aboutsummaryrefslogtreecommitdiffstatshomepage
path: root/project/toolset.py
blob: 35d51923f114c8a01eaae9a4bb27cb8727a995b3 (plain) (blame)
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
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
# Copyright (c) 2020 Egor Tensin <Egor.Tensin@gmail.com>
# This file is part of the "cmake-common" project.
# For details, see https://github.com/egor-tensin/cmake-common.
# Distributed under the MIT License.

'''Supported platform/build system/compiler combinations include, but are not
limited to:

| Platform | Build system | Compiler  |
| -------- | ------------ | --------- |
| Linux    | make         | Clang     |
|          |              | GCC       |
|          |              | MinGW-w64 |
| Windows  | make [1]     | Clang [2] |
|          |              | MinGW-w64 |
|          | msbuild      | MSVC      |
| Cygwin   | make         | Clang     |
|          |              | GCC       |
|          |              | MinGW-w64 |

1. Both GNU make and MinGW mingw32-make.
2. clang-cl is supported by Boost 1.69.0 or higher only.
'''

# See docs/{boost,cmake}.md for a more thorough description of my pain.

import abc
import argparse
from contextlib import contextmanager
from decimal import Decimal
from enum import Enum
import logging
import os.path
import shutil

import project.mingw
from project.os import on_windows
from project.platform import Platform
from project.utils import full_exe_name, temp_file


class MSVCVersion(Enum):
    # It's the MSVC "toolset" version, or whatever.
    # Source: https://cmake.org/cmake/help/v3.20/variable/MSVC_TOOLSET_VERSION.html#variable:MSVC_TOOLSET_VERSION

    VS2010 = '100'
    VS2012 = '110'
    VS2013 = '120'
    VS2015 = '140'
    VS2017 = '141'
    VS2019 = '142'
    VS2022 = '143'

    def __str__(self):
        return str(self.value)

    def help(self):
        if self is MSVCVersion.VS2010:
            return 'Visual Studio 2010'
        if self is MSVCVersion.VS2012:
            return 'Visual Studio 2012'
        if self is MSVCVersion.VS2013:
            return 'Visual Studio 2013'
        if self is MSVCVersion.VS2015:
            return 'Visual Studio 2015'
        if self is MSVCVersion.VS2017:
            return 'Visual Studio 2017'
        if self is MSVCVersion.VS2019:
            return 'Visual Studio 2019'
        if self is MSVCVersion.VS2022:
            return 'Visual Studio 2022'
        raise NotImplementedError(f'unsupported MSVC version: {self}')

    @staticmethod
    def parse(s):
        try:
            return MSVCVersion(s)
        except ValueError as e:
            raise argparse.ArgumentTypeError(f'invalid MSVC version: {s}') from e

    @staticmethod
    def all():
        return tuple(MSVCVersion)

    def to_msvc_version(self):
        return self

    def to_visual_studio_version(self):
        if MSVCVersion.VS2010:
            return VisualStudioVersion.VS2010
        if MSVCVersion.VS2012:
            return VisualStudioVersion.VS2012
        if MSVCVersion.VS2013:
            return VisualStudioVersion.VS2013
        if MSVCVersion.VS2015:
            return VisualStudioVersion.VS2015
        if MSVCVersion.VS2017:
            return VisualStudioVersion.VS2017
        if MSVCVersion.VS2019:
            return VisualStudioVersion.VS2019
        if MSVCVersion.VS2022:
            return VisualStudioVersion.VS2022
        raise NotImplementedError(f'unsupported MSVC version: {self}')

    def to_boost_msvc_version(self):
        try:
            numeric = int(self.value)
        except ValueError:
            raise RuntimeError(f'what? MSVC versions are supposed to be integers: {self.value}')
        numeric = Decimal(numeric) / 10
        numeric = numeric.quantize(Decimal('1.0'))
        return str(numeric)

    def to_cmake_toolset(self):
        return f'v{self}'


class VisualStudioVersion(Enum):
    VS2010 = '2010'
    VS2012 = '2012'
    VS2013 = '2013'
    VS2015 = '2015'
    VS2017 = '2017'
    VS2019 = '2019'
    VS2022 = '2022'

    def __str__(self):
        return str(self.value)

    def help(self):
        if self is VisualStudioVersion.VS2010:
            return f"Same as '{ToolsetType.MSVC}{MSVCVersion.VS2010}'"
        if self is VisualStudioVersion.VS2012:
            return f"Same as '{ToolsetType.MSVC}{MSVCVersion.VS2012}'"
        if self is VisualStudioVersion.VS2013:
            return f"Same as '{ToolsetType.MSVC}{MSVCVersion.VS2013}'"
        if self is VisualStudioVersion.VS2015:
            return f"Same as '{ToolsetType.MSVC}{MSVCVersion.VS2015}'"
        if self is VisualStudioVersion.VS2017:
            return f"Same as '{ToolsetType.MSVC}{MSVCVersion.VS2017}'"
        if self is VisualStudioVersion.VS2019:
            return f"Same as '{ToolsetType.MSVC}{MSVCVersion.VS2019}'"
        if self is VisualStudioVersion.VS2022:
            return f"Same as '{ToolsetType.MSVC}{MSVCVersion.VS2022}'"
        raise NotImplementedError(f'unsupported Visual Studio version: {self}')

    @staticmethod
    def parse(s):
        try:
            return VisualStudioVersion(s)
        except ValueError as e:
            raise argparse.ArgumentTypeError(f'invalid Visual Studio version: {s}') from e

    @staticmethod
    def all():
        return tuple(VisualStudioVersion)

    def to_msvc_version(self):
        if self is VisualStudioVersion.VS2010:
            return MSVCVersion.VS2010
        if self is VisualStudioVersion.VS2012:
            return MSVCVersion.VS2012
        if self is VisualStudioVersion.VS2013:
            return MSVCVersion.VS2013
        if self is VisualStudioVersion.VS2015:
            return MSVCVersion.VS2015
        if self is VisualStudioVersion.VS2017:
            return MSVCVersion.VS2017
        if self is VisualStudioVersion.VS2019:
            return MSVCVersion.VS2019
        if self is VisualStudioVersion.VS2022:
            return MSVCVersion.VS2022
        raise NotImplementedError(f'unsupported Visual Studio version: {self}')

    def to_visual_studio_version(self):
        return self


class ToolsetType(Enum):
    AUTO = 'auto'
    MSVC = 'msvc'
    VISUAL_STUDIO = 'vs'
    GCC = 'gcc'
    MINGW = 'mingw'
    CLANG = 'clang'
    CLANG_CL = 'clang-cl'

    def __str__(self):
        return str(self.value)

    def help(self):
        if self is ToolsetType.AUTO:
            return "Means 'gcc' on Linux and 'msvc' on Windows"
        if self is ToolsetType.MSVC:
            return 'Use cl.exe'
        if self is ToolsetType.VISUAL_STUDIO:
            return "Visual Studio; same as 'msvc'"
        if self is ToolsetType.GCC:
            return 'Use gcc/g++'
        if self is ToolsetType.MINGW:
            return 'Use gcc/g++ with the PLATFORM-w64-mingw32 prefix'
        if self is ToolsetType.CLANG:
            return 'Use clang/clang++'
        if self is ToolsetType.CLANG_CL:
            return 'Use clang-cl.exe'
        raise NotImplementedError(f'unsupported toolset: {self}')

    @staticmethod
    def parse(s):
        try:
            return ToolsetType(s)
        except ValueError as e:
            raise argparse.ArgumentTypeError(f'invalid toolset: {s}') from e

    @property
    def is_versioned(self):
        if self is ToolsetType.MSVC or self is ToolsetType.VISUAL_STUDIO:
            return True
        return False

    def parse_version(self, s):
        if self is ToolsetType.MSVC:
            return MSVCVersion.parse(s)
        if self is ToolsetType.VISUAL_STUDIO:
            return VisualStudioVersion.parse(s)
        raise RuntimeError(f"this toolset doesn't support versions: {self}")

    def all_versions(self):
        if self is ToolsetType.MSVC:
            return MSVCVersion.all()
        if self is ToolsetType.VISUAL_STUDIO:
            return VisualStudioVersion.all()
        raise RuntimeError(f"this toolset doesn't support versions: {self}")

    @staticmethod
    def all():
        return tuple(ToolsetType)

    @staticmethod
    def all_versioned():
        return (t for t in ToolsetType.all() if t.is_versioned)

    @staticmethod
    def all_unversioned():
        return (t for t in ToolsetType.all() if not t.is_versioned)


class ToolsetVersion:
    def __init__(self, hint, version):
        self.hint = hint
        self.version = version

    def __str__(self):
        if self.version is None:
            return str(self.hint)
        return f'{self.hint}{self.version}'

    @staticmethod
    def default():
        return ToolsetVersion(ToolsetType.AUTO, None)

    @staticmethod
    def usage():
        return '/'.join(map(str, ToolsetType.all()))

    @staticmethod
    def help_toolsets():
        return f'''{__doc__}
{ToolsetVersion.help_all_toolsets()}
{ToolsetVersion.help_versioned_toolsets()}'''

    @staticmethod
    def help_all_toolsets():
        s = '''All supported toolsets are listed below.

'''
        max_name = max((len(str(hint)) for hint in ToolsetType.all()))
        for hint in ToolsetType.all():
            name_padding = ' ' * (max_name - len(str(hint)))
            s += f'  * {hint}{name_padding} \t{hint.help()}\n'
        return s

    @staticmethod
    def help_versioned_toolsets():
        s = '''Some toolsets support specifying a version using the VERSION suffix.  This is
a list of all supported toolset versions:

'''
        max_name = max((len(str(hint) + str(version)) for hint in ToolsetType.all_versioned() for version in hint.all_versions()))
        for hint in ToolsetType.all_versioned():
            for version in hint.all_versions():
                name = f'{hint}{version}'
                name_padding = ' ' * (max_name - len(name))
                s += f'  * {name}{name_padding} \t{version.help()}\n'
        return s

    @staticmethod
    def parse(s):
        try:
            return ToolsetVersion(ToolsetType(s), None)
        except ValueError:
            pass
        for hint in sorted(ToolsetType.all_versioned(), key=str, reverse=True):
            prefix = f'{hint}'
            if s.startswith(prefix):
                return ToolsetVersion(hint, hint.parse_version(s[len(prefix):]))
        raise argparse.ArgumentTypeError(f'invalid toolset: {s}')


class Toolset(abc.ABC):
    @contextmanager
    def b2_args(self):
        # Write the config file, etc.
        yield []

    @staticmethod
    def bootstrap_bat_args():
        return []

    @staticmethod
    def bootstrap_sh_args():
        return []

    @staticmethod
    def cmake_generator():
        return None

    def cmake_args(self, build_dir, platform):
        args = []
        generator = self.cmake_generator()
        if generator is not None:
            args += ['-G', generator]
        return args

    @staticmethod
    def build_system_args():
        return []

    @staticmethod
    def detect(version):
        if version.hint is ToolsetType.AUTO:
            return Auto
        if version.hint is ToolsetType.MSVC or version.hint is ToolsetType.VISUAL_STUDIO:
            return MSVC
        if version.hint is ToolsetType.GCC:
            return GCC
        if version.hint is ToolsetType.MINGW:
            return MinGW
        if version.hint is ToolsetType.CLANG:
            return Clang
        if version.hint is ToolsetType.CLANG_CL:
            return ClangCL
        raise NotImplementedError(f'unrecognized toolset: {version}')

    @staticmethod
    def make(version, platform):
        # Platform is required here, since some toolsets (MinGW-w64) require
        # it for the compiler path.
        cls = Toolset.detect(version)
        if cls is MinGW:
            return MinGW(platform)
        if version.hint.is_versioned:
            return cls(version.version)
        return cls()


class Auto(Toolset):
    # Let Boost.Build do the detection.  Most commonly it means GCC on
    # Linux-likes and MSVC on Windows.

    def cmake_args(self, build_dir, platform):
        if on_windows():
            # On Windows, 'auto' means 'msvc', and we need to specify the -A
            # parameter.  This might break if none of the Visual Studio
            # generators are available, but the NMake one is, although I don't
            # know how this can be possible normally.
            return MSVC().cmake_args(build_dir, platform)
        # On Linux, if the platform wasn't specified, auto-detect everything.
        # There's no need to set -mXX flags, etc.
        if platform is Platform.AUTO:
            return super().cmake_args(build_dir, platform)
        # If a specific platform was requested, we might need to set some
        # CMake/compiler flags, like -m32/-m64.
        return GCC().cmake_args(build_dir, platform)


class MSVC(Toolset):
    def __init__(self, version=None):
        self.version = version

    def b2_toolset(self):
        if self.version is not None:
            return f'msvc-{self.version.to_msvc_version().to_boost_msvc_version()}'
        return 'msvc'

    @contextmanager
    def b2_args(self):
        yield [f'toolset={self.b2_toolset()}']

    # Note: bootstrap.bat picks up MSVC by default.

    def cmake_args(self, build_dir, platform):
        # This doesn't actually specify the generator of course, but I don't
        # want to implement VS detection logic.
        args = super().cmake_args(build_dir, platform)
        args += ['-A', platform.msvc_arch()]
        if self.version is not None:
            args += ['-T', self.version.to_msvc_version().to_cmake_toolset()]
        return args


class BoostCustom(Toolset):
    COMPILER_VERSION = 'custom'

    def __init__(self, compiler, path=None, build_options=None):
        if not compiler:
            raise RuntimeError('compiler type is required (like gcc, clang, etc.)')
        self.compiler = compiler
        version = BoostCustom.COMPILER_VERSION
        self.version = version
        path = path or ''
        path = path and full_exe_name(path)
        self.path = path
        build_options = build_options or []
        self.build_options = build_options

    def b2_toolset(self):
        if self.version:
            return f'{self.compiler}-{self.version}'
        return self.compiler

    def b2_toolset_arg(self):
        return f'toolset={self.b2_toolset()}'

    @contextmanager
    def _b2_write_config(self):
        config_file = temp_file(prefix='user_config_', suffix='.jam')
        with config_file as config_path:
            config = self.b2_format_config()
            logging.info('Using user config:\n%s', config)
            with open(config_path, mode='w') as fd:
                fd.write(config)
            yield config_path

    def _b2_format_build_options(self):
        return ''.join(f'\n    <{name}>{val}' for name, val in self.build_options)

    def b2_format_config(self):
        version = self.version and f'{self.version} '
        path = self.path and f'{self.path} '
        return f'''using {self.compiler} : {version}: {path}:{self._b2_format_build_options()}
;'''

    @contextmanager
    def b2_args(self):
        with self._b2_write_config() as config_path:
            args = []
            args.append(self.b2_toolset_arg())
            args.append(f'--user-config={config_path}')
            yield args


class CMakeCustom(Toolset):
    @staticmethod
    def cmake_generator():
        # The Visual Studio generator is the default on Windows, override it:
        return CMakeCustom.makefiles()

    @staticmethod
    def makefiles():
        if on_windows():
            if shutil.which('mingw32-make'):
                return 'MinGW Makefiles'
            return 'Unix Makefiles'
        # On Linux/Cygwin, make all the way:
        return 'Unix Makefiles'

    @staticmethod
    def nmake_or_makefiles():
        if on_windows():
            # MinGW utilities like make might be unavailable, but NMake can
            # very much be there.
            if shutil.which('nmake'):
                return 'NMake Makefiles'
        return CMakeCustom.cmake_generator()

    @staticmethod
    def _cmake_write_config(build_dir, contents):
        path = os.path.join(build_dir, 'custom_toolchain.cmake')
        with open(path, mode='w') as file:
            file.write(contents)
        return path

    @abc.abstractmethod
    def cmake_format_config(self, platform):
        pass

    def cmake_args(self, build_dir, platform):
        contents = self.cmake_format_config(platform)
        config_path = self._cmake_write_config(build_dir, contents)

        return super().cmake_args(build_dir, platform) + [
            f'-DCMAKE_TOOLCHAIN_FILE={config_path}',
        ]


class GCC(BoostCustom, CMakeCustom):
    # Force GCC.  We don't care whether it's a native Linux GCC or a
    # MinGW-flavoured GCC on Windows.

    def __init__(self):
        BoostCustom.__init__(self, 'gcc', 'g++', self.b2_build_options())
        CMakeCustom.__init__(self)

    @staticmethod
    def bootstrap_bat_args():
        return ['gcc']

    @staticmethod
    def bootstrap_sh_args():
        return ['--with-toolset=gcc']

    @staticmethod
    def b2_build_options():
        return []

    def cmake_format_config(self, platform):
        return f'''
set(CMAKE_C_COMPILER   gcc)
set(CMAKE_CXX_COMPILER g++)
{platform.cmake_toolset_file()}'''


def _gcc_or_auto():
    if shutil.which('gcc') is not None:
        return ['gcc']
    return []


class MinGW(BoostCustom, CMakeCustom):
    # It's important that Boost.Build is actually smart enough to detect the
    # GCC prefix (like "x86_64-w64-mingw32" and prepend it to other tools like
    # "ar").

    def __init__(self, platform):
        self.paths = project.mingw.MinGW(platform)
        BoostCustom.__init__(self, 'gcc', self.paths.gxx(), self.b2_build_options())
        CMakeCustom.__init__(self)

    @staticmethod
    def bootstrap_bat_args():
        # On Windows, prefer GCC if it's available.
        return _gcc_or_auto()

    @staticmethod
    def bootstrap_sh_args():
        return []

    @staticmethod
    def b2_build_options():
        return GCC.b2_build_options()

    def cmake_format_config(self, platform):
        return f'''
set(CMAKE_C_COMPILER   {self.paths.gcc()})
set(CMAKE_CXX_COMPILER {self.paths.gxx()})
set(CMAKE_AR           {self.paths.ar()})
set(CMAKE_RANLIB       {self.paths.ranlib()})
set(CMAKE_RC_COMPILER  {self.paths.windres()})
set(CMAKE_SYSTEM_NAME  Windows)
'''


class Clang(BoostCustom, CMakeCustom):
    def __init__(self):
        BoostCustom.__init__(self, 'clang', 'clang++', self.b2_build_options())
        CMakeCustom.__init__(self)

    @staticmethod
    def bootstrap_bat_args():
        # As of 1.74.0, bootstrap.bat isn't really aware of Clang, so try GCC,
        # then auto-detect.
        return _gcc_or_auto()

    @staticmethod
    def bootstrap_sh_args():
        # bootstrap.sh, on the other hand, is very much aware of Clang, and
        # it can build b2 using this compiler.
        return ['--with-toolset=clang']

    @staticmethod
    def b2_build_options():
        options = GCC.b2_build_options()
        options += [
            ('cxxflags', '-DBOOST_USE_WINDOWS_H'),

            # Even with <warnings>off, the build might sometimes fail with the
            # following error:
            #
            #     error: constant expression evaluates to -105 which cannot be narrowed to type 'boost::re_detail::cpp_regex_traits_implementation<char>::char_class_type' (aka 'unsigned int')
            ('cxxflags', '-Wno-c++11-narrowing'),
        ]
        if on_windows():
            # Prefer LLVM binutils:
            if shutil.which('llvm-ar') is not None:
                options.append(('archiver', 'llvm-ar'))
            if shutil.which('llvm-ranlib') is not None:
                options.append(('ranlib', 'llvm-ranlib'))
        return options

    def b2_format_config(self):
        # To make clang.exe/clang++.exe work on Windows, some tweaks are
        # required.  I borrowed them from CMake's Windows-Clang.cmake [1].
        # Adding them globally to Boost.Build options is described in [2].
        #
        # [1]: https://github.com/Kitware/CMake/blob/v3.18.4/Modules/Platform/Windows-Clang.cmake
        # [2]: https://stackoverflow.com/questions/2715106/how-to-create-a-new-variant-in-bjam
        return f'''project : requirements
    <target-os>windows:<define>_MT
    <target-os>windows,<variant>debug:<define>_DEBUG
    <target-os>windows,<runtime-link>static,<variant>debug:<cxxflags>"-Xclang -flto-visibility-public-std -Xclang --dependent-lib=libcmtd"
    <target-os>windows,<runtime-link>static,<variant>release:<cxxflags>"-Xclang -flto-visibility-public-std -Xclang --dependent-lib=libcmt"
    <target-os>windows,<runtime-link>shared,<variant>debug:<cxxflags>"-D_DLL -Xclang --dependent-lib=msvcrtd"
    <target-os>windows,<runtime-link>shared,<variant>release:<cxxflags>"-D_DLL -Xclang --dependent-lib=msvcrt"
;
{BoostCustom.b2_format_config(self)}
'''

    def cmake_format_config(self, platform):
        return f'''
if(CMAKE_VERSION VERSION_LESS "3.15" AND WIN32)
    set(CMAKE_C_COMPILER   clang-cl)
    set(CMAKE_CXX_COMPILER clang-cl)
else()
    set(CMAKE_C_COMPILER   clang)
    set(CMAKE_CXX_COMPILER clang++)
endif()
{platform.cmake_toolset_file()}'''

    @staticmethod
    def cmake_generator():
        return CMakeCustom.nmake_or_makefiles()


class ClangCL(CMakeCustom):
    @contextmanager
    def b2_args(self):
        yield [
            'toolset=clang-win',
            'define=BOOST_USE_WINDOWS_H',
        ]

    # There's no point in building b2 using clang-cl; clang though, presumably
    # installed alongside clang-cl, should still be used if possible.

    @staticmethod
    def bootstrap_bat_args():
        return Clang.bootstrap_bat_args()

    @staticmethod
    def bootstrap_sh_args():
        return Clang.bootstrap_sh_args()

    def cmake_format_config(self, platform):
        return f'''
set(CMAKE_C_COMPILER   clang-cl)
set(CMAKE_CXX_COMPILER clang-cl)
set(CMAKE_SYSTEM_NAME  Windows)
{platform.cmake_toolset_file()}'''

    @staticmethod
    def cmake_generator():
        return Clang.cmake_generator()