cpython/Lib/distutils/sysconfig.py

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"""Provide access to Python's configuration information. The specific
configuration variables available depend heavily on the platform and
configuration. The values may be retrieved using
get_config_var(name), and the list of variables is available via
get_config_vars().keys(). Additional convenience functions are also
available.
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Written by: Fred L. Drake, Jr.
Email: <fdrake@acm.org>
Initial date: 17-Dec-1998
"""
__revision__ = "$Id$"
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import os
import re
import string
import sys
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from errors import DistutilsPlatformError
# These are needed in a couple of spots, so just compute them once.
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PREFIX = os.path.normpath(sys.prefix)
EXEC_PREFIX = os.path.normpath(sys.exec_prefix)
# Boolean; if it's true, we're still building Python, so
# we use different (hard-wired) directories.
python_build = 0
def set_python_build():
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"""Set the python_build flag to true.
This means that we're building Python itself. Only called from
the setup.py script shipped with Python.
"""
global python_build
python_build = 1
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def get_python_inc(plat_specific=0, prefix=None):
"""Return the directory containing installed Python header files.
If 'plat_specific' is false (the default), this is the path to the
non-platform-specific header files, i.e. Python.h and so on;
otherwise, this is the path to platform-specific header files
(namely pyconfig.h).
If 'prefix' is supplied, use it instead of sys.prefix or
sys.exec_prefix -- i.e., ignore 'plat_specific'.
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"""
if prefix is None:
prefix = plat_specific and EXEC_PREFIX or PREFIX
if os.name == "posix":
if python_build:
return "Include/"
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return os.path.join(prefix, "include", "python" + sys.version[:3])
elif os.name == "nt":
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return os.path.join(prefix, "include")
elif os.name == "mac":
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return os.path.join(prefix, "Include")
elif os.name == "os2":
return os.path.join(prefix, "Include")
else:
raise DistutilsPlatformError(
"I don't know where Python installs its C header files "
"on platform '%s'" % os.name)
def get_python_lib(plat_specific=0, standard_lib=0, prefix=None):
"""Return the directory containing the Python library (standard or
site additions).
If 'plat_specific' is true, return the directory containing
platform-specific modules, i.e. any module from a non-pure-Python
module distribution; otherwise, return the platform-shared library
directory. If 'standard_lib' is true, return the directory
containing standard Python library modules; otherwise, return the
directory for site-specific modules.
If 'prefix' is supplied, use it instead of sys.prefix or
sys.exec_prefix -- i.e., ignore 'plat_specific'.
"""
if prefix is None:
prefix = plat_specific and EXEC_PREFIX or PREFIX
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if os.name == "posix":
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libpython = os.path.join(prefix,
"lib", "python" + sys.version[:3])
if standard_lib:
return libpython
else:
return os.path.join(libpython, "site-packages")
elif os.name == "nt":
if standard_lib:
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return os.path.join(prefix, "Lib")
else:
if sys.version < "2.2":
return prefix
else:
return os.path.join(PREFIX, "Lib", "site-packages")
elif os.name == "mac":
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if plat_specific:
if standard_lib:
return os.path.join(prefix, "Lib", "lib-dynload")
else:
return os.path.join(prefix, "Lib", "site-packages")
else:
if standard_lib:
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return os.path.join(prefix, "Lib")
else:
return os.path.join(prefix, "Lib", "site-packages")
elif os.name == "os2":
if standard_lib:
return os.path.join(PREFIX, "Lib")
else:
return os.path.join(PREFIX, "Lib", "site-packages")
else:
raise DistutilsPlatformError(
"I don't know where Python installs its library "
"on platform '%s'" % os.name)
def customize_compiler(compiler):
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"""Do any platform-specific customization of a CCompiler instance.
Mainly needed on Unix, so we can plug in the information that
varies across Unices and is stored in Python's Makefile.
"""
if compiler.compiler_type == "unix":
(cc, opt, ccshared, ldshared, so_ext) = \
get_config_vars('CC', 'OPT', 'CCSHARED', 'LDSHARED', 'SO')
cc_cmd = cc + ' ' + opt
compiler.set_executables(
preprocessor=cc + " -E", # not always!
compiler=cc_cmd,
compiler_so=cc_cmd + ' ' + ccshared,
linker_so=ldshared,
linker_exe=cc)
compiler.shared_lib_extension = so_ext
def get_config_h_filename():
"""Return full pathname of installed pyconfig.h file."""
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if python_build:
inc_dir = os.curdir
else:
inc_dir = get_python_inc(plat_specific=1)
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if sys.version < '2.2':
config_h = 'config.h'
else:
# The name of the config.h file changed in 2.2
config_h = 'pyconfig.h'
return os.path.join(inc_dir, config_h)
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def get_makefile_filename():
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"""Return full pathname of installed Makefile from the Python build."""
if python_build:
return './Makefile'
lib_dir = get_python_lib(plat_specific=1, standard_lib=1)
return os.path.join(lib_dir, "config", "Makefile")
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def parse_config_h(fp, g=None):
"""Parse a config.h-style file.
A dictionary containing name/value pairs is returned. If an
optional dictionary is passed in as the second argument, it is
used instead of a new dictionary.
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"""
if g is None:
g = {}
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define_rx = re.compile("#define ([A-Z][A-Z0-9_]+) (.*)\n")
undef_rx = re.compile("/[*] #undef ([A-Z][A-Z0-9_]+) [*]/\n")
#
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while 1:
line = fp.readline()
if not line:
break
m = define_rx.match(line)
if m:
n, v = m.group(1, 2)
try: v = string.atoi(v)
except ValueError: pass
g[n] = v
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else:
m = undef_rx.match(line)
if m:
g[m.group(1)] = 0
return g
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# Regexes needed for parsing Makefile (and similar syntaxes,
# like old-style Setup files).
_variable_rx = re.compile("([a-zA-Z][a-zA-Z0-9_]+)\s*=\s*(.*)")
_findvar1_rx = re.compile(r"\$\(([A-Za-z][A-Za-z0-9_]*)\)")
_findvar2_rx = re.compile(r"\${([A-Za-z][A-Za-z0-9_]*)}")
def parse_makefile(fn, g=None):
"""Parse a Makefile-style file.
A dictionary containing name/value pairs is returned. If an
optional dictionary is passed in as the second argument, it is
used instead of a new dictionary.
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"""
from distutils.text_file import TextFile
fp = TextFile(fn, strip_comments=1, skip_blanks=1, join_lines=1)
if g is None:
g = {}
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done = {}
notdone = {}
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while 1:
line = fp.readline()
if line is None: # eof
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break
m = _variable_rx.match(line)
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if m:
n, v = m.group(1, 2)
v = string.strip(v)
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if "$" in v:
notdone[n] = v
else:
try: v = string.atoi(v)
except ValueError: pass
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done[n] = v
# do variable interpolation here
while notdone:
for name in notdone.keys():
value = notdone[name]
m = _findvar1_rx.search(value) or _findvar2_rx.search(value)
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if m:
n = m.group(1)
if done.has_key(n):
after = value[m.end():]
value = value[:m.start()] + str(done[n]) + after
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if "$" in after:
notdone[name] = value
else:
try: value = string.atoi(value)
except ValueError:
done[name] = string.strip(value)
else:
done[name] = value
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del notdone[name]
elif notdone.has_key(n):
# get it on a subsequent round
pass
else:
done[n] = ""
after = value[m.end():]
value = value[:m.start()] + after
if "$" in after:
notdone[name] = value
else:
try: value = string.atoi(value)
except ValueError:
done[name] = string.strip(value)
else:
done[name] = value
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del notdone[name]
else:
# bogus variable reference; just drop it since we can't deal
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del notdone[name]
fp.close()
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# save the results in the global dictionary
g.update(done)
return g
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def expand_makefile_vars(s, vars):
"""Expand Makefile-style variables -- "${foo}" or "$(foo)" -- in
'string' according to 'vars' (a dictionary mapping variable names to
values). Variables not present in 'vars' are silently expanded to the
empty string. The variable values in 'vars' should not contain further
variable expansions; if 'vars' is the output of 'parse_makefile()',
you're fine. Returns a variable-expanded version of 's'.
"""
# This algorithm does multiple expansion, so if vars['foo'] contains
# "${bar}", it will expand ${foo} to ${bar}, and then expand
# ${bar}... and so forth. This is fine as long as 'vars' comes from
# 'parse_makefile()', which takes care of such expansions eagerly,
# according to make's variable expansion semantics.
while 1:
m = _findvar1_rx.search(s) or _findvar2_rx.search(s)
if m:
name = m.group(1)
(beg, end) = m.span()
s = s[0:beg] + vars.get(m.group(1)) + s[end:]
else:
break
return s
_config_vars = None
def _init_posix():
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"""Initialize the module as appropriate for POSIX systems."""
g = {}
# load the installed Makefile:
try:
filename = get_makefile_filename()
parse_makefile(filename, g)
except IOError, msg:
my_msg = "invalid Python installation: unable to open %s" % filename
if hasattr(msg, "strerror"):
my_msg = my_msg + " (%s)" % msg.strerror
raise DistutilsPlatformError(my_msg)
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# On AIX, there are wrong paths to the linker scripts in the Makefile
# -- these paths are relative to the Python source, but when installed
# the scripts are in another directory.
if python_build:
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g['LDSHARED'] = g['BLDSHARED']
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elif sys.version < '2.1':
# The following two branches are for 1.5.2 compatibility.
if sys.platform == 'aix4': # what about AIX 3.x ?
# Linker script is in the config directory, not in Modules as the
# Makefile says.
python_lib = get_python_lib(standard_lib=1)
ld_so_aix = os.path.join(python_lib, 'config', 'ld_so_aix')
python_exp = os.path.join(python_lib, 'config', 'python.exp')
g['LDSHARED'] = "%s %s -bI:%s" % (ld_so_aix, g['CC'], python_exp)
elif sys.platform == 'beos':
# Linker script is in the config directory. In the Makefile it is
# relative to the srcdir, which after installation no longer makes
# sense.
python_lib = get_python_lib(standard_lib=1)
linkerscript_name = os.path.basename(string.split(g['LDSHARED'])[0])
linkerscript = os.path.join(python_lib, 'config', linkerscript_name)
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# XXX this isn't the right place to do this: adding the Python
# library to the link, if needed, should be in the "build_ext"
# command. (It's also needed for non-MS compilers on Windows, and
# it's taken care of for them by the 'build_ext.get_libraries()'
# method.)
g['LDSHARED'] = ("%s -L%s/lib -lpython%s" %
(linkerscript, PREFIX, sys.version[0:3]))
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global _config_vars
_config_vars = g
def _init_nt():
"""Initialize the module as appropriate for NT"""
g = {}
# set basic install directories
g['LIBDEST'] = get_python_lib(plat_specific=0, standard_lib=1)
g['BINLIBDEST'] = get_python_lib(plat_specific=1, standard_lib=1)
# XXX hmmm.. a normal install puts include files here
g['INCLUDEPY'] = get_python_inc(plat_specific=0)
g['SO'] = '.pyd'
g['EXE'] = ".exe"
global _config_vars
_config_vars = g
def _init_mac():
"""Initialize the module as appropriate for Macintosh systems"""
g = {}
# set basic install directories
g['LIBDEST'] = get_python_lib(plat_specific=0, standard_lib=1)
g['BINLIBDEST'] = get_python_lib(plat_specific=1, standard_lib=1)
# XXX hmmm.. a normal install puts include files here
g['INCLUDEPY'] = get_python_inc(plat_specific=0)
import MacOS
if not hasattr(MacOS, 'runtimemodel'):
g['SO'] = '.ppc.slb'
else:
g['SO'] = '.%s.slb' % MacOS.runtimemodel
# XXX are these used anywhere?
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g['install_lib'] = os.path.join(EXEC_PREFIX, "Lib")
g['install_platlib'] = os.path.join(EXEC_PREFIX, "Mac", "Lib")
global _config_vars
_config_vars = g
def _init_os2():
"""Initialize the module as appropriate for OS/2"""
g = {}
# set basic install directories
g['LIBDEST'] = get_python_lib(plat_specific=0, standard_lib=1)
g['BINLIBDEST'] = get_python_lib(plat_specific=1, standard_lib=1)
# XXX hmmm.. a normal install puts include files here
g['INCLUDEPY'] = get_python_inc(plat_specific=0)
g['SO'] = '.pyd'
g['EXE'] = ".exe"
global _config_vars
_config_vars = g
def get_config_vars(*args):
"""With no arguments, return a dictionary of all configuration
variables relevant for the current platform. Generally this includes
everything needed to build extensions and install both pure modules and
extensions. On Unix, this means every variable defined in Python's
installed Makefile; on Windows and Mac OS it's a much smaller set.
With arguments, return a list of values that result from looking up
each argument in the configuration variable dictionary.
"""
global _config_vars
if _config_vars is None:
func = globals().get("_init_" + os.name)
if func:
func()
else:
_config_vars = {}
# Normalized versions of prefix and exec_prefix are handy to have;
# in fact, these are the standard versions used most places in the
# Distutils.
_config_vars['prefix'] = PREFIX
_config_vars['exec_prefix'] = EXEC_PREFIX
if args:
vals = []
for name in args:
vals.append(_config_vars.get(name))
return vals
else:
return _config_vars
def get_config_var(name):
"""Return the value of a single variable using the dictionary
returned by 'get_config_vars()'. Equivalent to
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get_config_vars().get(name)
"""
return get_config_vars().get(name)