initial import of the packaging package in the standard library
diff --git a/Lib/packaging/compiler/__init__.py b/Lib/packaging/compiler/__init__.py
new file mode 100644
index 0000000..b25cc73
--- /dev/null
+++ b/Lib/packaging/compiler/__init__.py
@@ -0,0 +1,282 @@
+"""Compiler abstraction model used by packaging.
+
+An abstract base class is defined in the ccompiler submodule, and
+concrete implementations suitable for various platforms are defined in
+the other submodules. The extension module is also placed in this
+package.
+
+In general, code should not instantiate compiler classes directly but
+use the new_compiler and customize_compiler functions provided in this
+module.
+
+The compiler system has a registration API: get_default_compiler,
+set_compiler, show_compilers.
+"""
+
+import os
+import sys
+import re
+
+import sysconfig
+from packaging.util import resolve_name
+from packaging.errors import PackagingPlatformError
+
+
+def customize_compiler(compiler):
+ """Do any platform-specific customization of a CCompiler instance.
+
+ Mainly needed on Unix, so we can plug in the information that
+ varies across Unices and is stored in Python's Makefile.
+ """
+ if compiler.name == "unix":
+ cc, cxx, opt, cflags, ccshared, ldshared, so_ext, ar, ar_flags = (
+ sysconfig.get_config_vars('CC', 'CXX', 'OPT', 'CFLAGS',
+ 'CCSHARED', 'LDSHARED', 'SO', 'AR',
+ 'ARFLAGS'))
+
+ if 'CC' in os.environ:
+ cc = os.environ['CC']
+ if 'CXX' in os.environ:
+ cxx = os.environ['CXX']
+ if 'LDSHARED' in os.environ:
+ ldshared = os.environ['LDSHARED']
+ if 'CPP' in os.environ:
+ cpp = os.environ['CPP']
+ else:
+ cpp = cc + " -E" # not always
+ if 'LDFLAGS' in os.environ:
+ ldshared = ldshared + ' ' + os.environ['LDFLAGS']
+ if 'CFLAGS' in os.environ:
+ cflags = opt + ' ' + os.environ['CFLAGS']
+ ldshared = ldshared + ' ' + os.environ['CFLAGS']
+ if 'CPPFLAGS' in os.environ:
+ cpp = cpp + ' ' + os.environ['CPPFLAGS']
+ cflags = cflags + ' ' + os.environ['CPPFLAGS']
+ ldshared = ldshared + ' ' + os.environ['CPPFLAGS']
+ if 'AR' in os.environ:
+ ar = os.environ['AR']
+ if 'ARFLAGS' in os.environ:
+ archiver = ar + ' ' + os.environ['ARFLAGS']
+ else:
+ if ar_flags is not None:
+ archiver = ar + ' ' + ar_flags
+ else:
+ # see if its the proper default value
+ # mmm I don't want to backport the makefile
+ archiver = ar + ' rc'
+
+ cc_cmd = cc + ' ' + cflags
+ compiler.set_executables(
+ preprocessor=cpp,
+ compiler=cc_cmd,
+ compiler_so=cc_cmd + ' ' + ccshared,
+ compiler_cxx=cxx,
+ linker_so=ldshared,
+ linker_exe=cc,
+ archiver=archiver)
+
+ compiler.shared_lib_extension = so_ext
+
+
+# Map a sys.platform/os.name ('posix', 'nt') to the default compiler
+# type for that platform. Keys are interpreted as re match
+# patterns. Order is important; platform mappings are preferred over
+# OS names.
+_default_compilers = (
+
+ # Platform string mappings
+
+ # on a cygwin built python we can use gcc like an ordinary UNIXish
+ # compiler
+ ('cygwin.*', 'unix'),
+ ('os2emx', 'emx'),
+
+ # OS name mappings
+ ('posix', 'unix'),
+ ('nt', 'msvc'),
+
+ )
+
+def get_default_compiler(osname=None, platform=None):
+ """ Determine the default compiler to use for the given platform.
+
+ osname should be one of the standard Python OS names (i.e. the
+ ones returned by os.name) and platform the common value
+ returned by sys.platform for the platform in question.
+
+ The default values are os.name and sys.platform in case the
+ parameters are not given.
+
+ """
+ if osname is None:
+ osname = os.name
+ if platform is None:
+ platform = sys.platform
+ for pattern, compiler in _default_compilers:
+ if re.match(pattern, platform) is not None or \
+ re.match(pattern, osname) is not None:
+ return compiler
+ # Defaults to Unix compiler
+ return 'unix'
+
+
+# compiler mapping
+# XXX useful to expose them? (i.e. get_compiler_names)
+_COMPILERS = {
+ 'unix': 'packaging.compiler.unixccompiler.UnixCCompiler',
+ 'msvc': 'packaging.compiler.msvccompiler.MSVCCompiler',
+ 'cygwin': 'packaging.compiler.cygwinccompiler.CygwinCCompiler',
+ 'mingw32': 'packaging.compiler.cygwinccompiler.Mingw32CCompiler',
+ 'bcpp': 'packaging.compiler.bcppcompiler.BCPPCompiler',
+}
+
+def set_compiler(location):
+ """Add or change a compiler"""
+ cls = resolve_name(location)
+ # XXX we want to check the class here
+ _COMPILERS[cls.name] = cls
+
+
+def show_compilers():
+ """Print list of available compilers (used by the "--help-compiler"
+ options to "build", "build_ext", "build_clib").
+ """
+ from packaging.fancy_getopt import FancyGetopt
+ compilers = []
+
+ for name, cls in _COMPILERS.items():
+ if isinstance(cls, str):
+ cls = resolve_name(cls)
+ _COMPILERS[name] = cls
+
+ compilers.append(("compiler=" + name, None, cls.description))
+
+ compilers.sort()
+ pretty_printer = FancyGetopt(compilers)
+ pretty_printer.print_help("List of available compilers:")
+
+
+def new_compiler(plat=None, compiler=None, verbose=0, dry_run=False,
+ force=False):
+ """Generate an instance of some CCompiler subclass for the supplied
+ platform/compiler combination. 'plat' defaults to 'os.name'
+ (eg. 'posix', 'nt'), and 'compiler' defaults to the default compiler
+ for that platform. Currently only 'posix' and 'nt' are supported, and
+ the default compilers are "traditional Unix interface" (UnixCCompiler
+ class) and Visual C++ (MSVCCompiler class). Note that it's perfectly
+ possible to ask for a Unix compiler object under Windows, and a
+ Microsoft compiler object under Unix -- if you supply a value for
+ 'compiler', 'plat' is ignored.
+ """
+ if plat is None:
+ plat = os.name
+
+ try:
+ if compiler is None:
+ compiler = get_default_compiler(plat)
+
+ cls = _COMPILERS[compiler]
+ except KeyError:
+ msg = "don't know how to compile C/C++ code on platform '%s'" % plat
+ if compiler is not None:
+ msg = msg + " with '%s' compiler" % compiler
+ raise PackagingPlatformError(msg)
+
+ if isinstance(cls, str):
+ cls = resolve_name(cls)
+ _COMPILERS[compiler] = cls
+
+
+ # XXX The None is necessary to preserve backwards compatibility
+ # with classes that expect verbose to be the first positional
+ # argument.
+ return cls(None, dry_run, force)
+
+
+def gen_preprocess_options(macros, include_dirs):
+ """Generate C pre-processor options (-D, -U, -I) as used by at least
+ two types of compilers: the typical Unix compiler and Visual C++.
+ 'macros' is the usual thing, a list of 1- or 2-tuples, where (name,)
+ means undefine (-U) macro 'name', and (name,value) means define (-D)
+ macro 'name' to 'value'. 'include_dirs' is just a list of directory
+ names to be added to the header file search path (-I). Returns a list
+ of command-line options suitable for either Unix compilers or Visual
+ C++.
+ """
+ # XXX it would be nice (mainly aesthetic, and so we don't generate
+ # stupid-looking command lines) to go over 'macros' and eliminate
+ # redundant definitions/undefinitions (ie. ensure that only the
+ # latest mention of a particular macro winds up on the command
+ # line). I don't think it's essential, though, since most (all?)
+ # Unix C compilers only pay attention to the latest -D or -U
+ # mention of a macro on their command line. Similar situation for
+ # 'include_dirs'. I'm punting on both for now. Anyways, weeding out
+ # redundancies like this should probably be the province of
+ # CCompiler, since the data structures used are inherited from it
+ # and therefore common to all CCompiler classes.
+
+ pp_opts = []
+ for macro in macros:
+
+ if not isinstance(macro, tuple) and 1 <= len(macro) <= 2:
+ raise TypeError(
+ "bad macro definition '%s': each element of 'macros'"
+ "list must be a 1- or 2-tuple" % macro)
+
+ if len(macro) == 1: # undefine this macro
+ pp_opts.append("-U%s" % macro[0])
+ elif len(macro) == 2:
+ if macro[1] is None: # define with no explicit value
+ pp_opts.append("-D%s" % macro[0])
+ else:
+ # XXX *don't* need to be clever about quoting the
+ # macro value here, because we're going to avoid the
+ # shell at all costs when we spawn the command!
+ pp_opts.append("-D%s=%s" % macro)
+
+ for dir in include_dirs:
+ pp_opts.append("-I%s" % dir)
+
+ return pp_opts
+
+
+def gen_lib_options(compiler, library_dirs, runtime_library_dirs, libraries):
+ """Generate linker options for searching library directories and
+ linking with specific libraries.
+
+ 'libraries' and 'library_dirs' are, respectively, lists of library names
+ (not filenames!) and search directories. Returns a list of command-line
+ options suitable for use with some compiler (depending on the two format
+ strings passed in).
+ """
+ lib_opts = []
+
+ for dir in library_dirs:
+ lib_opts.append(compiler.library_dir_option(dir))
+
+ for dir in runtime_library_dirs:
+ opt = compiler.runtime_library_dir_option(dir)
+ if isinstance(opt, list):
+ lib_opts.extend(opt)
+ else:
+ lib_opts.append(opt)
+
+ # XXX it's important that we *not* remove redundant library mentions!
+ # sometimes you really do have to say "-lfoo -lbar -lfoo" in order to
+ # resolve all symbols. I just hope we never have to say "-lfoo obj.o
+ # -lbar" to get things to work -- that's certainly a possibility, but a
+ # pretty nasty way to arrange your C code.
+
+ for lib in libraries:
+ lib_dir, lib_name = os.path.split(lib)
+ if lib_dir != '':
+ lib_file = compiler.find_library_file([lib_dir], lib_name)
+ if lib_file is not None:
+ lib_opts.append(lib_file)
+ else:
+ compiler.warn("no library file corresponding to "
+ "'%s' found (skipping)" % lib)
+ else:
+ lib_opts.append(compiler.library_option(lib))
+
+ return lib_opts