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File Name : config.py

"""distutils.command.config

Implements the Distutils 'config' command, a (mostly) empty command class
that exists mainly to be sub-classed by specific module distributions and
applications.  The idea is that while every "config" command is different,
at least they're all named the same, and users always see "config" in the
list of standard commands.  Also, this is a good place to put common
configure-like tasks: "try to compile this C code", or "figure out where
this header file lives".
"""

import os, re

from distutils.core import Command
from distutils.errors import DistutilsExecError
from distutils.sysconfig import customize_compiler
from distutils import log

LANG_EXT = {"c": ".c", "c++": ".cxx"}

class config(Command):

description = "prepare to build"

user_options = [
        ('compiler=', None,
         "specify the compiler type"),
        ('cc=', None,
         "specify the compiler executable"),
        ('include-dirs=', 'I',
         "list of directories to search for header files"),
        ('define=', 'D',
         "C preprocessor macros to define"),
        ('undef=', 'U',
         "C preprocessor macros to undefine"),
        ('libraries=', 'l',
         "external C libraries to link with"),
        ('library-dirs=', 'L',
         "directories to search for external C libraries"),

('noisy', None,
         "show every action (compile, link, run, ...) taken"),
        ('dump-source', None,
         "dump generated source files before attempting to compile them"),
        ]

# The three standard command methods: since the "config" command
    # does nothing by default, these are empty.

def initialize_options(self):
        self.compiler = None
        self.cc = None
        self.include_dirs = None
        self.libraries = None
        self.library_dirs = None

# maximal output for now
        self.noisy = 1
        self.dump_source = 1

# list of temporary files generated along-the-way that we have
        # to clean at some point
        self.temp_files = []

def finalize_options(self):
        if self.include_dirs is None:
            self.include_dirs = self.distribution.include_dirs or []
        elif isinstance(self.include_dirs, str):
            self.include_dirs = self.include_dirs.split(os.pathsep)

if self.libraries is None:
            self.libraries = []
        elif isinstance(self.libraries, str):
            self.libraries = [self.libraries]

if self.library_dirs is None:
            self.library_dirs = []
        elif isinstance(self.library_dirs, str):
            self.library_dirs = self.library_dirs.split(os.pathsep)

def run(self):
        pass

# Utility methods for actual "config" commands.  The interfaces are
    # loosely based on Autoconf macros of similar names.  Sub-classes
    # may use these freely.

def _check_compiler(self):
        """Check that 'self.compiler' really is a CCompiler object;
        if not, make it one.
        """
        # We do this late, and only on-demand, because this is an expensive
        # import.
        from distutils.ccompiler import CCompiler, new_compiler
        if not isinstance(self.compiler, CCompiler):
            self.compiler = new_compiler(compiler=self.compiler,
                                         dry_run=self.dry_run, force=1)
            customize_compiler(self.compiler)
            if self.include_dirs:
                self.compiler.set_include_dirs(self.include_dirs)
            if self.libraries:
                self.compiler.set_libraries(self.libraries)
            if self.library_dirs:
                self.compiler.set_library_dirs(self.library_dirs)

def _gen_temp_sourcefile(self, body, headers, lang):
        filename = "_configtest" + LANG_EXT[lang]
        with open(filename, "w") as file:
            if headers:
                for header in headers:
                    file.write("#include <%s>\n" % header)
                file.write("\n")
            file.write(body)
            if body[-1] != "\n":
                file.write("\n")
        return filename

def _preprocess(self, body, headers, include_dirs, lang):
        src = self._gen_temp_sourcefile(body, headers, lang)
        out = "_configtest.i"
        self.temp_files.extend([src, out])
        self.compiler.preprocess(src, out, include_dirs=include_dirs)
        return (src, out)

def _compile(self, body, headers, include_dirs, lang):
        src = self._gen_temp_sourcefile(body, headers, lang)
        if self.dump_source:
            dump_file(src, "compiling '%s':" % src)
        (obj,) = self.compiler.object_filenames([src])
        self.temp_files.extend([src, obj])
        self.compiler.compile([src], include_dirs=include_dirs)
        return (src, obj)

def _link(self, body, headers, include_dirs, libraries, library_dirs,
              lang):
        (src, obj) = self._compile(body, headers, include_dirs, lang)
        prog = os.path.splitext(os.path.basename(src))[0]
        self.compiler.link_executable([obj], prog,
                                      libraries=libraries,
                                      library_dirs=library_dirs,
                                      target_lang=lang)

if self.compiler.exe_extension is not None:
            prog = prog + self.compiler.exe_extension
        self.temp_files.append(prog)

return (src, obj, prog)

def _clean(self, *filenames):
        if not filenames:
            filenames = self.temp_files
            self.temp_files = []
        log.info("removing: %s", ' '.join(filenames))
        for filename in filenames:
            try:
                os.remove(filename)
            except OSError:
                pass

# XXX these ignore the dry-run flag: what to do, what to do? even if
    # you want a dry-run build, you still need some sort of configuration
    # info.  My inclination is to make it up to the real config command to
    # consult 'dry_run', and assume a default (minimal) configuration if
    # true.  The problem with trying to do it here is that you'd have to
    # return either true or false from all the 'try' methods, neither of
    # which is correct.

# XXX need access to the header search path and maybe default macros.

def try_cpp(self, body=None, headers=None, include_dirs=None, lang="c"):
        """Construct a source file from 'body' (a string containing lines
        of C/C++ code) and 'headers' (a list of header files to include)
        and run it through the preprocessor.  Return true if the
        preprocessor succeeded, false if there were any errors.
        ('body' probably isn't of much use, but what the heck.)
        """
        from distutils.ccompiler import CompileError
        self._check_compiler()
        ok = True
        try:
            self._preprocess(body, headers, include_dirs, lang)
        except CompileError:
            ok = False

self._clean()
        return ok

def search_cpp(self, pattern, body=None, headers=None, include_dirs=None,
                   lang="c"):
        """Construct a source file (just like 'try_cpp()'), run it through
        the preprocessor, and return true if any line of the output matches
        'pattern'.  'pattern' should either be a compiled regex object or a
        string containing a regex.  If both 'body' and 'headers' are None,
        preprocesses an empty file -- which can be useful to determine the
        symbols the preprocessor and compiler set by default.
        """
        self._check_compiler()
        src, out = self._preprocess(body, headers, include_dirs, lang)

if isinstance(pattern, str):
            pattern = re.compile(pattern)

with open(out) as file:
            match = False
            while True:
                line = file.readline()
                if line == '':
                    break
                if pattern.search(line):
                    match = True
                    break

self._clean()
        return match

def try_compile(self, body, headers=None, include_dirs=None, lang="c"):
        """Try to compile a source file built from 'body' and 'headers'.
        Return true on success, false otherwise.
        """
        from distutils.ccompiler import CompileError
        self._check_compiler()
        try:
            self._compile(body, headers, include_dirs, lang)
            ok = True
        except CompileError:
            ok = False

log.info(ok and "success!" or "failure.")
        self._clean()
        return ok

def try_link(self, body, headers=None, include_dirs=None, libraries=None,
                 library_dirs=None, lang="c"):
        """Try to compile and link a source file, built from 'body' and
        'headers', to executable form.  Return true on success, false
        otherwise.
        """
        from distutils.ccompiler import CompileError, LinkError
        self._check_compiler()
        try:
            self._link(body, headers, include_dirs,
                       libraries, library_dirs, lang)
            ok = True
        except (CompileError, LinkError):
            ok = False

log.info(ok and "success!" or "failure.")
        self._clean()
        return ok

def try_run(self, body, headers=None, include_dirs=None, libraries=None,
                library_dirs=None, lang="c"):
        """Try to compile, link to an executable, and run a program
        built from 'body' and 'headers'.  Return true on success, false
        otherwise.
        """
        from distutils.ccompiler import CompileError, LinkError
        self._check_compiler()
        try:
            src, obj, exe = self._link(body, headers, include_dirs,
                                       libraries, library_dirs, lang)
            self.spawn([exe])
            ok = True
        except (CompileError, LinkError, DistutilsExecError):
            ok = False

log.info(ok and "success!" or "failure.")
        self._clean()
        return ok

# -- High-level methods --------------------------------------------
    # (these are the ones that are actually likely to be useful
    # when implementing a real-world config command!)

def check_func(self, func, headers=None, include_dirs=None,
                   libraries=None, library_dirs=None, decl=0, call=0):
        """Determine if function 'func' is available by constructing a
        source file that refers to 'func', and compiles and links it.
        If everything succeeds, returns true; otherwise returns false.

The constructed source file starts out by including the header
        files listed in 'headers'.  If 'decl' is true, it then declares
        'func' (as "int func()"); you probably shouldn't supply 'headers'
        and set 'decl' true in the same call, or you might get errors about
        a conflicting declarations for 'func'.  Finally, the constructed
        'main()' function either references 'func' or (if 'call' is true)
        calls it.  'libraries' and 'library_dirs' are used when
        linking.
        """
        self._check_compiler()
        body = []
        if decl:
            body.append("int %s ();" % func)
        body.append("int main () {")
        if call:
            body.append("  %s();" % func)
        else:
            body.append("  %s;" % func)
        body.append("}")
        body = "\n".join(body) + "\n"

return self.try_link(body, headers, include_dirs,
                             libraries, library_dirs)

def check_lib(self, library, library_dirs=None, headers=None,
                  include_dirs=None, other_libraries=[]):
        """Determine if 'library' is available to be linked against,
        without actually checking that any particular symbols are provided
        by it.  'headers' will be used in constructing the source file to
        be compiled, but the only effect of this is to check if all the
        header files listed are available.  Any libraries listed in
        'other_libraries' will be included in the link, in case 'library'
        has symbols that depend on other libraries.
        """
        self._check_compiler()
        return self.try_link("int main (void) { }", headers, include_dirs,
                             [library] + other_libraries, library_dirs)

def check_header(self, header, include_dirs=None, library_dirs=None,
                     lang="c"):
        """Determine if the system header file named by 'header_file'
        exists and can be found by the preprocessor; return true if so,
        false otherwise.
        """
        return self.try_cpp(body="/* No body */", headers=[header],
                            include_dirs=include_dirs)

def dump_file(filename, head=None):
    """Dumps a file content into log.info.

If head is not None, will be dumped before the file content.
    """
    if head is None:
        log.info('%s', filename)
    else:
        log.info(head)
    file = open(filename)
    try:
        log.info(file.read())
    finally:
        file.close()

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2022-11-29 07:08:52
..	dir	-	root/root	0755	2022-11-29 07:08:52
__init__.py	text/plain	799 B	root/root	0644	2021-05-11 08:35:23
bdist.py	text/plain	5.43 KB	root/root	0644	2021-05-11 08:35:23
bdist_dumb.py	text/plain	4.8 KB	root/root	0644	2021-05-11 08:35:23
bdist_msi.py	text/x-script.python	34.75 KB	root/root	0644	2021-05-11 08:35:23
bdist_rpm.py	text/plain	21.03 KB	root/root	0644	2021-05-11 08:35:23
bdist_wininst.py	text/plain	15.83 KB	root/root	0644	2021-05-11 08:35:23
build.py	text/plain	5.63 KB	root/root	0644	2021-05-11 08:35:23
build_clib.py	text/plain	7.83 KB	root/root	0644	2021-05-11 08:35:23
build_ext.py	text/plain	30.91 KB	root/root	0644	2021-05-11 08:35:23
build_py.py	text/plain	16.79 KB	root/root	0644	2021-05-11 08:35:23
build_scripts.py	text/plain	6.09 KB	root/root	0644	2021-05-11 08:35:23
check.py	text/plain	5.5 KB	root/root	0644	2021-05-11 08:35:23
clean.py	text/plain	2.71 KB	root/root	0644	2021-05-11 08:35:23
command_template	text/plain	633 B	root/root	0644	2021-05-11 08:35:23
config.py	text/plain	12.81 KB	root/root	0644	2021-05-11 08:35:23
install.py	text/plain	28.14 KB	root/root	0644	2021-05-11 08:35:23
install_data.py	text/plain	2.76 KB	root/root	0644	2021-05-11 08:35:23
install_egg_info.py	text/plain	3.44 KB	root/root	0644	2021-05-11 08:35:23
install_headers.py	text/plain	1.27 KB	root/root	0644	2021-05-11 08:35:23
install_lib.py	text/plain	8.42 KB	root/root	0644	2021-05-11 08:35:23
install_scripts.py	text/plain	1.97 KB	root/root	0644	2021-05-11 08:35:23
register.py	text/plain	11.44 KB	root/root	0644	2021-05-11 08:35:23
sdist.py	text/plain	18.56 KB	root/root	0644	2021-05-11 08:35:23
upload.py	text/plain	7.42 KB	root/root	0644	2021-05-11 08:35:23

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