1"""gallium
2
3Frontend-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
33import distutils.version
34import os
35import os.path
36import re
37import subprocess
38import platform as host_platform
39import sys
40import tempfile
41
42import SCons.Action
43import SCons.Builder
44import SCons.Scanner
45
46
47def 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
54def 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
58def install_program(env, source):
59    return install(env, source, 'bin')
60
61def 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
85def msvc2013_compat(env):
86    if env['gcc']:
87        env.Append(CCFLAGS = [
88            '-Werror=vla',
89            '-Werror=pointer-arith',
90        ])
91
92
93def 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
108def 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
127def 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
148def check_header(env, header):
149    '''Check if the header exist'''
150
151    conf = SCons.Script.Configure(env)
152    have_header = False
153
154    if conf.CheckHeader(header):
155        have_header = True
156
157    env = conf.Finish()
158    return have_header
159
160def check_functions(env, functions):
161    '''Check if all of the functions exist'''
162
163    conf = SCons.Script.Configure(env)
164    have_functions = True
165
166    for function in functions:
167        if not conf.CheckFunc(function):
168            have_functions = False
169
170    env = conf.Finish()
171    return have_functions
172
173def check_prog(env, prog):
174    """Check whether this program exists."""
175
176    sys.stdout.write('Checking for %s ... ' % prog)
177
178    result = env.Detect(prog)
179
180    sys.stdout.write(' %s\n' % ['no', 'yes'][int(bool(result))])
181    return result
182
183
184def generate(env):
185    """Common environment generation code"""
186
187    # Tell tools which machine to compile for
188    env['TARGET_ARCH'] = env['machine']
189    env['MSVS_ARCH'] = env['machine']
190
191    # Toolchain
192    platform = env['platform']
193    env.Tool(env['toolchain'])
194
195    # Allow override compiler and specify additional flags from environment
196    if 'CC' in os.environ:
197        env['CC'] = os.environ['CC']
198    if 'CFLAGS' in os.environ:
199        env['CCFLAGS'] += SCons.Util.CLVar(os.environ['CFLAGS'])
200    if 'CXX' in os.environ:
201        env['CXX'] = os.environ['CXX']
202    if 'CXXFLAGS' in os.environ:
203        env['CXXFLAGS'] += SCons.Util.CLVar(os.environ['CXXFLAGS'])
204    if 'LDFLAGS' in os.environ:
205        env['LINKFLAGS'] += SCons.Util.CLVar(os.environ['LDFLAGS'])
206
207    # Detect gcc/clang not by executable name, but through pre-defined macros
208    # as autoconf does, to avoid drawing wrong conclusions when using tools
209    # that overrice CC/CXX like scan-build.
210    env['gcc_compat'] = 0
211    env['clang'] = 0
212    env['msvc'] = 0
213    if host_platform.system() == 'Windows':
214        env['msvc'] = check_cc(env, 'MSVC', 'defined(_MSC_VER)', '/E')
215    if not env['msvc']:
216        env['gcc_compat'] = check_cc(env, 'GCC', 'defined(__GNUC__)')
217    env['clang'] = check_cc(env, 'Clang', '__clang__')
218    env['gcc'] = env['gcc_compat'] and not env['clang']
219    env['suncc'] = env['platform'] == 'sunos' and os.path.basename(env['CC']) == 'cc'
220    env['icc'] = 'icc' == os.path.basename(env['CC'])
221
222    if env['msvc'] and env['toolchain'] == 'default' and env['machine'] == 'x86_64':
223        # MSVC x64 support is broken in earlier versions of scons
224        env.EnsurePythonVersion(2, 0)
225
226    # shortcuts
227    machine = env['machine']
228    platform = env['platform']
229    x86 = env['machine'] == 'x86'
230    ppc = env['machine'] == 'ppc'
231    gcc_compat = env['gcc_compat']
232    msvc = env['msvc']
233    suncc = env['suncc']
234    icc = env['icc']
235
236    # Determine whether we are cross compiling; in particular, whether we need
237    # to compile code generators with a different compiler as the target code.
238    hosthost_platform = host_platform.system().lower()
239    if hosthost_platform.startswith('cygwin'):
240        hosthost_platform = 'cygwin'
241    host_machine = os.environ.get('PROCESSOR_ARCHITEW6432', os.environ.get('PROCESSOR_ARCHITECTURE', host_platform.machine()))
242    host_machine = {
243        'x86': 'x86',
244        'i386': 'x86',
245        'i486': 'x86',
246        'i586': 'x86',
247        'i686': 'x86',
248        'ppc' : 'ppc',
249        'AMD64': 'x86_64',
250        'x86_64': 'x86_64',
251    }.get(host_machine, 'generic')
252    env['crosscompile'] = platform != hosthost_platform
253    if machine == 'x86_64' and host_machine != 'x86_64':
254        env['crosscompile'] = True
255    env['hostonly'] = False
256
257    # Backwards compatability with the debug= profile= options
258    if env['build'] == 'debug':
259        if not env['debug']:
260            print('scons: warning: debug option is deprecated and will be removed eventually; use instead')
261            print('')
262            print(' scons build=release')
263            print('')
264            env['build'] = 'release'
265        if env['profile']:
266            print('scons: warning: profile option is deprecated and will be removed eventually; use instead')
267            print('')
268            print(' scons build=profile')
269            print('')
270            env['build'] = 'profile'
271    if False:
272        # Enforce SConscripts to use the new build variable
273        env.popitem('debug')
274        env.popitem('profile')
275    else:
276        # Backwards portability with older sconscripts
277        if env['build'] in ('debug', 'checked'):
278            env['debug'] = True
279            env['profile'] = False
280        if env['build'] == 'profile':
281            env['debug'] = False
282            env['profile'] = True
283        if env['build'] in ('release', 'opt'):
284            env['debug'] = False
285            env['profile'] = False
286
287    # Put build output in a separate dir, which depends on the current
288    # configuration. See also http://www.scons.org/wiki/AdvancedBuildExample
289    build_topdir = 'build'
290    build_subdir = env['platform']
291    if env['embedded']:
292        build_subdir =  'embedded-' + build_subdir
293    if env['machine'] != 'generic':
294        build_subdir += '-' + env['machine']
295    if env['build'] != 'release':
296        build_subdir += '-' +  env['build']
297    build_dir = os.path.join(build_topdir, build_subdir)
298    # Place the .sconsign file in the build dir too, to avoid issues with
299    # different scons versions building the same source file
300    env['build_dir'] = build_dir
301    env.SConsignFile(os.path.join(build_dir, '.sconsign'))
302    if 'SCONS_CACHE_DIR' in os.environ:
303        print('scons: Using build cache in %s.' % (os.environ['SCONS_CACHE_DIR'],))
304        env.CacheDir(os.environ['SCONS_CACHE_DIR'])
305    env['CONFIGUREDIR'] = os.path.join(build_dir, 'conf')
306    env['CONFIGURELOG'] = os.path.join(os.path.abspath(build_dir), 'config.log')
307
308    # Parallel build
309    if env.GetOption('num_jobs') <= 1:
310        env.SetOption('num_jobs', num_jobs())
311
312    env.Decider('MD5-timestamp')
313    env.SetOption('max_drift', 60)
314
315    # C preprocessor options
316    cppdefines = []
317    cppdefines += [
318        '__STDC_CONSTANT_MACROS',
319        '__STDC_FORMAT_MACROS',
320        '__STDC_LIMIT_MACROS',
321        'HAVE_NO_AUTOCONF',
322    ]
323    if env['build'] in ('debug', 'checked'):
324        cppdefines += ['DEBUG']
325    else:
326        cppdefines += ['NDEBUG']
327    if env['build'] == 'profile':
328        cppdefines += ['PROFILE']
329    if env['build'] in ('opt', 'profile'):
330        cppdefines += ['VMX86_STATS']
331    if env['platform'] in ('posix', 'linux', 'freebsd', 'darwin'):
332        cppdefines += [
333            '_POSIX_SOURCE',
334            ('_POSIX_C_SOURCE', '199309L'),
335            '_SVID_SOURCE',
336            '_BSD_SOURCE',
337            '_GNU_SOURCE',
338            '_DEFAULT_SOURCE',
339        ]
340        if env['platform'] == 'darwin':
341            cppdefines += [
342                '_DARWIN_C_SOURCE',
343                'GLX_USE_APPLEGL',
344                'GLX_DIRECT_RENDERING',
345            ]
346        else:
347            cppdefines += [
348                'GLX_DIRECT_RENDERING',
349                'GLX_INDIRECT_RENDERING',
350            ]
351
352        if check_header(env, 'xlocale.h'):
353            cppdefines += ['HAVE_XLOCALE_H']
354
355        if check_header(env, 'endian.h'):
356            cppdefines += ['HAVE_ENDIAN_H']
357
358        if check_functions(env, ['strtod_l', 'strtof_l']):
359            cppdefines += ['HAVE_STRTOD_L']
360
361        if check_functions(env, ['timespec_get']):
362            cppdefines += ['HAVE_TIMESPEC_GET']
363
364    if platform == 'windows':
365        cppdefines += [
366            'WIN32',
367            '_WINDOWS',
368            #'_UNICODE',
369            #'UNICODE',
370            # http://msdn.microsoft.com/en-us/library/aa383745.aspx
371            ('_WIN32_WINNT', '0x0601'),
372            ('WINVER', '0x0601'),
373        ]
374        if gcc_compat:
375            cppdefines += [('__MSVCRT_VERSION__', '0x0700')]
376        if msvc:
377            cppdefines += [
378                'VC_EXTRALEAN',
379                '_USE_MATH_DEFINES',
380                '_CRT_SECURE_NO_WARNINGS',
381                '_CRT_SECURE_NO_DEPRECATE',
382                '_SCL_SECURE_NO_WARNINGS',
383                '_SCL_SECURE_NO_DEPRECATE',
384                '_ALLOW_KEYWORD_MACROS',
385                '_HAS_EXCEPTIONS=0', # Tell C++ STL to not use exceptions
386            ]
387        if env['build'] in ('debug', 'checked'):
388            cppdefines += ['_DEBUG']
389    if platform == 'windows':
390        cppdefines += ['PIPE_SUBSYSTEM_WINDOWS_USER']
391    if env['embedded']:
392        cppdefines += ['PIPE_SUBSYSTEM_EMBEDDED']
393    if env['texture_float']:
394        print('warning: Floating-point textures enabled.')
395        print('warning: Please consult docs/patents.txt with your lawyer before building Mesa.')
396        cppdefines += ['TEXTURE_FLOAT_ENABLED']
397    env.Append(CPPDEFINES = cppdefines)
398
399    # C compiler options
400    cflags = [] # C
401    cxxflags = [] # C++
402    ccflags = [] # C & C++
403    if gcc_compat:
404        if env['build'] == 'debug':
405            ccflags += ['-O0']
406        else:
407            ccflags += ['-O3']
408        if env['gcc']:
409            # gcc's builtin memcmp is slower than glibc's
410            # http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43052
411            ccflags += ['-fno-builtin-memcmp']
412        # Work around aliasing bugs - developers should comment this out
413        ccflags += ['-fno-strict-aliasing']
414        ccflags += ['-g']
415        if env['build'] in ('checked', 'profile') or env['asan']:
416            # See http://code.google.com/p/jrfonseca/wiki/Gprof2Dot#Which_options_should_I_pass_to_gcc_when_compiling_for_profiling?
417            ccflags += [
418                '-fno-omit-frame-pointer',
419            ]
420            if env['gcc']:
421                ccflags += ['-fno-optimize-sibling-calls']
422        if env['machine'] == 'x86':
423            ccflags += [
424                '-m32',
425                #'-march=pentium4',
426            ]
427            if platform != 'haiku':
428                # NOTE: We need to ensure stack is realigned given that we
429                # produce shared objects, and have no control over the stack
430                # alignment policy of the application. Therefore we need
431                # -mstackrealign ore -mincoming-stack-boundary=2.
432                #
433                # XXX: We could have SSE without -mstackrealign if we always used
434                # __attribute__((force_align_arg_pointer)), but that's not
435                # always the case.
436                ccflags += [
437                    '-mstackrealign', # ensure stack is aligned
438                    '-msse', '-msse2', # enable SIMD intrinsics
439                    '-mfpmath=sse', # generate SSE floating-point arithmetic
440                ]
441            if platform in ['windows', 'darwin']:
442                # Workaround http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37216
443                ccflags += ['-fno-common']
444            if platform in ['haiku']:
445                # Make optimizations compatible with Pentium or higher on Haiku
446                ccflags += [
447                    '-mstackrealign', # ensure stack is aligned
448                    '-march=i586', # Haiku target is Pentium
449                    '-mtune=i686' # use i686 where we can
450                ]
451        if env['machine'] == 'x86_64':
452            ccflags += ['-m64']
453            if platform == 'darwin':
454                ccflags += ['-fno-common']
455        if env['platform'] not in ('cygwin', 'haiku', 'windows'):
456            ccflags += ['-fvisibility=hidden']
457        # See also:
458        # - http://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html
459        ccflags += [
460            '-Wall',
461            '-Wno-long-long',
462            '-fmessage-length=0', # be nice to Eclipse
463        ]
464        cflags += [
465            '-Wmissing-prototypes',
466            '-std=gnu99',
467        ]
468    if icc:
469        cflags += [
470            '-std=gnu99',
471        ]
472    if msvc:
473        # See also:
474        # - http://msdn.microsoft.com/en-us/library/19z1t1wy.aspx
475        # - cl /?
476        if env['build'] == 'debug':
477            ccflags += [
478              '/Od', # disable optimizations
479              '/Oi', # enable intrinsic functions
480            ]
481        else:
482            ccflags += [
483                '/O2', # optimize for speed
484            ]
485        if env['build'] in ('release', 'opt'):
486            if not env['clang']:
487                ccflags += [
488                    '/GL', # enable whole program optimization
489                ]
490        else:
491            ccflags += [
492                '/Oy-', # disable frame pointer omission
493            ]
494        ccflags += [
495            '/W3', # warning level
496            '/wd4018', # signed/unsigned mismatch
497            '/wd4056', # overflow in floating-point constant arithmetic
498            '/wd4244', # conversion from 'type1' to 'type2', possible loss of data
499            '/wd4267', # 'var' : conversion from 'size_t' to 'type', possible loss of data
500            '/wd4305', # truncation from 'type1' to 'type2'
501            '/wd4351', # new behavior: elements of array 'array' will be default initialized
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['clang']:
507            ccflags += [
508                '-Wno-microsoft-enum-value', # enumerator value is not representable in underlying type 'int'
509            ]
510        if env['machine'] == 'x86':
511            ccflags += [
512                '/arch:SSE2', # use the SSE2 instructions (default since MSVC 2012)
513            ]
514        if platform == 'windows':
515            ccflags += [
516                # TODO
517            ]
518        # Automatic pdb generation
519        # See http://scons.tigris.org/issues/show_bug.cgi?id=1656
520        env.EnsureSConsVersion(0, 98, 0)
521        env['PDB'] = '${TARGET.base}.pdb'
522    env.Append(CCFLAGS = ccflags)
523    env.Append(CFLAGS = cflags)
524    env.Append(CXXFLAGS = cxxflags)
525
526    if env['platform'] == 'windows' and msvc:
527        # Choose the appropriate MSVC CRT
528        # http://msdn.microsoft.com/en-us/library/2kzt1wy3.aspx
529        if env['build'] in ('debug', 'checked'):
530            env.Append(CCFLAGS = ['/MTd'])
531            env.Append(SHCCFLAGS = ['/LDd'])
532        else:
533            env.Append(CCFLAGS = ['/MT'])
534            env.Append(SHCCFLAGS = ['/LD'])
535
536    # Static code analysis
537    if env['analyze']:
538        if env['msvc']:
539            # http://msdn.microsoft.com/en-us/library/ms173498.aspx
540            env.Append(CCFLAGS = [
541                '/analyze',
542                #'/analyze:log', '${TARGET.base}.xml',
543                '/wd28251', # Inconsistent annotation for function
544            ])
545        if env['clang']:
546            # scan-build will produce more comprehensive output
547            env.Append(CCFLAGS = ['--analyze'])
548
549    # https://github.com/google/sanitizers/wiki/AddressSanitizer
550    if env['asan']:
551        if gcc_compat:
552            env.Append(CCFLAGS = [
553                '-fsanitize=address',
554            ])
555            env.Append(LINKFLAGS = [
556                '-fsanitize=address',
557            ])
558
559    # Assembler options
560    if gcc_compat:
561        if env['machine'] == 'x86':
562            env.Append(ASFLAGS = ['-m32'])
563        if env['machine'] == 'x86_64':
564            env.Append(ASFLAGS = ['-m64'])
565
566    # Linker options
567    linkflags = []
568    shlinkflags = []
569    if gcc_compat:
570        if env['machine'] == 'x86':
571            linkflags += ['-m32']
572        if env['machine'] == 'x86_64':
573            linkflags += ['-m64']
574        if env['platform'] not in ('darwin'):
575            shlinkflags += [
576                '-Wl,-Bsymbolic',
577            ]
578        # Handle circular dependencies in the libraries
579        if env['platform'] in ('darwin'):
580            pass
581        else:
582            env['_LIBFLAGS'] = '-Wl,--start-group ' + env['_LIBFLAGS'] + ' -Wl,--end-group'
583        if env['platform'] == 'windows':
584            linkflags += [
585                '-Wl,--nxcompat', # DEP
586                '-Wl,--dynamicbase', # ASLR
587            ]
588            # Avoid depending on gcc runtime DLLs
589            linkflags += ['-static-libgcc']
590            if 'w64' in env['CC'].split('-'):
591                linkflags += ['-static-libstdc++']
592            # Handle the @xx symbol munging of DLL exports
593            shlinkflags += ['-Wl,--enable-stdcall-fixup']
594            #shlinkflags += ['-Wl,--kill-at']
595    if msvc:
596        if env['build'] in ('release', 'opt') and not env['clang']:
597            # enable Link-time Code Generation
598            linkflags += ['/LTCG']
599            env.Append(ARFLAGS = ['/LTCG'])
600    if platform == 'windows' and msvc:
601        # See also:
602        # - http://msdn2.microsoft.com/en-us/library/y0zzbyt4.aspx
603        linkflags += [
604            '/fixed:no',
605            '/incremental:no',
606            '/dynamicbase', # ASLR
607            '/nxcompat', # DEP
608        ]
609    env.Append(LINKFLAGS = linkflags)
610    env.Append(SHLINKFLAGS = shlinkflags)
611
612    # We have C++ in several libraries, so always link with the C++ compiler
613    if gcc_compat:
614        env['LINK'] = env['CXX']
615
616    # Default libs
617    libs = []
618    if env['platform'] in ('darwin', 'freebsd', 'linux', 'posix', 'sunos'):
619        libs += ['m', 'pthread', 'dl']
620    if env['platform'] in ('linux',):
621        libs += ['rt']
622    if env['platform'] in ('haiku'):
623        libs += ['root', 'be', 'network', 'translation']
624    env.Append(LIBS = libs)
625
626    # OpenMP
627    if env['openmp']:
628        if env['msvc']:
629            env.Append(CCFLAGS = ['/openmp'])
630            # When building openmp release VS2008 link.exe crashes with LNK1103 error.
631            # Workaround: overwrite PDB flags with empty value as it isn't required anyways
632            if env['build'] == 'release':
633                env['PDB'] = ''
634        if env['gcc']:
635            env.Append(CCFLAGS = ['-fopenmp'])
636            env.Append(LIBS = ['gomp'])
637
638    # Load tools
639    env.Tool('lex')
640    if env['msvc']:
641        env.Append(LEXFLAGS = [
642            # Force flex to use const keyword in prototypes, as relies on
643            # __cplusplus or __STDC__ macro to determine whether it's safe to
644            # use const keyword, but MSVC never defines __STDC__ unless we
645            # disable all MSVC extensions.
646            '-DYY_USE_CONST=',
647        ])
648        # Flex relies on __STDC_VERSION__>=199901L to decide when to include
649        # C99 inttypes.h.  We always have inttypes.h available with MSVC
650        # (either the one bundled with MSVC 2013, or the one we bundle
651        # ourselves), but we can't just define __STDC_VERSION__ without
652        # breaking stuff, as MSVC doesn't fully support C99.  There's also no
653        # way to premptively include stdint.
654        env.Append(CCFLAGS = ['-FIinttypes.h'])
655    if host_platform.system() == 'Windows':
656        # Prefer winflexbison binaries, as not only they are easier to install
657        # (no additional dependencies), but also better Windows support.
658        if check_prog(env, 'win_flex'):
659            env["LEX"] = 'win_flex'
660            env.Append(LEXFLAGS = [
661                # windows compatibility (uses <io.h> instead of <unistd.h> and
662                # _isatty, _fileno functions)
663                '--wincompat'
664            ])
665
666    env.Tool('yacc')
667    if host_platform.system() == 'Windows':
668        if check_prog(env, 'win_bison'):
669            env["YACC"] = 'win_bison'
670
671    if env['llvm']:
672        env.Tool('llvm')
673
674    # Custom builders and methods
675    env.Tool('custom')
676    env.AddMethod(install_program, 'InstallProgram')
677    env.AddMethod(install_shared_library, 'InstallSharedLibrary')
678    env.AddMethod(msvc2013_compat, 'MSVC2013Compat')
679    env.AddMethod(unit_test, 'UnitTest')
680
681    env.PkgCheckModules('X11', ['x11', 'xext', 'xdamage >= 1.1', 'xfixes', 'glproto >= 1.4.13', 'dri2proto >= 2.8'])
682    env.PkgCheckModules('XCB', ['x11-xcb', 'xcb-glx >= 1.8.1', 'xcb-dri2 >= 1.8'])
683    env.PkgCheckModules('XF86VIDMODE', ['xxf86vm'])
684    env.PkgCheckModules('DRM', ['libdrm >= 2.4.75'])
685
686    if env['x11']:
687        env.Append(CPPPATH = env['X11_CPPPATH'])
688
689    env['dri'] = env['x11'] and env['drm']
690
691    # for debugging
692    #print env.Dump()
693
694
695def exists(env):
696    return 1
697