Update 2025-04-24_11:44:19
This commit is contained in:
oib
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"""distutils.unixccompiler
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Contains the UnixCCompiler class, a subclass of CCompiler that handles
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the "typical" Unix-style command-line C compiler:
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* macros defined with -Dname[=value]
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* macros undefined with -Uname
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* include search directories specified with -Idir
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* libraries specified with -lllib
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* library search directories specified with -Ldir
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* compile handled by 'cc' (or similar) executable with -c option:
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compiles .c to .o
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* link static library handled by 'ar' command (possibly with 'ranlib')
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* link shared library handled by 'cc -shared'
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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 shlex
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import itertools
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from . import sysconfig
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from .dep_util import newer
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from .ccompiler import CCompiler, gen_preprocess_options, gen_lib_options
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from .errors import DistutilsExecError, CompileError, LibError, LinkError
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from ._log import log
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from ._macos_compat import compiler_fixup
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# XXX Things not currently handled:
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# * optimization/debug/warning flags; we just use whatever's in Python's
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# Makefile and live with it. Is this adequate? If not, we might
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# have to have a bunch of subclasses GNUCCompiler, SGICCompiler,
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# SunCCompiler, and I suspect down that road lies madness.
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# * even if we don't know a warning flag from an optimization flag,
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# we need some way for outsiders to feed preprocessor/compiler/linker
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# flags in to us -- eg. a sysadmin might want to mandate certain flags
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# via a site config file, or a user might want to set something for
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# compiling this module distribution only via the setup.py command
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# line, whatever. As long as these options come from something on the
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# current system, they can be as system-dependent as they like, and we
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# should just happily stuff them into the preprocessor/compiler/linker
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# options and carry on.
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def _split_env(cmd):
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"""
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For macOS, split command into 'env' portion (if any)
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and the rest of the linker command.
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>>> _split_env(['a', 'b', 'c'])
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([], ['a', 'b', 'c'])
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>>> _split_env(['/usr/bin/env', 'A=3', 'gcc'])
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(['/usr/bin/env', 'A=3'], ['gcc'])
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"""
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pivot = 0
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if os.path.basename(cmd[0]) == "env":
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pivot = 1
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while '=' in cmd[pivot]:
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pivot += 1
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return cmd[:pivot], cmd[pivot:]
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def _split_aix(cmd):
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"""
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AIX platforms prefix the compiler with the ld_so_aix
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script, so split that from the linker command.
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>>> _split_aix(['a', 'b', 'c'])
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([], ['a', 'b', 'c'])
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>>> _split_aix(['/bin/foo/ld_so_aix', 'gcc'])
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(['/bin/foo/ld_so_aix'], ['gcc'])
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"""
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pivot = os.path.basename(cmd[0]) == 'ld_so_aix'
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return cmd[:pivot], cmd[pivot:]
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def _linker_params(linker_cmd, compiler_cmd):
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"""
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The linker command usually begins with the compiler
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command (possibly multiple elements), followed by zero or more
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params for shared library building.
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If the LDSHARED env variable overrides the linker command,
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however, the commands may not match.
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Return the best guess of the linker parameters by stripping
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the linker command. If the compiler command does not
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match the linker command, assume the linker command is
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just the first element.
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>>> _linker_params('gcc foo bar'.split(), ['gcc'])
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['foo', 'bar']
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>>> _linker_params('gcc foo bar'.split(), ['other'])
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['foo', 'bar']
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>>> _linker_params('ccache gcc foo bar'.split(), 'ccache gcc'.split())
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['foo', 'bar']
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>>> _linker_params(['gcc'], ['gcc'])
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[]
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"""
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c_len = len(compiler_cmd)
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pivot = c_len if linker_cmd[:c_len] == compiler_cmd else 1
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return linker_cmd[pivot:]
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class UnixCCompiler(CCompiler):
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compiler_type = 'unix'
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# These are used by CCompiler in two places: the constructor sets
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# instance attributes 'preprocessor', 'compiler', etc. from them, and
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# 'set_executable()' allows any of these to be set. The defaults here
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# are pretty generic; they will probably have to be set by an outsider
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# (eg. using information discovered by the sysconfig about building
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# Python extensions).
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executables = {
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'preprocessor': None,
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'compiler': ["cc"],
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'compiler_so': ["cc"],
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'compiler_cxx': ["cc"],
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'linker_so': ["cc", "-shared"],
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'linker_exe': ["cc"],
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'archiver': ["ar", "-cr"],
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'ranlib': None,
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}
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if sys.platform[:6] == "darwin":
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executables['ranlib'] = ["ranlib"]
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# Needed for the filename generation methods provided by the base
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# class, CCompiler. NB. whoever instantiates/uses a particular
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# UnixCCompiler instance should set 'shared_lib_ext' -- we set a
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# reasonable common default here, but it's not necessarily used on all
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# Unices!
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src_extensions = [".c", ".C", ".cc", ".cxx", ".cpp", ".m"]
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obj_extension = ".o"
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static_lib_extension = ".a"
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shared_lib_extension = ".so"
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dylib_lib_extension = ".dylib"
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xcode_stub_lib_extension = ".tbd"
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static_lib_format = shared_lib_format = dylib_lib_format = "lib%s%s"
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xcode_stub_lib_format = dylib_lib_format
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if sys.platform == "cygwin":
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exe_extension = ".exe"
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def preprocess(
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self,
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source,
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output_file=None,
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macros=None,
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include_dirs=None,
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extra_preargs=None,
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extra_postargs=None,
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):
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fixed_args = self._fix_compile_args(None, macros, include_dirs)
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ignore, macros, include_dirs = fixed_args
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pp_opts = gen_preprocess_options(macros, include_dirs)
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pp_args = self.preprocessor + pp_opts
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if output_file:
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pp_args.extend(['-o', output_file])
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if extra_preargs:
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pp_args[:0] = extra_preargs
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if extra_postargs:
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pp_args.extend(extra_postargs)
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pp_args.append(source)
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# reasons to preprocess:
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# - force is indicated
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# - output is directed to stdout
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# - source file is newer than the target
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preprocess = self.force or output_file is None or newer(source, output_file)
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if not preprocess:
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return
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if output_file:
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self.mkpath(os.path.dirname(output_file))
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try:
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self.spawn(pp_args)
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except DistutilsExecError as msg:
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raise CompileError(msg)
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def _compile(self, obj, src, ext, cc_args, extra_postargs, pp_opts):
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compiler_so = compiler_fixup(self.compiler_so, cc_args + extra_postargs)
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try:
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self.spawn(compiler_so + cc_args + [src, '-o', obj] + extra_postargs)
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except DistutilsExecError as msg:
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raise CompileError(msg)
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def create_static_lib(
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self, objects, output_libname, output_dir=None, debug=0, target_lang=None
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):
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objects, output_dir = self._fix_object_args(objects, output_dir)
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output_filename = self.library_filename(output_libname, output_dir=output_dir)
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if self._need_link(objects, output_filename):
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self.mkpath(os.path.dirname(output_filename))
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self.spawn(self.archiver + [output_filename] + objects + self.objects)
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# Not many Unices required ranlib anymore -- SunOS 4.x is, I
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# think the only major Unix that does. Maybe we need some
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# platform intelligence here to skip ranlib if it's not
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# needed -- or maybe Python's configure script took care of
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# it for us, hence the check for leading colon.
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if self.ranlib:
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try:
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self.spawn(self.ranlib + [output_filename])
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except DistutilsExecError as msg:
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raise LibError(msg)
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else:
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log.debug("skipping %s (up-to-date)", output_filename)
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def link(
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self,
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target_desc,
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objects,
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output_filename,
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output_dir=None,
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libraries=None,
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library_dirs=None,
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runtime_library_dirs=None,
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export_symbols=None,
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debug=0,
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extra_preargs=None,
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extra_postargs=None,
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build_temp=None,
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target_lang=None,
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):
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objects, output_dir = self._fix_object_args(objects, output_dir)
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fixed_args = self._fix_lib_args(libraries, library_dirs, runtime_library_dirs)
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libraries, library_dirs, runtime_library_dirs = fixed_args
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lib_opts = gen_lib_options(self, library_dirs, runtime_library_dirs, libraries)
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if not isinstance(output_dir, (str, type(None))):
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raise TypeError("'output_dir' must be a string or None")
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if output_dir is not None:
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output_filename = os.path.join(output_dir, output_filename)
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if self._need_link(objects, output_filename):
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ld_args = objects + self.objects + lib_opts + ['-o', output_filename]
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if debug:
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ld_args[:0] = ['-g']
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if extra_preargs:
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ld_args[:0] = extra_preargs
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if extra_postargs:
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ld_args.extend(extra_postargs)
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self.mkpath(os.path.dirname(output_filename))
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try:
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# Select a linker based on context: linker_exe when
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# building an executable or linker_so (with shared options)
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# when building a shared library.
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building_exe = target_desc == CCompiler.EXECUTABLE
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linker = (self.linker_exe if building_exe else self.linker_so)[:]
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if target_lang == "c++" and self.compiler_cxx:
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env, linker_ne = _split_env(linker)
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aix, linker_na = _split_aix(linker_ne)
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_, compiler_cxx_ne = _split_env(self.compiler_cxx)
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_, linker_exe_ne = _split_env(self.linker_exe)
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params = _linker_params(linker_na, linker_exe_ne)
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linker = env + aix + compiler_cxx_ne + params
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linker = compiler_fixup(linker, ld_args)
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self.spawn(linker + ld_args)
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except DistutilsExecError as msg:
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raise LinkError(msg)
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else:
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log.debug("skipping %s (up-to-date)", output_filename)
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# -- Miscellaneous methods -----------------------------------------
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# These are all used by the 'gen_lib_options() function, in
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# ccompiler.py.
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def library_dir_option(self, dir):
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return "-L" + dir
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def _is_gcc(self):
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cc_var = sysconfig.get_config_var("CC")
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compiler = os.path.basename(shlex.split(cc_var)[0])
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return "gcc" in compiler or "g++" in compiler
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def runtime_library_dir_option(self, dir):
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# XXX Hackish, at the very least. See Python bug #445902:
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# http://sourceforge.net/tracker/index.php
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# ?func=detail&aid=445902&group_id=5470&atid=105470
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# Linkers on different platforms need different options to
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# specify that directories need to be added to the list of
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# directories searched for dependencies when a dynamic library
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# is sought. GCC on GNU systems (Linux, FreeBSD, ...) has to
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# be told to pass the -R option through to the linker, whereas
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# other compilers and gcc on other systems just know this.
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# Other compilers may need something slightly different. At
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# this time, there's no way to determine this information from
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# the configuration data stored in the Python installation, so
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# we use this hack.
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if sys.platform[:6] == "darwin":
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from distutils.util import get_macosx_target_ver, split_version
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macosx_target_ver = get_macosx_target_ver()
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if macosx_target_ver and split_version(macosx_target_ver) >= [10, 5]:
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return "-Wl,-rpath," + dir
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else: # no support for -rpath on earlier macOS versions
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return "-L" + dir
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elif sys.platform[:7] == "freebsd":
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return "-Wl,-rpath=" + dir
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elif sys.platform[:5] == "hp-ux":
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return [
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"-Wl,+s" if self._is_gcc() else "+s",
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"-L" + dir,
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]
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# For all compilers, `-Wl` is the presumed way to
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# pass a compiler option to the linker and `-R` is
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# the way to pass an RPATH.
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if sysconfig.get_config_var("GNULD") == "yes":
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# GNU ld needs an extra option to get a RUNPATH
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# instead of just an RPATH.
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return "-Wl,--enable-new-dtags,-R" + dir
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else:
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return "-Wl,-R" + dir
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def library_option(self, lib):
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return "-l" + lib
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@staticmethod
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def _library_root(dir):
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"""
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macOS users can specify an alternate SDK using'-isysroot'.
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Calculate the SDK root if it is specified.
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Note that, as of Xcode 7, Apple SDKs may contain textual stub
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libraries with .tbd extensions rather than the normal .dylib
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shared libraries installed in /. The Apple compiler tool
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chain handles this transparently but it can cause problems
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for programs that are being built with an SDK and searching
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for specific libraries. Callers of find_library_file need to
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keep in mind that the base filename of the returned SDK library
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file might have a different extension from that of the library
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file installed on the running system, for example:
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/Applications/Xcode.app/Contents/Developer/Platforms/
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MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk/
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usr/lib/libedit.tbd
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vs
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/usr/lib/libedit.dylib
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"""
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cflags = sysconfig.get_config_var('CFLAGS')
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match = re.search(r'-isysroot\s*(\S+)', cflags)
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apply_root = (
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sys.platform == 'darwin'
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and match
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and (
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dir.startswith('/System/')
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or (dir.startswith('/usr/') and not dir.startswith('/usr/local/'))
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)
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)
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return os.path.join(match.group(1), dir[1:]) if apply_root else dir
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def find_library_file(self, dirs, lib, debug=0):
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r"""
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Second-guess the linker with not much hard
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data to go on: GCC seems to prefer the shared library, so
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assume that *all* Unix C compilers do,
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ignoring even GCC's "-static" option.
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>>> compiler = UnixCCompiler()
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>>> compiler._library_root = lambda dir: dir
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>>> monkeypatch = getfixture('monkeypatch')
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>>> monkeypatch.setattr(os.path, 'exists', lambda d: 'existing' in d)
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>>> dirs = ('/foo/bar/missing', '/foo/bar/existing')
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>>> compiler.find_library_file(dirs, 'abc').replace('\\', '/')
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'/foo/bar/existing/libabc.dylib'
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>>> compiler.find_library_file(reversed(dirs), 'abc').replace('\\', '/')
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'/foo/bar/existing/libabc.dylib'
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>>> monkeypatch.setattr(os.path, 'exists',
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... lambda d: 'existing' in d and '.a' in d)
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>>> compiler.find_library_file(dirs, 'abc').replace('\\', '/')
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'/foo/bar/existing/libabc.a'
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>>> compiler.find_library_file(reversed(dirs), 'abc').replace('\\', '/')
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'/foo/bar/existing/libabc.a'
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"""
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lib_names = (
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self.library_filename(lib, lib_type=type)
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for type in 'dylib xcode_stub shared static'.split()
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)
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roots = map(self._library_root, dirs)
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searched = (
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os.path.join(root, lib_name)
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for root, lib_name in itertools.product(roots, lib_names)
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)
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found = filter(os.path.exists, searched)
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# Return None if it could not be found in any dir.
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return next(found, None)
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