wxPython/distutils/command/build_ext.py

   1 """distutils.command.build_ext
   2
   3 Implements the Distutils 'build_ext' command, for building extension
   4 modules (currently limited to C extensions, should accommodate C++
   5 extensions ASAP)."""
   6
   7 # This module should be kept compatible with Python 1.5.2.
   8
   9 __revision__ = "$Id$"
  10
  11 import sys, os, string, re
  12 from types import *
  13 from distutils.core import Command
  14 from distutils.errors import *
  15 from distutils.sysconfig import customize_compiler, get_python_version
  16 from distutils.dep_util import newer_group
  17 from distutils.extension import Extension
  18 from distutils import log
  19
  20 # An extension name is just a dot-separated list of Python NAMEs (ie.
  21 # the same as a fully-qualified module name).
  22 extension_name_re = re.compile \
  23     (r'^[a-zA-Z_][a-zA-Z_0-9]*(\.[a-zA-Z_][a-zA-Z_0-9]*)*$')
  24
  25
  26 def show_compilers ():
  27     from distutils.ccompiler import show_compilers
  28     show_compilers()
  29
  30
  31 class build_ext (Command):
  32
  33     description = "build C/C++ extensions (compile/link to build directory)"
  34
  35     # XXX thoughts on how to deal with complex command-line options like
  36     # these, i.e. how to make it so fancy_getopt can suck them off the
  37     # command line and make it look like setup.py defined the appropriate
  38     # lists of tuples of what-have-you.
  39     #   - each command needs a callback to process its command-line options
  40     #   - Command.__init__() needs access to its share of the whole
  41     #     command line (must ultimately come from
  42     #     Distribution.parse_command_line())
  43     #   - it then calls the current command class' option-parsing
  44     #     callback to deal with weird options like -D, which have to
  45     #     parse the option text and churn out some custom data
  46     #     structure
  47     #   - that data structure (in this case, a list of 2-tuples)
  48     #     will then be present in the command object by the time
  49     #     we get to finalize_options() (i.e. the constructor
  50     #     takes care of both command-line and client options
  51     #     in between initialize_options() and finalize_options())
  52
  53     sep_by = " (separated by '%s')" % os.pathsep
  54     user_options = [
  55         ('build-lib=', 'b',
  56          "directory for compiled extension modules"),
  57         ('build-temp=', 't',
  58          "directory for temporary files (build by-products)"),
  59         ('inplace', 'i',
  60          "ignore build-lib and put compiled extensions into the source " +
  61          "directory alongside your pure Python modules"),
  62         ('include-dirs=', 'I',
  63          "list of directories to search for header files" + sep_by),
  64         ('define=', 'D',
  65          "C preprocessor macros to define"),
  66         ('undef=', 'U',
  67          "C preprocessor macros to undefine"),
  68         ('libraries=', 'l',
  69          "external C libraries to link with"),
  70         ('library-dirs=', 'L',
  71          "directories to search for external C libraries" + sep_by),
  72         ('rpath=', 'R',
  73          "directories to search for shared C libraries at runtime"),
  74         ('link-objects=', 'O',
  75          "extra explicit link objects to include in the link"),
  76         ('debug', 'g',
  77          "compile/link with debugging information"),
  78         ('force', 'f',
  79          "forcibly build everything (ignore file timestamps)"),
  80         ('compiler=', 'c',
  81          "specify the compiler type"),
  82         ('swig-cpp', None,
  83          "make SWIG create C++ files (default is C)"),
  84         ]
  85
  86     boolean_options = ['inplace', 'debug', 'force', 'swig-cpp']
  87
  88     help_options = [
  89         ('help-compiler', None,
  90          "list available compilers", show_compilers),
  91         ]
  92
  93     def initialize_options (self):
  94         self.extensions = None
  95         self.build_lib = None
  96         self.build_temp = None
  97         self.inplace = 0
  98         self.package = None
  99
 100         self.include_dirs = None
 101         self.define = None
 102         self.undef = None
 103         self.libraries = None
 104         self.library_dirs = None
 105         self.rpath = None
 106         self.link_objects = None
 107         self.debug = None
 108         self.force = None
 109         self.compiler = None
 110         self.swig_cpp = None
 111
 112
 113     def finalize_options (self):
 114         from distutils import sysconfig
 115
 116         self.set_undefined_options('build',
 117                                    ('build_lib', 'build_lib'),
 118                                    ('build_temp', 'build_temp'),
 119                                    ('compiler', 'compiler'),
 120                                    ('debug', 'debug'),
 121                                    ('force', 'force'))
 122
 123         if self.package is None:
 124             self.package = self.distribution.ext_package
 125
 126         self.extensions = self.distribution.ext_modules
 127
 128
 129         # Make sure Python's include directories (for Python.h, pyconfig.h,
 130         # etc.) are in the include search path.
 131         py_include = sysconfig.get_python_inc()
 132         plat_py_include = sysconfig.get_python_inc(plat_specific=1)
 133         if self.include_dirs is None:
 134             self.include_dirs = self.distribution.include_dirs or []
 135         if type(self.include_dirs) is StringType:
 136             self.include_dirs = string.split(self.include_dirs, os.pathsep)
 137
 138         # Put the Python "system" include dir at the end, so that
 139         # any local include dirs take precedence.
 140         self.include_dirs.append(py_include)
 141         if plat_py_include != py_include:
 142             self.include_dirs.append(plat_py_include)
 143
 144         if type(self.libraries) is StringType:
 145             self.libraries = [self.libraries]
 146
 147         # Life is easier if we're not forever checking for None, so
 148         # simplify these options to empty lists if unset
 149         if self.libraries is None:
 150             self.libraries = []
 151         if self.library_dirs is None:
 152             self.library_dirs = []
 153         elif type(self.library_dirs) is StringType:
 154             self.library_dirs = string.split(self.library_dirs, os.pathsep)
 155
 156         if self.rpath is None:
 157             self.rpath = []
 158         elif type(self.rpath) is StringType:
 159             self.rpath = string.split(self.rpath, os.pathsep)
 160
 161         # for extensions under windows use different directories
 162         # for Release and Debug builds.
 163         # also Python's library directory must be appended to library_dirs
 164         if os.name == 'nt':
 165             self.library_dirs.append(os.path.join(sys.exec_prefix, 'libs'))
 166             if self.debug:
 167                 self.build_temp = os.path.join(self.build_temp, "Debug")
 168             else:
 169                 self.build_temp = os.path.join(self.build_temp, "Release")
 170
 171             # Append the source distribution include and library directories,
 172             # this allows distutils on windows to work in the source tree
 173             self.include_dirs.append(os.path.join(sys.exec_prefix, 'PC'))
 174             self.library_dirs.append(os.path.join(sys.exec_prefix, 'PCBuild'))
 175
 176         # OS/2 (EMX) doesn't support Debug vs Release builds, but has the
 177         # import libraries in its "Config" subdirectory
 178         if os.name == 'os2':
 179             self.library_dirs.append(os.path.join(sys.exec_prefix, 'Config'))
 180
 181         # for extensions under Cygwin and AtheOS Python's library directory must be
 182         # appended to library_dirs
 183         if sys.platform[:6] == 'cygwin' or sys.platform[:6] == 'atheos':
 184             if string.find(sys.executable, sys.exec_prefix) != -1:
 185                 # building third party extensions
 186                 self.library_dirs.append(os.path.join(sys.prefix, "lib",
 187                                                       "python" + get_python_version(),
 188                                                       "config"))
 189             else:
 190                 # building python standard extensions
 191                 self.library_dirs.append('.')
 192
 193         # The argument parsing will result in self.define being a string, but
 194         # it has to be a list of 2-tuples.  All the preprocessor symbols
 195         # specified by the 'define' option will be set to '1'.  Multiple
 196         # symbols can be separated with commas.
 197
 198         if self.define:
 199             defines = string.split(self.define, ',')
 200             self.define = map(lambda symbol: (symbol, '1'), defines)
 201
 202         # The option for macros to undefine is also a string from the
 203         # option parsing, but has to be a list.  Multiple symbols can also
 204         # be separated with commas here.
 205         if self.undef:
 206             self.undef = string.split(self.undef, ',')
 207
 208     # finalize_options ()
 209
 210
 211     def run (self):
 212
 213         from distutils.ccompiler import new_compiler
 214
 215         # 'self.extensions', as supplied by setup.py, is a list of
 216         # Extension instances.  See the documentation for Extension (in
 217         # distutils.extension) for details.
 218         #
 219         # For backwards compatibility with Distutils 0.8.2 and earlier, we
 220         # also allow the 'extensions' list to be a list of tuples:
 221         #    (ext_name, build_info)
 222         # where build_info is a dictionary containing everything that
 223         # Extension instances do except the name, with a few things being
 224         # differently named.  We convert these 2-tuples to Extension
 225         # instances as needed.
 226
 227         if not self.extensions:
 228             return
 229
 230         # If we were asked to build any C/C++ libraries, make sure that the
 231         # directory where we put them is in the library search path for
 232         # linking extensions.
 233         if self.distribution.has_c_libraries():
 234             build_clib = self.get_finalized_command('build_clib')
 235             self.libraries.extend(build_clib.get_library_names() or [])
 236             self.library_dirs.append(build_clib.build_clib)
 237
 238         # Setup the CCompiler object that we'll use to do all the
 239         # compiling and linking
 240         self.compiler = new_compiler(compiler=self.compiler,
 241                                      verbose=self.verbose,
 242                                      dry_run=self.dry_run,
 243                                      force=self.force)
 244         customize_compiler(self.compiler)
 245
 246         # And make sure that any compile/link-related options (which might
 247         # come from the command-line or from the setup script) are set in
 248         # that CCompiler object -- that way, they automatically apply to
 249         # all compiling and linking done here.
 250         if self.include_dirs is not None:
 251             self.compiler.set_include_dirs(self.include_dirs)
 252         if self.define is not None:
 253             # 'define' option is a list of (name,value) tuples
 254             for (name,value) in self.define:
 255                 self.compiler.define_macro(name, value)
 256         if self.undef is not None:
 257             for macro in self.undef:
 258                 self.compiler.undefine_macro(macro)
 259         if self.libraries is not None:
 260             self.compiler.set_libraries(self.libraries)
 261         if self.library_dirs is not None:
 262             self.compiler.set_library_dirs(self.library_dirs)
 263         if self.rpath is not None:
 264             self.compiler.set_runtime_library_dirs(self.rpath)
 265         if self.link_objects is not None:
 266             self.compiler.set_link_objects(self.link_objects)
 267
 268         # Now actually compile and link everything.
 269         self.build_extensions()
 270
 271     # run ()
 272
 273
 274     def check_extensions_list (self, extensions):
 275         """Ensure that the list of extensions (presumably provided as a
 276         command option 'extensions') is valid, i.e. it is a list of
 277         Extension objects.  We also support the old-style list of 2-tuples,
 278         where the tuples are (ext_name, build_info), which are converted to
 279         Extension instances here.
 280
 281         Raise DistutilsSetupError if the structure is invalid anywhere;
 282         just returns otherwise.
 283         """
 284         if type(extensions) is not ListType:
 285             raise DistutilsSetupError, \
 286                   "'ext_modules' option must be a list of Extension instances"
 287
 288         for i in range(len(extensions)):
 289             ext = extensions[i]
 290             if isinstance(ext, Extension):
 291                 continue                # OK! (assume type-checking done
 292                                         # by Extension constructor)
 293
 294             (ext_name, build_info) = ext
 295             log.warn(("old-style (ext_name, build_info) tuple found in "
 296                       "ext_modules for extension '%s'"
 297                       "-- please convert to Extension instance" % ext_name))
 298             if type(ext) is not TupleType and len(ext) != 2:
 299                 raise DistutilsSetupError, \
 300                       ("each element of 'ext_modules' option must be an "
 301                        "Extension instance or 2-tuple")
 302
 303             if not (type(ext_name) is StringType and
 304                     extension_name_re.match(ext_name)):
 305                 raise DistutilsSetupError, \
 306                       ("first element of each tuple in 'ext_modules' "
 307                        "must be the extension name (a string)")
 308
 309             if type(build_info) is not DictionaryType:
 310                 raise DistutilsSetupError, \
 311                       ("second element of each tuple in 'ext_modules' "
 312                        "must be a dictionary (build info)")
 313
 314             # OK, the (ext_name, build_info) dict is type-safe: convert it
 315             # to an Extension instance.
 316             ext = Extension(ext_name, build_info['sources'])
 317
 318             # Easy stuff: one-to-one mapping from dict elements to
 319             # instance attributes.
 320             for key in ('include_dirs',
 321                         'library_dirs',
 322                         'libraries',
 323                         'extra_objects',
 324                         'extra_compile_args',
 325                         'extra_link_args'):
 326                 val = build_info.get(key)
 327                 if val is not None:
 328                     setattr(ext, key, val)
 329
 330             # Medium-easy stuff: same syntax/semantics, different names.
 331             ext.runtime_library_dirs = build_info.get('rpath')
 332             if build_info.has_key('def_file'):
 333                 log.warn("'def_file' element of build info dict "
 334                          "no longer supported")
 335
 336             # Non-trivial stuff: 'macros' split into 'define_macros'
 337             # and 'undef_macros'.
 338             macros = build_info.get('macros')
 339             if macros:
 340                 ext.define_macros = []
 341                 ext.undef_macros = []
 342                 for macro in macros:
 343                     if not (type(macro) is TupleType and
 344                             1 <= len(macro) <= 2):
 345                         raise DistutilsSetupError, \
 346                               ("'macros' element of build info dict "
 347                                "must be 1- or 2-tuple")
 348                     if len(macro) == 1:
 349                         ext.undef_macros.append(macro[0])
 350                     elif len(macro) == 2:
 351                         ext.define_macros.append(macro)
 352
 353             extensions[i] = ext
 354
 355         # for extensions
 356
 357     # check_extensions_list ()
 358
 359
 360     def get_source_files (self):
 361         self.check_extensions_list(self.extensions)
 362         filenames = []
 363
 364         # Wouldn't it be neat if we knew the names of header files too...
 365         for ext in self.extensions:
 366             filenames.extend(ext.sources)
 367
 368         return filenames
 369
 370
 371     def get_outputs (self):
 372
 373         # Sanity check the 'extensions' list -- can't assume this is being
 374         # done in the same run as a 'build_extensions()' call (in fact, we
 375         # can probably assume that it *isn't*!).
 376         self.check_extensions_list(self.extensions)
 377
 378         # And build the list of output (built) filenames.  Note that this
 379         # ignores the 'inplace' flag, and assumes everything goes in the
 380         # "build" tree.
 381         outputs = []
 382         for ext in self.extensions:
 383             fullname = self.get_ext_fullname(ext.name)
 384             outputs.append(os.path.join(self.build_lib,
 385                                         self.get_ext_filename(fullname)))
 386         return outputs
 387
 388     # get_outputs ()
 389
 390     def build_extensions(self):
 391         # First, sanity-check the 'extensions' list
 392         self.check_extensions_list(self.extensions)
 393
 394         for ext in self.extensions:
 395             self.build_extension(ext)
 396
 397     def build_extension(self, ext):
 398         sources = ext.sources
 399         if sources is None or type(sources) not in (ListType, TupleType):
 400             raise DistutilsSetupError, \
 401                   ("in 'ext_modules' option (extension '%s'), " +
 402                    "'sources' must be present and must be " +
 403                    "a list of source filenames") % ext.name
 404         sources = list(sources)
 405
 406         fullname = self.get_ext_fullname(ext.name)
 407         if self.inplace:
 408             # ignore build-lib -- put the compiled extension into
 409             # the source tree along with pure Python modules
 410
 411             modpath = string.split(fullname, '.')
 412             package = string.join(modpath[0:-1], '.')
 413             base = modpath[-1]
 414
 415             build_py = self.get_finalized_command('build_py')
 416             package_dir = build_py.get_package_dir(package)
 417             ext_filename = os.path.join(package_dir,
 418                                         self.get_ext_filename(base))
 419         else:
 420             ext_filename = os.path.join(self.build_lib,
 421                                         self.get_ext_filename(fullname))
 422         depends = sources + ext.depends
 423         if not (self.force or newer_group(depends, ext_filename, 'newer')):
 424             log.debug("skipping '%s' extension (up-to-date)", ext.name)
 425             return
 426         else:
 427             log.info("building '%s' extension", ext.name)
 428
 429         # First, scan the sources for SWIG definition files (.i), run
 430         # SWIG on 'em to create .c files, and modify the sources list
 431         # accordingly.
 432         sources = self.swig_sources(sources)
 433
 434         # Next, compile the source code to object files.
 435
 436         # XXX not honouring 'define_macros' or 'undef_macros' -- the
 437         # CCompiler API needs to change to accommodate this, and I
 438         # want to do one thing at a time!
 439
 440         # Two possible sources for extra compiler arguments:
 441         #   - 'extra_compile_args' in Extension object
 442         #   - CFLAGS environment variable (not particularly
 443         #     elegant, but people seem to expect it and I
 444         #     guess it's useful)
 445         # The environment variable should take precedence, and
 446         # any sensible compiler will give precedence to later
 447         # command line args.  Hence we combine them in order:
 448         extra_args = ext.extra_compile_args or []
 449
 450         macros = ext.define_macros[:]
 451         for undef in ext.undef_macros:
 452             macros.append((undef,))
 453
 454         objects = self.compiler.compile(sources,
 455                                         output_dir=self.build_temp,
 456                                         macros=macros,
 457                                         include_dirs=ext.include_dirs,
 458                                         debug=self.debug,
 459                                         extra_postargs=extra_args,
 460                                         depends=ext.depends)
 461
 462         # XXX -- this is a Vile HACK!
 463         #
 464         # The setup.py script for Python on Unix needs to be able to
 465         # get this list so it can perform all the clean up needed to
 466         # avoid keeping object files around when cleaning out a failed
 467         # build of an extension module.  Since Distutils does not
 468         # track dependencies, we have to get rid of intermediates to
 469         # ensure all the intermediates will be properly re-built.
 470         #
 471         self._built_objects = objects[:]
 472
 473         # Now link the object files together into a "shared object" --
 474         # of course, first we have to figure out all the other things
 475         # that go into the mix.
 476         if ext.extra_objects:
 477             objects.extend(ext.extra_objects)
 478         extra_args = ext.extra_link_args or []
 479
 480         # Detect target language, if not provided
 481         language = ext.language or self.compiler.detect_language(sources)
 482
 483         self.compiler.link_shared_object(
 484             objects, ext_filename,
 485             libraries=self.get_libraries(ext),
 486             library_dirs=ext.library_dirs,
 487             runtime_library_dirs=ext.runtime_library_dirs,
 488             extra_postargs=extra_args,
 489             export_symbols=self.get_export_symbols(ext),
 490             debug=self.debug,
 491             build_temp=self.build_temp,
 492             target_lang=language)
 493
 494
 495     def swig_sources (self, sources):
 496
 497         """Walk the list of source files in 'sources', looking for SWIG
 498         interface (.i) files.  Run SWIG on all that are found, and
 499         return a modified 'sources' list with SWIG source files replaced
 500         by the generated C (or C++) files.
 501         """
 502
 503         new_sources = []
 504         swig_sources = []
 505         swig_targets = {}
 506
 507         # XXX this drops generated C/C++ files into the source tree, which
 508         # is fine for developers who want to distribute the generated
 509         # source -- but there should be an option to put SWIG output in
 510         # the temp dir.
 511
 512         if self.swig_cpp:
 513             target_ext = '.cpp'
 514         else:
 515             target_ext = '.c'
 516
 517         for source in sources:
 518             (base, ext) = os.path.splitext(source)
 519             if ext == ".i":             # SWIG interface file
 520                 new_sources.append(base + '_wrap' + target_ext)
 521                 swig_sources.append(source)
 522                 swig_targets[source] = new_sources[-1]
 523             else:
 524                 new_sources.append(source)
 525
 526         if not swig_sources:
 527             return new_sources
 528
 529         swig = self.find_swig()
 530         swig_cmd = [swig, "-python"]
 531         if self.swig_cpp:
 532             swig_cmd.append("-c++")
 533
 534         for source in swig_sources:
 535             target = swig_targets[source]
 536             log.info("swigging %s to %s", source, target)
 537             self.spawn(swig_cmd + ["-o", target, source])
 538
 539         return new_sources
 540
 541     # swig_sources ()
 542
 543     def find_swig (self):
 544         """Return the name of the SWIG executable.  On Unix, this is
 545         just "swig" -- it should be in the PATH.  Tries a bit harder on
 546         Windows.
 547         """
 548
 549         if os.name == "posix":
 550             return "swig"
 551         elif os.name == "nt":
 552
 553             # Look for SWIG in its standard installation directory on
 554             # Windows (or so I presume!).  If we find it there, great;
 555             # if not, act like Unix and assume it's in the PATH.
 556             for vers in ("1.3", "1.2", "1.1"):
 557                 fn = os.path.join("c:\\swig%s" % vers, "swig.exe")
 558                 if os.path.isfile(fn):
 559                     return fn
 560             else:
 561                 return "swig.exe"
 562
 563         elif os.name == "os2":
 564             # assume swig available in the PATH.
 565             return "swig.exe"
 566
 567         else:
 568             raise DistutilsPlatformError, \
 569                   ("I don't know how to find (much less run) SWIG "
 570                    "on platform '%s'") % os.name
 571
 572     # find_swig ()
 573
 574     # -- Name generators -----------------------------------------------
 575     # (extension names, filenames, whatever)
 576
 577     def get_ext_fullname (self, ext_name):
 578         if self.package is None:
 579             return ext_name
 580         else:
 581             return self.package + '.' + ext_name
 582
 583     def get_ext_filename (self, ext_name):
 584         r"""Convert the name of an extension (eg. "foo.bar") into the name
 585         of the file from which it will be loaded (eg. "foo/bar.so", or
 586         "foo\bar.pyd").
 587         """
 588
 589         from distutils.sysconfig import get_config_var
 590         ext_path = string.split(ext_name, '.')
 591         # OS/2 has an 8 character module (extension) limit :-(
 592         if os.name == "os2":
 593             ext_path[len(ext_path) - 1] = ext_path[len(ext_path) - 1][:8]
 594         # extensions in debug_mode are named 'module_d.pyd' under windows
 595         so_ext = get_config_var('SO')
 596         if os.name == 'nt' and self.debug:
 597             return apply(os.path.join, ext_path) + '_d' + so_ext
 598         return apply(os.path.join, ext_path) + so_ext
 599
 600     def get_export_symbols (self, ext):
 601         """Return the list of symbols that a shared extension has to
 602         export.  This either uses 'ext.export_symbols' or, if it's not
 603         provided, "init" + module_name.  Only relevant on Windows, where
 604         the .pyd file (DLL) must export the module "init" function.
 605         """
 606
 607         initfunc_name = "init" + string.split(ext.name,'.')[-1]
 608         if initfunc_name not in ext.export_symbols:
 609             ext.export_symbols.append(initfunc_name)
 610         return ext.export_symbols
 611
 612     def get_libraries (self, ext):
 613         """Return the list of libraries to link against when building a
 614         shared extension.  On most platforms, this is just 'ext.libraries';
 615         on Windows and OS/2, we add the Python library (eg. python20.dll).
 616         """
 617         # The python library is always needed on Windows.  For MSVC, this
 618         # is redundant, since the library is mentioned in a pragma in
 619         # pyconfig.h that MSVC groks.  The other Windows compilers all seem
 620         # to need it mentioned explicitly, though, so that's what we do.
 621         # Append '_d' to the python import library on debug builds.
 622         if sys.platform == "win32":
 623             from distutils.msvccompiler import MSVCCompiler
 624             if not isinstance(self.compiler, MSVCCompiler):
 625                 template = "python%d%d"
 626                 if self.debug:
 627                     template = template + '_d'
 628                 pythonlib = (template %
 629                        (sys.hexversion >> 24, (sys.hexversion >> 16) & 0xff))
 630                 # don't extend ext.libraries, it may be shared with other
 631                 # extensions, it is a reference to the original list
 632                 return ext.libraries + [pythonlib]
 633             else:
 634                 return ext.libraries
 635         elif sys.platform == "os2emx":
 636             # EMX/GCC requires the python library explicitly, and I
 637             # believe VACPP does as well (though not confirmed) - AIM Apr01
 638             template = "python%d%d"
 639             # debug versions of the main DLL aren't supported, at least
 640             # not at this time - AIM Apr01
 641             #if self.debug:
 642             #    template = template + '_d'
 643             pythonlib = (template %
 644                    (sys.hexversion >> 24, (sys.hexversion >> 16) & 0xff))
 645             # don't extend ext.libraries, it may be shared with other
 646             # extensions, it is a reference to the original list
 647             return ext.libraries + [pythonlib]
 648         elif sys.platform[:6] == "cygwin":
 649             template = "python%d.%d"
 650             pythonlib = (template %
 651                    (sys.hexversion >> 24, (sys.hexversion >> 16) & 0xff))
 652             # don't extend ext.libraries, it may be shared with other
 653             # extensions, it is a reference to the original list
 654             return ext.libraries + [pythonlib]
 655         elif sys.platform[:6] == "atheos":
 656             from distutils import sysconfig
 657
 658             template = "python%d.%d"
 659             pythonlib = (template %
 660                    (sys.hexversion >> 24, (sys.hexversion >> 16) & 0xff))
 661             # Get SHLIBS from Makefile
 662             extra = []
 663             for lib in sysconfig.get_config_var('SHLIBS').split():
 664                 if lib.startswith('-l'):
 665                     extra.append(lib[2:])
 666                 else:
 667                     extra.append(lib)
 668             # don't extend ext.libraries, it may be shared with other
 669             # extensions, it is a reference to the original list
 670             return ext.libraries + [pythonlib, "m"] + extra
 671         else:
 672             return ext.libraries
 673
 674 # class build_ext