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unixccompiler.py
"""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 # filter out standard library paths, which are not explicitely needed # for linking system_libdirs = ['/lib', '/lib64', '/usr/lib', '/usr/lib64'] multiarch = sysconfig.get_config_var("MULTIARCH") if multiarch: system_libdirs.extend(['/lib/%s' % multiarch, '/usr/lib/%s' % multiarch]) library_dirs = [dir for dir in library_dirs if not dir in system_libdirs] runtime_library_dirs = [dir for dir in runtime_library_dirs if not dir in system_libdirs] 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): return "gcc" in compiler_name or "g++" in compiler_name 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