| 1 | """Shared OS X support functions."""
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| 2 |
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| 3 | import os
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| 4 | import re
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| 5 | import sys
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| 6 |
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| 7 | __all__ = [
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| 8 | 'compiler_fixup',
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| 9 | 'customize_config_vars',
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| 10 | 'customize_compiler',
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| 11 | 'get_platform_osx',
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| 12 | ]
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| 13 |
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| 14 | # configuration variables that may contain universal build flags,
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| 15 | # like "-arch" or "-isdkroot", that may need customization for
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| 16 | # the user environment
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| 17 | _UNIVERSAL_CONFIG_VARS = ('CFLAGS', 'LDFLAGS', 'CPPFLAGS', 'BASECFLAGS',
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| 18 | 'BLDSHARED', 'LDSHARED', 'CC', 'CXX',
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| 19 | 'PY_CFLAGS', 'PY_LDFLAGS', 'PY_CPPFLAGS',
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| 20 | 'PY_CORE_CFLAGS')
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| 21 |
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| 22 | # configuration variables that may contain compiler calls
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| 23 | _COMPILER_CONFIG_VARS = ('BLDSHARED', 'LDSHARED', 'CC', 'CXX')
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| 24 |
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| 25 | # prefix added to original configuration variable names
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| 26 | _INITPRE = '_OSX_SUPPORT_INITIAL_'
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| 27 |
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| 28 |
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| 29 | def _find_executable(executable, path=None):
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| 30 | """Tries to find 'executable' in the directories listed in 'path'.
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| 31 |
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| 32 | A string listing directories separated by 'os.pathsep'; defaults to
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| 33 | os.environ['PATH']. Returns the complete filename or None if not found.
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| 34 | """
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| 35 | if path is None:
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| 36 | path = os.environ['PATH']
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| 37 |
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| 38 | paths = path.split(os.pathsep)
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| 39 | base, ext = os.path.splitext(executable)
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| 40 |
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| 41 | if (sys.platform == 'win32' or os.name == 'os2') and (ext != '.exe'):
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| 42 | executable = executable + '.exe'
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| 43 |
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| 44 | if not os.path.isfile(executable):
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| 45 | for p in paths:
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| 46 | f = os.path.join(p, executable)
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| 47 | if os.path.isfile(f):
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| 48 | # the file exists, we have a shot at spawn working
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| 49 | return f
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| 50 | return None
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| 51 | else:
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| 52 | return executable
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| 53 |
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| 54 |
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| 55 | def _read_output(commandstring):
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| 56 | """Output from successful command execution or None"""
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| 57 | # Similar to os.popen(commandstring, "r").read(),
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| 58 | # but without actually using os.popen because that
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| 59 | # function is not usable during python bootstrap.
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| 60 | # tempfile is also not available then.
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| 61 | import contextlib
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| 62 | try:
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| 63 | import tempfile
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| 64 | fp = tempfile.NamedTemporaryFile()
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| 65 | except ImportError:
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| 66 | fp = open("/tmp/_osx_support.%s"%(
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| 67 | os.getpid(),), "w+b")
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| 68 |
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| 69 | with contextlib.closing(fp) as fp:
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| 70 | cmd = "%s 2>/dev/null >'%s'" % (commandstring, fp.name)
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| 71 | return fp.read().strip() if not os.system(cmd) else None
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| 72 |
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| 73 |
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| 74 | def _find_build_tool(toolname):
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| 75 | """Find a build tool on current path or using xcrun"""
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| 76 | return (_find_executable(toolname)
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| 77 | or _read_output("/usr/bin/xcrun -find %s" % (toolname,))
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| 78 | or ''
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| 79 | )
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| 80 |
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| 81 | _SYSTEM_VERSION = None
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| 82 |
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| 83 | def _get_system_version():
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| 84 | """Return the OS X system version as a string"""
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| 85 | # Reading this plist is a documented way to get the system
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| 86 | # version (see the documentation for the Gestalt Manager)
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| 87 | # We avoid using platform.mac_ver to avoid possible bootstrap issues during
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| 88 | # the build of Python itself (distutils is used to build standard library
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| 89 | # extensions).
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| 90 |
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| 91 | global _SYSTEM_VERSION
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| 92 |
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| 93 | if _SYSTEM_VERSION is None:
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| 94 | _SYSTEM_VERSION = ''
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| 95 | try:
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| 96 | f = open('/System/Library/CoreServices/SystemVersion.plist')
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| 97 | except IOError:
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| 98 | # We're on a plain darwin box, fall back to the default
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| 99 | # behaviour.
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| 100 | pass
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| 101 | else:
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| 102 | try:
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| 103 | m = re.search(r'<key>ProductUserVisibleVersion</key>\s*'
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| 104 | r'<string>(.*?)</string>', f.read())
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| 105 | finally:
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| 106 | f.close()
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| 107 | if m is not None:
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| 108 | _SYSTEM_VERSION = '.'.join(m.group(1).split('.')[:2])
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| 109 | # else: fall back to the default behaviour
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| 110 |
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| 111 | return _SYSTEM_VERSION
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| 112 |
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| 113 | def _remove_original_values(_config_vars):
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| 114 | """Remove original unmodified values for testing"""
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| 115 | # This is needed for higher-level cross-platform tests of get_platform.
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| 116 | for k in list(_config_vars):
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| 117 | if k.startswith(_INITPRE):
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| 118 | del _config_vars[k]
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| 119 |
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| 120 | def _save_modified_value(_config_vars, cv, newvalue):
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| 121 | """Save modified and original unmodified value of configuration var"""
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| 122 |
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| 123 | oldvalue = _config_vars.get(cv, '')
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| 124 | if (oldvalue != newvalue) and (_INITPRE + cv not in _config_vars):
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| 125 | _config_vars[_INITPRE + cv] = oldvalue
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| 126 | _config_vars[cv] = newvalue
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| 127 |
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| 128 | def _supports_universal_builds():
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| 129 | """Returns True if universal builds are supported on this system"""
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| 130 | # As an approximation, we assume that if we are running on 10.4 or above,
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| 131 | # then we are running with an Xcode environment that supports universal
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| 132 | # builds, in particular -isysroot and -arch arguments to the compiler. This
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| 133 | # is in support of allowing 10.4 universal builds to run on 10.3.x systems.
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| 134 |
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| 135 | osx_version = _get_system_version()
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| 136 | if osx_version:
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| 137 | try:
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| 138 | osx_version = tuple(int(i) for i in osx_version.split('.'))
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| 139 | except ValueError:
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| 140 | osx_version = ''
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| 141 | return bool(osx_version >= (10, 4)) if osx_version else False
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| 142 |
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| 143 |
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| 144 | def _find_appropriate_compiler(_config_vars):
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| 145 | """Find appropriate C compiler for extension module builds"""
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| 146 |
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| 147 | # Issue #13590:
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| 148 | # The OSX location for the compiler varies between OSX
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| 149 | # (or rather Xcode) releases. With older releases (up-to 10.5)
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| 150 | # the compiler is in /usr/bin, with newer releases the compiler
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| 151 | # can only be found inside Xcode.app if the "Command Line Tools"
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| 152 | # are not installed.
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| 153 | #
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| 154 | # Futhermore, the compiler that can be used varies between
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| 155 | # Xcode releases. Up to Xcode 4 it was possible to use 'gcc-4.2'
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| 156 | # as the compiler, after that 'clang' should be used because
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| 157 | # gcc-4.2 is either not present, or a copy of 'llvm-gcc' that
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| 158 | # miscompiles Python.
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| 159 |
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| 160 | # skip checks if the compiler was overriden with a CC env variable
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| 161 | if 'CC' in os.environ:
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| 162 | return _config_vars
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| 163 |
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| 164 | # The CC config var might contain additional arguments.
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| 165 | # Ignore them while searching.
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| 166 | cc = oldcc = _config_vars['CC'].split()[0]
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| 167 | if not _find_executable(cc):
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| 168 | # Compiler is not found on the shell search PATH.
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| 169 | # Now search for clang, first on PATH (if the Command LIne
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| 170 | # Tools have been installed in / or if the user has provided
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| 171 | # another location via CC). If not found, try using xcrun
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| 172 | # to find an uninstalled clang (within a selected Xcode).
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| 173 |
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| 174 | # NOTE: Cannot use subprocess here because of bootstrap
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| 175 | # issues when building Python itself (and os.popen is
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| 176 | # implemented on top of subprocess and is therefore not
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| 177 | # usable as well)
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| 178 |
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| 179 | cc = _find_build_tool('clang')
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| 180 |
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| 181 | elif os.path.basename(cc).startswith('gcc'):
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| 182 | # Compiler is GCC, check if it is LLVM-GCC
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| 183 | data = _read_output("'%s' --version"
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| 184 | % (cc.replace("'", "'\"'\"'"),))
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| 185 | if 'llvm-gcc' in data:
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| 186 | # Found LLVM-GCC, fall back to clang
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| 187 | cc = _find_build_tool('clang')
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| 188 |
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| 189 | if not cc:
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| 190 | raise SystemError(
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| 191 | "Cannot locate working compiler")
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| 192 |
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| 193 | if cc != oldcc:
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| 194 | # Found a replacement compiler.
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| 195 | # Modify config vars using new compiler, if not already explicitly
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| 196 | # overriden by an env variable, preserving additional arguments.
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| 197 | for cv in _COMPILER_CONFIG_VARS:
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| 198 | if cv in _config_vars and cv not in os.environ:
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| 199 | cv_split = _config_vars[cv].split()
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| 200 | cv_split[0] = cc if cv != 'CXX' else cc + '++'
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| 201 | _save_modified_value(_config_vars, cv, ' '.join(cv_split))
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| 202 |
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| 203 | return _config_vars
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| 204 |
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| 205 |
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| 206 | def _remove_universal_flags(_config_vars):
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| 207 | """Remove all universal build arguments from config vars"""
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| 208 |
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| 209 | for cv in _UNIVERSAL_CONFIG_VARS:
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| 210 | # Do not alter a config var explicitly overriden by env var
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| 211 | if cv in _config_vars and cv not in os.environ:
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| 212 | flags = _config_vars[cv]
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| 213 | flags = re.sub('-arch\s+\w+\s', ' ', flags)
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| 214 | flags = re.sub('-isysroot [^ \t]*', ' ', flags)
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| 215 | _save_modified_value(_config_vars, cv, flags)
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| 216 |
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| 217 | return _config_vars
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| 218 |
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| 219 |
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| 220 | def _remove_unsupported_archs(_config_vars):
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| 221 | """Remove any unsupported archs from config vars"""
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| 222 | # Different Xcode releases support different sets for '-arch'
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| 223 | # flags. In particular, Xcode 4.x no longer supports the
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| 224 | # PPC architectures.
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| 225 | #
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| 226 | # This code automatically removes '-arch ppc' and '-arch ppc64'
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| 227 | # when these are not supported. That makes it possible to
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| 228 | # build extensions on OSX 10.7 and later with the prebuilt
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| 229 | # 32-bit installer on the python.org website.
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| 230 |
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| 231 | # skip checks if the compiler was overriden with a CC env variable
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| 232 | if 'CC' in os.environ:
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| 233 | return _config_vars
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| 234 |
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| 235 | if re.search('-arch\s+ppc', _config_vars['CFLAGS']) is not None:
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| 236 | # NOTE: Cannot use subprocess here because of bootstrap
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| 237 | # issues when building Python itself
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| 238 | status = os.system(
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| 239 | """echo 'int main{};' | """
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| 240 | """'%s' -c -arch ppc -x c -o /dev/null /dev/null 2>/dev/null"""
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| 241 | %(_config_vars['CC'].replace("'", "'\"'\"'"),))
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| 242 | if status:
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| 243 | # The compile failed for some reason. Because of differences
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| 244 | # across Xcode and compiler versions, there is no reliable way
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| 245 | # to be sure why it failed. Assume here it was due to lack of
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| 246 | # PPC support and remove the related '-arch' flags from each
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| 247 | # config variables not explicitly overriden by an environment
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| 248 | # variable. If the error was for some other reason, we hope the
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| 249 | # failure will show up again when trying to compile an extension
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| 250 | # module.
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| 251 | for cv in _UNIVERSAL_CONFIG_VARS:
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| 252 | if cv in _config_vars and cv not in os.environ:
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| 253 | flags = _config_vars[cv]
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| 254 | flags = re.sub('-arch\s+ppc\w*\s', ' ', flags)
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| 255 | _save_modified_value(_config_vars, cv, flags)
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| 256 |
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| 257 | return _config_vars
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| 258 |
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| 259 |
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| 260 | def _override_all_archs(_config_vars):
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| 261 | """Allow override of all archs with ARCHFLAGS env var"""
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| 262 | # NOTE: This name was introduced by Apple in OSX 10.5 and
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| 263 | # is used by several scripting languages distributed with
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| 264 | # that OS release.
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| 265 | if 'ARCHFLAGS' in os.environ:
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| 266 | arch = os.environ['ARCHFLAGS']
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| 267 | for cv in _UNIVERSAL_CONFIG_VARS:
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| 268 | if cv in _config_vars and '-arch' in _config_vars[cv]:
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| 269 | flags = _config_vars[cv]
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| 270 | flags = re.sub('-arch\s+\w+\s', ' ', flags)
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| 271 | flags = flags + ' ' + arch
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| 272 | _save_modified_value(_config_vars, cv, flags)
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| 273 |
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| 274 | return _config_vars
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| 275 |
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| 276 |
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| 277 | def _check_for_unavailable_sdk(_config_vars):
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| 278 | """Remove references to any SDKs not available"""
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| 279 | # If we're on OSX 10.5 or later and the user tries to
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| 280 | # compile an extension using an SDK that is not present
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| 281 | # on the current machine it is better to not use an SDK
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| 282 | # than to fail. This is particularly important with
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| 283 | # the standalone Command Line Tools alternative to a
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| 284 | # full-blown Xcode install since the CLT packages do not
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| 285 | # provide SDKs. If the SDK is not present, it is assumed
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| 286 | # that the header files and dev libs have been installed
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| 287 | # to /usr and /System/Library by either a standalone CLT
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| 288 | # package or the CLT component within Xcode.
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| 289 | cflags = _config_vars.get('CFLAGS', '')
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| 290 | m = re.search(r'-isysroot\s+(\S+)', cflags)
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| 291 | if m is not None:
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| 292 | sdk = m.group(1)
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| 293 | if not os.path.exists(sdk):
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| 294 | for cv in _UNIVERSAL_CONFIG_VARS:
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| 295 | # Do not alter a config var explicitly overriden by env var
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| 296 | if cv in _config_vars and cv not in os.environ:
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| 297 | flags = _config_vars[cv]
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| 298 | flags = re.sub(r'-isysroot\s+\S+(?:\s|$)', ' ', flags)
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| 299 | _save_modified_value(_config_vars, cv, flags)
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| 300 |
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| 301 | return _config_vars
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| 302 |
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| 303 |
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| 304 | def compiler_fixup(compiler_so, cc_args):
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| 305 | """
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| 306 | This function will strip '-isysroot PATH' and '-arch ARCH' from the
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| 307 | compile flags if the user has specified one them in extra_compile_flags.
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| 308 |
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| 309 | This is needed because '-arch ARCH' adds another architecture to the
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| 310 | build, without a way to remove an architecture. Furthermore GCC will
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| 311 | barf if multiple '-isysroot' arguments are present.
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| 312 | """
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| 313 | stripArch = stripSysroot = False
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| 314 |
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| 315 | compiler_so = list(compiler_so)
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| 316 |
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| 317 | if not _supports_universal_builds():
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| 318 | # OSX before 10.4.0, these don't support -arch and -isysroot at
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| 319 | # all.
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| 320 | stripArch = stripSysroot = True
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| 321 | else:
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| 322 | stripArch = '-arch' in cc_args
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| 323 | stripSysroot = '-isysroot' in cc_args
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| 324 |
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| 325 | if stripArch or 'ARCHFLAGS' in os.environ:
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| 326 | while True:
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| 327 | try:
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| 328 | index = compiler_so.index('-arch')
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| 329 | # Strip this argument and the next one:
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| 330 | del compiler_so[index:index+2]
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| 331 | except ValueError:
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| 332 | break
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| 333 |
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| 334 | if 'ARCHFLAGS' in os.environ and not stripArch:
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| 335 | # User specified different -arch flags in the environ,
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| 336 | # see also distutils.sysconfig
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| 337 | compiler_so = compiler_so + os.environ['ARCHFLAGS'].split()
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| 338 |
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| 339 | if stripSysroot:
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| 340 | while True:
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| 341 | try:
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| 342 | index = compiler_so.index('-isysroot')
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| 343 | # Strip this argument and the next one:
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| 344 | del compiler_so[index:index+2]
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| 345 | except ValueError:
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| 346 | break
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| 347 |
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| 348 | # Check if the SDK that is used during compilation actually exists,
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| 349 | # the universal build requires the usage of a universal SDK and not all
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| 350 | # users have that installed by default.
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| 351 | sysroot = None
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| 352 | if '-isysroot' in cc_args:
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| 353 | idx = cc_args.index('-isysroot')
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| 354 | sysroot = cc_args[idx+1]
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| 355 | elif '-isysroot' in compiler_so:
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| 356 | idx = compiler_so.index('-isysroot')
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| 357 | sysroot = compiler_so[idx+1]
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| 358 |
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| 359 | if sysroot and not os.path.isdir(sysroot):
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| 360 | from distutils import log
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| 361 | log.warn("Compiling with an SDK that doesn't seem to exist: %s",
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| 362 | sysroot)
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| 363 | log.warn("Please check your Xcode installation")
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| 364 |
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| 365 | return compiler_so
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| 366 |
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| 367 |
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| 368 | def customize_config_vars(_config_vars):
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| 369 | """Customize Python build configuration variables.
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| 370 |
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| 371 | Called internally from sysconfig with a mutable mapping
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| 372 | containing name/value pairs parsed from the configured
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| 373 | makefile used to build this interpreter. Returns
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| 374 | the mapping updated as needed to reflect the environment
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| 375 | in which the interpreter is running; in the case of
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| 376 | a Python from a binary installer, the installed
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| 377 | environment may be very different from the build
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| 378 | environment, i.e. different OS levels, different
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| 379 | built tools, different available CPU architectures.
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| 380 |
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| 381 | This customization is performed whenever
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| 382 | distutils.sysconfig.get_config_vars() is first
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| 383 | called. It may be used in environments where no
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| 384 | compilers are present, i.e. when installing pure
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| 385 | Python dists. Customization of compiler paths
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| 386 | and detection of unavailable archs is deferred
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| 387 | until the first extension module build is
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| 388 | requested (in distutils.sysconfig.customize_compiler).
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| 389 |
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| 390 | Currently called from distutils.sysconfig
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| 391 | """
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| 392 |
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| 393 | if not _supports_universal_builds():
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| 394 | # On Mac OS X before 10.4, check if -arch and -isysroot
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| 395 | # are in CFLAGS or LDFLAGS and remove them if they are.
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| 396 | # This is needed when building extensions on a 10.3 system
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| 397 | # using a universal build of python.
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| 398 | _remove_universal_flags(_config_vars)
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| 399 |
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| 400 | # Allow user to override all archs with ARCHFLAGS env var
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| 401 | _override_all_archs(_config_vars)
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| 402 |
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| 403 | # Remove references to sdks that are not found
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| 404 | _check_for_unavailable_sdk(_config_vars)
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| 405 |
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| 406 | return _config_vars
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| 407 |
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| 408 |
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| 409 | def customize_compiler(_config_vars):
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| 410 | """Customize compiler path and configuration variables.
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| 411 |
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| 412 | This customization is performed when the first
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| 413 | extension module build is requested
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| 414 | in distutils.sysconfig.customize_compiler).
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| 415 | """
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| 416 |
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| 417 | # Find a compiler to use for extension module builds
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| 418 | _find_appropriate_compiler(_config_vars)
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| 419 |
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| 420 | # Remove ppc arch flags if not supported here
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| 421 | _remove_unsupported_archs(_config_vars)
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| 422 |
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| 423 | # Allow user to override all archs with ARCHFLAGS env var
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| 424 | _override_all_archs(_config_vars)
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| 425 |
|
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| 426 | return _config_vars
|
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| 427 |
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| 428 |
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| 429 | def get_platform_osx(_config_vars, osname, release, machine):
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| 430 | """Filter values for get_platform()"""
|
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| 431 | # called from get_platform() in sysconfig and distutils.util
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| 432 | #
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|---|
| 433 | # For our purposes, we'll assume that the system version from
|
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| 434 | # distutils' perspective is what MACOSX_DEPLOYMENT_TARGET is set
|
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| 435 | # to. This makes the compatibility story a bit more sane because the
|
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| 436 | # machine is going to compile and link as if it were
|
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| 437 | # MACOSX_DEPLOYMENT_TARGET.
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| 438 |
|
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| 439 | macver = _config_vars.get('MACOSX_DEPLOYMENT_TARGET', '')
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| 440 | macrelease = _get_system_version() or macver
|
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| 441 | macver = macver or macrelease
|
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| 442 |
|
|---|
| 443 | if macver:
|
|---|
| 444 | release = macver
|
|---|
| 445 | osname = "macosx"
|
|---|
| 446 |
|
|---|
| 447 | # Use the original CFLAGS value, if available, so that we
|
|---|
| 448 | # return the same machine type for the platform string.
|
|---|
| 449 | # Otherwise, distutils may consider this a cross-compiling
|
|---|
| 450 | # case and disallow installs.
|
|---|
| 451 | cflags = _config_vars.get(_INITPRE+'CFLAGS',
|
|---|
| 452 | _config_vars.get('CFLAGS', ''))
|
|---|
| 453 | if ((macrelease + '.') >= '10.4.' and
|
|---|
| 454 | '-arch' in cflags.strip()):
|
|---|
| 455 | # The universal build will build fat binaries, but not on
|
|---|
| 456 | # systems before 10.4
|
|---|
| 457 |
|
|---|
| 458 | machine = 'fat'
|
|---|
| 459 |
|
|---|
| 460 | archs = re.findall('-arch\s+(\S+)', cflags)
|
|---|
| 461 | archs = tuple(sorted(set(archs)))
|
|---|
| 462 |
|
|---|
| 463 | if len(archs) == 1:
|
|---|
| 464 | machine = archs[0]
|
|---|
| 465 | elif archs == ('i386', 'ppc'):
|
|---|
| 466 | machine = 'fat'
|
|---|
| 467 | elif archs == ('i386', 'x86_64'):
|
|---|
| 468 | machine = 'intel'
|
|---|
| 469 | elif archs == ('i386', 'ppc', 'x86_64'):
|
|---|
| 470 | machine = 'fat3'
|
|---|
| 471 | elif archs == ('ppc64', 'x86_64'):
|
|---|
| 472 | machine = 'fat64'
|
|---|
| 473 | elif archs == ('i386', 'ppc', 'ppc64', 'x86_64'):
|
|---|
| 474 | machine = 'universal'
|
|---|
| 475 | else:
|
|---|
| 476 | raise ValueError(
|
|---|
| 477 | "Don't know machine value for archs=%r" % (archs,))
|
|---|
| 478 |
|
|---|
| 479 | elif machine == 'i386':
|
|---|
| 480 | # On OSX the machine type returned by uname is always the
|
|---|
| 481 | # 32-bit variant, even if the executable architecture is
|
|---|
| 482 | # the 64-bit variant
|
|---|
| 483 | if sys.maxint >= 2**32:
|
|---|
| 484 | machine = 'x86_64'
|
|---|
| 485 |
|
|---|
| 486 | elif machine in ('PowerPC', 'Power_Macintosh'):
|
|---|
| 487 | # Pick a sane name for the PPC architecture.
|
|---|
| 488 | # See 'i386' case
|
|---|
| 489 | if sys.maxint >= 2**32:
|
|---|
| 490 | machine = 'ppc64'
|
|---|
| 491 | else:
|
|---|
| 492 | machine = 'ppc'
|
|---|
| 493 |
|
|---|
| 494 | return (osname, release, machine)
|
|---|
