name : cygwinccompiler.py """distutils.cygwinccompiler Provides the CygwinCCompiler class, a subclass of UnixCCompiler that handles the Cygwin port of the GNU C compiler to Windows. It also contains the Mingw32CCompiler class which handles the mingw32 port of GCC (same as cygwin in no-cygwin mode). """ import copy import os import pathlib import shlex import sys import warnings from subprocess import check_output from .errors import ( CCompilerError, CompileError, DistutilsExecError, DistutilsPlatformError, ) from .file_util import write_file from .sysconfig import get_config_vars from .unixccompiler import UnixCCompiler from .version import LooseVersion, suppress_known_deprecation def get_msvcr(): """No longer needed, but kept for backward compatibility.""" return [] _runtime_library_dirs_msg = ( "Unable to set runtime library search path on Windows, " "usually indicated by `runtime_library_dirs` parameter to Extension" ) class CygwinCCompiler(UnixCCompiler): """Handles the Cygwin port of the GNU C compiler to Windows.""" compiler_type = 'cygwin' obj_extension = ".o" static_lib_extension = ".a" shared_lib_extension = ".dll.a" dylib_lib_extension = ".dll" static_lib_format = "lib%s%s" shared_lib_format = "lib%s%s" dylib_lib_format = "cyg%s%s" exe_extension = ".exe" def __init__(self, verbose=False, dry_run=False, force=False): super().__init__(verbose, dry_run, force) status, details = check_config_h() self.debug_print(f"Python's GCC status: {status} (details: {details})") if status is not CONFIG_H_OK: self.warn( "Python's pyconfig.h doesn't seem to support your compiler. " f"Reason: {details}. " "Compiling may fail because of undefined preprocessor macros." ) self.cc, self.cxx = get_config_vars('CC', 'CXX') # Override 'CC' and 'CXX' environment variables for # building using MINGW compiler for MSVC python. self.cc = os.environ.get('CC', self.cc or 'gcc') self.cxx = os.environ.get('CXX', self.cxx or 'g++') self.linker_dll = self.cc self.linker_dll_cxx = self.cxx shared_option = "-shared" self.set_executables( compiler=f'{self.cc} -mcygwin -O -Wall', compiler_so=f'{self.cc} -mcygwin -mdll -O -Wall', compiler_cxx=f'{self.cxx} -mcygwin -O -Wall', compiler_so_cxx=f'{self.cxx} -mcygwin -mdll -O -Wall', linker_exe=f'{self.cc} -mcygwin', linker_so=f'{self.linker_dll} -mcygwin {shared_option}', linker_exe_cxx=f'{self.cxx} -mcygwin', linker_so_cxx=f'{self.linker_dll_cxx} -mcygwin {shared_option}', ) self.dll_libraries = get_msvcr() @property def gcc_version(self): # Older numpy depended on this existing to check for ancient # gcc versions. This doesn't make much sense with clang etc so # just hardcode to something recent. # https://github.com/numpy/numpy/pull/20333 warnings.warn( "gcc_version attribute of CygwinCCompiler is deprecated. " "Instead of returning actual gcc version a fixed value 11.2.0 is returned.", DeprecationWarning, stacklevel=2, ) with suppress_known_deprecation(): return LooseVersion("11.2.0") def _compile(self, obj, src, ext, cc_args, extra_postargs, pp_opts): """Compiles the source by spawning GCC and windres if needed.""" if ext in ('.rc', '.res'): # gcc needs '.res' and '.rc' compiled to object files !!! try: self.spawn(["windres", "-i", src, "-o", obj]) except DistutilsExecError as msg: raise CompileError(msg) else: # for other files use the C-compiler try: if self.detect_language(src) == 'c++': self.spawn( self.compiler_so_cxx + cc_args + [src, '-o', obj] + extra_postargs ) else: self.spawn( self.compiler_so + cc_args + [src, '-o', obj] + extra_postargs ) except DistutilsExecError as msg: raise CompileError(msg) def link( self, target_desc, objects, output_filename, output_dir=None, libraries=None, library_dirs=None, runtime_library_dirs=None, export_symbols=None, debug=False, extra_preargs=None, extra_postargs=None, build_temp=None, target_lang=None, ): """Link the objects.""" # use separate copies, so we can modify the lists extra_preargs = copy.copy(extra_preargs or []) libraries = copy.copy(libraries or []) objects = copy.copy(objects or []) if runtime_library_dirs: self.warn(_runtime_library_dirs_msg) # Additional libraries libraries.extend(self.dll_libraries) # handle export symbols by creating a def-file # with executables this only works with gcc/ld as linker if (export_symbols is not None) and ( target_desc != self.EXECUTABLE or self.linker_dll == "gcc" ): # (The linker doesn't do anything if output is up-to-date. # So it would probably better to check if we really need this, # but for this we had to insert some unchanged parts of # UnixCCompiler, and this is not what we want.) # we want to put some files in the same directory as the # object files are, build_temp doesn't help much # where are the object files temp_dir = os.path.dirname(objects[0]) # name of dll to give the helper files the same base name (dll_name, dll_extension) = os.path.splitext( os.path.basename(output_filename) ) # generate the filenames for these files def_file = os.path.join(temp_dir, dll_name + ".def") # Generate .def file contents = [f"LIBRARY {os.path.basename(output_filename)}", "EXPORTS"] contents.extend(export_symbols) self.execute(write_file, (def_file, contents), f"writing {def_file}") # next add options for def-file # for gcc/ld the def-file is specified as any object files objects.append(def_file) # end: if ((export_symbols is not None) and # (target_desc != self.EXECUTABLE or self.linker_dll == "gcc")): # who wants symbols and a many times larger output file # should explicitly switch the debug mode on # otherwise we let ld strip the output file # (On my machine: 10KiB < stripped_file < ??100KiB # unstripped_file = stripped_file + XXX KiB # ( XXX=254 for a typical python extension)) if not debug: extra_preargs.append("-s") UnixCCompiler.link( self, target_desc, objects, output_filename, output_dir, libraries, library_dirs, runtime_library_dirs, None, # export_symbols, we do this in our def-file debug, extra_preargs, extra_postargs, build_temp, target_lang, ) def runtime_library_dir_option(self, dir): # cygwin doesn't support rpath. While in theory we could error # out like MSVC does, code might expect it to work like on Unix, so # just warn and hope for the best. self.warn(_runtime_library_dirs_msg) return [] # -- Miscellaneous methods ----------------------------------------- def _make_out_path(self, output_dir, strip_dir, src_name): # use normcase to make sure '.rc' is really '.rc' and not '.RC' norm_src_name = os.path.normcase(src_name) return super()._make_out_path(output_dir, strip_dir, norm_src_name) @property def out_extensions(self): """ Add support for rc and res files. """ return { **super().out_extensions, **{ext: ext + self.obj_extension for ext in ('.res', '.rc')}, } # the same as cygwin plus some additional parameters class Mingw32CCompiler(CygwinCCompiler): """Handles the Mingw32 port of the GNU C compiler to Windows.""" compiler_type = 'mingw32' def __init__(self, verbose=False, dry_run=False, force=False): super().__init__(verbose, dry_run, force) shared_option = "-shared" if is_cygwincc(self.cc): raise CCompilerError('Cygwin gcc cannot be used with --compiler=mingw32') self.set_executables( compiler=f'{self.cc} -O -Wall', compiler_so=f'{self.cc} -shared -O -Wall', compiler_so_cxx=f'{self.cxx} -shared -O -Wall', compiler_cxx=f'{self.cxx} -O -Wall', linker_exe=f'{self.cc}', linker_so=f'{self.linker_dll} {shared_option}', linker_exe_cxx=f'{self.cxx}', linker_so_cxx=f'{self.linker_dll_cxx} {shared_option}', ) def runtime_library_dir_option(self, dir): raise DistutilsPlatformError(_runtime_library_dirs_msg) # Because these compilers aren't configured in Python's pyconfig.h file by # default, we should at least warn the user if he is using an unmodified # version. CONFIG_H_OK = "ok" CONFIG_H_NOTOK = "not ok" CONFIG_H_UNCERTAIN = "uncertain" def check_config_h(): """Check if the current Python installation appears amenable to building extensions with GCC. Returns a tuple (status, details), where 'status' is one of the following constants: - CONFIG_H_OK: all is well, go ahead and compile - CONFIG_H_NOTOK: doesn't look good - CONFIG_H_UNCERTAIN: not sure -- unable to read pyconfig.h 'details' is a human-readable string explaining the situation. Note there are two ways to conclude "OK": either 'sys.version' contains the string "GCC" (implying that this Python was built with GCC), or the installed "pyconfig.h" contains the string "__GNUC__". """ # XXX since this function also checks sys.version, it's not strictly a # "pyconfig.h" check -- should probably be renamed... from distutils import sysconfig # if sys.version contains GCC then python was compiled with GCC, and the # pyconfig.h file should be OK if "GCC" in sys.version: return CONFIG_H_OK, "sys.version mentions 'GCC'" # Clang would also work if "Clang" in sys.version: return CONFIG_H_OK, "sys.version mentions 'Clang'" # let's see if __GNUC__ is mentioned in python.h fn = sysconfig.get_config_h_filename() try: config_h = pathlib.Path(fn).read_text(encoding='utf-8') except OSError as exc: return (CONFIG_H_UNCERTAIN, f"couldn't read '{fn}': {exc.strerror}") else: substring = '__GNUC__' if substring in config_h: code = CONFIG_H_OK mention_inflected = 'mentions' else: code = CONFIG_H_NOTOK mention_inflected = 'does not mention' return code, f"{fn!r} {mention_inflected} {substring!r}" def is_cygwincc(cc): """Try to determine if the compiler that would be used is from cygwin.""" out_string = check_output(shlex.split(cc) + ['-dumpmachine']) return out_string.strip().endswith(b'cygwin') get_versions = None """ A stand-in for the previous get_versions() function to prevent failures when monkeypatched. See pypa/setuptools#2969. """