buildtools/wafsamba/samba_autoconf.py

   1 # a waf tool to add autoconf-like macros to the configure section
   2
   3 import Build, os, sys, Options, preproc, Logs
   4 import string
   5 from Configure import conf
   6 from samba_utils import *
   7 import samba_cross
   8
   9 missing_headers = set()
  10
  11 ####################################################
  12 # some autoconf like helpers, to make the transition
  13 # to waf a bit easier for those used to autoconf
  14 # m4 files
  15
  16 @runonce
  17 @conf
  18 def DEFINE(conf, d, v, add_to_cflags=False, quote=False):
  19     '''define a config option'''
  20     conf.define(d, v, quote=quote)
  21     if add_to_cflags:
  22         conf.env.append_value('CCDEFINES', d + '=' + str(v))
  23
  24 def hlist_to_string(conf, headers=None):
  25     '''convert a headers list to a set of #include lines'''
  26     hdrs=''
  27     hlist = conf.env.hlist
  28     if headers:
  29         hlist = hlist[:]
  30         hlist.extend(TO_LIST(headers))
  31     for h in hlist:
  32         hdrs += '#include <%s>\n' % h
  33     return hdrs
  34
  35
  36 @conf
  37 def COMPOUND_START(conf, msg):
  38     '''start a compound test'''
  39     def null_check_message_1(self,*k,**kw):
  40         return
  41     def null_check_message_2(self,*k,**kw):
  42         return
  43
  44     v = getattr(conf.env, 'in_compound', [])
  45     if v != [] and v != 0:
  46         conf.env.in_compound = v + 1
  47         return
  48     conf.check_message_1(msg)
  49     conf.saved_check_message_1 = conf.check_message_1
  50     conf.check_message_1 = null_check_message_1
  51     conf.saved_check_message_2 = conf.check_message_2
  52     conf.check_message_2 = null_check_message_2
  53     conf.env.in_compound = 1
  54
  55
  56 @conf
  57 def COMPOUND_END(conf, result):
  58     '''start a compound test'''
  59     conf.env.in_compound -= 1
  60     if conf.env.in_compound != 0:
  61         return
  62     conf.check_message_1 = conf.saved_check_message_1
  63     conf.check_message_2 = conf.saved_check_message_2
  64     p = conf.check_message_2
  65     if result is True:
  66         p('ok')
  67     elif not result:
  68         p('not found', 'YELLOW')
  69     else:
  70         p(result)
  71
  72
  73 @feature('nolink')
  74 def nolink(self):
  75     '''using the nolink type in conf.check() allows us to avoid
  76        the link stage of a test, thus speeding it up for tests
  77        that where linking is not needed'''
  78     pass
  79
  80
  81 def CHECK_HEADER(conf, h, add_headers=False, lib=None):
  82     '''check for a header'''
  83     if h in missing_headers and lib is None:
  84         return False
  85     d = h.upper().replace('/', '_')
  86     d = d.replace('.', '_')
  87     d = d.replace('-', '_')
  88     d = 'HAVE_%s' % d
  89     if CONFIG_SET(conf, d):
  90         if add_headers:
  91             if not h in conf.env.hlist:
  92                 conf.env.hlist.append(h)
  93         return True
  94
  95     (ccflags, ldflags, cpppath) = library_flags(conf, lib)
  96
  97     hdrs = hlist_to_string(conf, headers=h)
  98     if lib is None:
  99         lib = ""
 100     ret = conf.check(fragment='%s\nint main(void) { return 0; }' % hdrs,
 101                      type='nolink',
 102                      execute=0,
 103                      ccflags=ccflags,
 104                      includes=cpppath,
 105                      uselib=lib.upper(),
 106                      msg="Checking for header %s" % h)
 107     if not ret:
 108         missing_headers.add(h)
 109         return False
 110
 111     conf.DEFINE(d, 1)
 112     if add_headers and not h in conf.env.hlist:
 113         conf.env.hlist.append(h)
 114     return ret
 115
 116
 117 @conf
 118 def CHECK_HEADERS(conf, headers, add_headers=False, together=False, lib=None):
 119     '''check for a list of headers
 120
 121     when together==True, then the headers accumulate within this test.
 122     This is useful for interdependent headers
 123     '''
 124     ret = True
 125     if not add_headers and together:
 126         saved_hlist = conf.env.hlist[:]
 127         set_add_headers = True
 128     else:
 129         set_add_headers = add_headers
 130     for hdr in TO_LIST(headers):
 131         if not CHECK_HEADER(conf, hdr, set_add_headers, lib=lib):
 132             ret = False
 133     if not add_headers and together:
 134         conf.env.hlist = saved_hlist
 135     return ret
 136
 137
 138 def header_list(conf, headers=None, lib=None):
 139     '''form a list of headers which exist, as a string'''
 140     hlist=[]
 141     if headers is not None:
 142         for h in TO_LIST(headers):
 143             if CHECK_HEADER(conf, h, add_headers=False, lib=lib):
 144                 hlist.append(h)
 145     return hlist_to_string(conf, headers=hlist)
 146
 147
 148 @conf
 149 def CHECK_TYPE(conf, t, alternate=None, headers=None, define=None, lib=None, msg=None):
 150     '''check for a single type'''
 151     if define is None:
 152         define = 'HAVE_' + t.upper().replace(' ', '_')
 153     if msg is None:
 154         msg='Checking for %s' % t
 155     ret = CHECK_CODE(conf, '%s _x' % t,
 156                      define,
 157                      execute=False,
 158                      headers=headers,
 159                      local_include=False,
 160                      msg=msg,
 161                      lib=lib,
 162                      link=False)
 163     if not ret and alternate:
 164         conf.DEFINE(t, alternate)
 165     return ret
 166
 167
 168 @conf
 169 def CHECK_TYPES(conf, list, headers=None, define=None, alternate=None, lib=None):
 170     '''check for a list of types'''
 171     ret = True
 172     for t in TO_LIST(list):
 173         if not CHECK_TYPE(conf, t, headers=headers,
 174                           define=define, alternate=alternate, lib=lib):
 175             ret = False
 176     return ret
 177
 178
 179 @conf
 180 def CHECK_TYPE_IN(conf, t, headers=None, alternate=None, define=None):
 181     '''check for a single type with a header'''
 182     return CHECK_TYPE(conf, t, headers=headers, alternate=alternate, define=define)
 183
 184
 185 @conf
 186 def CHECK_VARIABLE(conf, v, define=None, always=False,
 187                    headers=None, msg=None, lib=None):
 188     '''check for a variable declaration (or define)'''
 189     if define is None:
 190         define = 'HAVE_%s' % v.upper()
 191
 192     if msg is None:
 193         msg="Checking for variable %s" % v
 194
 195     return CHECK_CODE(conf,
 196                       # we need to make sure the compiler doesn't
 197                       # optimize it out...
 198                       '''
 199                       #ifndef %s
 200                       void *_x; _x=(void *)&%s; return (int)_x;
 201                       #endif
 202                       return 0
 203                       ''' % (v, v),
 204                       execute=False,
 205                       link=False,
 206                       msg=msg,
 207                       local_include=False,
 208                       lib=lib,
 209                       headers=headers,
 210                       define=define,
 211                       always=always)
 212
 213
 214 @conf
 215 def CHECK_DECLS(conf, vars, reverse=False, headers=None, always=False):
 216     '''check a list of variable declarations, using the HAVE_DECL_xxx form
 217        of define
 218
 219        When reverse==True then use HAVE_xxx_DECL instead of HAVE_DECL_xxx
 220        '''
 221     ret = True
 222     for v in TO_LIST(vars):
 223         if not reverse:
 224             define='HAVE_DECL_%s' % v.upper()
 225         else:
 226             define='HAVE_%s_DECL' % v.upper()
 227         if not CHECK_VARIABLE(conf, v,
 228                               define=define,
 229                               headers=headers,
 230                               msg='Checking for declaration of %s' % v,
 231                               always=always):
 232             ret = False
 233     return ret
 234
 235
 236 def CHECK_FUNC(conf, f, link=True, lib=None, headers=None):
 237     '''check for a function'''
 238     define='HAVE_%s' % f.upper()
 239
 240     ret = False
 241
 242     conf.COMPOUND_START('Checking for %s' % f)
 243
 244     if link is None or link:
 245         ret = CHECK_CODE(conf,
 246                          # this is based on the autoconf strategy
 247                          '''
 248                          #define %s __fake__%s
 249                          #ifdef HAVE_LIMITS_H
 250                          # include <limits.h>
 251                          #else
 252                          # include <assert.h>
 253                          #endif
 254                          #undef %s
 255                          #if defined __stub_%s || defined __stub___%s
 256                          #error "bad glibc stub"
 257                          #endif
 258                          extern char %s();
 259                          int main() { return %s(); }
 260                          ''' % (f, f, f, f, f, f, f),
 261                          execute=False,
 262                          link=True,
 263                          addmain=False,
 264                          add_headers=False,
 265                          define=define,
 266                          local_include=False,
 267                          lib=lib,
 268                          headers=headers,
 269                          msg='Checking for %s' % f)
 270
 271         if not ret:
 272             ret = CHECK_CODE(conf,
 273                              # it might be a macro
 274                              # we need to make sure the compiler doesn't
 275                              # optimize it out...
 276                              'void *__x = (void *)%s; return (int)__x' % f,
 277                              execute=False,
 278                              link=True,
 279                              addmain=True,
 280                              add_headers=True,
 281                              define=define,
 282                              local_include=False,
 283                              lib=lib,
 284                              headers=headers,
 285                              msg='Checking for macro %s' % f)
 286
 287     if not ret and (link is None or not link):
 288         ret = CHECK_VARIABLE(conf, f,
 289                              define=define,
 290                              headers=headers,
 291                              msg='Checking for declaration of %s' % f)
 292     conf.COMPOUND_END(ret)
 293     return ret
 294
 295
 296 @conf
 297 def CHECK_FUNCS(conf, list, link=True, lib=None, headers=None):
 298     '''check for a list of functions'''
 299     ret = True
 300     for f in TO_LIST(list):
 301         if not CHECK_FUNC(conf, f, link=link, lib=lib, headers=headers):
 302             ret = False
 303     return ret
 304
 305
 306 @conf
 307 def CHECK_SIZEOF(conf, vars, headers=None, define=None):
 308     '''check the size of a type'''
 309     ret = True
 310     for v in TO_LIST(vars):
 311         v_define = define
 312         if v_define is None:
 313             v_define = 'SIZEOF_%s' % v.upper().replace(' ', '_')
 314         if not CHECK_CODE(conf,
 315                           'printf("%%u", (unsigned)sizeof(%s))' % v,
 316                           define=v_define,
 317                           execute=True,
 318                           define_ret=True,
 319                           quote=False,
 320                           headers=headers,
 321                           local_include=False,
 322                           msg="Checking size of %s" % v):
 323             ret = False
 324     return ret
 325
 326 @conf
 327 def CHECK_VALUEOF(conf, v, headers=None, define=None):
 328     '''check the value of a variable/define'''
 329     ret = True
 330     v_define = define
 331     if v_define is None:
 332         v_define = 'VALUEOF_%s' % v.upper().replace(' ', '_')
 333     if CHECK_CODE(conf,
 334                   'printf("%%u", (unsigned)(%s))' % v,
 335                   define=v_define,
 336                   execute=True,
 337                   define_ret=True,
 338                   quote=False,
 339                   headers=headers,
 340                   local_include=False,
 341                   msg="Checking value of %s" % v):
 342         return int(conf.env[v_define])
 343
 344     return None
 345
 346 @conf
 347 def CHECK_CODE(conf, code, define,
 348                always=False, execute=False, addmain=True,
 349                add_headers=True, mandatory=False,
 350                headers=None, msg=None, cflags='', includes='# .',
 351                local_include=True, lib=None, link=True,
 352                define_ret=False, quote=False,
 353                on_target=True):
 354     '''check if some code compiles and/or runs'''
 355
 356     if CONFIG_SET(conf, define):
 357         return True
 358
 359     if headers is not None:
 360         CHECK_HEADERS(conf, headers=headers, lib=lib)
 361
 362     if add_headers:
 363         hdrs = header_list(conf, headers=headers, lib=lib)
 364     else:
 365         hdrs = ''
 366     if execute:
 367         execute = 1
 368     else:
 369         execute = 0
 370
 371     defs = conf.get_config_header()
 372
 373     if addmain:
 374         fragment='%s\n%s\n int main(void) { %s; return 0; }\n' % (defs, hdrs, code)
 375     else:
 376         fragment='%s\n%s\n%s\n' % (defs, hdrs, code)
 377
 378     if msg is None:
 379         msg="Checking for %s" % define
 380
 381     cflags = TO_LIST(cflags)
 382
 383     if local_include:
 384         cflags.append('-I%s' % conf.curdir)
 385
 386     if not link:
 387         type='nolink'
 388     else:
 389         type='cprogram'
 390
 391     uselib = TO_LIST(lib)
 392
 393     (ccflags, ldflags, cpppath) = library_flags(conf, uselib)
 394
 395     includes = TO_LIST(includes)
 396     includes.extend(cpppath)
 397
 398     uselib = [l.upper() for l in uselib]
 399
 400     cflags.extend(ccflags)
 401
 402     if on_target:
 403         exec_args = conf.SAMBA_CROSS_ARGS(msg=msg)
 404     else:
 405         exec_args = []
 406
 407     conf.COMPOUND_START(msg)
 408
 409     ret = conf.check(fragment=fragment,
 410                      execute=execute,
 411                      define_name = define,
 412                      mandatory = mandatory,
 413                      ccflags=cflags,
 414                      ldflags=ldflags,
 415                      includes=includes,
 416                      uselib=uselib,
 417                      type=type,
 418                      msg=msg,
 419                      quote=quote,
 420                      exec_args=exec_args,
 421                      define_ret=define_ret)
 422     if not ret and CONFIG_SET(conf, define):
 423         # sometimes conf.check() returns false, but it
 424         # sets the define. Maybe a waf bug?
 425         ret = True
 426     if ret:
 427         if not define_ret:
 428             conf.DEFINE(define, 1)
 429             conf.COMPOUND_END(True)
 430         else:
 431             conf.COMPOUND_END(conf.env[define])
 432         return True
 433     if always:
 434         conf.DEFINE(define, 0)
 435     conf.COMPOUND_END(False)
 436     return False
 437
 438
 439
 440 @conf
 441 def CHECK_STRUCTURE_MEMBER(conf, structname, member,
 442                            always=False, define=None, headers=None):
 443     '''check for a structure member'''
 444     if define is None:
 445         define = 'HAVE_%s' % member.upper()
 446     return CHECK_CODE(conf,
 447                       '%s s; void *_x; _x=(void *)&s.%s' % (structname, member),
 448                       define,
 449                       execute=False,
 450                       link=False,
 451                       always=always,
 452                       headers=headers,
 453                       local_include=False,
 454                       msg="Checking for member %s in %s" % (member, structname))
 455
 456
 457 @conf
 458 def CHECK_CFLAGS(conf, cflags, fragment='int main(void) { return 0; }\n'):
 459     '''check if the given cflags are accepted by the compiler
 460     '''
 461     return conf.check(fragment=fragment,
 462                       execute=0,
 463                       type='nolink',
 464                       ccflags=cflags,
 465                       msg="Checking compiler accepts %s" % cflags)
 466
 467 @conf
 468 def CHECK_LDFLAGS(conf, ldflags):
 469     '''check if the given ldflags are accepted by the linker
 470     '''
 471     return conf.check(fragment='int main(void) { return 0; }\n',
 472                       execute=0,
 473                       ldflags=ldflags,
 474                       msg="Checking linker accepts %s" % ldflags)
 475
 476
 477 @conf
 478 def CONFIG_GET(conf, option):
 479     '''return True if a configuration option was found'''
 480     if (option in conf.env):
 481         return conf.env[option]
 482     else:
 483         return None
 484
 485 @conf
 486 def CONFIG_SET(conf, option):
 487     '''return True if a configuration option was found'''
 488     if option not in conf.env:
 489         return False
 490     v = conf.env[option]
 491     if v is None:
 492         return False
 493     if v == []:
 494         return False
 495     if v == ():
 496         return False
 497     return True
 498 Build.BuildContext.CONFIG_SET = CONFIG_SET
 499 Build.BuildContext.CONFIG_GET = CONFIG_GET
 500
 501
 502 def library_flags(self, libs):
 503     '''work out flags from pkg_config'''
 504     ccflags = []
 505     ldflags = []
 506     cpppath = []
 507     for lib in TO_LIST(libs):
 508         # note that we do not add the -I and -L in here, as that is added by the waf
 509         # core. Adding it here would just change the order that it is put on the link line
 510         # which can cause system paths to be added before internal libraries
 511         extra_ccflags = TO_LIST(getattr(self.env, 'CCFLAGS_%s' % lib.upper(), []))
 512         extra_ldflags = TO_LIST(getattr(self.env, 'LDFLAGS_%s' % lib.upper(), []))
 513         extra_cpppath = TO_LIST(getattr(self.env, 'CPPPATH_%s' % lib.upper(), []))
 514         ccflags.extend(extra_ccflags)
 515         ldflags.extend(extra_ldflags)
 516         cpppath.extend(extra_cpppath)
 517     if 'EXTRA_LDFLAGS' in self.env:
 518         ldflags.extend(self.env['EXTRA_LDFLAGS'])
 519
 520     ccflags = unique_list(ccflags)
 521     ldflags = unique_list(ldflags)
 522     cpppath = unique_list(cpppath)
 523     return (ccflags, ldflags, cpppath)
 524
 525
 526 @conf
 527 def CHECK_LIB(conf, libs, mandatory=False, empty_decl=True, set_target=True, shlib=False):
 528     '''check if a set of libraries exist as system libraries
 529
 530     returns the sublist of libs that do exist as a syslib or []
 531     '''
 532
 533     fragment= '''
 534 int foo()
 535 {
 536     int v = 2;
 537     return v*2;
 538 }
 539 '''
 540     ret = []
 541     liblist  = TO_LIST(libs)
 542     for lib in liblist[:]:
 543         if GET_TARGET_TYPE(conf, lib) == 'SYSLIB':
 544             ret.append(lib)
 545             continue
 546
 547         (ccflags, ldflags, cpppath) = library_flags(conf, lib)
 548         if shlib:
 549             res = conf.check(features='cc cshlib', fragment=fragment, lib=lib, uselib_store=lib, ccflags=ccflags, ldflags=ldflags, uselib=lib.upper())
 550         else:
 551             res = conf.check(lib=lib, uselib_store=lib, ccflags=ccflags, ldflags=ldflags, uselib=lib.upper())
 552
 553         if not res:
 554             if mandatory:
 555                 Logs.error("Mandatory library '%s' not found for functions '%s'" % (lib, list))
 556                 sys.exit(1)
 557             if empty_decl:
 558                 # if it isn't a mandatory library, then remove it from dependency lists
 559                 if set_target:
 560                     SET_TARGET_TYPE(conf, lib, 'EMPTY')
 561         else:
 562             conf.define('HAVE_LIB%s' % lib.upper().replace('-','_'), 1)
 563             conf.env['LIB_' + lib.upper()] = lib
 564             if set_target:
 565                 conf.SET_TARGET_TYPE(lib, 'SYSLIB')
 566             ret.append(lib)
 567
 568     return ret
 569
 570
 571
 572 @conf
 573 def CHECK_FUNCS_IN(conf, list, library, mandatory=False, checklibc=False,
 574                    headers=None, link=True, empty_decl=True, set_target=True):
 575     """
 576     check that the functions in 'list' are available in 'library'
 577     if they are, then make that library available as a dependency
 578
 579     if the library is not available and mandatory==True, then
 580     raise an error.
 581
 582     If the library is not available and mandatory==False, then
 583     add the library to the list of dependencies to remove from
 584     build rules
 585
 586     optionally check for the functions first in libc
 587     """
 588     remaining = TO_LIST(list)
 589     liblist   = TO_LIST(library)
 590
 591     # check if some already found
 592     for f in remaining[:]:
 593         if CONFIG_SET(conf, 'HAVE_%s' % f.upper()):
 594             remaining.remove(f)
 595
 596     # see if the functions are in libc
 597     if checklibc:
 598         for f in remaining[:]:
 599             if CHECK_FUNC(conf, f, link=True, headers=headers):
 600                 remaining.remove(f)
 601
 602     if remaining == []:
 603         for lib in liblist:
 604             if GET_TARGET_TYPE(conf, lib) != 'SYSLIB' and empty_decl:
 605                 SET_TARGET_TYPE(conf, lib, 'EMPTY')
 606         return True
 607
 608     checklist = conf.CHECK_LIB(liblist, empty_decl=empty_decl, set_target=set_target)
 609     for lib in liblist[:]:
 610         if not lib in checklist and mandatory:
 611             Logs.error("Mandatory library '%s' not found for functions '%s'" % (lib, list))
 612             sys.exit(1)
 613
 614     ret = True
 615     for f in remaining:
 616         if not CHECK_FUNC(conf, f, lib=' '.join(checklist), headers=headers, link=link):
 617             ret = False
 618
 619     return ret
 620
 621
 622 @conf
 623 def IN_LAUNCH_DIR(conf):
 624     '''return True if this rule is being run from the launch directory'''
 625     return os.path.realpath(conf.curdir) == os.path.realpath(Options.launch_dir)
 626 Options.Handler.IN_LAUNCH_DIR = IN_LAUNCH_DIR
 627
 628
 629 @conf
 630 def SAMBA_CONFIG_H(conf, path=None):
 631     '''write out config.h in the right directory'''
 632     # we don't want to produce a config.h in places like lib/replace
 633     # when we are building projects that depend on lib/replace
 634     if not IN_LAUNCH_DIR(conf):
 635         return
 636
 637     if Options.options.debug:
 638         conf.ADD_CFLAGS('-g',
 639                         testflags=True)
 640
 641     if Options.options.developer:
 642         # we add these here to ensure that -Wstrict-prototypes is not set during configure
 643         conf.ADD_CFLAGS('-Wall -g -Wshadow -Werror=strict-prototypes -Wstrict-prototypes -Werror=pointer-arith -Wpointer-arith -Wcast-align -Werror=write-strings -Wwrite-strings -Werror-implicit-function-declaration -Wformat=2 -Wno-format-y2k -Wmissing-prototypes -fno-common -Werror=address -Wdeclaration-after-statement',
 644                         testflags=True)
 645         conf.ADD_CFLAGS('-Wcast-qual', testflags=True)
 646         conf.env.DEVELOPER_MODE = True
 647
 648         # This check is because for ldb_search(), a NULL format string
 649         # is not an error, but some compilers complain about that.
 650         if CHECK_CFLAGS(conf, ["-Werror=format", "-Wformat=2"], '''
 651 int testformat(char *format, ...) __attribute__ ((format (__printf__, 1, 2)));
 652
 653 int main(void) {
 654         testformat(0);
 655         return 0;
 656 }
 657
 658 '''):
 659             if not 'EXTRA_CFLAGS' in conf.env:
 660                 conf.env['EXTRA_CFLAGS'] = []
 661             conf.env['EXTRA_CFLAGS'].extend(TO_LIST("-Werror=format"))
 662
 663     if Options.options.picky_developer:
 664         conf.ADD_CFLAGS('-Werror', testflags=True)
 665
 666     if Options.options.fatal_errors:
 667         conf.ADD_CFLAGS('-Wfatal-errors', testflags=True)
 668
 669     if Options.options.pedantic:
 670         conf.ADD_CFLAGS('-W', testflags=True)
 671
 672     if path is None:
 673         conf.write_config_header('config.h', top=True)
 674     else:
 675         conf.write_config_header(path)
 676     conf.SAMBA_CROSS_CHECK_COMPLETE()
 677
 678
 679 @conf
 680 def CONFIG_PATH(conf, name, default):
 681     '''setup a configurable path'''
 682     if not name in conf.env:
 683         if default[0] == '/':
 684             conf.env[name] = default
 685         else:
 686             conf.env[name] = conf.env['PREFIX'] + default
 687
 688 @conf
 689 def ADD_CFLAGS(conf, flags, testflags=False):
 690     '''add some CFLAGS to the command line
 691        optionally set testflags to ensure all the flags work
 692     '''
 693     if testflags:
 694         ok_flags=[]
 695         for f in flags.split():
 696             if CHECK_CFLAGS(conf, f):
 697                 ok_flags.append(f)
 698         flags = ok_flags
 699     if not 'EXTRA_CFLAGS' in conf.env:
 700         conf.env['EXTRA_CFLAGS'] = []
 701     conf.env['EXTRA_CFLAGS'].extend(TO_LIST(flags))
 702
 703 @conf
 704 def ADD_LDFLAGS(conf, flags, testflags=False):
 705     '''add some LDFLAGS to the command line
 706        optionally set testflags to ensure all the flags work
 707
 708        this will return the flags that are added, if any
 709     '''
 710     if testflags:
 711         ok_flags=[]
 712         for f in flags.split():
 713             if CHECK_LDFLAGS(conf, f):
 714                 ok_flags.append(f)
 715         flags = ok_flags
 716     if not 'EXTRA_LDFLAGS' in conf.env:
 717         conf.env['EXTRA_LDFLAGS'] = []
 718     conf.env['EXTRA_LDFLAGS'].extend(TO_LIST(flags))
 719     return flags
 720
 721
 722 @conf
 723 def ADD_EXTRA_INCLUDES(conf, includes):
 724     '''add some extra include directories to all builds'''
 725     if not 'EXTRA_INCLUDES' in conf.env:
 726         conf.env['EXTRA_INCLUDES'] = []
 727     conf.env['EXTRA_INCLUDES'].extend(TO_LIST(includes))
 728
 729
 730
 731 def CURRENT_CFLAGS(bld, target, cflags, hide_symbols=False):
 732     '''work out the current flags. local flags are added first'''
 733     if not 'EXTRA_CFLAGS' in bld.env:
 734         list = []
 735     else:
 736         list = bld.env['EXTRA_CFLAGS'];
 737     ret = TO_LIST(cflags)
 738     ret.extend(list)
 739     if hide_symbols and bld.env.HAVE_VISIBILITY_ATTR:
 740         ret.append('-fvisibility=hidden')
 741     return ret
 742
 743
 744 @conf
 745 def CHECK_CC_ENV(conf):
 746     """trim whitespaces from 'CC'.
 747     The build farm sometimes puts a space at the start"""
 748     if os.environ.get('CC'):
 749         conf.env.CC = TO_LIST(os.environ.get('CC'))
 750         if len(conf.env.CC) == 1:
 751             # make for nicer logs if just a single command
 752             conf.env.CC = conf.env.CC[0]
 753
 754
 755 @conf
 756 def SETUP_CONFIGURE_CACHE(conf, enable):
 757     '''enable/disable cache of configure results'''
 758     if enable:
 759         # when -C is chosen, we will use a private cache and will
 760         # not look into system includes. This roughtly matches what
 761         # autoconf does with -C
 762         cache_path = os.path.join(conf.blddir, '.confcache')
 763         mkdir_p(cache_path)
 764         Options.cache_global = os.environ['WAFCACHE'] = cache_path
 765     else:
 766         # when -C is not chosen we will not cache configure checks
 767         # We set the recursion limit low to prevent waf from spending
 768         # a lot of time on the signatures of the files.
 769         Options.cache_global = os.environ['WAFCACHE'] = ''
 770         preproc.recursion_limit = 1
 771     # in either case we don't need to scan system includes
 772     preproc.go_absolute = False
 773
 774
 775 @conf
 776 def SAMBA_CHECK_UNDEFINED_SYMBOL_FLAGS(conf):
 777     # we don't want any libraries or modules to rely on runtime
 778     # resolution of symbols
 779     if not sys.platform.startswith("openbsd"):
 780         conf.env.undefined_ldflags = conf.ADD_LDFLAGS('-Wl,-no-undefined', testflags=True)
 781
 782     if not sys.platform.startswith("openbsd") and conf.env.undefined_ignore_ldflags == []:
 783         if conf.CHECK_LDFLAGS(['-undefined', 'dynamic_lookup']):
 784             conf.env.undefined_ignore_ldflags = ['-undefined', 'dynamic_lookup']