/usr/lib/python3.7/_osx_support.py is in libpython3.7-stdlib 3.7.0~b3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 | """Shared OS X support functions."""
import os
import re
import sys
__all__ = [
'compiler_fixup',
'customize_config_vars',
'customize_compiler',
'get_platform_osx',
]
# configuration variables that may contain universal build flags,
# like "-arch" or "-isdkroot", that may need customization for
# the user environment
_UNIVERSAL_CONFIG_VARS = ('CFLAGS', 'LDFLAGS', 'CPPFLAGS', 'BASECFLAGS',
'BLDSHARED', 'LDSHARED', 'CC', 'CXX',
'PY_CFLAGS', 'PY_LDFLAGS', 'PY_CPPFLAGS',
'PY_CORE_CFLAGS')
# configuration variables that may contain compiler calls
_COMPILER_CONFIG_VARS = ('BLDSHARED', 'LDSHARED', 'CC', 'CXX')
# prefix added to original configuration variable names
_INITPRE = '_OSX_SUPPORT_INITIAL_'
def _find_executable(executable, path=None):
"""Tries to find 'executable' in the directories listed in 'path'.
A string listing directories separated by 'os.pathsep'; defaults to
os.environ['PATH']. Returns the complete filename or None if not found.
"""
if path is None:
path = os.environ['PATH']
paths = path.split(os.pathsep)
base, ext = os.path.splitext(executable)
if (sys.platform == 'win32') and (ext != '.exe'):
executable = executable + '.exe'
if not os.path.isfile(executable):
for p in paths:
f = os.path.join(p, executable)
if os.path.isfile(f):
# the file exists, we have a shot at spawn working
return f
return None
else:
return executable
def _read_output(commandstring):
"""Output from successful command execution or None"""
# Similar to os.popen(commandstring, "r").read(),
# but without actually using os.popen because that
# function is not usable during python bootstrap.
# tempfile is also not available then.
import contextlib
try:
import tempfile
fp = tempfile.NamedTemporaryFile()
except ImportError:
fp = open("/tmp/_osx_support.%s"%(
os.getpid(),), "w+b")
with contextlib.closing(fp) as fp:
cmd = "%s 2>/dev/null >'%s'" % (commandstring, fp.name)
return fp.read().decode('utf-8').strip() if not os.system(cmd) else None
def _find_build_tool(toolname):
"""Find a build tool on current path or using xcrun"""
return (_find_executable(toolname)
or _read_output("/usr/bin/xcrun -find %s" % (toolname,))
or ''
)
_SYSTEM_VERSION = None
def _get_system_version():
"""Return the OS X system version as a string"""
# Reading this plist is a documented way to get the system
# version (see the documentation for the Gestalt Manager)
# We avoid using platform.mac_ver to avoid possible bootstrap issues during
# the build of Python itself (distutils is used to build standard library
# extensions).
global _SYSTEM_VERSION
if _SYSTEM_VERSION is None:
_SYSTEM_VERSION = ''
try:
f = open('/System/Library/CoreServices/SystemVersion.plist')
except OSError:
# We're on a plain darwin box, fall back to the default
# behaviour.
pass
else:
try:
m = re.search(r'<key>ProductUserVisibleVersion</key>\s*'
r'<string>(.*?)</string>', f.read())
finally:
f.close()
if m is not None:
_SYSTEM_VERSION = '.'.join(m.group(1).split('.')[:2])
# else: fall back to the default behaviour
return _SYSTEM_VERSION
def _remove_original_values(_config_vars):
"""Remove original unmodified values for testing"""
# This is needed for higher-level cross-platform tests of get_platform.
for k in list(_config_vars):
if k.startswith(_INITPRE):
del _config_vars[k]
def _save_modified_value(_config_vars, cv, newvalue):
"""Save modified and original unmodified value of configuration var"""
oldvalue = _config_vars.get(cv, '')
if (oldvalue != newvalue) and (_INITPRE + cv not in _config_vars):
_config_vars[_INITPRE + cv] = oldvalue
_config_vars[cv] = newvalue
def _supports_universal_builds():
"""Returns True if universal builds are supported on this system"""
# As an approximation, we assume that if we are running on 10.4 or above,
# then we are running with an Xcode environment that supports universal
# builds, in particular -isysroot and -arch arguments to the compiler. This
# is in support of allowing 10.4 universal builds to run on 10.3.x systems.
osx_version = _get_system_version()
if osx_version:
try:
osx_version = tuple(int(i) for i in osx_version.split('.'))
except ValueError:
osx_version = ''
return bool(osx_version >= (10, 4)) if osx_version else False
def _find_appropriate_compiler(_config_vars):
"""Find appropriate C compiler for extension module builds"""
# Issue #13590:
# The OSX location for the compiler varies between OSX
# (or rather Xcode) releases. With older releases (up-to 10.5)
# the compiler is in /usr/bin, with newer releases the compiler
# can only be found inside Xcode.app if the "Command Line Tools"
# are not installed.
#
# Furthermore, the compiler that can be used varies between
# Xcode releases. Up to Xcode 4 it was possible to use 'gcc-4.2'
# as the compiler, after that 'clang' should be used because
# gcc-4.2 is either not present, or a copy of 'llvm-gcc' that
# miscompiles Python.
# skip checks if the compiler was overridden with a CC env variable
if 'CC' in os.environ:
return _config_vars
# The CC config var might contain additional arguments.
# Ignore them while searching.
cc = oldcc = _config_vars['CC'].split()[0]
if not _find_executable(cc):
# Compiler is not found on the shell search PATH.
# Now search for clang, first on PATH (if the Command LIne
# Tools have been installed in / or if the user has provided
# another location via CC). If not found, try using xcrun
# to find an uninstalled clang (within a selected Xcode).
# NOTE: Cannot use subprocess here because of bootstrap
# issues when building Python itself (and os.popen is
# implemented on top of subprocess and is therefore not
# usable as well)
cc = _find_build_tool('clang')
elif os.path.basename(cc).startswith('gcc'):
# Compiler is GCC, check if it is LLVM-GCC
data = _read_output("'%s' --version"
% (cc.replace("'", "'\"'\"'"),))
if data and 'llvm-gcc' in data:
# Found LLVM-GCC, fall back to clang
cc = _find_build_tool('clang')
if not cc:
raise SystemError(
"Cannot locate working compiler")
if cc != oldcc:
# Found a replacement compiler.
# Modify config vars using new compiler, if not already explicitly
# overridden by an env variable, preserving additional arguments.
for cv in _COMPILER_CONFIG_VARS:
if cv in _config_vars and cv not in os.environ:
cv_split = _config_vars[cv].split()
cv_split[0] = cc if cv != 'CXX' else cc + '++'
_save_modified_value(_config_vars, cv, ' '.join(cv_split))
return _config_vars
def _remove_universal_flags(_config_vars):
"""Remove all universal build arguments from config vars"""
for cv in _UNIVERSAL_CONFIG_VARS:
# Do not alter a config var explicitly overridden by env var
if cv in _config_vars and cv not in os.environ:
flags = _config_vars[cv]
flags = re.sub(r'-arch\s+\w+\s', ' ', flags, flags=re.ASCII)
flags = re.sub('-isysroot [^ \t]*', ' ', flags)
_save_modified_value(_config_vars, cv, flags)
return _config_vars
def _remove_unsupported_archs(_config_vars):
"""Remove any unsupported archs from config vars"""
# Different Xcode releases support different sets for '-arch'
# flags. In particular, Xcode 4.x no longer supports the
# PPC architectures.
#
# This code automatically removes '-arch ppc' and '-arch ppc64'
# when these are not supported. That makes it possible to
# build extensions on OSX 10.7 and later with the prebuilt
# 32-bit installer on the python.org website.
# skip checks if the compiler was overridden with a CC env variable
if 'CC' in os.environ:
return _config_vars
if re.search(r'-arch\s+ppc', _config_vars['CFLAGS']) is not None:
# NOTE: Cannot use subprocess here because of bootstrap
# issues when building Python itself
status = os.system(
"""echo 'int main{};' | """
"""'%s' -c -arch ppc -x c -o /dev/null /dev/null 2>/dev/null"""
%(_config_vars['CC'].replace("'", "'\"'\"'"),))
if status:
# The compile failed for some reason. Because of differences
# across Xcode and compiler versions, there is no reliable way
# to be sure why it failed. Assume here it was due to lack of
# PPC support and remove the related '-arch' flags from each
# config variables not explicitly overridden by an environment
# variable. If the error was for some other reason, we hope the
# failure will show up again when trying to compile an extension
# module.
for cv in _UNIVERSAL_CONFIG_VARS:
if cv in _config_vars and cv not in os.environ:
flags = _config_vars[cv]
flags = re.sub(r'-arch\s+ppc\w*\s', ' ', flags)
_save_modified_value(_config_vars, cv, flags)
return _config_vars
def _override_all_archs(_config_vars):
"""Allow override of all archs with ARCHFLAGS env var"""
# NOTE: This name was introduced by Apple in OSX 10.5 and
# is used by several scripting languages distributed with
# that OS release.
if 'ARCHFLAGS' in os.environ:
arch = os.environ['ARCHFLAGS']
for cv in _UNIVERSAL_CONFIG_VARS:
if cv in _config_vars and '-arch' in _config_vars[cv]:
flags = _config_vars[cv]
flags = re.sub(r'-arch\s+\w+\s', ' ', flags)
flags = flags + ' ' + arch
_save_modified_value(_config_vars, cv, flags)
return _config_vars
def _check_for_unavailable_sdk(_config_vars):
"""Remove references to any SDKs not available"""
# If we're on OSX 10.5 or later and the user tries to
# compile an extension using an SDK that is not present
# on the current machine it is better to not use an SDK
# than to fail. This is particularly important with
# the standalone Command Line Tools alternative to a
# full-blown Xcode install since the CLT packages do not
# provide SDKs. If the SDK is not present, it is assumed
# that the header files and dev libs have been installed
# to /usr and /System/Library by either a standalone CLT
# package or the CLT component within Xcode.
cflags = _config_vars.get('CFLAGS', '')
m = re.search(r'-isysroot\s+(\S+)', cflags)
if m is not None:
sdk = m.group(1)
if not os.path.exists(sdk):
for cv in _UNIVERSAL_CONFIG_VARS:
# Do not alter a config var explicitly overridden by env var
if cv in _config_vars and cv not in os.environ:
flags = _config_vars[cv]
flags = re.sub(r'-isysroot\s+\S+(?:\s|$)', ' ', flags)
_save_modified_value(_config_vars, cv, flags)
return _config_vars
def compiler_fixup(compiler_so, cc_args):
"""
This function will strip '-isysroot PATH' and '-arch ARCH' from the
compile flags if the user has specified one them in extra_compile_flags.
This is needed because '-arch ARCH' adds another architecture to the
build, without a way to remove an architecture. Furthermore GCC will
barf if multiple '-isysroot' arguments are present.
"""
stripArch = stripSysroot = False
compiler_so = list(compiler_so)
if not _supports_universal_builds():
# OSX before 10.4.0, these don't support -arch and -isysroot at
# all.
stripArch = stripSysroot = True
else:
stripArch = '-arch' in cc_args
stripSysroot = '-isysroot' in cc_args
if stripArch or 'ARCHFLAGS' in os.environ:
while True:
try:
index = compiler_so.index('-arch')
# Strip this argument and the next one:
del compiler_so[index:index+2]
except ValueError:
break
if 'ARCHFLAGS' in os.environ and not stripArch:
# User specified different -arch flags in the environ,
# see also distutils.sysconfig
compiler_so = compiler_so + os.environ['ARCHFLAGS'].split()
if stripSysroot:
while True:
try:
index = compiler_so.index('-isysroot')
# Strip this argument and the next one:
del compiler_so[index:index+2]
except ValueError:
break
# Check if the SDK that is used during compilation actually exists,
# the universal build requires the usage of a universal SDK and not all
# users have that installed by default.
sysroot = None
if '-isysroot' in cc_args:
idx = cc_args.index('-isysroot')
sysroot = cc_args[idx+1]
elif '-isysroot' in compiler_so:
idx = compiler_so.index('-isysroot')
sysroot = compiler_so[idx+1]
if sysroot and not os.path.isdir(sysroot):
from distutils import log
log.warn("Compiling with an SDK that doesn't seem to exist: %s",
sysroot)
log.warn("Please check your Xcode installation")
return compiler_so
def customize_config_vars(_config_vars):
"""Customize Python build configuration variables.
Called internally from sysconfig with a mutable mapping
containing name/value pairs parsed from the configured
makefile used to build this interpreter. Returns
the mapping updated as needed to reflect the environment
in which the interpreter is running; in the case of
a Python from a binary installer, the installed
environment may be very different from the build
environment, i.e. different OS levels, different
built tools, different available CPU architectures.
This customization is performed whenever
distutils.sysconfig.get_config_vars() is first
called. It may be used in environments where no
compilers are present, i.e. when installing pure
Python dists. Customization of compiler paths
and detection of unavailable archs is deferred
until the first extension module build is
requested (in distutils.sysconfig.customize_compiler).
Currently called from distutils.sysconfig
"""
if not _supports_universal_builds():
# On Mac OS X before 10.4, check if -arch and -isysroot
# are in CFLAGS or LDFLAGS and remove them if they are.
# This is needed when building extensions on a 10.3 system
# using a universal build of python.
_remove_universal_flags(_config_vars)
# Allow user to override all archs with ARCHFLAGS env var
_override_all_archs(_config_vars)
# Remove references to sdks that are not found
_check_for_unavailable_sdk(_config_vars)
return _config_vars
def customize_compiler(_config_vars):
"""Customize compiler path and configuration variables.
This customization is performed when the first
extension module build is requested
in distutils.sysconfig.customize_compiler).
"""
# Find a compiler to use for extension module builds
_find_appropriate_compiler(_config_vars)
# Remove ppc arch flags if not supported here
_remove_unsupported_archs(_config_vars)
# Allow user to override all archs with ARCHFLAGS env var
_override_all_archs(_config_vars)
return _config_vars
def get_platform_osx(_config_vars, osname, release, machine):
"""Filter values for get_platform()"""
# called from get_platform() in sysconfig and distutils.util
#
# For our purposes, we'll assume that the system version from
# distutils' perspective is what MACOSX_DEPLOYMENT_TARGET is set
# to. This makes the compatibility story a bit more sane because the
# machine is going to compile and link as if it were
# MACOSX_DEPLOYMENT_TARGET.
macver = _config_vars.get('MACOSX_DEPLOYMENT_TARGET', '')
macrelease = _get_system_version() or macver
macver = macver or macrelease
if macver:
release = macver
osname = "macosx"
# Use the original CFLAGS value, if available, so that we
# return the same machine type for the platform string.
# Otherwise, distutils may consider this a cross-compiling
# case and disallow installs.
cflags = _config_vars.get(_INITPRE+'CFLAGS',
_config_vars.get('CFLAGS', ''))
if macrelease:
try:
macrelease = tuple(int(i) for i in macrelease.split('.')[0:2])
except ValueError:
macrelease = (10, 0)
else:
# assume no universal support
macrelease = (10, 0)
if (macrelease >= (10, 4)) and '-arch' in cflags.strip():
# The universal build will build fat binaries, but not on
# systems before 10.4
machine = 'fat'
archs = re.findall(r'-arch\s+(\S+)', cflags)
archs = tuple(sorted(set(archs)))
if len(archs) == 1:
machine = archs[0]
elif archs == ('i386', 'ppc'):
machine = 'fat'
elif archs == ('i386', 'x86_64'):
machine = 'intel'
elif archs == ('i386', 'ppc', 'x86_64'):
machine = 'fat3'
elif archs == ('ppc64', 'x86_64'):
machine = 'fat64'
elif archs == ('i386', 'ppc', 'ppc64', 'x86_64'):
machine = 'universal'
else:
raise ValueError(
"Don't know machine value for archs=%r" % (archs,))
elif machine == 'i386':
# On OSX the machine type returned by uname is always the
# 32-bit variant, even if the executable architecture is
# the 64-bit variant
if sys.maxsize >= 2**32:
machine = 'x86_64'
elif machine in ('PowerPC', 'Power_Macintosh'):
# Pick a sane name for the PPC architecture.
# See 'i386' case
if sys.maxsize >= 2**32:
machine = 'ppc64'
else:
machine = 'ppc'
return (osname, release, machine)
|