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cpython/Lib/distutils/unixccompiler.py
Christian Heimes ef6196028f
bpo-45371: Fix distutils' rpath support for clang (GH-28732) 
Signed-off-by: Christian Heimes <christian@python.org>
2021-10-05 02:43:46 -07:00

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"""distutils.unixccompiler
Contains the UnixCCompiler class, a subclass of CCompiler that handles
the "typical" Unix-style command-line C compiler:
* macros defined with -Dname[=value]
* macros undefined with -Uname
* include search directories specified with -Idir
* libraries specified with -lllib
* library search directories specified with -Ldir
* compile handled by 'cc' (or similar) executable with -c option:
compiles .c to .o
* link static library handled by 'ar' command (possibly with 'ranlib')
* link shared library handled by 'cc -shared'
"""
import os, sys, re
from distutils import sysconfig
from distutils.dep_util import newer
from distutils.ccompiler import \
CCompiler, gen_preprocess_options, gen_lib_options
from distutils.errors import \
DistutilsExecError, CompileError, LibError, LinkError
from distutils import log
if sys.platform == 'darwin':
import _osx_support
# XXX Things not currently handled:
# * optimization/debug/warning flags; we just use whatever's in Python's
# Makefile and live with it. Is this adequate? If not, we might
# have to have a bunch of subclasses GNUCCompiler, SGICCompiler,
# SunCCompiler, and I suspect down that road lies madness.
# * even if we don't know a warning flag from an optimization flag,
# we need some way for outsiders to feed preprocessor/compiler/linker
# flags in to us -- eg. a sysadmin might want to mandate certain flags
# via a site config file, or a user might want to set something for
# compiling this module distribution only via the setup.py command
# line, whatever. As long as these options come from something on the
# current system, they can be as system-dependent as they like, and we
# should just happily stuff them into the preprocessor/compiler/linker
# options and carry on.
class UnixCCompiler(CCompiler):
compiler_type = 'unix'
# These are used by CCompiler in two places: the constructor sets
# instance attributes 'preprocessor', 'compiler', etc. from them, and
# 'set_executable()' allows any of these to be set. The defaults here
# are pretty generic; they will probably have to be set by an outsider
# (eg. using information discovered by the sysconfig about building
# Python extensions).
executables = {'preprocessor' : None,
'compiler' : ["cc"],
'compiler_so' : ["cc"],
'compiler_cxx' : ["cc"],
'linker_so' : ["cc", "-shared"],
'linker_exe' : ["cc"],
'archiver' : ["ar", "-cr"],
'ranlib' : None,
}
if sys.platform[:6] == "darwin":
executables['ranlib'] = ["ranlib"]
# Needed for the filename generation methods provided by the base
# class, CCompiler. NB. whoever instantiates/uses a particular
# UnixCCompiler instance should set 'shared_lib_ext' -- we set a
# reasonable common default here, but it's not necessarily used on all
# Unices!
src_extensions = [".c",".C",".cc",".cxx",".cpp",".m"]
obj_extension = ".o"
static_lib_extension = ".a"
shared_lib_extension = ".so"
dylib_lib_extension = ".dylib"
xcode_stub_lib_extension = ".tbd"
static_lib_format = shared_lib_format = dylib_lib_format = "lib%s%s"
xcode_stub_lib_format = dylib_lib_format
if sys.platform == "cygwin":
exe_extension = ".exe"
def preprocess(self, source, output_file=None, macros=None,
include_dirs=None, extra_preargs=None, extra_postargs=None):
fixed_args = self._fix_compile_args(None, macros, include_dirs)
ignore, macros, include_dirs = fixed_args
pp_opts = gen_preprocess_options(macros, include_dirs)
pp_args = self.preprocessor + pp_opts
if output_file:
pp_args.extend(['-o', output_file])
if extra_preargs:
pp_args[:0] = extra_preargs
if extra_postargs:
pp_args.extend(extra_postargs)
pp_args.append(source)
# We need to preprocess: either we're being forced to, or we're
# generating output to stdout, or there's a target output file and
# the source file is newer than the target (or the target doesn't
# exist).
if self.force or output_file is None or newer(source, output_file):
if output_file:
self.mkpath(os.path.dirname(output_file))
try:
self.spawn(pp_args)
except DistutilsExecError as msg:
raise CompileError(msg)
def _compile(self, obj, src, ext, cc_args, extra_postargs, pp_opts):
compiler_so = self.compiler_so
if sys.platform == 'darwin':
compiler_so = _osx_support.compiler_fixup(compiler_so,
cc_args + extra_postargs)
try:
self.spawn(compiler_so + cc_args + [src, '-o', obj] +
extra_postargs)
except DistutilsExecError as msg:
raise CompileError(msg)
def create_static_lib(self, objects, output_libname,
output_dir=None, debug=0, target_lang=None):
objects, output_dir = self._fix_object_args(objects, output_dir)
output_filename = \
self.library_filename(output_libname, output_dir=output_dir)
if self._need_link(objects, output_filename):
self.mkpath(os.path.dirname(output_filename))
self.spawn(self.archiver +
[output_filename] +
objects + self.objects)
# Not many Unices required ranlib anymore -- SunOS 4.x is, I
# think the only major Unix that does. Maybe we need some
# platform intelligence here to skip ranlib if it's not
# needed -- or maybe Python's configure script took care of
# it for us, hence the check for leading colon.
if self.ranlib:
try:
self.spawn(self.ranlib + [output_filename])
except DistutilsExecError as msg:
raise LibError(msg)
else:
log.debug("skipping %s (up-to-date)", output_filename)
def link(self, target_desc, objects,
output_filename, output_dir=None, libraries=None,
library_dirs=None, runtime_library_dirs=None,
export_symbols=None, debug=0, extra_preargs=None,
extra_postargs=None, build_temp=None, target_lang=None):
objects, output_dir = self._fix_object_args(objects, output_dir)
fixed_args = self._fix_lib_args(libraries, library_dirs,
runtime_library_dirs)
libraries, library_dirs, runtime_library_dirs = fixed_args
lib_opts = gen_lib_options(self, library_dirs, runtime_library_dirs,
libraries)
if not isinstance(output_dir, (str, type(None))):
raise TypeError("'output_dir' must be a string or None")
if output_dir is not None:
output_filename = os.path.join(output_dir, output_filename)
if self._need_link(objects, output_filename):
ld_args = (objects + self.objects +
lib_opts + ['-o', output_filename])
if debug:
ld_args[:0] = ['-g']
if extra_preargs:
ld_args[:0] = extra_preargs
if extra_postargs:
ld_args.extend(extra_postargs)
self.mkpath(os.path.dirname(output_filename))
try:
if target_desc == CCompiler.EXECUTABLE:
linker = self.linker_exe[:]
else:
linker = self.linker_so[:]
if target_lang == "c++" and self.compiler_cxx:
# skip over environment variable settings if /usr/bin/env
# is used to set up the linker's environment.
# This is needed on OSX. Note: this assumes that the
# normal and C++ compiler have the same environment
# settings.
i = 0
if os.path.basename(linker[0]) == "env":
i = 1
while '=' in linker[i]:
i += 1
if os.path.basename(linker[i]) == 'ld_so_aix':
# AIX platforms prefix the compiler with the ld_so_aix
# script, so we need to adjust our linker index
offset = 1
else:
offset = 0
linker[i+offset] = self.compiler_cxx[i]
if sys.platform == 'darwin':
linker = _osx_support.compiler_fixup(linker, ld_args)
self.spawn(linker + ld_args)
except DistutilsExecError as msg:
raise LinkError(msg)
else:
log.debug("skipping %s (up-to-date)", output_filename)
# -- Miscellaneous methods -----------------------------------------
# These are all used by the 'gen_lib_options() function, in
# ccompiler.py.
def library_dir_option(self, dir):
return "-L" + dir
def _is_gcc(self, compiler_name):
# clang uses same syntax for rpath as gcc
return any(name in compiler_name for name in ("gcc", "g++", "clang"))
def runtime_library_dir_option(self, dir):
# XXX Hackish, at the very least. See Python bug #445902:
# http://sourceforge.net/tracker/index.php
# ?func=detail&aid=445902&group_id=5470&atid=105470
# Linkers on different platforms need different options to
# specify that directories need to be added to the list of
# directories searched for dependencies when a dynamic library
# is sought. GCC on GNU systems (Linux, FreeBSD, ...) has to
# be told to pass the -R option through to the linker, whereas
# other compilers and gcc on other systems just know this.
# Other compilers may need something slightly different. At
# this time, there's no way to determine this information from
# the configuration data stored in the Python installation, so
# we use this hack.
compiler = os.path.basename(sysconfig.get_config_var("CC"))
if sys.platform[:6] == "darwin":
# MacOSX's linker doesn't understand the -R flag at all
return "-L" + dir
elif sys.platform[:7] == "freebsd":
return "-Wl,-rpath=" + dir
elif sys.platform[:5] == "hp-ux":
if self._is_gcc(compiler):
return ["-Wl,+s", "-L" + dir]
return ["+s", "-L" + dir]
else:
if self._is_gcc(compiler):
# gcc on non-GNU systems does not need -Wl, but can
# use it anyway. Since distutils has always passed in
# -Wl whenever gcc was used in the past it is probably
# safest to keep doing so.
if sysconfig.get_config_var("GNULD") == "yes":
# GNU ld needs an extra option to get a RUNPATH
# instead of just an RPATH.
return "-Wl,--enable-new-dtags,-R" + dir
else:
return "-Wl,-R" + dir
else:
# No idea how --enable-new-dtags would be passed on to
# ld if this system was using GNU ld. Don't know if a
# system like this even exists.
return "-R" + dir
def library_option(self, lib):
return "-l" + lib
def find_library_file(self, dirs, lib, debug=0):
shared_f = self.library_filename(lib, lib_type='shared')
dylib_f = self.library_filename(lib, lib_type='dylib')
xcode_stub_f = self.library_filename(lib, lib_type='xcode_stub')
static_f = self.library_filename(lib, lib_type='static')
if sys.platform == 'darwin':
# On OSX users can specify an alternate SDK using
# '-isysroot', calculate the SDK root if it is specified
# (and use it further on)
#
# Note that, as of Xcode 7, Apple SDKs may contain textual stub
# libraries with .tbd extensions rather than the normal .dylib
# shared libraries installed in /. The Apple compiler tool
# chain handles this transparently but it can cause problems
# for programs that are being built with an SDK and searching
# for specific libraries. Callers of find_library_file need to
# keep in mind that the base filename of the returned SDK library
# file might have a different extension from that of the library
# file installed on the running system, for example:
# /Applications/Xcode.app/Contents/Developer/Platforms/
# MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk/
# usr/lib/libedit.tbd
# vs
# /usr/lib/libedit.dylib
cflags = sysconfig.get_config_var('CFLAGS')
m = re.search(r'-isysroot\s*(\S+)', cflags)
if m is None:
sysroot = _osx_support._default_sysroot(sysconfig.get_config_var('CC'))
else:
sysroot = m.group(1)
for dir in dirs:
shared = os.path.join(dir, shared_f)
dylib = os.path.join(dir, dylib_f)
static = os.path.join(dir, static_f)
xcode_stub = os.path.join(dir, xcode_stub_f)
if sys.platform == 'darwin' and (
dir.startswith('/System/') or (
dir.startswith('/usr/') and not dir.startswith('/usr/local/'))):
shared = os.path.join(sysroot, dir[1:], shared_f)
dylib = os.path.join(sysroot, dir[1:], dylib_f)
static = os.path.join(sysroot, dir[1:], static_f)
xcode_stub = os.path.join(sysroot, dir[1:], xcode_stub_f)
# We're second-guessing the linker here, with not much hard
# data to go on: GCC seems to prefer the shared library, so I'm
# assuming that *all* Unix C compilers do. And of course I'm
# ignoring even GCC's "-static" option. So sue me.
if os.path.exists(dylib):
return dylib
elif os.path.exists(xcode_stub):
return xcode_stub
elif os.path.exists(shared):
return shared
elif os.path.exists(static):
return static
# Oops, didn't find it in *any* of 'dirs'
return None
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