mirror of
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488 lines
18 KiB
Python
488 lines
18 KiB
Python
"""Shared OS X support functions."""
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import os
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import re
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import sys
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__all__ = [
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'compiler_fixup',
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'customize_config_vars',
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'customize_compiler',
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'get_platform_osx',
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]
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# configuration variables that may contain universal build flags,
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# like "-arch" or "-isdkroot", that may need customization for
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# the user environment
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_UNIVERSAL_CONFIG_VARS = ('CFLAGS', 'LDFLAGS', 'CPPFLAGS', 'BASECFLAGS',
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'BLDSHARED', 'LDSHARED', 'CC', 'CXX',
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'PY_CFLAGS', 'PY_LDFLAGS', 'PY_CPPFLAGS',
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'PY_CORE_CFLAGS')
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# configuration variables that may contain compiler calls
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_COMPILER_CONFIG_VARS = ('BLDSHARED', 'LDSHARED', 'CC', 'CXX')
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# prefix added to original configuration variable names
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_INITPRE = '_OSX_SUPPORT_INITIAL_'
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def _find_executable(executable, path=None):
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"""Tries to find 'executable' in the directories listed in 'path'.
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A string listing directories separated by 'os.pathsep'; defaults to
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os.environ['PATH']. Returns the complete filename or None if not found.
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"""
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if path is None:
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path = os.environ['PATH']
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paths = path.split(os.pathsep)
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base, ext = os.path.splitext(executable)
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if (sys.platform == 'win32') and (ext != '.exe'):
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executable = executable + '.exe'
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if not os.path.isfile(executable):
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for p in paths:
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f = os.path.join(p, executable)
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if os.path.isfile(f):
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# the file exists, we have a shot at spawn working
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return f
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return None
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else:
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return executable
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def _read_output(commandstring):
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"""Output from succesful command execution or None"""
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# Similar to os.popen(commandstring, "r").read(),
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# but without actually using os.popen because that
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# function is not usable during python bootstrap.
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# tempfile is also not available then.
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import contextlib
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try:
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import tempfile
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fp = tempfile.NamedTemporaryFile()
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except ImportError:
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fp = open("/tmp/_osx_support.%s"%(
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os.getpid(),), "w+b")
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with contextlib.closing(fp) as fp:
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cmd = "%s 2>/dev/null >'%s'" % (commandstring, fp.name)
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return fp.read().decode('utf-8').strip() if not os.system(cmd) else None
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def _find_build_tool(toolname):
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"""Find a build tool on current path or using xcrun"""
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return (_find_executable(toolname)
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or _read_output("/usr/bin/xcrun -find %s" % (toolname,))
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or ''
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)
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_SYSTEM_VERSION = None
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def _get_system_version():
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"""Return the OS X system version as a string"""
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# Reading this plist is a documented way to get the system
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# version (see the documentation for the Gestalt Manager)
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# We avoid using platform.mac_ver to avoid possible bootstrap issues during
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# the build of Python itself (distutils is used to build standard library
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# extensions).
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global _SYSTEM_VERSION
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if _SYSTEM_VERSION is None:
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_SYSTEM_VERSION = ''
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try:
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f = open('/System/Library/CoreServices/SystemVersion.plist')
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except OSError:
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# We're on a plain darwin box, fall back to the default
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# behaviour.
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pass
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else:
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try:
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m = re.search(r'<key>ProductUserVisibleVersion</key>\s*'
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r'<string>(.*?)</string>', f.read())
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finally:
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f.close()
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if m is not None:
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_SYSTEM_VERSION = '.'.join(m.group(1).split('.')[:2])
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# else: fall back to the default behaviour
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return _SYSTEM_VERSION
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def _remove_original_values(_config_vars):
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"""Remove original unmodified values for testing"""
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# This is needed for higher-level cross-platform tests of get_platform.
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for k in list(_config_vars):
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if k.startswith(_INITPRE):
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del _config_vars[k]
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def _save_modified_value(_config_vars, cv, newvalue):
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"""Save modified and original unmodified value of configuration var"""
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oldvalue = _config_vars.get(cv, '')
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if (oldvalue != newvalue) and (_INITPRE + cv not in _config_vars):
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_config_vars[_INITPRE + cv] = oldvalue
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_config_vars[cv] = newvalue
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def _supports_universal_builds():
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"""Returns True if universal builds are supported on this system"""
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# As an approximation, we assume that if we are running on 10.4 or above,
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# then we are running with an Xcode environment that supports universal
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# builds, in particular -isysroot and -arch arguments to the compiler. This
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# is in support of allowing 10.4 universal builds to run on 10.3.x systems.
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osx_version = _get_system_version()
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if osx_version:
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try:
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osx_version = tuple(int(i) for i in osx_version.split('.'))
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except ValueError:
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osx_version = ''
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return bool(osx_version >= (10, 4)) if osx_version else False
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def _find_appropriate_compiler(_config_vars):
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"""Find appropriate C compiler for extension module builds"""
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# Issue #13590:
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# The OSX location for the compiler varies between OSX
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# (or rather Xcode) releases. With older releases (up-to 10.5)
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# the compiler is in /usr/bin, with newer releases the compiler
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# can only be found inside Xcode.app if the "Command Line Tools"
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# are not installed.
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#
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# Futhermore, the compiler that can be used varies between
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# Xcode releases. Upto Xcode 4 it was possible to use 'gcc-4.2'
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# as the compiler, after that 'clang' should be used because
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# gcc-4.2 is either not present, or a copy of 'llvm-gcc' that
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# miscompiles Python.
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# skip checks if the compiler was overriden with a CC env variable
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if 'CC' in os.environ:
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return _config_vars
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# The CC config var might contain additional arguments.
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# Ignore them while searching.
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cc = oldcc = _config_vars['CC'].split()[0]
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if not _find_executable(cc):
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# Compiler is not found on the shell search PATH.
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# Now search for clang, first on PATH (if the Command LIne
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# Tools have been installed in / or if the user has provided
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# another location via CC). If not found, try using xcrun
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# to find an uninstalled clang (within a selected Xcode).
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# NOTE: Cannot use subprocess here because of bootstrap
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# issues when building Python itself (and os.popen is
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# implemented on top of subprocess and is therefore not
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# usable as well)
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cc = _find_build_tool('clang')
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elif os.path.basename(cc).startswith('gcc'):
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# Compiler is GCC, check if it is LLVM-GCC
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data = _read_output("'%s' --version"
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% (cc.replace("'", "'\"'\"'"),))
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if 'llvm-gcc' in data:
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# Found LLVM-GCC, fall back to clang
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cc = _find_build_tool('clang')
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if not cc:
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raise SystemError(
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"Cannot locate working compiler")
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if cc != oldcc:
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# Found a replacement compiler.
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# Modify config vars using new compiler, if not already explictly
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# overriden by an env variable, preserving additional arguments.
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for cv in _COMPILER_CONFIG_VARS:
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if cv in _config_vars and cv not in os.environ:
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cv_split = _config_vars[cv].split()
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cv_split[0] = cc if cv != 'CXX' else cc + '++'
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_save_modified_value(_config_vars, cv, ' '.join(cv_split))
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return _config_vars
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def _remove_universal_flags(_config_vars):
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"""Remove all universal build arguments from config vars"""
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for cv in _UNIVERSAL_CONFIG_VARS:
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# Do not alter a config var explicitly overriden by env var
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if cv in _config_vars and cv not in os.environ:
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flags = _config_vars[cv]
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flags = re.sub('-arch\s+\w+\s', ' ', flags, re.ASCII)
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flags = re.sub('-isysroot [^ \t]*', ' ', flags)
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_save_modified_value(_config_vars, cv, flags)
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return _config_vars
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def _remove_unsupported_archs(_config_vars):
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"""Remove any unsupported archs from config vars"""
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# Different Xcode releases support different sets for '-arch'
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# flags. In particular, Xcode 4.x no longer supports the
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# PPC architectures.
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#
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# This code automatically removes '-arch ppc' and '-arch ppc64'
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# when these are not supported. That makes it possible to
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# build extensions on OSX 10.7 and later with the prebuilt
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# 32-bit installer on the python.org website.
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# skip checks if the compiler was overriden with a CC env variable
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if 'CC' in os.environ:
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return _config_vars
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if re.search('-arch\s+ppc', _config_vars['CFLAGS']) is not None:
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# NOTE: Cannot use subprocess here because of bootstrap
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# issues when building Python itself
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status = os.system("'%s' -arch ppc -x c /dev/null 2>/dev/null"%(
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_config_vars['CC'].replace("'", "'\"'\"'"),))
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# The Apple compiler drivers return status 255 if no PPC
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if (status >> 8) == 255:
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# Compiler doesn't support PPC, remove the related
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# '-arch' flags if not explicitly overridden by an
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# environment variable
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for cv in _UNIVERSAL_CONFIG_VARS:
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if cv in _config_vars and cv not in os.environ:
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flags = _config_vars[cv]
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flags = re.sub('-arch\s+ppc\w*\s', ' ', flags)
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_save_modified_value(_config_vars, cv, flags)
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return _config_vars
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def _override_all_archs(_config_vars):
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"""Allow override of all archs with ARCHFLAGS env var"""
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# NOTE: This name was introduced by Apple in OSX 10.5 and
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# is used by several scripting languages distributed with
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# that OS release.
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if 'ARCHFLAGS' in os.environ:
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arch = os.environ['ARCHFLAGS']
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for cv in _UNIVERSAL_CONFIG_VARS:
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if cv in _config_vars and '-arch' in _config_vars[cv]:
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flags = _config_vars[cv]
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flags = re.sub('-arch\s+\w+\s', ' ', flags)
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flags = flags + ' ' + arch
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_save_modified_value(_config_vars, cv, flags)
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return _config_vars
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def _check_for_unavailable_sdk(_config_vars):
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"""Remove references to any SDKs not available"""
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# If we're on OSX 10.5 or later and the user tries to
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# compile an extension using an SDK that is not present
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# on the current machine it is better to not use an SDK
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# than to fail. This is particularly important with
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# the standalong Command Line Tools alternative to a
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# full-blown Xcode install since the CLT packages do not
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# provide SDKs. If the SDK is not present, it is assumed
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# that the header files and dev libs have been installed
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# to /usr and /System/Library by either a standalone CLT
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# package or the CLT component within Xcode.
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cflags = _config_vars.get('CFLAGS', '')
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m = re.search(r'-isysroot\s+(\S+)', cflags)
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if m is not None:
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sdk = m.group(1)
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if not os.path.exists(sdk):
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for cv in _UNIVERSAL_CONFIG_VARS:
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# Do not alter a config var explicitly overriden by env var
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if cv in _config_vars and cv not in os.environ:
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flags = _config_vars[cv]
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flags = re.sub(r'-isysroot\s+\S+(?:\s|$)', ' ', flags)
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_save_modified_value(_config_vars, cv, flags)
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return _config_vars
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def compiler_fixup(compiler_so, cc_args):
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"""
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This function will strip '-isysroot PATH' and '-arch ARCH' from the
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compile flags if the user has specified one them in extra_compile_flags.
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This is needed because '-arch ARCH' adds another architecture to the
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build, without a way to remove an architecture. Furthermore GCC will
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barf if multiple '-isysroot' arguments are present.
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"""
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stripArch = stripSysroot = False
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compiler_so = list(compiler_so)
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if not _supports_universal_builds():
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# OSX before 10.4.0, these don't support -arch and -isysroot at
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# all.
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stripArch = stripSysroot = True
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else:
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stripArch = '-arch' in cc_args
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stripSysroot = '-isysroot' in cc_args
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if stripArch or 'ARCHFLAGS' in os.environ:
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while True:
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try:
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index = compiler_so.index('-arch')
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# Strip this argument and the next one:
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del compiler_so[index:index+2]
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except ValueError:
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break
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if 'ARCHFLAGS' in os.environ and not stripArch:
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# User specified different -arch flags in the environ,
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# see also distutils.sysconfig
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compiler_so = compiler_so + os.environ['ARCHFLAGS'].split()
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if stripSysroot:
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while True:
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try:
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index = compiler_so.index('-isysroot')
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# Strip this argument and the next one:
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del compiler_so[index:index+2]
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except ValueError:
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break
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# Check if the SDK that is used during compilation actually exists,
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# the universal build requires the usage of a universal SDK and not all
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# users have that installed by default.
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sysroot = None
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if '-isysroot' in cc_args:
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idx = cc_args.index('-isysroot')
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sysroot = cc_args[idx+1]
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elif '-isysroot' in compiler_so:
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idx = compiler_so.index('-isysroot')
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sysroot = compiler_so[idx+1]
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if sysroot and not os.path.isdir(sysroot):
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from distutils import log
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log.warn("Compiling with an SDK that doesn't seem to exist: %s",
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sysroot)
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log.warn("Please check your Xcode installation")
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return compiler_so
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def customize_config_vars(_config_vars):
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"""Customize Python build configuration variables.
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Called internally from sysconfig with a mutable mapping
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containing name/value pairs parsed from the configured
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makefile used to build this interpreter. Returns
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the mapping updated as needed to reflect the environment
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in which the interpreter is running; in the case of
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a Python from a binary installer, the installed
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environment may be very different from the build
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environment, i.e. different OS levels, different
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built tools, different available CPU architectures.
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This customization is performed whenever
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distutils.sysconfig.get_config_vars() is first
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called. It may be used in environments where no
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compilers are present, i.e. when installing pure
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Python dists. Customization of compiler paths
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and detection of unavailable archs is deferred
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until the first extention module build is
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requested (in distutils.sysconfig.customize_compiler).
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Currently called from distutils.sysconfig
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"""
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if not _supports_universal_builds():
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# On Mac OS X before 10.4, check if -arch and -isysroot
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# are in CFLAGS or LDFLAGS and remove them if they are.
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# This is needed when building extensions on a 10.3 system
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# using a universal build of python.
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_remove_universal_flags(_config_vars)
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# Allow user to override all archs with ARCHFLAGS env var
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_override_all_archs(_config_vars)
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# Remove references to sdks that are not found
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_check_for_unavailable_sdk(_config_vars)
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return _config_vars
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def customize_compiler(_config_vars):
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"""Customize compiler path and configuration variables.
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This customization is performed when the first
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extension module build is requested
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in distutils.sysconfig.customize_compiler).
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"""
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# Find a compiler to use for extension module builds
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_find_appropriate_compiler(_config_vars)
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# Remove ppc arch flags if not supported here
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_remove_unsupported_archs(_config_vars)
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# Allow user to override all archs with ARCHFLAGS env var
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_override_all_archs(_config_vars)
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return _config_vars
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def get_platform_osx(_config_vars, osname, release, machine):
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"""Filter values for get_platform()"""
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# called from get_platform() in sysconfig and distutils.util
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#
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# For our purposes, we'll assume that the system version from
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# distutils' perspective is what MACOSX_DEPLOYMENT_TARGET is set
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# to. This makes the compatibility story a bit more sane because the
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# machine is going to compile and link as if it were
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# MACOSX_DEPLOYMENT_TARGET.
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macver = _config_vars.get('MACOSX_DEPLOYMENT_TARGET', '')
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macrelease = _get_system_version() or macver
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macver = macver or macrelease
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if macver:
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release = macver
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osname = "macosx"
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# Use the original CFLAGS value, if available, so that we
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# return the same machine type for the platform string.
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# Otherwise, distutils may consider this a cross-compiling
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# case and disallow installs.
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cflags = _config_vars.get(_INITPRE+'CFLAGS',
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_config_vars.get('CFLAGS', ''))
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if ((macrelease + '.') >= '10.4.' and
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'-arch' in cflags.strip()):
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# The universal build will build fat binaries, but not on
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# systems before 10.4
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machine = 'fat'
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archs = re.findall('-arch\s+(\S+)', cflags)
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archs = tuple(sorted(set(archs)))
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if len(archs) == 1:
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machine = archs[0]
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elif archs == ('i386', 'ppc'):
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machine = 'fat'
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elif archs == ('i386', 'x86_64'):
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machine = 'intel'
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elif archs == ('i386', 'ppc', 'x86_64'):
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machine = 'fat3'
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elif archs == ('ppc64', 'x86_64'):
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machine = 'fat64'
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elif archs == ('i386', 'ppc', 'ppc64', 'x86_64'):
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machine = 'universal'
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else:
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raise ValueError(
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"Don't know machine value for archs=%r" % (archs,))
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elif machine == 'i386':
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# On OSX the machine type returned by uname is always the
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# 32-bit variant, even if the executable architecture is
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# the 64-bit variant
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if sys.maxsize >= 2**32:
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machine = 'x86_64'
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elif machine in ('PowerPC', 'Power_Macintosh'):
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# Pick a sane name for the PPC architecture.
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# See 'i386' case
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if sys.maxsize >= 2**32:
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machine = 'ppc64'
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else:
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machine = 'ppc'
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return (osname, release, machine)
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