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