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build_clib.py
"""distutils.command.build_clib Implements the Distutils 'build_clib' command, to build a C/C++ library that is included in the module distribution and needed by an extension module.""" # XXX this module has *lots* of code ripped-off quite transparently from # build_ext.py -- not surprisingly really, as the work required to build # a static library from a collection of C source files is not really all # that different from what's required to build a shared object file from # a collection of C source files. Nevertheless, I haven't done the # necessary refactoring to account for the overlap in code between the # two modules, mainly because a number of subtle details changed in the # cut 'n paste. Sigh. import os from ..core import Command from ..errors import DistutilsSetupError from ..sysconfig import customize_compiler from distutils._log import log def show_compilers(): from ..ccompiler import show_compilers show_compilers() class build_clib(Command): description = "build C/C++ libraries used by Python extensions" user_options = [ ('build-clib=', 'b', "directory to build C/C++ libraries to"), ('build-temp=', 't', "directory to put temporary build by-products"), ('debug', 'g', "compile with debugging information"), ('force', 'f', "forcibly build everything (ignore file timestamps)"), ('compiler=', 'c', "specify the compiler type"), ] boolean_options = ['debug', 'force'] help_options = [ ('help-compiler', None, "list available compilers", show_compilers), ] def initialize_options(self): self.build_clib = None self.build_temp = None # List of libraries to build self.libraries = None # Compilation options for all libraries self.include_dirs = None self.define = None self.undef = None self.debug = None self.force = 0 self.compiler = None def finalize_options(self): # This might be confusing: both build-clib and build-temp default # to build-temp as defined by the "build" command. This is because # I think that C libraries are really just temporary build # by-products, at least from the point of view of building Python # extensions -- but I want to keep my options open. self.set_undefined_options( 'build', ('build_temp', 'build_clib'), ('build_temp', 'build_temp'), ('compiler', 'compiler'), ('debug', 'debug'), ('force', 'force'), ) self.libraries = self.distribution.libraries if self.libraries: self.check_library_list(self.libraries) if self.include_dirs is None: self.include_dirs = self.distribution.include_dirs or [] if isinstance(self.include_dirs, str): self.include_dirs = self.include_dirs.split(os.pathsep) # XXX same as for build_ext -- what about 'self.define' and # 'self.undef' ? def run(self): if not self.libraries: return # Yech -- this is cut 'n pasted from build_ext.py! from ..ccompiler import new_compiler self.compiler = new_compiler( compiler=self.compiler, dry_run=self.dry_run, force=self.force ) customize_compiler(self.compiler) if self.include_dirs is not None: self.compiler.set_include_dirs(self.include_dirs) if self.define is not None: # 'define' option is a list of (name,value) tuples for name, value in self.define: self.compiler.define_macro(name, value) if self.undef is not None: for macro in self.undef: self.compiler.undefine_macro(macro) self.build_libraries(self.libraries) def check_library_list(self, libraries): """Ensure that the list of libraries is valid. `library` is presumably provided as a command option 'libraries'. This method checks that it is a list of 2-tuples, where the tuples are (library_name, build_info_dict). Raise DistutilsSetupError if the structure is invalid anywhere; just returns otherwise. """ if not isinstance(libraries, list): raise DistutilsSetupError("'libraries' option must be a list of tuples") for lib in libraries: if not isinstance(lib, tuple) and len(lib) != 2: raise DistutilsSetupError("each element of 'libraries' must a 2-tuple") name, build_info = lib if not isinstance(name, str): raise DistutilsSetupError( "first element of each tuple in 'libraries' " "must be a string (the library name)" ) if '/' in name or (os.sep != '/' and os.sep in name): raise DistutilsSetupError( "bad library name '%s': " "may not contain directory separators" % lib[0] ) if not isinstance(build_info, dict): raise DistutilsSetupError( "second element of each tuple in 'libraries' " "must be a dictionary (build info)" ) def get_library_names(self): # Assume the library list is valid -- 'check_library_list()' is # called from 'finalize_options()', so it should be! if not self.libraries: return None lib_names = [] for lib_name, build_info in self.libraries: lib_names.append(lib_name) return lib_names def get_source_files(self): self.check_library_list(self.libraries) filenames = [] for lib_name, build_info in self.libraries: sources = build_info.get('sources') if sources is None or not isinstance(sources, (list, tuple)): raise DistutilsSetupError( "in 'libraries' option (library '%s'), " "'sources' must be present and must be " "a list of source filenames" % lib_name ) filenames.extend(sources) return filenames def build_libraries(self, libraries): for lib_name, build_info in libraries: sources = build_info.get('sources') if sources is None or not isinstance(sources, (list, tuple)): raise DistutilsSetupError( "in 'libraries' option (library '%s'), " "'sources' must be present and must be " "a list of source filenames" % lib_name ) sources = list(sources) log.info("building '%s' library", lib_name) # First, compile the source code to object files in the library # directory. (This should probably change to putting object # files in a temporary build directory.) macros = build_info.get('macros') include_dirs = build_info.get('include_dirs') objects = self.compiler.compile( sources, output_dir=self.build_temp, macros=macros, include_dirs=include_dirs, debug=self.debug, ) # Now "link" the object files together into a static library. # (On Unix at least, this isn't really linking -- it just # builds an archive. Whatever.) self.compiler.create_static_lib( objects, lib_name, output_dir=self.build_clib, debug=self.debug )
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