| 1 | """distutils.extension
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| 2 |
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| 3 | Provides the Extension class, used to describe C/C++ extension
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| 4 | modules in setup scripts."""
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| 5 |
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| 6 | __revision__ = "$Id$"
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| 7 |
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| 8 | import os, string, sys
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| 9 | from types import *
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| 10 |
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| 11 | try:
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| 12 | import warnings
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| 13 | except ImportError:
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| 14 | warnings = None
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| 15 |
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| 16 | # This class is really only used by the "build_ext" command, so it might
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| 17 | # make sense to put it in distutils.command.build_ext. However, that
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| 18 | # module is already big enough, and I want to make this class a bit more
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| 19 | # complex to simplify some common cases ("foo" module in "foo.c") and do
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| 20 | # better error-checking ("foo.c" actually exists).
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| 21 | #
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| 22 | # Also, putting this in build_ext.py means every setup script would have to
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| 23 | # import that large-ish module (indirectly, through distutils.core) in
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| 24 | # order to do anything.
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| 25 |
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| 26 | class Extension:
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| 27 | """Just a collection of attributes that describes an extension
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| 28 | module and everything needed to build it (hopefully in a portable
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| 29 | way, but there are hooks that let you be as unportable as you need).
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| 30 |
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| 31 | Instance attributes:
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| 32 | name : string
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| 33 | the full name of the extension, including any packages -- ie.
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| 34 | *not* a filename or pathname, but Python dotted name
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| 35 | sources : [string]
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| 36 | list of source filenames, relative to the distribution root
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| 37 | (where the setup script lives), in Unix form (slash-separated)
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| 38 | for portability. Source files may be C, C++, SWIG (.i),
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| 39 | platform-specific resource files, or whatever else is recognized
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| 40 | by the "build_ext" command as source for a Python extension.
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| 41 | include_dirs : [string]
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| 42 | list of directories to search for C/C++ header files (in Unix
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| 43 | form for portability)
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| 44 | define_macros : [(name : string, value : string|None)]
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| 45 | list of macros to define; each macro is defined using a 2-tuple,
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| 46 | where 'value' is either the string to define it to or None to
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| 47 | define it without a particular value (equivalent of "#define
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| 48 | FOO" in source or -DFOO on Unix C compiler command line)
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| 49 | undef_macros : [string]
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| 50 | list of macros to undefine explicitly
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| 51 | library_dirs : [string]
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| 52 | list of directories to search for C/C++ libraries at link time
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| 53 | libraries : [string]
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| 54 | list of library names (not filenames or paths) to link against
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| 55 | runtime_library_dirs : [string]
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| 56 | list of directories to search for C/C++ libraries at run time
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| 57 | (for shared extensions, this is when the extension is loaded)
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| 58 | extra_objects : [string]
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| 59 | list of extra files to link with (eg. object files not implied
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| 60 | by 'sources', static library that must be explicitly specified,
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| 61 | binary resource files, etc.)
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| 62 | extra_compile_args : [string]
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| 63 | any extra platform- and compiler-specific information to use
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| 64 | when compiling the source files in 'sources'. For platforms and
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| 65 | compilers where "command line" makes sense, this is typically a
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| 66 | list of command-line arguments, but for other platforms it could
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| 67 | be anything.
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| 68 | extra_link_args : [string]
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| 69 | any extra platform- and compiler-specific information to use
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| 70 | when linking object files together to create the extension (or
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| 71 | to create a new static Python interpreter). Similar
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| 72 | interpretation as for 'extra_compile_args'.
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| 73 | export_symbols : [string]
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| 74 | list of symbols to be exported from a shared extension. Not
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| 75 | used on all platforms, and not generally necessary for Python
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| 76 | extensions, which typically export exactly one symbol: "init" +
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| 77 | extension_name.
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| 78 | swig_opts : [string]
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| 79 | any extra options to pass to SWIG if a source file has the .i
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| 80 | extension.
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| 81 | depends : [string]
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| 82 | list of files that the extension depends on
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| 83 | language : string
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| 84 | extension language (i.e. "c", "c++", "objc"). Will be detected
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| 85 | from the source extensions if not provided.
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| 86 | """
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| 87 |
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| 88 | # When adding arguments to this constructor, be sure to update
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| 89 | # setup_keywords in core.py.
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| 90 | def __init__ (self, name, sources,
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| 91 | include_dirs=None,
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| 92 | define_macros=None,
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| 93 | undef_macros=None,
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| 94 | library_dirs=None,
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| 95 | libraries=None,
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| 96 | runtime_library_dirs=None,
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| 97 | extra_objects=None,
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| 98 | extra_compile_args=None,
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| 99 | extra_link_args=None,
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| 100 | export_symbols=None,
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| 101 | swig_opts = None,
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| 102 | depends=None,
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| 103 | language=None,
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| 104 | **kw # To catch unknown keywords
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| 105 | ):
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| 106 | assert type(name) is StringType, "'name' must be a string"
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| 107 | assert (type(sources) is ListType and
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| 108 | map(type, sources) == [StringType]*len(sources)), \
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| 109 | "'sources' must be a list of strings"
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| 110 |
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| 111 | self.name = name
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| 112 | self.sources = sources
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| 113 | self.include_dirs = include_dirs or []
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| 114 | self.define_macros = define_macros or []
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| 115 | self.undef_macros = undef_macros or []
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| 116 | self.library_dirs = library_dirs or []
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| 117 | self.libraries = libraries or []
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| 118 | self.runtime_library_dirs = runtime_library_dirs or []
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| 119 | self.extra_objects = extra_objects or []
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| 120 | self.extra_compile_args = extra_compile_args or []
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| 121 | self.extra_link_args = extra_link_args or []
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| 122 | self.export_symbols = export_symbols or []
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| 123 | self.swig_opts = swig_opts or []
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| 124 | self.depends = depends or []
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| 125 | self.language = language
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| 126 |
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| 127 | # If there are unknown keyword options, warn about them
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| 128 | if len(kw):
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| 129 | L = kw.keys() ; L.sort()
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| 130 | L = map(repr, L)
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| 131 | msg = "Unknown Extension options: " + string.join(L, ', ')
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| 132 | if warnings is not None:
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| 133 | warnings.warn(msg)
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| 134 | else:
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| 135 | sys.stderr.write(msg + '\n')
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| 136 | # class Extension
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| 137 |
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| 138 |
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| 139 | def read_setup_file (filename):
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| 140 | from distutils.sysconfig import \
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| 141 | parse_makefile, expand_makefile_vars, _variable_rx
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| 142 | from distutils.text_file import TextFile
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| 143 | from distutils.util import split_quoted
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| 144 |
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| 145 | # First pass over the file to gather "VAR = VALUE" assignments.
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| 146 | vars = parse_makefile(filename)
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| 147 |
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| 148 | # Second pass to gobble up the real content: lines of the form
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| 149 | # <module> ... [<sourcefile> ...] [<cpparg> ...] [<library> ...]
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| 150 | file = TextFile(filename,
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| 151 | strip_comments=1, skip_blanks=1, join_lines=1,
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| 152 | lstrip_ws=1, rstrip_ws=1)
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| 153 | try:
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| 154 | extensions = []
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| 155 |
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| 156 | while 1:
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| 157 | line = file.readline()
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| 158 | if line is None: # eof
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| 159 | break
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| 160 | if _variable_rx.match(line): # VAR=VALUE, handled in first pass
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| 161 | continue
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| 162 |
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| 163 | if line[0] == line[-1] == "*":
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| 164 | file.warn("'%s' lines not handled yet" % line)
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| 165 | continue
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| 166 |
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| 167 | #print "original line: " + line
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| 168 | line = expand_makefile_vars(line, vars)
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| 169 | words = split_quoted(line)
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| 170 | #print "expanded line: " + line
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| 171 |
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| 172 | # NB. this parses a slightly different syntax than the old
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| 173 | # makesetup script: here, there must be exactly one extension per
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| 174 | # line, and it must be the first word of the line. I have no idea
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| 175 | # why the old syntax supported multiple extensions per line, as
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| 176 | # they all wind up being the same.
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| 177 |
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| 178 | module = words[0]
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| 179 | ext = Extension(module, [])
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| 180 | append_next_word = None
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| 181 |
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| 182 | for word in words[1:]:
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| 183 | if append_next_word is not None:
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| 184 | append_next_word.append(word)
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| 185 | append_next_word = None
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| 186 | continue
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| 187 |
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| 188 | suffix = os.path.splitext(word)[1]
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| 189 | switch = word[0:2] ; value = word[2:]
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| 190 |
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| 191 | if suffix in (".c", ".cc", ".cpp", ".cxx", ".c++", ".m", ".mm"):
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| 192 | # hmm, should we do something about C vs. C++ sources?
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| 193 | # or leave it up to the CCompiler implementation to
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| 194 | # worry about?
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| 195 | ext.sources.append(word)
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| 196 | elif switch == "-I":
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| 197 | ext.include_dirs.append(value)
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| 198 | elif switch == "-D":
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| 199 | equals = string.find(value, "=")
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| 200 | if equals == -1: # bare "-DFOO" -- no value
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| 201 | ext.define_macros.append((value, None))
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| 202 | else: # "-DFOO=blah"
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| 203 | ext.define_macros.append((value[0:equals],
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| 204 | value[equals+2:]))
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| 205 | elif switch == "-U":
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| 206 | ext.undef_macros.append(value)
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| 207 | elif switch == "-C": # only here 'cause makesetup has it!
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| 208 | ext.extra_compile_args.append(word)
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| 209 | elif switch == "-l":
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| 210 | ext.libraries.append(value)
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| 211 | elif switch == "-L":
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| 212 | ext.library_dirs.append(value)
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| 213 | elif switch == "-R":
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| 214 | ext.runtime_library_dirs.append(value)
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| 215 | elif word == "-rpath":
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| 216 | append_next_word = ext.runtime_library_dirs
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| 217 | elif word == "-Xlinker":
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| 218 | append_next_word = ext.extra_link_args
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| 219 | elif word == "-Xcompiler":
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| 220 | append_next_word = ext.extra_compile_args
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| 221 | elif switch == "-u":
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| 222 | ext.extra_link_args.append(word)
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| 223 | if not value:
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| 224 | append_next_word = ext.extra_link_args
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| 225 | elif word == "-Xcompiler":
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| 226 | append_next_word = ext.extra_compile_args
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| 227 | elif switch == "-u":
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| 228 | ext.extra_link_args.append(word)
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| 229 | if not value:
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| 230 | append_next_word = ext.extra_link_args
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| 231 | elif suffix in (".a", ".so", ".sl", ".o", ".dylib"):
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| 232 | # NB. a really faithful emulation of makesetup would
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| 233 | # append a .o file to extra_objects only if it
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| 234 | # had a slash in it; otherwise, it would s/.o/.c/
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| 235 | # and append it to sources. Hmmmm.
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| 236 | ext.extra_objects.append(word)
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| 237 | else:
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| 238 | file.warn("unrecognized argument '%s'" % word)
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| 239 |
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| 240 | extensions.append(ext)
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| 241 | finally:
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| 242 | file.close()
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| 243 |
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| 244 | #print "module:", module
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| 245 | #print "source files:", source_files
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| 246 | #print "cpp args:", cpp_args
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| 247 | #print "lib args:", library_args
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| 248 |
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| 249 | #extensions[module] = { 'sources': source_files,
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| 250 | # 'cpp_args': cpp_args,
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| 251 | # 'lib_args': library_args }
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| 252 |
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| 253 | return extensions
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| 254 |
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| 255 | # read_setup_file ()
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