1 """Provide access to Python's configuration information. The specific
2 configuration variables available depend heavily on the platform and
3 configuration. The values may be retrieved using
4 get_config_var(name), and the list of variables is available via
5 get_config_vars().keys(). Additional convenience functions are also
8 Written by: Fred L. Drake, Jr.
9 Email: <fdrake@acm.org>
12 __revision__ = "$Id: sysconfig.py 52234 2006-10-08 17:50:26Z ronald.oussoren $"
19 from distutils.errors import DistutilsPlatformError
21 # These are needed in a couple of spots, so just compute them once.
22 PREFIX = os.path.normpath(sys.prefix)
23 EXEC_PREFIX = os.path.normpath(sys.exec_prefix)
25 # python_build: (Boolean) if true, we're either building Python or
26 # building an extension with an un-installed Python, so we use
27 # different (hard-wired) directories.
29 argv0_path = os.path.dirname(os.path.abspath(sys.executable))
30 landmark = os.path.join(argv0_path, "Modules", "Setup")
32 python_build = os.path.isfile(landmark)
37 def get_python_version():
38 """Return a string containing the major and minor Python version,
39 leaving off the patchlevel. Sample return values could be '1.5'
42 return sys.version[:3]
45 def get_python_inc(plat_specific=0, prefix=None):
46 """Return the directory containing installed Python header files.
48 If 'plat_specific' is false (the default), this is the path to the
49 non-platform-specific header files, i.e. Python.h and so on;
50 otherwise, this is the path to platform-specific header files
53 If 'prefix' is supplied, use it instead of sys.prefix or
54 sys.exec_prefix -- i.e., ignore 'plat_specific'.
57 prefix = plat_specific and EXEC_PREFIX or PREFIX
58 if os.name == "posix":
60 base = os.path.dirname(os.path.abspath(sys.executable))
64 inc_dir = os.path.join(base, "Include")
65 if not os.path.exists(inc_dir):
66 inc_dir = os.path.join(os.path.dirname(base), "Include")
68 # return os.path.join(prefix, "include", "python" + get_python_version())
69 return os.path.join(prefix, "include", "python")
71 return os.path.join(prefix, "include")
72 elif os.name == "mac":
74 return os.path.join(prefix, "Mac", "Include")
76 return os.path.join(prefix, "Include")
77 elif os.name == "os2":
78 return os.path.join(prefix, "Include")
80 raise DistutilsPlatformError(
81 "I don't know where Python installs its C header files "
82 "on platform '%s'" % os.name)
85 def get_python_lib(plat_specific=0, standard_lib=0, prefix=None):
86 """Return the directory containing the Python library (standard or
89 If 'plat_specific' is true, return the directory containing
90 platform-specific modules, i.e. any module from a non-pure-Python
91 module distribution; otherwise, return the platform-shared library
92 directory. If 'standard_lib' is true, return the directory
93 containing standard Python library modules; otherwise, return the
94 directory for site-specific modules.
96 If 'prefix' is supplied, use it instead of sys.prefix or
97 sys.exec_prefix -- i.e., ignore 'plat_specific'.
100 prefix = plat_specific and EXEC_PREFIX or PREFIX
102 if os.name == "posix":
103 # libpython = os.path.join(prefix,
104 # "lib", "python" + get_python_version())
109 return os.path.join(libpython, "site-packages")
111 elif os.name == "nt":
113 return os.path.join(prefix, "Lib")
115 if get_python_version() < "2.2":
118 return os.path.join(PREFIX, "Lib", "site-packages")
120 elif os.name == "mac":
123 return os.path.join(prefix, "Lib", "lib-dynload")
125 return os.path.join(prefix, "Lib", "site-packages")
128 return os.path.join(prefix, "Lib")
130 return os.path.join(prefix, "Lib", "site-packages")
132 elif os.name == "os2":
134 return os.path.join(PREFIX, "Lib")
136 return os.path.join(PREFIX, "Lib", "site-packages")
139 raise DistutilsPlatformError(
140 "I don't know where Python installs its library "
141 "on platform '%s'" % os.name)
144 def customize_compiler(compiler):
145 """Do any platform-specific customization of a CCompiler instance.
147 Mainly needed on Unix, so we can plug in the information that
148 varies across Unices and is stored in Python's Makefile.
150 if compiler.compiler_type == "unix":
151 (cc, cxx, opt, cflags, ccshared, ldshared, so_ext) = \
152 get_config_vars('CC', 'CXX', 'OPT', 'CFLAGS',
153 'CCSHARED', 'LDSHARED', 'SO')
155 if os.environ.has_key('CC'):
156 cc = os.environ['CC']
157 if os.environ.has_key('CXX'):
158 cxx = os.environ['CXX']
159 if os.environ.has_key('LDSHARED'):
160 ldshared = os.environ['LDSHARED']
161 if os.environ.has_key('CPP'):
162 cpp = os.environ['CPP']
164 cpp = cc + " -E" # not always
165 if os.environ.has_key('LDFLAGS'):
166 ldshared = ldshared + ' ' + os.environ['LDFLAGS']
167 if os.environ.has_key('CFLAGS'):
168 cflags = opt + ' ' + os.environ['CFLAGS']
169 ldshared = ldshared + ' ' + os.environ['CFLAGS']
170 if os.environ.has_key('CPPFLAGS'):
171 cpp = cpp + ' ' + os.environ['CPPFLAGS']
172 cflags = cflags + ' ' + os.environ['CPPFLAGS']
173 ldshared = ldshared + ' ' + os.environ['CPPFLAGS']
175 cc_cmd = cc + ' ' + cflags
176 compiler.set_executables(
179 compiler_so=cc_cmd + ' ' + ccshared,
184 compiler.shared_lib_extension = so_ext
187 def get_config_h_filename():
188 """Return full pathname of installed pyconfig.h file."""
192 inc_dir = get_python_inc(plat_specific=1)
193 if get_python_version() < '2.2':
194 config_h = 'config.h'
196 # The name of the config.h file changed in 2.2
197 config_h = 'pyconfig.h'
198 return os.path.join(inc_dir, config_h)
201 def get_makefile_filename():
202 """Return full pathname of installed Makefile from the Python build."""
204 return os.path.join(os.path.dirname(sys.executable), "Makefile")
205 lib_dir = get_python_lib(plat_specific=1, standard_lib=1)
206 return os.path.join(lib_dir, "config", "Makefile")
209 def parse_config_h(fp, g=None):
210 """Parse a config.h-style file.
212 A dictionary containing name/value pairs is returned. If an
213 optional dictionary is passed in as the second argument, it is
214 used instead of a new dictionary.
218 define_rx = re.compile("#define ([A-Z][A-Za-z0-9_]+) (.*)\n")
219 undef_rx = re.compile("/[*] #undef ([A-Z][A-Za-z0-9_]+) [*]/\n")
225 m = define_rx.match(line)
229 except ValueError: pass
232 m = undef_rx.match(line)
238 # Regexes needed for parsing Makefile (and similar syntaxes,
239 # like old-style Setup files).
240 _variable_rx = re.compile("([a-zA-Z][a-zA-Z0-9_]+)\s*=\s*(.*)")
241 _findvar1_rx = re.compile(r"\$\(([A-Za-z][A-Za-z0-9_]*)\)")
242 _findvar2_rx = re.compile(r"\${([A-Za-z][A-Za-z0-9_]*)}")
244 def parse_makefile(fn, g=None):
245 """Parse a Makefile-style file.
247 A dictionary containing name/value pairs is returned. If an
248 optional dictionary is passed in as the second argument, it is
249 used instead of a new dictionary.
251 from distutils.text_file import TextFile
252 fp = TextFile(fn, strip_comments=1, skip_blanks=1, join_lines=1)
261 if line is None: # eof
263 m = _variable_rx.match(line)
271 except ValueError: pass
274 # do variable interpolation here
276 for name in notdone.keys():
277 value = notdone[name]
278 m = _findvar1_rx.search(value) or _findvar2_rx.search(value)
284 elif notdone.has_key(n):
285 # get it on a subsequent round
287 elif os.environ.has_key(n):
288 # do it like make: fall back to environment
293 after = value[m.end():]
294 value = value[:m.start()] + item + after
296 notdone[name] = value
298 try: value = int(value)
300 done[name] = string.strip(value)
305 # bogus variable reference; just drop it since we can't deal
310 # save the results in the global dictionary
315 def expand_makefile_vars(s, vars):
316 """Expand Makefile-style variables -- "${foo}" or "$(foo)" -- in
317 'string' according to 'vars' (a dictionary mapping variable names to
318 values). Variables not present in 'vars' are silently expanded to the
319 empty string. The variable values in 'vars' should not contain further
320 variable expansions; if 'vars' is the output of 'parse_makefile()',
321 you're fine. Returns a variable-expanded version of 's'.
324 # This algorithm does multiple expansion, so if vars['foo'] contains
325 # "${bar}", it will expand ${foo} to ${bar}, and then expand
326 # ${bar}... and so forth. This is fine as long as 'vars' comes from
327 # 'parse_makefile()', which takes care of such expansions eagerly,
328 # according to make's variable expansion semantics.
331 m = _findvar1_rx.search(s) or _findvar2_rx.search(s)
333 (beg, end) = m.span()
334 s = s[0:beg] + vars.get(m.group(1)) + s[end:]
343 """Initialize the module as appropriate for POSIX systems."""
345 # load the installed Makefile:
347 filename = get_makefile_filename()
348 parse_makefile(filename, g)
350 my_msg = "invalid Python installation: unable to open %s" % filename
351 if hasattr(msg, "strerror"):
352 my_msg = my_msg + " (%s)" % msg.strerror
354 raise DistutilsPlatformError(my_msg)
356 # load the installed pyconfig.h:
358 # filename = get_config_h_filename()
359 filename = "/sys/src/cmd/python/pyconfig.h"
360 parse_config_h(file(filename), g)
362 my_msg = "invalid Python installation: unable to open %s" % filename
363 if hasattr(msg, "strerror"):
364 my_msg = my_msg + " (%s)" % msg.strerror
366 raise DistutilsPlatformError(my_msg)
368 # On MacOSX we need to check the setting of the environment variable
369 # MACOSX_DEPLOYMENT_TARGET: configure bases some choices on it so
370 # it needs to be compatible.
371 # If it isn't set we set it to the configure-time value
372 if sys.platform == 'darwin' and g.has_key('MACOSX_DEPLOYMENT_TARGET'):
373 cfg_target = g['MACOSX_DEPLOYMENT_TARGET']
374 cur_target = os.getenv('MACOSX_DEPLOYMENT_TARGET', '')
376 cur_target = cfg_target
377 os.putenv('MACOSX_DEPLOYMENT_TARGET', cfg_target)
378 elif map(int, cfg_target.split('.')) > map(int, cur_target.split('.')):
379 my_msg = ('$MACOSX_DEPLOYMENT_TARGET mismatch: now "%s" but "%s" during configure'
380 % (cur_target, cfg_target))
381 raise DistutilsPlatformError(my_msg)
383 # On AIX, there are wrong paths to the linker scripts in the Makefile
384 # -- these paths are relative to the Python source, but when installed
385 # the scripts are in another directory.
387 g['LDSHARED'] = g['BLDSHARED']
389 elif get_python_version() < '2.1':
390 # The following two branches are for 1.5.2 compatibility.
391 if sys.platform == 'aix4': # what about AIX 3.x ?
392 # Linker script is in the config directory, not in Modules as the
394 python_lib = get_python_lib(standard_lib=1)
395 ld_so_aix = os.path.join(python_lib, 'config', 'ld_so_aix')
396 python_exp = os.path.join(python_lib, 'config', 'python.exp')
398 g['LDSHARED'] = "%s %s -bI:%s" % (ld_so_aix, g['CC'], python_exp)
400 elif sys.platform == 'beos':
401 # Linker script is in the config directory. In the Makefile it is
402 # relative to the srcdir, which after installation no longer makes
404 python_lib = get_python_lib(standard_lib=1)
405 linkerscript_path = string.split(g['LDSHARED'])[0]
406 linkerscript_name = os.path.basename(linkerscript_path)
407 linkerscript = os.path.join(python_lib, 'config',
410 # XXX this isn't the right place to do this: adding the Python
411 # library to the link, if needed, should be in the "build_ext"
412 # command. (It's also needed for non-MS compilers on Windows, and
413 # it's taken care of for them by the 'build_ext.get_libraries()'
415 g['LDSHARED'] = ("%s -L%s/lib -lpython%s" %
416 (linkerscript, PREFIX, get_python_version()))
423 """Initialize the module as appropriate for NT"""
425 # set basic install directories
426 g['LIBDEST'] = get_python_lib(plat_specific=0, standard_lib=1)
427 g['BINLIBDEST'] = get_python_lib(plat_specific=1, standard_lib=1)
429 # XXX hmmm.. a normal install puts include files here
430 g['INCLUDEPY'] = get_python_inc(plat_specific=0)
440 """Initialize the module as appropriate for Macintosh systems"""
442 # set basic install directories
443 g['LIBDEST'] = get_python_lib(plat_specific=0, standard_lib=1)
444 g['BINLIBDEST'] = get_python_lib(plat_specific=1, standard_lib=1)
446 # XXX hmmm.. a normal install puts include files here
447 g['INCLUDEPY'] = get_python_inc(plat_specific=0)
450 if not hasattr(MacOS, 'runtimemodel'):
453 g['SO'] = '.%s.slb' % MacOS.runtimemodel
455 # XXX are these used anywhere?
456 g['install_lib'] = os.path.join(EXEC_PREFIX, "Lib")
457 g['install_platlib'] = os.path.join(EXEC_PREFIX, "Mac", "Lib")
459 # These are used by the extension module build
466 """Initialize the module as appropriate for OS/2"""
468 # set basic install directories
469 g['LIBDEST'] = get_python_lib(plat_specific=0, standard_lib=1)
470 g['BINLIBDEST'] = get_python_lib(plat_specific=1, standard_lib=1)
472 # XXX hmmm.. a normal install puts include files here
473 g['INCLUDEPY'] = get_python_inc(plat_specific=0)
482 def get_config_vars(*args):
483 """With no arguments, return a dictionary of all configuration
484 variables relevant for the current platform. Generally this includes
485 everything needed to build extensions and install both pure modules and
486 extensions. On Unix, this means every variable defined in Python's
487 installed Makefile; on Windows and Mac OS it's a much smaller set.
489 With arguments, return a list of values that result from looking up
490 each argument in the configuration variable dictionary.
493 if _config_vars is None:
494 func = globals().get("_init_" + os.name)
500 # Normalized versions of prefix and exec_prefix are handy to have;
501 # in fact, these are the standard versions used most places in the
503 _config_vars['prefix'] = PREFIX
504 _config_vars['exec_prefix'] = EXEC_PREFIX
506 if sys.platform == 'darwin':
507 kernel_version = os.uname()[2] # Kernel version (8.4.3)
508 major_version = int(kernel_version.split('.')[0])
510 if major_version < 8:
511 # On Mac OS X before 10.4, check if -arch and -isysroot
512 # are in CFLAGS or LDFLAGS and remove them if they are.
513 # This is needed when building extensions on a 10.3 system
514 # using a universal build of python.
515 for key in ('LDFLAGS', 'BASECFLAGS',
516 # a number of derived variables. These need to be
517 # patched up as well.
518 'CFLAGS', 'PY_CFLAGS', 'BLDSHARED'):
520 flags = _config_vars[key]
521 flags = re.sub('-arch\s+\w+\s', ' ', flags)
522 flags = re.sub('-isysroot [^ \t]*', ' ', flags)
523 _config_vars[key] = flags
528 vals.append(_config_vars.get(name))
533 def get_config_var(name):
534 """Return the value of a single variable using the dictionary
535 returned by 'get_config_vars()'. Equivalent to
536 get_config_vars().get(name)
538 return get_config_vars().get(name)