccflags += ['-fno-common']
        if env['machine'] == 'x86_64':
            ccflags += ['-m64']
            if platform == 'darwin':
                ccflags += ['-fno-common']
        # See also:
        # - http://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html
        ccflags += [
            '-Wall',
            '-Wno-long-long',
            '-ffast-math',
            '-fmessage-length=0', # be nice to Eclipse
        ]
        cflags += [
            '-Wmissing-prototypes',
            '-std=gnu99',
        ]
        if distutils.version.LooseVersion(ccversion) >= distutils.version.LooseVersion('4.0'):
            ccflags += [
                '-Wmissing-field-initializers',
            ]
        if distutils.version.LooseVersion(ccversion) >= distutils.version.LooseVersion('4.2'):
            ccflags += [
                '-Werror=pointer-arith',
            ]
            cflags += [
                '-Werror=declaration-after-statement',
            ]
    if msvc:
        # See also:
        # - http://msdn.microsoft.com/en-us/library/19z1t1wy.aspx
        # - cl /?
        if env['build'] == 'debug':
            ccflags += [
              '/Od', # disable optimizations
              '/Oi', # enable intrinsic functions
              '/Oy-', # disable frame pointer omission
            ]
        else:
            ccflags += [
                '/O2', # optimize for speed
            ]
        if env['build'] == 'release':
            ccflags += [
                '/GL', # enable whole program optimization
            ]
        else:
            ccflags += [
                '/GL-', # disable whole program optimization
            ]
        ccflags += [
            '/fp:fast', # fast floating point 
            '/W3', # warning level
            #'/Wp64', # enable 64 bit porting warnings
        ]
        if env['machine'] == 'x86':
            ccflags += [
                #'/arch:SSE2', # use the SSE2 instructions
            ]
        if platform == 'windows':
            ccflags += [
                # TODO
            ]
        if platform == 'winddk':
            ccflags += [
                '/Zl', # omit default library name in .OBJ
                '/Zp8', # 8bytes struct member alignment
                '/Gy', # separate functions for linker
                '/Gm-', # disable minimal rebuild
                '/WX', # treat warnings as errors
                '/Gz', # __stdcall Calling convention
                '/GX-', # disable C++ EH
                '/GR-', # disable C++ RTTI
                '/GF', # enable read-only string pooling
                '/G6', # optimize for PPro, P-II, P-III
                '/Ze', # enable extensions
                '/Gi-', # disable incremental compilation
                '/QIfdiv-', # disable Pentium FDIV fix
                '/hotpatch', # prepares an image for hotpatching.
                #'/Z7', #enable old-style debug info
            ]
        if platform == 'wince':
            # See also C:\WINCE600\public\common\oak\misc\makefile.def
            ccflags += [
                '/Zl', # omit default library name in .OBJ
                '/GF', # enable read-only string pooling
                '/GR-', # disable C++ RTTI
                '/GS', # enable security checks
                # Allow disabling language conformance to maintain backward compat
                #'/Zc:wchar_t-', # don't force wchar_t as native type, instead of typedef
                #'/Zc:forScope-', # don't enforce Standard C++ for scoping rules
                #'/wd4867',
                #'/wd4430',
                #'/MT',
                #'/U_MT',
            ]
        # Automatic pdb generation
        # See http://scons.tigris.org/issues/show_bug.cgi?id=1656
        env.EnsureSConsVersion(0, 98, 0)
        env['PDB'] = '${TARGET.base}.pdb'
    env.Append(CCFLAGS = ccflags)
    env.Append(CFLAGS = cflags)
    env.Append(CXXFLAGS = cxxflags)

    if env['platform'] == 'windows' and msvc:
        # Choose the appropriate MSVC CRT
        # http://msdn.microsoft.com/en-us/library/2kzt1wy3.aspx
        if env['build'] in ('debug', 'checked'):
            env.Append(CCFLAGS = ['/MTd'])
            env.Append(SHCCFLAGS = ['/LDd'])
        else:
            env.Append(CCFLAGS = ['/MT'])
            env.Append(SHCCFLAGS = ['/LD'])
    
    # Assembler options
    if gcc:
        if env['machine'] == 'x86':
            env.Append(ASFLAGS = ['-m32'])
        if env['machine'] == 'x86_64':
            env.Append(ASFLAGS = ['-m64'])

    # Linker options
    linkflags = []
    shlinkflags = []
    if gcc:
        if env['machine'] == 'x86':
            linkflags += ['-m32']
        if env['machine'] == 'x86_64':
            linkflags += ['-m64']
        if env['platform'] not in ('darwin'):
            shlinkflags += [
                '-Wl,-Bsymbolic',
            ]
        # Handle circular dependencies in the libraries
        if env['platform'] in ('darwin'):
            pass
        else:
            env['_LIBFLAGS'] = '-Wl,--start-group ' + env['_LIBFLAGS'] + ' -Wl,--end-group'
    if msvc:
        if env['build'] == 'release':
            # enable Link-time Code Generation
            linkflags += ['/LTCG']
            env.Append(ARFLAGS = ['/LTCG'])
    if platform == 'windows' and msvc:
        # See also:
        # - http://msdn2.microsoft.com/en-us/library/y0zzbyt4.aspx
        linkflags += [
            '/fixed:no',
            '/incremental:no',
        ]
    if platform == 'winddk':
        linkflags += [
            '/merge:_PAGE=PAGE',
            '/merge:_TEXT=.text',
            '/section:INIT,d',
            '/opt:ref',
            '/opt:icf',
            '/ignore:4198,4010,4037,4039,4065,4070,4078,4087,4089,4221',
            '/incremental:no',
            '/fullbuild',
            '/release',
            '/nodefaultlib',
            '/wx',
            '/debug',
            '/debugtype:cv',
            '/version:5.1',
            '/osversion:5.1',
            '/functionpadmin:5',
            '/safeseh',
            '/pdbcompress',
            '/stack:0x40000,0x1000',
            '/driver',
            '/align:0x80',
            '/subsystem:native,5.01',
            '/base:0x10000',

            '/entry:DrvEnableDriver',
        ]
        if env['build'] != 'release':
            linkflags += [
                '/MAP', # http://msdn.microsoft.com/en-us/library/k7xkk3e2.aspx
            ]
    if platform == 'wince':
        linkflags += [
            '/nodefaultlib',
            #'/incremental:no',
            #'/fullbuild',
            '/entry:_DllMainCRTStartup',
        ]
    env.Append(LINKFLAGS = linkflags)
    env.Append(SHLINKFLAGS = shlinkflags)

    # We have C++ in several libraries, so always link with the C++ compiler
    if env['gcc']:
        env['LINK'] = env['CXX']

    # Default libs
    env.Append(LIBS = [])

    # Load tools
    if env['llvm']:
        env.Tool('llvm')
        env.Tool('udis86')
    
    pkg_config_modules(env, 'x11', ['x11', 'xext'])
    pkg_config_modules(env, 'drm', ['libdrm'])
    pkg_config_modules(env, 'drm_intel', ['libdrm_intel'])
    pkg_config_modules(env, 'drm_radeon', ['libdrm_radeon'])
    pkg_config_modules(env, 'xorg', ['xorg-server'])
    pkg_config_modules(env, 'kms', ['libkms'])

    env['dri'] = env['x11'] and env['drm']

    # Custom builders and methods
    env.Tool('custom')
    createInstallMethods(env)

    # for debugging
    #print env.Dump()


def exists(env):
    return 1