Implements the 'build_ext' command for building C/C++ extension modules.
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Greg Ward
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"""distutils.command.build_ext
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Implements the Distutils 'build_ext' command, for building extension
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modules (currently limited to C extensions, should accomodate C++
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extensions ASAP)."""
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# created 1999/08/09, Greg Ward
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__rcsid__ = "$Id$"
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import sys, os, string, re
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from types import *
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from distutils.core import Command
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from distutils.ccompiler import new_compiler
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from distutils.sysconfig import INCLUDEPY, SO, exec_prefix
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from distutils.errors import *
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# This is the same as a Python NAME, since we must accept any
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# valid module name for the extension name.
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extension_name_re = re.compile (r'^[a-zA-Z_][a-zA-Z_0-9]*$')
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class BuildExt (Command):
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# XXX thoughts on how to deal with complex command-line options like
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# these, i.e. how to make it so fancy_getopt can suck them off the
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# command line and make it look like setup.py defined the appropriate
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# lists of tuples of what-have-you.
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# - each command needs a callback to process its command-line options
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# - Command.__init__() needs access to its share of the whole
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# command line (must ultimately come from
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# Distribution.parse_command_line())
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# - it then calls the current command class' option-parsing
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# callback to deal with weird options like -D, which have to
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# parse the option text and churn out some custom data
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# structure
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# - that data structure (in this case, a list of 2-tuples)
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# will then be present in the command object by the time
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# we get to set_final_options() (i.e. the constructor
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# takes care of both command-line and client options
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# in between set_default_options() and set_final_options())
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options = [('dir=', 'd',
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"directory for compiled extension modules"),
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('include-dirs=', 'I',
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"list of directories to search for header files"),
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('define=', 'D',
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"C preprocessor macros to define"),
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('undef=', 'U',
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"C preprocessor macros to undefine"),
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('libs=', 'l',
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"external C libraries to link with"),
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('library-dirs=', 'L',
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"directories to search for external C libraries"),
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('rpath=', 'R',
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"directories to search for shared C libraries at runtime"),
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('link-objects=', 'O',
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"extra explicit link objects to include in the link"),
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]
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def set_default_options (self):
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self.dir = None
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self.include_dirs = None
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self.define = None
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self.undef = None
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self.libs = None
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self.library_dirs = None
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self.rpath = None
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self.link_objects = None
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def set_final_options (self):
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self.set_undefined_options ('build', ('platdir', 'dir'))
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# Make sure Python's include directories (for Python.h, config.h,
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# etc.) are in the include search path. We have to roll our own
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# "exec include dir", because the Makefile parsed by sysconfig
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# doesn't have it (sigh).
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py_include = INCLUDEPY # prefix + "include" + "python" + ver
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exec_py_include = os.path.join (exec_prefix, 'include',
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'python' + sys.version[0:3])
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if self.include_dirs is None:
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self.include_dirs = []
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self.include_dirs.insert (0, py_include)
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if exec_py_include != py_include:
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self.include_dirs.insert (0, exec_py_include)
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def run (self):
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self.set_final_options ()
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(extensions, package) = \
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self.distribution.get_options ('ext_modules', 'package')
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# 'extensions', as supplied by setup.py, is a list of 2-tuples.
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# Each tuple is simple:
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# (ext_name, build_info)
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# build_info is a dictionary containing everything specific to
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# building this extension. (Info pertaining to all extensions
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# should be handled by general distutils options passed from
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# setup.py down to right here, but that's not taken care of yet.)
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# First, sanity-check the 'extensions' list
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self.check_extensions_list (extensions)
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# Setup the CCompiler object that we'll use to do all the
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# compiling and linking
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self.compiler = new_compiler (verbose=self.distribution.verbose,
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dry_run=self.distribution.dry_run)
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if self.include_dirs is not None:
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self.compiler.set_include_dirs (self.include_dirs)
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if self.define is not None:
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# 'define' option is a list of (name,value) tuples
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for (name,value) in self.define:
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self.compiler.define_macro (name, value)
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if self.undef is not None:
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for macro in self.undef:
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self.compiler.undefine_macro (macro)
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if self.libs is not None:
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self.compiler.set_libraries (self.libs)
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if self.library_dirs is not None:
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self.compiler.set_library_dirs (self.library_dirs)
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if self.rpath is not None:
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self.compiler.set_runtime_library_dirs (self.rpath)
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if self.link_objects is not None:
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self.compiler.set_link_objects (self.link_objects)
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# Now the real loop over extensions
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self.build_extensions (extensions)
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def check_extensions_list (self, extensions):
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if type (extensions) is not ListType:
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raise DistutilsValueError, \
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"'ext_modules' option must be a list of tuples"
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for ext in extensions:
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if type (ext) is not TupleType and len (ext) != 2:
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raise DistutilsValueError, \
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"each element of 'ext_modules' option must be a 2-tuple"
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if not (type (ext[0]) is StringType and
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extension_name_re.match (ext[0])):
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raise DistutilsValueError, \
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"first element of each tuple in 'ext_modules' " + \
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"must be the extension name (a string)"
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if type (ext[1]) is not DictionaryType:
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raise DistutilsValueError, \
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"second element of each tuple in 'ext_modules' " + \
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"must be a dictionary"
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# end sanity-check for
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# check_extensions_list ()
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def build_extensions (self, extensions):
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for (extension_name, build_info) in extensions:
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sources = build_info.get ('sources')
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if sources is None or type (sources) is not ListType:
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raise DistutilsValueError, \
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"in ext_modules option, 'sources' must be present " + \
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"and must be a list of source filenames"
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macros = build_info.get ('macros')
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include_dirs = build_info.get ('include_dirs')
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self.compiler.compile (sources, macros, include_dirs)
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objects = self.compiler.object_filenames (sources)
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extra_objects = build_info.get ('extra_objects')
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if extra_objects:
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objects.extend (extra_objects)
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libraries = build_info.get ('libraries')
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library_dirs = build_info.get ('library_dirs')
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ext_filename = self.extension_filename (extension_name)
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self.compiler.link_shared_object (objects, ext_filename,
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libraries, library_dirs)
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# build_extensions ()
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def extension_filename (self, ext_name):
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return ext_name + SO
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# class BuildExt
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