summaryrefslogtreecommitdiff
path: root/buildtools/wafsamba/samba_autoconf.py
blob: 174ca142102a038bfab7751dcf48ce469229fa58 (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
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
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
# a waf tool to add autoconf-like macros to the configure section

import Build, os, sys, Options, preproc, Logs
import string
from Configure import conf
from samba_utils import *
import samba_cross

missing_headers = set()

####################################################
# some autoconf like helpers, to make the transition
# to waf a bit easier for those used to autoconf
# m4 files

@runonce
@conf
def DEFINE(conf, d, v, add_to_cflags=False, quote=False):
    '''define a config option'''
    conf.define(d, v, quote=quote)
    if add_to_cflags:
        conf.env.append_value('CCDEFINES', d + '=' + str(v))

def hlist_to_string(conf, headers=None):
    '''convert a headers list to a set of #include lines'''
    hdrs=''
    hlist = conf.env.hlist
    if headers:
        hlist = hlist[:]
        hlist.extend(TO_LIST(headers))
    for h in hlist:
        hdrs += '#include <%s>\n' % h
    return hdrs


@conf
def COMPOUND_START(conf, msg):
    '''start a compound test'''
    def null_check_message_1(self,*k,**kw):
        return
    def null_check_message_2(self,*k,**kw):
        return

    v = getattr(conf.env, 'in_compound', [])
    if v != [] and v != 0:
        conf.env.in_compound = v + 1
        return
    conf.check_message_1(msg)
    conf.saved_check_message_1 = conf.check_message_1
    conf.check_message_1 = null_check_message_1
    conf.saved_check_message_2 = conf.check_message_2
    conf.check_message_2 = null_check_message_2
    conf.env.in_compound = 1


@conf
def COMPOUND_END(conf, result):
    '''start a compound test'''
    conf.env.in_compound -= 1
    if conf.env.in_compound != 0:
        return
    conf.check_message_1 = conf.saved_check_message_1
    conf.check_message_2 = conf.saved_check_message_2
    p = conf.check_message_2
    if result == True:
        p('ok ')
    elif result == False:
        p('not found', 'YELLOW')
    else:
        p(result)


@feature('nolink')
def nolink(self):
    '''using the nolink type in conf.check() allows us to avoid
       the link stage of a test, thus speeding it up for tests
       that where linking is not needed'''
    pass


def CHECK_HEADER(conf, h, add_headers=False, lib=None):
    '''check for a header'''
    if h in missing_headers and lib is None:
        return False
    d = h.upper().replace('/', '_')
    d = d.replace('.', '_')
    d = d.replace('-', '_')
    d = 'HAVE_%s' % d
    if CONFIG_SET(conf, d):
        if add_headers:
            if not h in conf.env.hlist:
                conf.env.hlist.append(h)
        return True

    (ccflags, ldflags) = library_flags(conf, lib)

    hdrs = hlist_to_string(conf, headers=h)
    ret = conf.check(fragment='%s\nint main(void) { return 0; }' % hdrs,
                     type='nolink',
                     execute=0,
                     ccflags=ccflags,
                     msg="Checking for header %s" % h)
    if not ret:
        missing_headers.add(h)
        return False

    conf.DEFINE(d, 1)
    if add_headers and not h in conf.env.hlist:
        conf.env.hlist.append(h)
    return ret


@conf
def CHECK_HEADERS(conf, headers, add_headers=False, together=False, lib=None):
    '''check for a list of headers

    when together==True, then the headers accumulate within this test.
    This is useful for interdependent headers
    '''
    ret = True
    if not add_headers and together:
        saved_hlist = conf.env.hlist[:]
        set_add_headers = True
    else:
        set_add_headers = add_headers
    for hdr in TO_LIST(headers):
        if not CHECK_HEADER(conf, hdr, set_add_headers, lib=lib):
            ret = False
    if not add_headers and together:
        conf.env.hlist = saved_hlist
    return ret


def header_list(conf, headers=None, lib=None):
    '''form a list of headers which exist, as a string'''
    hlist=[]
    if headers is not None:
        for h in TO_LIST(headers):
            if CHECK_HEADER(conf, h, add_headers=False, lib=lib):
                hlist.append(h)
    return hlist_to_string(conf, headers=hlist)


@conf
def CHECK_TYPE(conf, t, alternate=None, headers=None, define=None, lib=None, msg=None):
    '''check for a single type'''
    if define is None:
        define = 'HAVE_' + t.upper().replace(' ', '_')
    if msg is None:
        msg='Checking for %s' % t
    ret = CHECK_CODE(conf, '%s _x' % t,
                     define,
                     execute=False,
                     headers=headers,
                     local_include=False,
                     msg=msg,
                     lib=lib,
                     link=False)
    if not ret and alternate:
        conf.DEFINE(t, alternate)
    return ret


@conf
def CHECK_TYPES(conf, list, headers=None, define=None, alternate=None, lib=None):
    '''check for a list of types'''
    ret = True
    for t in TO_LIST(list):
        if not CHECK_TYPE(conf, t, headers=headers,
                          define=define, alternate=alternate, lib=lib):
            ret = False
    return ret


@conf
def CHECK_TYPE_IN(conf, t, headers=None, alternate=None, define=None):
    '''check for a single type with a header'''
    return CHECK_TYPE(conf, t, headers=headers, alternate=alternate, define=define)


@conf
def CHECK_VARIABLE(conf, v, define=None, always=False,
                   headers=None, msg=None, lib=None):
    '''check for a variable declaration (or define)'''
    if define is None:
        define = 'HAVE_%s' % v.upper()

    if msg is None:
        msg="Checking for variable %s" % v

    return CHECK_CODE(conf,
                      # we need to make sure the compiler doesn't
                      # optimize it out...
                      '''
                      #ifndef %s
                      void *_x; _x=(void *)&%s; return (int)_x;
                      #endif
                      return 0
                      ''' % (v, v),
                      execute=False,
                      link=False,
                      msg=msg,
                      local_include=False,
                      lib=lib,
                      headers=headers,
                      define=define,
                      always=always)


@conf
def CHECK_DECLS(conf, vars, reverse=False, headers=None, always=False):
    '''check a list of variable declarations, using the HAVE_DECL_xxx form
       of define

       When reverse==True then use HAVE_xxx_DECL instead of HAVE_DECL_xxx
       '''
    ret = True
    for v in TO_LIST(vars):
        if not reverse:
            define='HAVE_DECL_%s' % v.upper()
        else:
            define='HAVE_%s_DECL' % v.upper()
        if not CHECK_VARIABLE(conf, v,
                              define=define,
                              headers=headers,
                              msg='Checking for declaration of %s' % v,
                              always=always):
            ret = False
    return ret


def CHECK_FUNC(conf, f, link=True, lib=None, headers=None):
    '''check for a function'''
    define='HAVE_%s' % f.upper()

    ret = False

    conf.COMPOUND_START('Checking for %s' % f)

    if link is None or link == True:
        ret = CHECK_CODE(conf,
                         # this is based on the autoconf strategy
                         '''
                         #define %s __fake__%s
                         #ifdef HAVE_LIMITS_H
                         # include <limits.h>
                         #else
                         # include <assert.h>
                         #endif
                         #undef %s
                         #if defined __stub_%s || defined __stub___%s
                         #error "bad glibc stub"
                         #endif
                         extern char %s();
                         int main() { return %s(); }
                         ''' % (f, f, f, f, f, f, f),
                         execute=False,
                         link=True,
                         addmain=False,
                         add_headers=False,
                         define=define,
                         local_include=False,
                         lib=lib,
                         headers=headers,
                         msg='Checking for %s' % f)

        if not ret:
            ret = CHECK_CODE(conf,
                             # it might be a macro
                             # we need to make sure the compiler doesn't
                             # optimize it out...
                             'void *__x = (void *)%s; return (int)__x' % f,
                             execute=False,
                             link=True,
                             addmain=True,
                             add_headers=True,
                             define=define,
                             local_include=False,
                             lib=lib,
                             headers=headers,
                             msg='Checking for macro %s' % f)

    if not ret and (link is None or link == False):
        ret = CHECK_VARIABLE(conf, f,
                             define=define,
                             headers=headers,
                             msg='Checking for declaration of %s' % f)
    conf.COMPOUND_END(ret)
    return ret


@conf
def CHECK_FUNCS(conf, list, link=True, lib=None, headers=None):
    '''check for a list of functions'''
    ret = True
    for f in TO_LIST(list):
        if not CHECK_FUNC(conf, f, link=link, lib=lib, headers=headers):
            ret = False
    return ret


@conf
def CHECK_SIZEOF(conf, vars, headers=None, define=None):
    '''check the size of a type'''
    ret = True
    for v in TO_LIST(vars):
        v_define = define
        if v_define is None:
            v_define = 'SIZEOF_%s' % v.upper().replace(' ', '_')
        if not CHECK_CODE(conf,
                          'printf("%%u", (unsigned)sizeof(%s))' % v,
                          define=v_define,
                          execute=True,
                          define_ret=True,
                          quote=False,
                          headers=headers,
                          local_include=False,
                          msg="Checking size of %s" % v):
            ret = False
    return ret



@conf
def CHECK_CODE(conf, code, define,
               always=False, execute=False, addmain=True,
               add_headers=True, mandatory=False,
               headers=None, msg=None, cflags='', includes='# .',
               local_include=True, lib=None, link=True,
               define_ret=False, quote=False,
               on_target=True):
    '''check if some code compiles and/or runs'''

    if CONFIG_SET(conf, define):
        return True

    if headers is not None:
        CHECK_HEADERS(conf, headers=headers, lib=lib)

    if add_headers:
        hdrs = header_list(conf, headers=headers, lib=lib)
    else:
        hdrs = ''
    if execute:
        execute = 1
    else:
        execute = 0

    defs = conf.get_config_header()

    if addmain:
        fragment='%s\n%s\n int main(void) { %s; return 0; }\n' % (defs, hdrs, code)
    else:
        fragment='%s\n%s\n%s\n' % (defs, hdrs, code)

    if msg is None:
        msg="Checking for %s" % define

    cflags = TO_LIST(cflags)

    if local_include:
        cflags.append('-I%s' % conf.curdir)

    if not link:
        type='nolink'
    else:
        type='cprogram'

    uselib = TO_LIST(lib)

    (ccflags, ldflags) = library_flags(conf, uselib)

    cflags.extend(ccflags)

    if on_target:
        exec_args = conf.SAMBA_CROSS_ARGS(msg=msg)
    else:
        exec_args = []

    conf.COMPOUND_START(msg)

    ret = conf.check(fragment=fragment,
                     execute=execute,
                     define_name = define,
                     mandatory = mandatory,
                     ccflags=cflags,
                     ldflags=ldflags,
                     includes=includes,
                     uselib=uselib,
                     type=type,
                     msg=msg,
                     quote=quote,
                     exec_args=exec_args,
                     define_ret=define_ret)
    if not ret and CONFIG_SET(conf, define):
        # sometimes conf.check() returns false, but it
        # sets the define. Maybe a waf bug?
        ret = True
    if ret:
        if not define_ret:
            conf.DEFINE(define, 1)
            conf.COMPOUND_END(True)
        else:
            conf.COMPOUND_END(conf.env[define])
        return True
    if always:
        conf.DEFINE(define, 0)
    conf.COMPOUND_END(False)
    return False



@conf
def CHECK_STRUCTURE_MEMBER(conf, structname, member,
                           always=False, define=None, headers=None):
    '''check for a structure member'''
    if define is None:
        define = 'HAVE_%s' % member.upper()
    return CHECK_CODE(conf,
                      '%s s; void *_x; _x=(void *)&s.%s' % (structname, member),
                      define,
                      execute=False,
                      link=False,
                      always=always,
                      headers=headers,
                      local_include=False,
                      msg="Checking for member %s in %s" % (member, structname))


@conf
def CHECK_CFLAGS(conf, cflags):
    '''check if the given cflags are accepted by the compiler
    '''
    return conf.check(fragment='int main(void) { return 0; }\n',
                      execute=0,
                      type='nolink',
                      ccflags=cflags,
                      msg="Checking compiler accepts %s" % cflags)

@conf
def CHECK_LDFLAGS(conf, ldflags):
    '''check if the given ldflags are accepted by the linker
    '''
    return conf.check(fragment='int main(void) { return 0; }\n',
                      execute=0,
                      ldflags=ldflags,
                      msg="Checking linker accepts %s" % ldflags)


@conf
def CONFIG_GET(conf, option):
    '''return True if a configuration option was found'''
    if (option in conf.env):
        return conf.env[option]
    else:
        return None

@conf
def CONFIG_SET(conf, option):
    '''return True if a configuration option was found'''
    return (option in conf.env) and (conf.env[option] != ())
Build.BuildContext.CONFIG_SET = CONFIG_SET
Build.BuildContext.CONFIG_GET = CONFIG_GET


def library_flags(self, libs):
    '''work out flags from pkg_config'''
    ccflags = []
    ldflags = []
    for lib in TO_LIST(libs):
        inc_path = getattr(self.env, 'CPPPATH_%s' % lib.upper(), [])
        lib_path = getattr(self.env, 'LIBPATH_%s' % lib.upper(), [])
        ccflags.extend(['-I%s' % i for i in inc_path])
        ldflags.extend(['-L%s' % l for l in lib_path])
        extra_ccflags = TO_LIST(getattr(self.env, 'CCFLAGS_%s' % lib.upper(), []))
        extra_ldflags = TO_LIST(getattr(self.env, 'LDFLAGS_%s' % lib.upper(), []))
        ccflags.extend(extra_ccflags)
        ldflags.extend(extra_ldflags)
    if 'EXTRA_LDFLAGS' in self.env:
        ldflags.extend(self.env['EXTRA_LDFLAGS'])

    ccflags = unique_list(ccflags)
    ldflags = unique_list(ldflags)
    return (ccflags, ldflags)


@conf
def CHECK_LIB(conf, libs, mandatory=False, empty_decl=True, set_target=True, shlib=False):
    '''check if a set of libraries exist as system libraries

    returns the sublist of libs that do exist as a syslib or []
    '''

    fragment= '''
int foo()
{
    int v = 2;
    return v*2;
}
'''
    ret = []
    liblist  = TO_LIST(libs)
    for lib in liblist[:]:
        if GET_TARGET_TYPE(conf, lib) == 'SYSLIB':
            ret.append(lib)
            continue

        (ccflags, ldflags) = library_flags(conf, lib)
        if shlib:
            res = conf.check(features='cc cshlib', fragment=fragment, lib=lib, uselib_store=lib, ccflags=ccflags, ldflags=ldflags)
        else:
            res = conf.check(lib=lib, uselib_store=lib, ccflags=ccflags, ldflags=ldflags)

        if not res:
            if mandatory:
                Logs.error("Mandatory library '%s' not found for functions '%s'" % (lib, list))
                sys.exit(1)
            if empty_decl:
                # if it isn't a mandatory library, then remove it from dependency lists
                if set_target:
                    SET_TARGET_TYPE(conf, lib, 'EMPTY')
        else:
            conf.define('HAVE_LIB%s' % lib.upper().replace('-','_'), 1)
            conf.env['LIB_' + lib.upper()] = lib
            if set_target:
                conf.SET_TARGET_TYPE(lib, 'SYSLIB')
            ret.append(lib)

    return ret



@conf
def CHECK_FUNCS_IN(conf, list, library, mandatory=False, checklibc=False,
                   headers=None, link=True, empty_decl=True, set_target=True):
    """
    check that the functions in 'list' are available in 'library'
    if they are, then make that library available as a dependency

    if the library is not available and mandatory==True, then
    raise an error.

    If the library is not available and mandatory==False, then
    add the library to the list of dependencies to remove from
    build rules

    optionally check for the functions first in libc
    """
    remaining = TO_LIST(list)
    liblist   = TO_LIST(library)

    # check if some already found
    for f in remaining[:]:
        if CONFIG_SET(conf, 'HAVE_%s' % f.upper()):
            remaining.remove(f)

    # see if the functions are in libc
    if checklibc:
        for f in remaining[:]:
            if CHECK_FUNC(conf, f, link=True, headers=headers):
                remaining.remove(f)

    if remaining == []:
        for lib in liblist:
            if GET_TARGET_TYPE(conf, lib) != 'SYSLIB' and empty_decl:
                SET_TARGET_TYPE(conf, lib, 'EMPTY')
        return True

    checklist = conf.CHECK_LIB(liblist, empty_decl=empty_decl, set_target=set_target)
    for lib in liblist[:]:
        if not lib in checklist and mandatory:
            Logs.error("Mandatory library '%s' not found for functions '%s'" % (lib, list))
            sys.exit(1)

    ret = True
    for f in remaining:
        if not CHECK_FUNC(conf, f, lib=' '.join(checklist), headers=headers, link=link):
            ret = False

    return ret


@conf
def IN_LAUNCH_DIR(conf):
    '''return True if this rule is being run from the launch directory'''
    return os.path.realpath(conf.curdir) == os.path.realpath(Options.launch_dir)
Options.Handler.IN_LAUNCH_DIR = IN_LAUNCH_DIR


@conf
def SAMBA_CONFIG_H(conf, path=None):
    '''write out config.h in the right directory'''
    # we don't want to produce a config.h in places like lib/replace
    # when we are building projects that depend on lib/replace
    if not IN_LAUNCH_DIR(conf):
        return

    if Options.options.developer:
        # we add these here to ensure that -Wstrict-prototypes is not set during configure
        conf.ADD_CFLAGS('-Wall -g -Wshadow -Wstrict-prototypes -Wpointer-arith -Wcast-align -Wwrite-strings -Werror-implicit-function-declaration -Wformat=2 -Wno-format-y2k -Wmissing-prototypes',
                        testflags=True)
        if os.getenv('TOPLEVEL_BUILD'):
            conf.ADD_CFLAGS('-Wcast-qual', testflags=True)
        conf.env.DEVELOPER_MODE = True

    if Options.options.picky_developer:
        conf.ADD_CFLAGS('-Werror', testflags=True)

    if Options.options.fatal_errors:
        conf.ADD_CFLAGS('-Wfatal-errors', testflags=True)

    if Options.options.pedantic:
        conf.ADD_CFLAGS('-W', testflags=True)

    if path is None:
        conf.write_config_header('config.h', top=True)
    else:
        conf.write_config_header(path)
    conf.SAMBA_CROSS_CHECK_COMPLETE()


@conf
def CONFIG_PATH(conf, name, default):
    '''setup a configurable path'''
    if not name in conf.env:
        if default[0] == '/':
            conf.env[name] = default
        else:
            conf.env[name] = conf.env['PREFIX'] + default

@conf
def ADD_CFLAGS(conf, flags, testflags=False):
    '''add some CFLAGS to the command line
       optionally set testflags to ensure all the flags work
    '''
    if testflags:
        ok_flags=[]
        for f in flags.split():
            if CHECK_CFLAGS(conf, f):
                ok_flags.append(f)
        flags = ok_flags
    if not 'EXTRA_CFLAGS' in conf.env:
        conf.env['EXTRA_CFLAGS'] = []
    conf.env['EXTRA_CFLAGS'].extend(TO_LIST(flags))

@conf
def ADD_LDFLAGS(conf, flags, testflags=False):
    '''add some LDFLAGS to the command line
       optionally set testflags to ensure all the flags work

       this will return the flags that are added, if any
    '''
    if testflags:
        ok_flags=[]
        for f in flags.split():
            if CHECK_LDFLAGS(conf, f):
                ok_flags.append(f)
        flags = ok_flags
    if not 'EXTRA_LDFLAGS' in conf.env:
        conf.env['EXTRA_LDFLAGS'] = []
    conf.env['EXTRA_LDFLAGS'].extend(TO_LIST(flags))
    return flags


@conf
def ADD_EXTRA_INCLUDES(conf, includes):
    '''add some extra include directories to all builds'''
    if not 'EXTRA_INCLUDES' in conf.env:
        conf.env['EXTRA_INCLUDES'] = []
    conf.env['EXTRA_INCLUDES'].extend(TO_LIST(includes))



def CURRENT_CFLAGS(bld, target, cflags, hide_symbols=False):
    '''work out the current flags. local flags are added first'''
    if not 'EXTRA_CFLAGS' in bld.env:
        list = []
    else:
        list = bld.env['EXTRA_CFLAGS'];
    ret = TO_LIST(cflags)
    ret.extend(list)
    if hide_symbols and bld.env.HAVE_VISIBILITY_ATTR:
        ret.append('-fvisibility=hidden')
    return ret


@conf
def CHECK_CC_ENV(conf):
    """trim whitespaces from 'CC'.
    The build farm sometimes puts a space at the start"""
    if os.environ.get('CC'):
        conf.env.CC = TO_LIST(os.environ.get('CC'))
        if len(conf.env.CC) == 1:
            # make for nicer logs if just a single command
            conf.env.CC = conf.env.CC[0]


@conf
def SETUP_CONFIGURE_CACHE(conf, enable):
    '''enable/disable cache of configure results'''
    if enable:
        # when -C is chosen, we will use a private cache and will
        # not look into system includes. This roughtly matches what
        # autoconf does with -C
        cache_path = os.path.join(conf.blddir, '.confcache')
        mkdir_p(cache_path)
        Options.cache_global = os.environ['WAFCACHE'] = cache_path
    else:
        # when -C is not chosen we will not cache configure checks
        # We set the recursion limit low to prevent waf from spending
        # a lot of time on the signatures of the files.
        Options.cache_global = os.environ['WAFCACHE'] = ''
        preproc.recursion_limit = 1
    # in either case we don't need to scan system includes
    preproc.go_absolute = False